How to set a dialog invisible in VC++?

#1 Well, you'll need to know the handle to the window. Once you know that just use:

ShowWindow(hwnd, SW_HIDE);

hwnd is the handle to the window, and SW_HIDE is a macro telling ShowWindow what to do, in this case hiding the dialog.

The other macros you can send to ShowWindow include SW_MINIMIZE, SW_MAXIMIZE, and SW_RESTORE.

You'll then need to invalidate the window rectangle area with this call:

InvalidateRect(hwnd, NULL, 1);

This essentially tells windows that particular coordinates of the window need to be redrawn since they no longer exist and we need to update the screen.