all right hello everybody ah my name is mika
welcome to the first episode of the Joy of Coding is what I'm calling
for now um where I'm going to be like a king on some real sarfoxsbugs
and you can kind of watch me do what I do I'm so there is not
much more preamble than that I'm I think I'm just going to get a to
I'm gonna do this for about an hour and a half and and see how far we get
but I should remind you that none of the suscriptudorplaneii I kind of know what I want to work
bndeabe whether or not its actually going to work out I have no idea thats kind of part of the fun
to watch me yeah get in to to trouble and hopefully get out of trouble again so
well see how it goes right so I am going to face me at secencymorm
my screen hopefully
seeing more of myscrenow um so lets see
here the plan is I want to look at bug one of nine
for three nine ah so thats a amelooktethat first and
well I got a guess will probably take the majority of our time ah
for this episode but if we end up having extra time then theres some things I should probably
to day so we could get to that but this is the bugganinterestedin um
see here yeah this is the idea of the bug at sea was
ah here is a frtwarthewasa
this one printing a calls from the child of the parenishoprogressichoerendile
should not be sink so I will actually that that might just sound like a bunch of gibberish I me
straight the problem so recently relatively recently I got print
king ah ah ah in eatendeswindowselectrolesas windows
m for firefox onlinox I had had it working for windows
like a month or so ago ometimefoigethald aysandisitsworingonosexlinnixswas the last
on patches are currently a pr view but one of the problems is that when
the content process requests that the print dilo
needs to come up mumaritsasokayshow the princeetingstalovsattheusercan
now choose their settings and and say how they want to print something ah that blocks
the content process so let me show you what I mean so this is a neatenasswindow you can tell
that did he as I can I'm getting messages from people as super
or even with seven twenty pe setting apparently you cant
the everything is very blurry a I apologize for the blur hopefully
a dozen rendered this episode completely useless ill try and pump up the fan size
everything if I can but ill talk through what I'm doing a anyways um
any recommendations for how I might be able to improve ah
resolution dropping to hashlivephacking and let me know and a and we can work on
okay so let me demistrythe problem ah if I
bring job from any to this window I then ive got the stop
ok coming up but this dialogue being up has actually blocking the content process meaning
I have another eat of us went over here using the same content process but it is no longer
in any the events its the the content process is completely blocked and
if you wait long off if you block the contemtproses longenif I think something called and its terminator
come round and just like kill the content process so I believe its possible
that if you have this dialogue open long enough your content process will just die
and were thats not great I we dont want to do that what we so
do instead is a make it but the content process is
not blocked or rather here I let me bring up the bug and describe
were thinking as a solution
I will come up the text I'm sorry if this is all blurry people
telling me its blurry and I hope I hope its not unreadable but basically
this is the bog one of nine o four three nine if you want to read up on the history of the bug one
I know for three nine ah what were gonna do our
heres kind of mytentitive plan so let me actually write the so well I'm doing it I like
take notes while working on bugs and so this is a great opportunity to do a and I will write
notes and superbigfitsyyucanseedhemso hopefullyyoucansee
okay I'm the plan of
red is as such I want to make it so that
when the content process request
the dialogue be open we want the
the message a message to go to the parent
to actually open the dialogue but the
age should be a sink instead of sink however we dont like
but the function inseyhulemishurysomecodheremm
that esxcuemeas actually at bringing up these dialogues
yeah thats what happens when were you canceslifprinchofrightnow
as and ah for some reason I just govteryalydirected to
which of I had read it open and it was I finally reacted to my click eventstetswhathavpened
flemesherisancoat um lets see
that all central um
where is it that I want a compon'sprintingand ill pump up the fonsies whatever
to the code I see an ass prank
okay so um and
the ponies when it crank it
to that hopefully thats better okay
um eltgodadmiangodeleatthatumthissis
the proxy on the child processside the contenproseside
heres that somebody wants to open up a a print dialogue so
there is some stuff in her to make sure that a we get a sense of which window
belong to and and like were it were making you recollect enough information that we can tell the parent
what to show how to show it um and to do it properly
dwycerialize a whole bunch of things to go up to the parent and tendecyrialized at whenever comes
and then theres this function ah this method right here I should say
method called senchioprindilogu and this is am is
sinernussowenthis returns ah the parent has dismissed
dialogue because what happens whenever a we shouperindialoges on windows and
I and I think its the case roissecas well is that we actually like the the dial
xpinsittownaventloop its a its a kind of a mortal dialogue that spends its own events
so its blocking um let me show you what I mean so this is the
ah that sat senchoberendoulthat's the method that tells the
a show the printdilog and be responding
ah a printinnparentthere's
a method in her call receive choerindialaugusiswhate
receives it on the parent side and we do a whole bunch of work here to deserealize
so the child sent up and figure at which window were trying to open a ialoaginn
and then we eventually get to this function calledchofrintdilou which tad
see doing the job hoping the dialog in the parent side because I and you probably wanting why are we
doing all this work just to show the dialogue on the parents idelienly open it in and the child
and the reason for that is that the a child process does not have the ability to open
dialogue it doesnt have the ability to end motaldialoguesitreallyhesthe only thing I can
control is whats with in the content the web content thats a deliberate choice
and so whenever we need to do things like a mock about with the browser
crown or open windows or something you have to talk to the parent order to do it
