Emulate MFC encapsulation Windows API

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Finally, two buttons were added to handle the click events of each button, and it was supposed to rewrite the OnLButtonDown method in Qbutton, but the button could not be distinguished. Refer to this article:

Http://zhidao.baidu.com/link?url=hsXHcC9q_tfdf4Ztz_juQR4fxY63UU7Ujsj1Tz1rDPKi2xk8JlnzqX4rfCPNyh-SRK-zeIFgECm9H4PuMn4GoK

The WM_COMMAND message is processed in the WindowProc of the button's parent form, and the message's LoWord (WParam) is the ID of the control, which specifies a different response by determining the control's ID for a different button. Reference: http://msdn.microsoft.com/en-us/library/ms647591 (VS.). aspx

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