How to Get and Process Control Messages in MFC, such as cbutton onmousemove

Please first understand the concepts of the following superclasses and subclasses. In MFC, in addition to subclassdlgitem, there are also subclasswindow functions used to execute the same functions. After associating with a control ID, all messages of the control will have this class to respond. Generally, the process is as follows: 1. A class is derived from the control that wants subclass, for example, cedit-> cmyedit; 2. messages to be processed, such as onchar, are completed in cmyedit; 3. Define the member variable m_myedit of the cmyedit class in the dialog box class; 4. Add m_myedit (idc_edit, this) to the oninitdialog of the dialog; in this way, when onchar occurs on idc_edit, the onchar in cmyedit will be called.