thats a intentional and I think its a its a good security
terestigaoneofthe things that we want to be able to do eventually is to sandbox the content process to prove
from doing a any sort of communication direct communication with like the
ring system or the pilesystem and to go directly through the parent for most
things um we haven't we have a really weak sand box for windows prepared but we
don'tave any other sand box and just yet the thats a goal for some point we want to see
as the contemprusess anyways uh I got distracted so there is this functionerechowpri
dialogue that actually shows the dialogue and this is also
id of singernesswhen I say sinernas I mean like its its a blocking
method call so that whenever we get to hear when were insuring success of the return value
checking return value the dialog has been closed and
thats because the dialogue is a but in the noniestonesscase
blocking other windows from trot from processing and the reason were doing as because the dialog
spinning the eve and used a venlopsowreblocking the main of it loop but its been
estedofvanluopnondnessteodaevedlopsare generally a bad idea but I mean I
as a kind of a another level of complexity things um
but in this case its its been working for us its the only solution
I think I am for this particular problem ah so were going to go
spending in a vantlop so like her in me let me get my solution ran out here
now that you know that stuff when the controvrserequestofdthedolarbyvnewanta parent actually open a dog
the mestershtolbeacingetstolofsink the child should then spin
love and these of enlod
and a to do
apparently the font size still needs to be larger
hmm thats what can do a
that I max it my fate side I can try and maxitdot even
this is crazy I wont be able to function if its a if if its much larger than
like that thats about as maxes its going to get I dont know
has anything else we can deuda to improve the size of things
oh hopefully you can read my nose as well if this does end up working
like this I should point out havent really like ive been doing these pilots on you to live
and a lower the resolution as someone in irsy
resolution I really hope this doesnt end up being like a a um
a deep but my resolution or debut my my screen
cash on instead of a accession but lets give it a shot lets see what happens a resolute
so but isscaleet led spring it down some
on mitstryitus
is that better
is let me know in irseeifthasbetteral
was better for now I dont want to waste too much more time so I mean I keep going um
child should spend in a nesiofeatleop and I
wait for a message from the parent ah with
the states of wit
turn value in essolhosaywrhthereturn value of
having opened the printing gilock
so well actually a toenectedovevatlupstas kinda crazy but were in a have a net
eventlopinthe child waiting for a message back from thee ah
missus back from the parent saying that the dialog closed and telling us how it closed meanwhile
apparently it opens the printing dialogue its going to spend in anesttatofvatluop
to actually show the dialogue um thats something that I dont need a write um
the at least for the ulinexversion which is on a most familiar right now
we just use a gdikadialogand we tell it to run and it blocks and spins
and love and ah and I dont really have to to worry about doing it I have to work
but ah writing these spending eventlupany child process and then waiting for
no from the parent so heres the game plan lets try this
just added a little a check boxhopflyo can see that I like to have these like little check
boxes and I ever note so that I know how I am progressing and I can cleaerthings
lestrokingthings off as I a as I proceed so lets lets ratsome
plane down hum the first thing I want to do is make the call to
what was it a so
hard to read a bit harder for you folktereetwower watching him sorry but that
now choprindilalanthcalledtesaneshow
in dialogue he
instead of sink so thats a matter of altering the printing
I pedeeltthat'sgoanibreakawhole bunch of stuff
ah and thats also going to take a little while to it that that idea
a little bit of a challenge to kind of regicg things to be a like
changed some of the like method a definitions and one
cliraionsbutwellseeweregoinntalterthat and then we are going to what
ntepahafter the
here my foniestruckinkinafter
a cominvuldtogetherieveanen forty a fund after
the am message goes to the parents
to open the dialogue spin and eventlo I
and a vhantlope there are a couple of examples of us spinning aside
and parzifgeccoi'lljust find one and andkinerusasattemplet
I should be pretty straightforward the next step after that is we need to wait for a message
apparent lit I havent actually tested whether not this is going to work
I'm pretty sure that because were spinningannestedtafbataluwil still service messages from the parent so like me
is that come in to say hey ah your um
to know that that will totally work id like this that should work the whole I
it evenlepusto allow masters to come in from the pactsowuworgad but what we need to do
is make it so we need add a message listener probably nacsini
I think has to be because coming for the parent and in a sink m me
a message methocawhataveryouanecallit from
and to signal when the dialogue has
close and pass the status
he returned oh say returned rare
um and then what will do it
stash it like whenever the handler for that
age in the child should then
stash those values within
a proxy instance and
I think that will be safe pretty sure that a
I I assume that like if the service were gonna be holding like this state from
one dialogue I think its pretty rare to be opening a whole bunch of printing dialogs all the same time
um is trying to think of is going to be a problem here
ah like suppose I have two windows
and perontdilogusind both and I canceone and then cancel
the or if I cancsebotetathe same time the messages will come
in a particular order nested of at loop
so ive I'veskipedtastep here ah passtreturnedvaluethe
the very important step as knowing how to escape the nesodeventlope um
have the
a proxy noticed that
he aint message from parent
and sent and egxitannasitof had live now a little bit worried
as I just thought about this its an edge case but we do have to worry about the case like this is were
tlbugscancomeinif you just assume that a user is ollganna ave a single printdilogu
and I mean invariably we have like what have a billion users on fire
or somebodys going to have mutableprintdiloges open at some point um
what a hangaseannickinliehackingsi
