Windows program death

Write a WindowsProgramI just used it, and I found myself a little unremembered. So I read the book and write it here for review!

Now, go to the topic. When you want to close a Windows program, you can click the cross symbol or press the close command item in the System menu,

In this way, wm_close is sent. Usually the window function of the program does not intercept this message, so defwindowproc processes it and defwindowproc

After receiving wm_close, call destroywindow to clear the window. Destroywindow itself sends wm_destroy again. The program generally calls postquitmessage to handle wm_destroy. Postquitmessage sends the wm_quit message, so that the getmessage in the message loop can get the wm_quit message from the message queue and end the message loop, so that the windows program is truly dead.