Based on the dialog box procedure. Button to set up a button, and then set up an...

代码说明：

基于对话框的程序。 设置一个button按钮，然后设置一个事件，button按钮触发这个事件，线程中间响应，并设置了sendmessage-Based on the dialog box procedure. Button to set up a button, and then set up an event, button button to trigger this event, the thread between response and set up a SendMessage