CGEventTapCreate（）调用的问题 [英] Issue with CGEventTapCreate() call

问题描述

我想使用以下代码注册全局关键事件：

  void function（）
 { 
 CFMachPortRef keyUpEventTap = CGEventTapCreate（kCGHIDEventTap，kCGHeadInsertEventTap，kCGEventTapOptionListenOnly，CGEventMaskBit（kCGEventKeyUp），& keyUpCallback，NULL）; 
 
 
 CFRunLoopSourceRef keyUpRunLoopSourceRef = CFMachPortCreateRunLoopSource（NULL，keyUpEventTap，0）; 
 CFRelease（keyUpEventTap）; 
 
 CFRunLoopAddSource（CFRunLoopGetCurrent（），keyUpRunLoopSourceRef，kCFRunLoopDefaultMode）; 
 CFRelease（keyUpRunLoopSourceRef）; 
} 
  

应用程序在执行CFMachPortCreateRunLoopSource（）调用时崩溃。我认为崩溃是因为CGEventMaskBit（ kCGEventKeyUp ）当我创建一个事件点击。

但是如果我创建事件点击使用 CGEventTapCreate（kCGHIDEventTap，kCGHeadInsertEventTap，kCGEventTapOptionListenOnly，CGEventMaskBit（kCGEventFlagsChanged），& keyUpCallback，NULL），应用程序工作正常。它不会崩溃。我按任何修改键时收到回调。

谢谢，

Dheeraj。

解决方案

我找到此链接上此问题的修复： / p>

http://www.cocoabuilder.com/archive/cocoa/242438-trouble-with-event-taps.html

I'm trying to register for global key events using this code :

void function()
{
    CFMachPortRef keyUpEventTap = CGEventTapCreate(kCGHIDEventTap,kCGHeadInsertEventTap,kCGEventTapOptionListenOnly,CGEventMaskBit(kCGEventKeyUp),&keyUpCallback,NULL);


CFRunLoopSourceRef keyUpRunLoopSourceRef = CFMachPortCreateRunLoopSource(NULL, keyUpEventTap, 0);
    CFRelease(keyUpEventTap);

    CFRunLoopAddSource(CFRunLoopGetCurrent(), keyUpRunLoopSourceRef, kCFRunLoopDefaultMode);
    CFRelease(keyUpRunLoopSourceRef);
}

The application crashes while executing CFMachPortCreateRunLoopSource() call. I think the crash is because of CGEventMaskBit(kCGEventKeyUp) when I create an event tap.

But if I create event tap using CGEventTapCreate(kCGHIDEventTap,kCGHeadInsertEventTap,kCGEventTapOptionListenOnly,CGEventMaskBit(kCGEventFlagsChanged),&keyUpCallback,NULL), the application works fine. It does not crash. I'm getting callbacks when any modifier key is pressed. But I need to get callbacks for delete key pressed.

Any ideas?

Thanks,

Dheeraj.

解决方案

I found the fix for this issue on this link :

http://www.cocoabuilder.com/archive/cocoa/242438-trouble-with-event-taps.html

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