用于对话框窗口，设置消息处理函数的返回值。

DWL_MSGRESULT Sets the return value of a message processed in the dialog box procedure.

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这个成员函数确保每个消息都被处理。

This member function ensures that every message is processed.

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这个成员函数确保每个消息都被处理。

This member function ensures that every message is processed.

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