shighverydbodysorrydustjoingdtlashinwhii sthevidyoresolutionsaloweven at ashtymaxon
settings out on my side I dont know I
wish this were looking better for you people all trylouring my resolution yet again
all ill bring it down one more notch I dont know
if there is anything else I can do on my end
I mean just try one or two more things hold on to trying
I have ive pumped up the fat so much is becoming kind of unusable
um maybe theres something in my settings to
a video besqualityamsentingthe best cow best resolution
ill try best resolution
okay so hopefully this is better of
you can see this hopefully you can see this um
I dont think theyre okay imelssas its better great
tidieariodum so maybe I can actually
opprtunitytta shrink some this found down then um because its kind of ridiculous
and its its difficult for me to to read my ridsitethamadiineedobealere
plan
okay so
thats the plan of record I'm just thinking now about the problem of multiple print
and how were going to deal with that my
yes
what will happen so it let me think through what happens because I
need of vent love we could end a we could end in a priest
situation where we have like a whole set of nested
like an nestadeevatlobeorruningtimthenes tedievalopewet service a message
parent ah or from sorry from the child that puts us in a nest
lo while were still in that first nesteeevitlioteandthenah we are
kind of in bad shape that doesnt sound great
um at tacolokat what we currently do cause
ah again this the spontsiyesis ridiculous
go to bring it down hopefully now because my resolution is so much hire ah I can do this
out too much as it still to a
oh no thats not one I wanted
no its also not what I want and where was I before profile prifencesyeas
it is what I want okayothiglikethat this is more
like what I used to go gulokiso lets
something and going to I go back to my a instance of firfoxhere
I think I just have the one window and um
to open us in an open up to nanytenaswindos
its a debugbildsotsginatakehemamainevery thing'is gonna be a
oh I do monty that didnt want to resise my viam
I I want to recite the window
cmongripywersthecriptyeandneetamagrippy
I need them agrippywhere come out
lemigrip bank you
so at one and then I want the other
I really apologize about the stream resolution richard is there anything else we can do like
I ive done everything I think I can on my end um
is are a setting I can do and video that I havent thought of to help in creimprove the resolution
I'm in a play with a little bit from the hand and am
any wants on the stream if it falls just to a paid refresh little
to be I may have to interrupt it to get some of these changes to take in any of that
recording and were making is higher resolution and so when we post a recording it should
pray nicsrecharbrihardnelesska everybody
the guys atom okay so what I wanted to test was what happens whenever we have
a print a dialogues sees me open in
a note tess like do we allow that it looks like we do
so this is running in us to do an love this is also running in us to do in love
and we seem to be okay with that
its just a matter madbeitsjust a matter of remembering
some unique characteristic like what I'm worried about
is accidentally in this case of having multiple windows being opened
I'm having me returned values from the window the confused
two different instances of ah the dialogs being open
at something I'm a little something in word but I dont actually know whether or not
its worth worrying about but it is something that my in my spiersensesortingling
so maybe we should think about that for a little bit
um but let me finish writing out what I was riding at handle for that message in choldge
satle'sdviys within the proxy instance and when the event
o exits um
these values should be returned to the original call
right because there is somebody on
child side that said show me the print dialogue and that speak
turdthalookboutsthe collar that we need to be sending this information too that we gathered
from the pan process at the end
so I mean I kind of stew on this whole handling the
multiple dialogue window case as in the mean time I can deaf
I do this first bit lets do that right now which
close steepbagbilld
zemeossasa looks great so richard wraveyour doing
it lets its its working so thank you
so what I want to do here I want to alter
closprintineipechepintingipeda
um to chain
an so these two there is actually to theres like
this show progress um
show progress method that also sink I'm actually going to work
this one and then keep this one in the back of my head hopefully that the solution that I come
this can be generalized in such a way that other duplicate a too much code
and so that for the show progress case as well because the show progress is used at like pretty
chiedately after you start a print job firefoxwill show a progress like a little window comes up
and it shows you like how progresses proceeding in terms of
tracing the layodandtendandblasing ogtiorprinter um
fun fact fun fact I found out there s a cancelbutonon that progress dialogue
that canclbuton straight up does not work it has an not wore in years
apparently and theres a but on that but if you ever start a print job and firefox and like can
a lot in a castle that some like if you can let in the
still I should say thats a a surprising result I filodthebaggonit I will hope
so once I am I am once I am
done with the stuff okay so lets make shoprindilogue
a sin that easy I can do that um
ecllyasanithink it might be that easy I think it changes
no I think it might just be that easy shoperndowleyea
lets lets see how much she too and I oh
so this was something I was sitting before um if you
but this crash o was sitting out this is what I was wrestling with lasttweek this crash
is actually an assertion failure because of something thats going on in cairo ah
and this is something that I will see every time
hutdownmygtebugbuild um after having open the printing dialogue
and thats just the way its been since like firefox for or maybe in longer although
someone says oh I think I dont remember who said in in the bagreyfile about it but
it might be that I just have an out of a version of cairo are the cirolibraries on my system or
or maybe its two new version of the car liveries basically a its not a big
so dont worry but the fact of him crashing on a rash down tryanignoredthat
I'm out do
so lets lets try and build what I just did
I am a keep doing it with the debugandirllednow
changed hemsmypedeelahavetorbuild this directory ips I pedal
its kind of ludothere's like this adiwansavodobutr
