Question

如何让Dialog响应WM_CHAR消息

Answer 1

为了截获键盘击键的值，需要用到WM_CHAR消息。但在Project中添加该消息后会发现，程序无法响应该消息。即击键后程序并没有执行到该消息对应的函数处。参考MSDN对该消息的描述：This member function is called by the framework to allow your application to handle a Windows message. The parameters passed to your function reflect the parameters received by the framework when the message was received. If you call the base-class implementation of this function, that implementation will use the parameters originally passed with the message and not the parameters you supply to the function. 关键的意思是要执行WM_CHAR消息，程序焦点必须在主窗口上。但不幸的是，程序运行以后，焦点在按钮上。解决的方式是使用PreTranslateMessage消息，进行处理，将焦点设置到主窗口上。具体代码如下：BOOL CTTDlg::PreTranslateMessage(MSG* pMsg){// TODO: Add your specialized code here and/or call the base class if ( pMsg->message == WM_KEYDOWN ||pMsg->message == WM_CHAR){pMsg->hwnd = m_hWnd;