VC tip 1 (to be continued)

1. Obtain the cursor position relative to the parent form in VC

Cpoint P1;
Getcursorpos (& P1 );
Screentoclient (& P1 );

2. How to obtain the form handle based on the control handle

Hwnd getparent (
Hwnd // handle to Child Window
);

3. How to UseProgramOpen a folder

ShellExecute (null, "open", "C: // test", null, null, sw_shownormal );

4. sendmessage and postmessage

Sendmessage is a synchronous function and will not be returned until the window processing is complete.
Postmessage is an asynchronous function that returns a message immediately after it is attached to the Message Queue. A window message will not be discarded because it may fail to respond due to synchronization.