multiple levels of things that you need to rebuild onaveyouchangeanipedatpressur eoneofthemth
I see I be and I think you also want to build the directory
o of directories of anything thats like consuming that I pedal
some sense so I gave you that and I say do what I do
cause it all kind of talks so we that bill
lets think about this so that is
progress spinning in a annestidevetluple t'sactuallygettatsanothereasy
I do right away ah I a reset my
one is there and lets find nestedofvetluops pretty sure of seen as before
where did I see it I think I saw them like anosezulwindow
if you notice I must
exireinstad of emmaxire its the best inmitenon
again mister a a loop think I did it and my god to
level window creep top of all cretewinocreakcromwindow
on top of a window is ive seen it whenever I was dealing with like new
no stuff so ah here it is
and as process next event this is a spinning in a vent
m lat'sitsfi
another example
he asked globlwendow
I see yeah and as process next even
ill we we we call we create a while loop while
some condition is true we call anasprostess next event we passed some arguments to it
I'm not sure what those arguments do I should probably find out so
I am to the definition I pass
thread and may wait it may we
mainweihtbanywaietomewaitprosess nextdeventmanwei
we may this some documentation on this iconryet
yes
he and fried
oh no thats just a stack
sunralatid
mm hmm
hmm well I dont actually know what I
to a may wait all that I mean I as a theadowith waiting clearly
m in the context of spinning the eventlope
um but I dont actually know whether
he waited
curious I need a now the stuff I nedoknowieaudoknow okay
process next to vent well
I define process next to me
find the definition I think thats not her
its on a the red is that at its on a thread
process next event it is a method on a thread a thread
as I thread so
as is nexttavanharyaperioab
nfrander that of true indicates of the method may block a calling thread twas
even right process an extent
no pending events than the smith may wait the pendingonevaleuthemeiwyprandter
tell if an event is dispatchedthesreadthasmethodis reentrangfor may only be called if the thread is the
red re entrance so maybe my nestedevetle
said so bad umipliamprameterth
true indicates that the method may block the calling thread to wait for a pending event
oh I understand um I guess that doesnt really matter if
while love because were just gentikeep calling this thing um
and I and
think it matters if what other people do
and as what was a ennesprosessnexttofen
where other people tend to be
these true some people dont even pass a thing
some people say false shes a m
this is me cargocallding or trying to ah
do people do this some people dont pass anything may be that something
can be addressed in coerviewal take a note
to do find out if I I
in the event live with and as
process next event where there are not leave want to pass true
falls for a man weight gain
we dont forget whats next twistnextsanalleahad
has this finish building I freaked out so a singoness message
returned ales right so I screwed up I screwed up people
um thats what its all about showing you how I
so this a sink method to not return
stuff that is not what we want to be able to like it doesnt make any sense and a sink
ah doesnt get a return value it doesnt get any information from the parent right away
so we need to a
suffout the modified setting though thats like what we want to get back once the
dialogue closes on the parent light there there will be a
um a way to contact the child to say like
but come and I will call it um
I I dont know
naming hard especially in public
the press seas
pretty bad umnolpeplasto
right cuobordasthene
I am I put that there for now
I myself but I will commentedoand there
this thing is now on returning values ah thats going to break
other things how my fee the bits of cold where we
say deal with the stuff that those that message returned
ah but we will get there we will get there
I really hope the quality is has improved for people
um I apologize if you been like looking forward to this and its just a
vlarymessand maybe a robot voice hopefully
worsescasecenariojust come back and watch the recorded stream when this is all done
muliatlike a perfectly htescreen scream perfectly he street
um everything will be hundory so worse cat
are come back later when the stream has been uploaded as a recorded video
ah okay so while were waiting for that to build and fail cause I'm certain this is going to fail
pretty certain I am highly certain
these are warnings that we ignore I have a feeling is going to fail
inalintingstage
and oh I'm so that
a kind a done but now we need to
alter
alter and as printing printing
prompt serve this proxy so that it
expect return values from sanshowprintdil
I wish I could draw a free people
which I could like show you a piece of paper
as he had an drawthis out a ms theyre like a drawing to win her
I think so pictures
a picture of a drawing that I take a hi'lljusttryandescri
so and I can describe what I'm thinking
but I'm probably going to change it as I go like I said I'm in a thinking on my feet here I'm thinking of
ytsingtomyvants so I'm let me just think a loud here
and he to alter the printing service proxy pretty pronpterhis proito so doesnt expect
yes from senschoprndiloguebutimediatelye astartstospininesto
love right that makes
ads and then the parent once the dialog close
and a message to the child saying here are the modified settings that these are
up in the dialogue heres this um that actually
well I mean if these are cancels out of the dialogue were still sevingtamessagho
chiltoyeggsoftheumthenesedofvatlope I guess will return
states code for the for the dialagugaeit and
potentially modified settings am as possible that the setting'sworet changed that these just cant
I just had okay and thats fine and I think that
he owe did fail told jack
and that was not unexpected
heres crawling up in vibe
I care its complaining because
hi
seveshaperndialogue right right because it yeah
its expecting um
he was hit
ritual bull was hit on is just a warning
if its probably related forspedyacare
caatpolcadeanabtrtofbatsrectybe printing parent because
yathers something I havent implemented one of the functions properly changed the function
signature and it exists inside the like
the haters and stuff that I be as librarysspitsoutbut I havent inplomen
to properly but I will get there
I will get there so after
turndinisecondambutididnwanlwaseioeetran pfathere so
what I want to find out was whats the information that we sent back de
a morfihdsangs sucsass
