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      • vb.net教程之何謂子類化(subclassing)

      • 2015-01-24 13:18 來源:未知
      何謂子類化(subclassing(相關vb.net教程)
      眾所周知,Windows是一個基于消息的系統,消息在Windows的對象之間進行著傳遞。子類化和Windows的鉤子機制存在于消息系統之中,我們可以利用這些機制來操縱、修改甚至丟棄那些在操作系統或是進程中傳遞的消息,以求改變系統的一些行為。子類化技術用來截取窗口或控件之間的消息,當然是消息在到達目的窗口之前完成的操作。這些被截獲的消息既可以保留也可以修改它們的狀態,之后就繼續發送到目的地。子類化技術實現了一些正常情況下無法實現的功能,試想鼠標右鍵單擊TextBox,系統默認彈出Undo、Cut、Copy、Paste等菜單,我們就可以利用子類化技術來改變這個系統菜單。
      簡單的說,子類化就是創建一個新的窗口消息處理過程,并將其插入到原先的默認窗口消息處理過程之前。
      子類化分為三類:實例子類化(instance subclassing)—從窗口或控件的單一實例截獲消息,這種子類化技術最普遍;全局子類化(global subclassing)—能夠截獲從相同的窗口類創建出來的多個窗口或控件的消息;超類化(superclassing)—和全局子類化很類似,區別在于可以應用在新的窗口類上面。
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