Re: Question about respondsToSelector
Re: Question about respondsToSelector
- Subject: Re: Question about respondsToSelector
- From: "Carmen Cerino Jr." <email@hidden>
- Date: Tue, 19 Aug 2008 09:33:42 -0400
Sorry about the sketchy details. Basically I have a wrapper class for
the Sequence Grabber, and I want to setup a delegate for the
decompression callback.
This is where I use the respondsToSelector method:
static void SGVideoDecompTrackingCallback(
void *decompressionTrackingRefCon,
OSStatus result,
ICMDecompressionTrackingFlags decompressionTrackingFlags,
CVPixelBufferRef pixelBuffer,
TimeValue64 displayTime,
TimeValue64 displayDuration,
ICMValidTimeFlags validTimeFlags,
void *reserved,
void *sourceFrameRefCon )
{
#pragma unused(reserved)
#pragma unused(sourceFrameRefCon)
SGVideo* sgVideoChan = (SGVideo*)decompressionTrackingRefCon;
id _delegate = sgVideoChan.delegate;
if (result == noErr){
if ([_delegate respondsToSelector:
@selector(SGDecompDataProc:)]){
[_delegate SGDecompDataProc:pixelBuffer
trackingFlags:decompressionTrackingFlags
displayTime:displayTime
displayDuration:displayDuration
validTimeFlags:validTimeFlags];
}
}
}
Header file where the function I am checking is prototyped:
@interface VideoController : NSObject {
SeqGrab* mSeqGrab;
SGVideo* mVideoChan;
IBOutlet SampleCIView* mPreview;
}
-(void)SGDecompDataProc: (CVPixelBufferRef)pixelBuffer trackingFlags:
(ICMDecompressionTrackingFlags)decompressionTrackingFlags displayTime:
(TimeValue64)displayTime displayDuration:(TimeValue64)displayDuration
validTimeFlags:(ICMValidTimeFlags)validTimeFlags;
@end
Please let me know if you need to see anything else. Once again I
apologize for the sketchy details.
Thank you all for your help!
Carmen
On Aug 18, 2008, at 4:39 PM, Andy Lee wrote:
Also: note that method names are case-sensitive, so
@selector(doSomething) is not the same as @selector(doSomeThing).
Also, if the method you are referring to takes an argument, make
sure you aren't forgetting the colon at the end. The name of the
method contains all its colons; @selector(doSomething) is different
from @selector(doSomething:).
--Andy
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