thanks a lot for the answer, Jens
but that how my problem began :-)
from creating my own NSAutoreleasePool
here is my code
NSAutoreleasePool *pool = [[NSAutoreleasePool alloc] init];
NSString *nsFontName = [NSString stringWithCString:fontName
encoding:NSMacOSRomanStringEncoding];
NSString *textString = [NSString stringWithCString:"Hello
From Cocoa" encoding:NSMacOSRomanStringEncoding];
NSPoint p = NSMakePoint(qdX, qdY);
NSGraphicsContext *oldContext = [NSGraphicsContext
currentContext];
NSGraphicsContext *context = [NSGraphicsContext
graphicsContextWithGraphicsPort:cgContext flipped:TRUE];
[NSGraphicsContext setCurrentContext : context];
NSColor *cocoaColor = [NSColor colorWithCalibratedRed:r
green:g blue:b alpha:alpha];
NSFont *font = [NSFont fontWithName:nsFontName size:fontSize];
NSMutableDictionary *stringAttributes = [NSMutableDictionary
dictionaryWithCapacity:4];
[stringAttributes setObject:font forKey:NSFontAttributeName];
[stringAttributes setObject:cocoaColor
forKey:NSForegroundColorAttributeName];
[textString drawAtPoint:p withAttributes:stringAttributes];
[NSGraphicsContext setCurrentContext : oldContext];
[stringAttributes release];
[font release];
[cocoaColor release];
[context release];
[textString release];
[nsFontName release];
[pool release];
and application crashes with the stack
(gdb) bt 10
#0 0x91a156e8 in objc_msgSend ()
#1 0x94108fdf in NSPopAutoreleasePool ()
#2 0x10a033d6 in Cocoa_DrawText (color=0xbfffebf6,
fontName=0x10a38604 "Times New Roman Bold", fontSize=24, qdX=38,
qdY=50, text=0x10a385f8 "Hello World", alpha=1) at ....../models/
AcDc/../../../models/AcDc/src/acdc/acdc.cpp:1691
#3 0x10a034b2 in CAcdc::DoUpdate (this=0xe661760) at ....../models/
AcDc/../../../models/AcDc/src/acdc/acdc.cpp:1724
#4 0x10a09f22 in CAcdc::ReadData (this=0xe661760) at ....../
that's how I started to look at it
also I'm not sure I have to release all of those objects, like
cocoaColor, font e.t.c.
I became suspicious when
NSString *nsFontName = [NSString stringWithCString:fontName
encoding:NSMacOSRomanStringEncoding];
didn't complain about absence of the pool (if I didn't create my own)
Note: our main application isn't linked against Cocoa framework at all
it linked against CoreFoundation, QuickTime, Carbon, CoreServices,
ApplicationServices frameworks
our application uses 10.4 SDK
and as far as I can see none of those frameworks (in 10.4u.sdk) don't
use Foundation or AppKit
however our bundle linked against Cocoa framework
thanks
On Apr 3, 2008, at 8:47 PM, Jens Alfke wrote:
On 3 Apr '08, at 5:07 PM, Robert Claeson wrote:
The default autorelease pool is created in the <project name>.m
file of a newly created project. If you have messed around too much
with that file, you might have deleted it.
There's not a "default" autorelease pool. They form a stack, and get
pushed and popped dynamically.
It's true that the very outermost pool on the main thread is created
in main(); but hopefully nothing your app is doing dynamically will
end up using that pool, because objects autoreleased into it will
hang around until the app quits.
But usually when your app code is running, it's responding to events
or timers or other actions under the control of the runloop, so the
topmost autorelease pool is a temporary one created by the runloop
for the duration of that call (and cleaned up as soon as your code
returns.)
To answer the original question: I don't think you can tell whether
there's an autorelease pool active. But it doesn't matter: if you're
doing anything that could autorelease objects, and there might not
be a pool already, create your own by calling [NSAutoreleasePool
new] beforehand and [pool drain] afterwards.
—Jens
Dmitry Markman
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