I think in this case we care about the
the status code
were kind of endanger here if the no no
I dont know if the parent dies or speinginesadafvantlope
the main threat is not blocked would here about the parent dying we would
down the process or a gay okay
art
so
thats all to the codes that doesnt expect values wait
and before we can take I really wanted finally I want to like feel good about the
my worry is that a printing dialogue on the parents
closes we sent a message down to the child which states it into the printing service proxy
proxy service is the message to receive the message
to to receive or settingsadsatesinsaidtheprocy and then immediately
send those values to the collar
if two windows were open at the same time what would happen if two
like say closed at the same time the user has somehow magically hit
okay on both windows its not going to happen at exactly the same time but very close together what will happen
I dont think there is a race here or is there race here try to fit a rate
people um my get says that there might be a rat
her feels racy um
tiancal close dialogabllclotse valogubell close
dialogue a because its um
whichever one is on the hats interest
mister deventlo
which every one close as first will be the one to send the message to the child
mesgestafsentin order
second dilog closes and other message comes in saying I'm done
the vested to doublenessetofvorlups
the whichever one received
like benesterdaveluthefirstwhantehgadthi nkabautitsthinktingtitingi
which ever on receives
the message first its the same to the problem is that is the same
oxiytheandhisprinting prompter is proxy if the service theres only one of them
entire a child process whereas there
I mean its reentring you might enter the ah that choperndialoginga
times without it having exited because like you have a whole bunch of people pen
enloosoouehadahave turtles all the way down with me
elupsanistryhicuyou service a message saying of got result
that loop
which live which wovply
deep it loop is the one that will service the message
a true
oh boy um
I guess I just have to build it and find out like I'm I'm worried about stuff
actually be a problem and trying to like simulate it in my brain and of having a
our time um multiple messed of that lubesircausing
baindamout so lets just try building it ah
and screit lets see what happens but I gonna take note down
I mean a taken note to make sure and investigate
potentiality for race conditions
with mothpole dialogue windows closing
mpomnestedoventlopes and setting
being dispatched to the wrong color
okay
no taken so we will get there
lets go back to what we were doing before why is this not building
how is the problem so I'vecopleofwaysasslutiontoatrilleal
a couple ways as solving this ah clearly I'm not implementing something properly
am ive changed the signature by changing from since he had to sink
I know exactly remember with that means in terms of the names of methods
but am a crepe on playing pryfastenlose with methods and function
I guess that thats me being kind of half a javasfripdeveloperindha
fseeplusspostevolprnow
or whats looking here
I'm and what did I call it it was shoprindo
gshowpraindiala
no choverindialoguprin prince diealo
received chifrind dialogue should return
in and what are we doing we are plans
you I I see printtanparentthat
ah yeah okay that
the problem we are always supposed to take settings
was passed these like pointers that it was supposed to fill with its return values which
cant do any more because we cant return result singrnesly any more thats the problem
am I in a see printingmparentassee
shofrdialogueyeahdownher
these two values returned value in success
doesnt make any sense any more so where you go
oh this is not on me
censtomymoresucphessiclsfawls
we vows another thing that I had mocked about with
but for
lets just get rid of these for now
um and say like this is
ah the child has been spinningnd
ive who waiting to hear back
to her results here bout
we return the results
message which frees the child
as from its used a eli
ilidadthatkindofdocumentation more for myself as I'm working on something
my checedou before I finally put up a patch but that helps me figure out where things are
and what whats going to happen so um
that might build now
oh you know it no its not going to because the other end of the pipe um en
fawsprintingiesenousprintingispromtservi ceproxcythisthingis
really is very much expecting to
be able to get modified settings back
so
for now it so
now the waiting game
parent process should be showing
printing dialogue soon in the mean time we need to spend
I rested a banealope
while we wait for her
so the dialave to be returned to us
so thats where will spend it and then well get like
a success and modified setting stuff back from that message um but
no its just have success ah this will be false by the fault but
return failure ah and a sarafarefailure so I think I fankthissubuil
its not a work but I its gonna build there is a difference be
piling and working like if it compiles um
thougt'suninitializedyea
I think itd be false to false the worry about it
I just want to make sure that I'm on the right track here I want to like
the very first step is making sure it builds in my mind am and then I work on correct
is but just getting it so that I can test the correctness thats I mean that seems obvious
it is obvious
while thats doing its thing alterswodisrespexpectrturn
is okay spinninginestedevenloesowetsthatlookl
I started to it I found some example code we are looking at it earlier it looks like this
like wow something
something you do and its process
next event then you pass it
put this tisfellaspassingknowlandwithtat
so that I mean
be balled um if not thread
as the current read of a makesense
okay
so say a pointer use the current thread
I should probably I shouldnt be ever
the main thread whenever this runs
I should be safe okay he and his process nexteventinwhataoido true false
tufalseidnnowispersonalrehereded true I dont know what the difference is really
I went in
we were in an event loop here its going to keep hitting it like
they are not we block forecintheseiiresinapassdtrouofornow
thats what I saw here I dont know if its right but
I will actually figure it whether or not the right thing whenever I get on the stuff later
so thats what its going to look like he built
successfullthotworddempt so now its about spending in a bentloop
so this is where we spend money we go wow
something some
and asked process next
and all pointerandtruesa
this is in a break um
lets just do an experiment
