小编Ton*_*ite的帖子

我收到以下错误:

"Implicit conversion of Objective-C pointer type. Type "void*" requires a bridged cast.

我已经用桥来修复类似的代码 - 但是这些类型的修复在这里没有帮助.这是代码的一部分:

AURenderCallbackStruct input;
input.inputProc = RenderTone;
input.inputProcRefCon = self;
err = AudioUnitSetProperty(
    toneUnit, 
    kAudioUnitProperty_SetRenderCallback, 
    kAudioUnitScope_Input,
    0, 
    &input, 
    sizeof(input));
NSAssert1(err == noErr, @"Error setting callback: %ld", err);

第二个代码位有错误

SStatus result = AudioSessionInitialize(NULL, NULL, ToneInterruptionListener, self);
if (result == kAudioSessionNoError) {
    UInt32 sessionCategory = kAudioSessionCategory_MediaPlayback;
    AudioSessionSetProperty(
        kAudioSessionProperty_AudioCategory,
        sizeof(sessionCategory),
        &sessionCategory);
}

谢谢,提前获得所有帮助.

更新

问题解决了.桥梁铸造工作不正确.应该是:

 input. inputProcRefCon =  (__bridge void*)self 

目前我正试图找到一种平均矩阵的简洁方法.显而易见的解决方案是对矩阵求和,然后除以元素的数量.但是,我在苹果开发者网站上遇到了一种方法,声称可以使用valueForKeyPath以更简单的方式完成此操作.这与以下内容相关联:

http://developer.apple.com/library/ios/#documentation/cocoa/conceptual/KeyValueCoding/Articles/CollectionOperators.html

以下是我正在努力尝试使其工作的示例:

-(void)arrayAverager
{
   NSMutableArray *myArray = [NSMutableArray arrayWithCapacity:25];
   [myArray addObject:[NSNumber numberWithInteger:myValue]];
   NSNumber *averageValue = [myArray valueForKeyPath:@"@avg.self"];
   NSLog(@"avg  = %@", averageValue);

} 

的问题是:代替平均它仅通过1打印出阵列1中的元素阵列.

UPDATE

-(void) pixelAverager

{
    //Put x-coordinate value of all wanted pixels into an array
    NSMutableArray *xCoordinateArray = [NSMutableArray arrayWithCapacity:25];
    [xCoordinateArray addObject:[NSNumber numberWithInteger:xCoordinate]];
    NSLog(@"avg = %@", [xCoordinateArray valueForKeyPath:@"@avg.intValue"]);
 }