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Beginner Problem - first OpenGL instruction causes Exception

Hi,

I'm a beginner with both OpenGL and Cocoa, and after playing around with demo code I tried to build my first application from scratch. I subclassed an NSOpenGLView, which is part of an application built in Interface Builder.

The initWithFrame function looks like this (ripped out of demo code):

- (id) initWithFrame:(NSRect)frame {
colorBits = 16;
depthBits = 16;
originalDisplayMode = (NSDictionary *) CGDisplayCurrentMode( kCGDirectMainDisplay );
NSOpenGLPixelFormat *pixelFormat = [ self createPixelFormat:frame ];
if( pixelFormat != nil ) {
self = [super initWithFrame:frame pixelFormat:pixelFormat];
[ pixelFormat release ];
if (self != nil) {
[ [ self openGLContext ] makeCurrentContext ];
glShadeModel( GL_SMOOTH ); // some random OpenGL instruction
}
}
return self;
}

The problem is, I get an EXC_BAD_ACCESS exception as soon as I execute my first OpenGL instruction. (glShadeModel, which I just put there as a test.)
I single-stepped through this code countless times, read through the documentation and compared it to working examples and don't have a clue what I'm doing wrong ! I'm probably missing something obvious...

Thanks,
Jens

P.S.: Crash report:

Date/Time: 2002-12-06 01:46:37 +0000
OS Version: 10.2 (Build 6C115)
Host: Jens-Restemeiers-Computer.local.

Command: MyApp
PID: 14448

Exception: EXC_BAD_ACCESS (0x0001)
Codes: KERN_PROTECTION_FAILURE (0x0002) at 0x00000000

Thread 0 Crashed:
#0 0x00000000 in 0x0
#1 0x9316162c in -[NSCustomView nibInstantiate]
#2 0x931b9360 in -[NSIBObjectData instantiateObject:]
#3 0x931b9470 in -[NSIBObjectData nibInstantiateWithOwner:topLevelObjects:]
#4 0x93237fc4 in loadNib
#5 0x93237c7c in +[NSBundle(NSNibLoading) _loadNibFile:nameTable:withZone:ownerBundle:]
#6 0x93237de8 in +[NSBundle(NSNibLoading) loadNibFile:externalNameTable:withZone:]
#7 0x932377f4 in +[NSBundle(NSNibLoading) loadNibNamed:owner:]
#8 0x930d253c in NSApplicationMain
#9 0x00003c60 in main (main.mm:13)
#10 0x000039e4 in _start (crt.c:267)
#11 0x00003864 in start

PPC Thread State:
srr0: 0x00000000 srr1: 0x4200f030 vrsave: 0x00000000
xer: 0x00000000 lr: 0x0006c32c ctr: 0x00000000 mq: 0x00000000
r0: 0x00000000 r1: 0xbffff8e0 r2: 0x8fe4c120 r3: 0x00001d01
r4: 0x01db5450 r5: 0x00000000 r6: 0xbffff728 r7: 0x90980354
r8: 0x00000005 r9: 0x000b3298 r10: 0x00000002 r11: 0xa0004544
r12: 0x00000000 r13: 0x00000000 r14: 0x00000000 r15: 0x00000000
r16: 0x002afbd0 r17: 0xa309799c r18: 0xa309799c r19: 0xa309799c
r20: 0xa309799c r21: 0x00000000 r22: 0xa30993e8 r23: 0xa30a109c
r24: 0xa309fcec r25: 0x002b5830 r26: 0x003d7250 r27: 0x002c9510
r28: 0x000b50cc r29: 0x003da520 r30: 0xbffff8e0 r31: 0x003e8230
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