objective-c – C函数可以用作Cocoa中的选择器吗？

我想使用C函数启动一个新线程,而不是使用Objective-C方法.我试过了

[NSThread detachNewThreadSelector: @selector(func) toTarget: nil withObject: id(data)];

我在哪里

void func(void *data) {
   // ...
}

和data是一个void *,但我在objc_msgSend中遇到运行时崩溃,调用来自

-[NSThread initWithTarget:selector:object:]

我该怎么做？它甚至可能吗？

@R_502_323@

滚动你自己：

// In some .h file.  #import to make the extension methods 'visible' to your code.
@interface NSThread (FunctionExtension)
+(void)detachNewThreadByCallingFunction:(void (*)(void *))function data:(void *)data;
-(id)initWithFunction:(void (*)(void *))function data:(void *)data;
@end
 
// In some .m file.
@implementation NSThread (FunctionExtension)
 
+(void)startBackgroundThreadUsingFunction:(id)object
{
  NSAutoreleasePool *pool = [[NSAutoreleasePool alloc] init];
 
  void (*startThreadFunction)(void *) = (void (*)(void *))[[object objectForKey:@"function"] pointerValue];
  void *startThreadData               = (void *)          [[object objectForKey:@"data"] pointerValue];
 
  if(startThreadFunction != NULL) { startThreadFunction(startThreadData); }
 
  [pool release];
  pool = NULL;
}
 
+(void)detachNewThreadByCallingFunction:(void (*)(void *))function data:(void *)data
{
  [[[[NSThread alloc] initWithFunction:function data:data] autorelease] start];
}
 
-(id)initWithFunction:(void (*)(void *))function data:(void *)data
{
  return([self initWithTarget:[NSThread class] selector:@selector(startBackgroundThreadUsingFunction:) object:[NSDictionary dictionaryWithObjectsAndKeys:[NSValue valueWithPointer:function],@"function",[NSValue valueWithPointer:data],@"data",NULL]]);
}
 
@end

注意：我写了上面的代码,并将其放在公共领域. (有时律师喜欢这种东西)它也完全没有经过考验！

你可以随时删除NSAutoreleasePool位,如果你可以保证线程入口函数也创建一个…但它是无害的,没有任何速度惩罚,并使调用任意C函数更简单.我会说保持它在那里.

你可以像这样使用它：

void bgThreadFunction(void *data)
{
  NSLog(@"bgThreadFunction STARTING!! Data: %p",data);
}
 
-(void)someMethod
{
  // init and then start later...
  NSThread *bgThread = [[[NSThread alloc] initWithFunction:bgThreadFunction data:(void *)0xdeadbeef] autorelease];
  // ... assume other code/stuff here.
  [bgThread start];
 
  // Or,use the all in one convenience method.
  [NSThread detachNewThreadByCallingFunction:bgThreadFunction data:(void *)0xcafebabe];
}

运行时：

2009-08-30 22:21:12.529 test[64146:1303] bgThreadFunction STARTING!! Data: 0xdeadbeef
2009-08-30 22:21:12.529 test[64146:2903] bgThreadFunction STARTING!! Data: 0xcafebabe

objective-c – C函数可以用作Cocoa中的选择器吗？

@R_502_323@

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