Re: function pointer in Cocoa
Re: function pointer in Cocoa
- Subject: Re: function pointer in Cocoa
- From: "Louis C. Sacha" <email@hidden>
- Date: Thu, 3 Jun 2004 09:29:02 -0700
Hello...
Is this something like what you wanted to do?
- - - file: yourFunction.h - - -
#include <CoreAudio/CoreAudio.h>
extern OSStatus yourIOProc (AudioDeviceID inDevice, const
AudioTimeStamp* inNow, const AudioBufferList* inInputData, const
AudioTimeStamp* inInputTime, AudioBufferList* outOutputData, const
AudioTimeStamp* inOutputTime, void* inClientData);
- - - end: yourFunction.h - - -
- - - file: yourFunction.c - - -
#include "yourFunction.h"
OSStatus yourIOProc (AudioDeviceID inDevice, const AudioTimeStamp*
inNow, const AudioBufferList* inInputData, const AudioTimeStamp*
inInputTime, AudioBufferList* outOutputData, const AudioTimeStamp*
inOutputTime, void* inClientData)
{
/* ... your function code here ... */
}
- - - end: yourFunction.c - - -
- - - file: SoundCard.h - - -
#import <Cocoa/Cocoa.h>
#import <CoreAudio/CoreAudio.h>
/* ... */
@interface SoundCard: NSObject
{
/* ... */
AudioDeviceIOProc customIOProc;
}
/* ... */
@end
- - - end: SoundCard.h - - -
- - - file: SoundCard.m - - -
#import "SoundCard.h"
#import "yourFunction.h"
/* ... */
@implementation SoundCard
- (id)init
{
if ((self = [super init]))
{
/* ... */
customIOProc = yourIOProc;
}
return self;
}
/* ... */
@end
- - - end: SoundCard.m - - -
Hi, there,
Is there anyone having experience using function pointer in Cocoa? I
am currently developing an application for my experiment using OSX's
CoreAudio. In particular, there is a function AudioDeviceStart,
which calls a C-type function pointer (*AudioDeviceIOProc). To
utilize this function, I create a class called "SoundCard" (I want
fully control of the soundcard, Revolution 7.1). The question I
have is, how to handle this function pointer? Can I declare it as
the instance variable of "SoundCard" class? If so, how and where to
define the function? Since the function needs to be implemented in
C? I could make the program working if I put the definition of the
C-function in the SoundCard.m file. However, it is really ugly. Any
idea?
Ding
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