as us maksurehat the child process
continues to like well end up fee print dialogue
we should end up still showing the prondilagandtapparent were not going to react properly to whatever results
its but I am pretty sure that be with this code um
and after you know I my as ages do while true
pretty sure that the content process
continued to am like allow me to scroll and separate windows and stuff
with his cod lets testthanypofices so and pilledaga
I have made changes not to the ideal but to this folder soil built here
and link that to what happens
sinking linings good
I was lincoln then linking go
thinking about drinking some water I
but a bump
dont fall while I wait for that so
spendinostadveli
we made this work its bullied but its working sorry for cursing
um like it some I the stupid loop that will never as it but
something
we have to add an asingmastafromftapparento signal when the dialog
to close and then passtereturnvaluestwe' rgrntobeattingsomethingneuetoheipedal at I had said before
now is a great time horewaydfor the stalk were done okay great sweekendustus
so the task case that the testing scenario is
open a print dialogue have two ettauswindosopen open a
ialogin one and make sure that we can stroll in the other if that works
I am
again scantikea couple
seconds for the browser to start up because a deepbugbuild
so second etenusweowcomanright
ill go to read it I so my optu
for me to plug a I read it on read it called watch people code
um thisses where you can find a whole bunch of st
as a people free like live streaming um you dont have to be a read it like
ohtocratean account but there is some useful a useful links to streams
that are going on if you are interested in this stuff and I'm guessing you are if youre watching me code
estednthestuffsofalgymy test case for scrowlingaiamanopen crontol
of rent and he
I could go get you get so were doing the right thing we are doing the right thing
I I
actually work out we had better at out of wood and on
ah
epa fail asters
so ron so haled because the
I still pro is still spending the evently that is happening
can tumpboffwenosso the child is still it is stuck in its even
I could do this like at a bunch of times and ill have this like
her a may be all it
it might not be a so why would we be showing this
thats curious
showing this printerarrosomeprinting from sialteisnotcurentlyavelle
okay I'm curious lets find out so
very given air message in echo and you dont know it where it came from her life what I tend to do I
for the string the string somewhere I used the exireumtolcforthe string her
p are not available thats the key for the string
ah lets find out where thats used ah
okay so it I think it seen as before though I its not
I'm not actually seeing it being used I'm seeing the definition but that is very mysterious
my not seeing a ah why am I not seeing it being act
used in a dialogue and I have a feeling its because we would you like some metros
short cuts and stuff as print vengenedancibubevan
her yeayeahyeahmakrowriderinteforerror
label so what was it
not available the hard out veil
not a valeblefrhirornotvillso we must have got
not all
and who fires that empseforeronotvailwon
and its error not available thats what we
fired as her not available
but not available
so not too many results whats the under pending
lets oogunder which it no
ah all right
well I use the debugaur cause I'm really curious I dont know why were showing
dialogue I know were still spittingthatiggestedavatlutdthatiy have something to do with it
I will quit I will attach you to be or to find out um
why were
I will come in
thank you
go down I am your control see you and like
five seconds for three two
yeah
if were in an as to the ventlopwand we die um maybe
sad I thats bad news
okay so lets to run and again the same undoing
s j d v to figure how we got
that her message cause I'm curious we have a mystery and I'm I'm curious now so
current mystery why did we show
from where did we fire as ron
bailawall when attempting to print again after
ingandteredthenastadofvenlopein the child
thats the mystery
I guess we are really neat
secondonno oh okay so I
print and then cancel a man we should be an a
so I love ah the child that seat for
said
I attach the method we want is
ah in an we asked prince
and
so for an arodilelog
break as pranenjaneshowpraynerrdialou
at great points at
tom
why why why why why
as doctomatviewere
called print on line three six six eight
and as doctouminviewerwhereisthatwher
as toccarherit'sunderladfaceslaefaceands tack
can veer walhoslinethreesixsuxces
if we are printing another you
tenegastattheresentlyhthakheres because this method can be called while another is still in her the pretty
his could exam for the only time the comprnty more than one job at time is the regression tests
ah
so if we attempted in the shade of print job
or more already printing we fail out
and yet as all open up a second print
g earlier today in notetteneswindowsswitswhe
o yet his printingprinti'spnt
mm
hmm
esrahtebatdownfir
a there is coming from and is printengin
no no no as pretention and as document viewer print
um
it is copies
or he lets ron
sevrdnowtwould copy the formatting
a car
curious to know why a I was able to get need
two printing dialogues ah for nantyconeswendows
so a thing to idrectiate how come we can get to
dialogues in two windows going up and none
t is but
any ties I had the us errornonofvellwle
problem okay
for that for later on tikonlet'snotgonistracted
we have twentithinkamanikeepstreaming for another twenty five minutes herself
m were actually making pretty good progress ah the next
step I dont think were at it all the way done thats not
typically like bad bad be incredible if I got this completed and like a pat
by the by one of the streaming session but were actually making a pretty decent headway here
except as to add an acting message from the parent so comes from the parent its handled by the child
the signal the dilunhasbeenclosed and a pass the return value
and that
we get well check for that stuff in here so
see this is going to like send something
I dont know what its going to send um
by
so a unused like
n a chosen printsedings
in one and chosen printsettingssa
n print dialogue results there
results result
we call result sanprintdilohu resulveimgena pass in
ah well what was I doing before
as returning
and success
f in sand be
result
and the cigrinlased
ada and options we show the print
log
so here ah okaylcacaherandas
resultladialoue result equals
shuprindirloge we dont want to insure success here
um but
diet resolved so in a pass back the dialogue resulted
