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我有一个可可应用程序，按下某个键会从最前面的应用程序中获取选定的文本并进行处理。现在我想用处理过的文本替换它所选择的内容。我该怎么做？
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http://developer.apple.com/mac/library/documentation/Cocoa/Conceptual/SysServices/Articles/using.html#//apple_ref/doc/uid/20000854-CEGDDHJJ