Re: Question about respondsToSelector
Re: Question about respondsToSelector
- Subject: Re: Question about respondsToSelector
- From: "Jonathan del Strother" <email@hidden>
- Date: Tue, 19 Aug 2008 14:55:55 +0100
On Tue, Aug 19, 2008 at 2:33 PM, Carmen Cerino Jr. <email@hidden> wrote:
> 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!
Heya - that's not the entire selector. You want to use :
if ([_delegate respondsToSelector: @selector(SGDecompDataProc:
trackingFlags: displayTime: displayDuration: validTimeFlags:)]) {
...
}
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