为最前面的应用程序生成键盘事件 [英] Generate keyboard events for the frontmost application

问题描述

在Mac OS / Cocoa中，我可以以透明的方式合成键盘输入 - 字符串 - 用于最前面的应用程序？

更精确，我不想发送特殊字符或控制序列。我只需要发送标准字符。

刚学习了这里，AppleScript可以这样做：

 告诉应用程序TextEdit
 activate 
 
告诉应用程序系统事件
 keystrokefusing {command down} 
 end tell 
 end tell 
  

问：我该如何使用ObjC / cocoa？ p>

更新2012-02-18 - Nicks提案已增加

基于下面的Nick 的代码，这里是最终的解决方案：

  //首先，获取当前应用程序的PSN 
 ProcessSerialNumber psn; 
 GetFrontProcess（& psn）; 
 
 //做一些关键事件
 CGEventRef keyup，keydown; 
 keydown = CGEventCreateKeyboardEvent（NULL，（CGKeyCode）6，true）; 
 keyup = CGEventCreateKeyboardEvent（NULL，（CGKeyCode）6，false）; 
 
 //将它们转发到最前面的应用程序
 CGEventPostToPSN（& psn，keydown）; 
 CGEventPostToPSN（& psn，keyup）; 
 
 //最后表现为友好
 CFRelease（keydown）; 
 CFRelease（keyup）; 
 

使用此方法，点击非激活面板的按钮将事件定向到实际前应用程序。完全是我想做的。

解决方案

当然，你会想使用CGEventCreateKeyboardEvent来创建键盘事件，例如：

  CGEventRef keyup，keydown; 
 keydown = CGEventCreateKeyboardEvent（NULL，（CGKeyCode）56，true）; 
 keyup = CGEventCreateKeyboardEvent（NULL，（CGKeyCode）56，false）; 
 
 CGEventPost（kCGHIDEventTap，keydown）; 
 CGEventPost（kCGHIDEventTap，keyup）; 
 CFRelease（keydown）; 
 CFRelease（keyup）; 
  

这比AppleScript有点复杂，但它做的伎俩。你必须显式发布一个键下来，然后一个keyup事件。有关详情，请参阅 Quartz Event Services参考。 p>


In Mac OS / Cocoa, may I synthesize keyboard entries - strings - for the frontmost application in a transparent way?

To be more precise, I don't want to send special characters or control sequences. My only need is to send standard characters.

Just learned here, that AppleScript can do the trick like this:

tell application "TextEdit"
    activate

    tell application "System Events"
        keystroke "f" using {command down}
    end tell
end tell

Q: How would I do this using ObjC / cocoa?

UPDATE 2012-02-18 - Nicks proposal enhanced

Based on Nick's code below, here is the final solution:

// First, get the PSN of the currently front app
ProcessSerialNumber psn;
GetFrontProcess( &psn );

// make some key events
CGEventRef keyup, keydown;
keydown = CGEventCreateKeyboardEvent (NULL, (CGKeyCode)6, true);
keyup = CGEventCreateKeyboardEvent (NULL, (CGKeyCode)6, false);

// forward them to the frontmost app
CGEventPostToPSN (&psn, keydown); 
CGEventPostToPSN (&psn, keyup); 

// and finally behave friendly
CFRelease(keydown);
CFRelease(keyup);

Using this method, a click on a button of a non-activating panel targets the event to the actual front application. Perfectly what I want to do.

解决方案

Sure, you'll want to use CGEventCreateKeyboardEvent to create keyboard events, then post them as such:

    CGEventRef keyup, keydown;
    keydown = CGEventCreateKeyboardEvent (NULL, (CGKeyCode)56, true);
    keyup = CGEventCreateKeyboardEvent (NULL, (CGKeyCode)56, false);

    CGEventPost(kCGHIDEventTap, keydown);
    CGEventPost(kCGHIDEventTap, keyup);
    CFRelease(keydown);
    CFRelease(keyup);

It's a bit more complicated than AppleScript but it does the trick. You do have to explicitly post a keydown and then a keyup event. More information at the Quartz Event Services Reference.

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