Making a media player How to use ESC to launch a full-screen display

zxship

I use the ActiveMovie control to make a simple multimedia player. When I play in full screen, I want to launch the full screen by pressing the ESC key, and return to the original size. Teach my little brother to be a beginner, no one is really depressed.
   In addition, I also want to ask, when I open a video file, the original size of each video file is different. How can I get the original size of the file so that my interface size can be adapted to the file size?

2511718

SendMessage (WM_SYSCOMMAND, SC_RESTORE, 0);