the matter while we go as it might be air it might be because why are you like clothes
I'm pretty sure theres cod in her that explained it am as print
dialogue service was a is called printing prompt
so is priingnpromptserviceisone
like a unixtpttinpromperis
a dialogue print
eric and then you call show pro dialogue show
I wait to die
dohalonstutil
srihdher
oh this is using the
sort of back up the zoo dialoguha we can show it for some reason we cant get a head on the
naive dialog window so carltominson was telling me about this yesterday
saying like theres in this printing code there is like so much history so much croft in
to herself we don't no ones done a really good job of figuring out what is
use what still needs to be supported there is a lot like I was really old cold in her
I think the example I used to as like printincoadeis like busting into a
a shack in the woods and fighting shad carpet on the ground in a discoball and dusk
breverytayngindthere's a fridge its still getting power but he
in a fragesslikedthelandtattime for god I had smells really bad
thats kind of with the printingcoat'slike am anyway
but I digress so print dialoguars thats what I care about ansihprintdialogues
servisrimdialoguserviceantslikeoveracove rengineredlike crazy
um theres so many inner faces I guess thats kind of em
prinpyprompseroisbatisisg
facueriwassopedilon show
what implements this show
jump to definition shows
pddoligservicsshowefrindialg anyway this is what I want
so you I and as erroboardifthesarindicadodnotoproceed so like we return
we only return and a okay if the user head okay and chose some things
he actually returned something that does not qualify as an ex and as sue
ah if these are like cancletoutorhidax on the window or something on the prince
saonsowe have counter that case here so thats what were gathering with dialogue result
at it we dont make sure that its successful um because we still wants end the result
to send that result back to the the child and so we say
sandprintdilahdresulthavenwllpassd result tassel do
a maybe dial
a dialog harvey
now called tholadarveobenusing result to many times here
amingtarrdumla'stothat
so now we have to alter the ideal ambettingcopons printing new
you are
and what was I going to call this a its called
it sir in a sings method called
a print dialogue results
and we pass actually changed the order things were not passing balls
any more were passing
m ah heres the heres the other thing we
I have to return we cant just like return true and
this function the child is waiting we have to we have to get here
um
so we cant do our old trick of returning true in case something goes horribly wrong
we have to return result of the child
so maybe
so and success success meeting that like we got to the point where we were even able to shop
the dialogue um I guess may be icuvincotthadin
error like a as are failure or something
how did
he is
yeah
hmm
mm hmm
ah heres what I'm thinking about
I want to make it so that I dont have to like call a sand
love result every time I normally would have bailed out with like a return true returned true
it to me doesnt sound very good so what I might
and doing is creating some utility function
return to me a result
that I can pack like a dial
or that I can use
and a result that I can pack away does that make sense
sotmakecents
the atmaksenseadingamakense so
oh lets create helperfunctionisprint
parent um show
in dialogue and it will take
be the pros or parent
parent and hen caused print
data date and then it will also return
pointer who also take a pointer for for data result
the spell printing
I think that I work answered to find a bit
I think what all out of doing is calling like
show friend dialogue parent tea
and ill have like a ring on tad
at as resolved
dilogarveclosshmsithinkatl
and then no matter what if any of the screws up
we called this
yes
something like that I think thats whats gonna look
a what'strihetsomginesscowpalthes uff
to me that last bit at the end here
okay domed over here
while down here to meet this copy of stuff
I am printilousodo we had everything we need
I think so yes
returned I anytilike if not peas are failure
aeraterinerandenisarishere instead
yes sure success
um
as the tycerilization the act
showing of the heres where we actually to this pit
here we dont actually have to um and sure success because I
said before it might be
it may be a like the import case
pasentyresalts
save me
arhyclosechoprondialogue
mm
so if are
to be one or two things as okay I brush
I made I should as sure success
I should do a olrturnteaboard a hand
we wont try and serialize back
and as prodlyocar
thinghat's probably okay
a guest but I think it might be okay
so thats whats going to go on in the part
after add this so hold on
in so dialogue ourvelat's
a people putting return values in side
p o has resulted
yes they are as result is a thing we can pass back
great as a result are
I
she just call it hervysaiddilaeavy
I need to different now
okay and that will save this and then
we had a helper function to the header
pare and to printinparandthotholas that called
its called shoverendilogue
I will make it a private method
a show print dialogue
tekinofprioerepparent
okay
but see if fact compiles as compile
is half the battle a quick
about this is going to quitcklenliagan'causit'sinside that
crazy nested eventloopwhichthathfekillet
I heard her we go build
so its too twenty ive got about ten minutes to go
there is no way in a problems problems problems
now what there is no way I'm goin to get all this done
if you are interested in continuing to monitor my progress on this particular bug I'm
I'm going to actually drop a comment into this video to a live here I can
I'm able to share my notes I can like put a public link
inside the video page I'm putting a comment in
here is owing to the live
for be gononineoforthreenine
to comment there I just
comment to the video if you feel like refreshing am
or what not you cannot you can see get a link to his nose
so after I'm done like whenever the stream is done I am actually going to go back to my desk and continue doing the stuff
I just wont be thinking it loud and of my thoats getting a little sore but I will continue to hack on the stuff
cmonredormyritmym progresses I go I'm hoping to have a patch by the end of the week
made even by the end of to morrow so we shall see
a meanwhile declaration chopretillawinnotype
I have violated in that is so pro a for nine thirty eight
fortynidan thirty eight
probably never heard of print data that make sense now
I definitely told you to print data decoration with
