David Ayers a écrit :
Am Freitag, den 20.02.2009, 11:18 +0100 schrieb Xavier Glattard:
** 3. How can I check at runtime if a function is implemented by the
platform backend ?
For example "setValues" is not implemented on win32:
[[self openGLContext] setValues:&swapInterval
forParameter:NSOpenGLCPSwapInterval];
A call to a non-implemented method raises an exception. You may catch
it. As it's only implemented by Apple a compile time check should do the
job. But is this what you need ?
-resondsToSelector: is the canonical run time check.
id ctx = [self openGLContext];
if ([ctx respondsToSelector:@selector(setValues:forParameter:)])
{
[ctx setValues:&swapInterval forParameter:NSOpenGLCPSwapInterval];
}
Cheers,
David
Yes but [setValues:forParameter] is implemented as:
'[self notImplemented]'
So '[respondsToSelector:@selector(setValues:forParameter:)]' will always
return YES, and [setValues:forParameter] always raises an exception.
Regards
- Xavier
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