type oh oh oh oh anyutelletwhat's returning
a rat right right of course
as result
bill bill billed stilldentligetspitslouitbat
errorsmet's good am sent print dialogue resolve was not
so the scope okay thats good we um its freaking out because it
I recognize this thing and thats not unexpected because I dont rebuild
those other directories the things so
see what it thinks about that
hmm so it doesn't I might have to do the its
its a little out of order I have to maybe build the ic ipiyell directory
first ah and thats also going carrot
but then I build the embettingcompodensp rintingingnewiipesefoller
a match should work so its a theres kind of a chicken and egg problem with
changing iptyalfilesand and having the ah the headers ready for
to link to and to like importdeeryoursource
um but we do we can
yes
I am calling the series the Joy of Coding because
bob ross I dont know if you um a familiar with bobrosswherebertuningin
from if you dont know who he is I recommend you check it out if youre interested in oil
in he is quite good at it ah he was the late baroshewasquie
at it he werelanting thats surprising I didnt in would get that far
it might error out on lincoln but well see anyway if youre enetanoil
ingcheckebabrasah hes got a very sootingvoisetesaysthingsa
to a pain o happy tree here in the corner happy trees as for a little clap
there is a happy little cloud is a I aspired
as calm and cool as bob rose so maybe a ill get there
I am nothing to mention
men for distebildis ah if you are interested in this
liecoatingstuff I I linkdoitbypointeditout before but there is this like
so read it the sereadit on red it called
people code where you can watch a whole bud
people coating stuff a people building games doing stuff with a
well its greattasmelfivestufftmispersons doingseffitflask
um theres theres some really so
colsefenhere um yes so if youre if youre the
I I recmetterthere'shalso the watchpeoplecodotcalm which aggregates
a bunch of these videos and put them on to a single patient can watch them as pretty cool
I didnt like it didnt link properly that was expected
so now I will build again and I think
be more oh you know what it might not like the fact
theres no one on the childs side respond to that message that I'm sending am
that might be a problem womans printing
if ye see in his printingpromptsirviceproxcy
so this is who listens on the child side
I put it right after choprintdialogu
in which is this one
its like a a
thing roxy
receive prantdialou results I guess
is giant get and as result our v and
what it is is or can I get
tltareygannagatcaun
printedadenaathink something like that
thats not for and very nicely but thats because it was that
churthrusiamaomwayutsidethe lines here but
whatever
um sky of his function here os returned
and I am going to define it
I bettingposprintingdipseandmisprintingo mie
I oh I think I to do virtual
um
pitualbollwecallit received praindialou
resolved and its results are
has printtatededta
to go further than I thought with the liking
I have a feeling its still get a flip out it because like there is no way like
theres no way its going to accept the fact that there is nothing on the child side to receive that message
very surprised at it accepted that those conditions
yes
what I liked it unbelievable
well lets build in my implementation of that function anyways I have no idea what
bill properly um maybe there is like a default
warning virtual bull I added something
causing a warning was hidden
actually what I should do
you know I as a final test what I will do is I will make this due I'lldi something really can
m now you know its fine I wont I wont change the code
attached the burger to this method I will make sure that this receives the message even though were
and hats the deventlipeandthen I think were in pretty good shape am
that I am going to call it on this stream
oh I know I had to kill it before as cause I
the under attached
in ink listen
I kind of wish navy would say stuff what
in the linkingpasnavdewoadporitanfa
hmm
I'm almost done
ah before I like
this may or may not work I dont want to I am not even if this doesnt work if like I had
a debuggeriateteidon'tanethe breakpoint and they all kind of
part and stillgoinntocaptelezteremhereumatawa
ive either succeedeturfaildandinshowingthat and I am going to
can I am but a if you liked what youve been watching comment
o um I dont know if anyones actually there a couple of people the irs
hi I dont know if any was actually watching the stuff let me know if its interesting lemmenofthere's others stuff
cover or maybe tips on what I can do maybe some ideas and how can up
the the screen resolution more I have no idea I'm but
just to let me know what you want to see if you want to meet it
I am particular eternessbug I'm these are all I'm working on my trolesthis
fulltime jobs so thats what I'm going to be doing for the next like a bunch of episodes
doing us um so I hope youre into elicturalsis but once I get out of that I
arackingon different bugs like once alectrolesis is more or less ships which
as when I will happen but one that son I I work on mother ah bugsin
we can start expoingtoasas well
what was I going to show I was going to show that no matter what we get that
m our new method called so thats going to be in the child
posessniteneigheforforsoiinkiisstad
a cash the child process
mmhmm
okay
so I will attach to
as printing prompt service proxy what was a called
receive printdialavrslt
a what
or I not attach a amen to
brakebardon'tattach there ah does
flash of course I fat fingered the so the backlash so
oh so the test is whenever I had print
no matter what like if I a cancellouto hear do I have my break point
ah
a crash it looks like a had a mass care
shprild
as I returned false or something well thats a mystery that I mean
solve another time at so I mean a rapid up here if youre interested in
what the heck just happened like a if if youre curious to know why I may have crack
he again check out the notes that are at the bottom of this video in the comments
um because I am going to be keep out all right down the crash
eadnonalritdown explanation of things a myslutionsis
as I go through them ah I am in a cab it off here thank you so much
richard millionsskeforah basically running the show here and halimmeoutwith
solution stuff I really appreciate is how thanks everybody whos watching or will watch
um and yet I hope you all have a great rest of
ray thank you for watching ejoyoccoating I am going to capitherethankyou
like
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