Owner-Display Format

For a clipboard owner that does not use any of the common standard clipboard formats, an alternative to providing a display format is to use the owner-display (CF_OWNERDISPLAY) clipboard format.

By using the owner-display format, a clipboard owner can avoid the overhead of rendering data in an additional format by taking direct control over painting the clipboard viewer window. The clipboard viewer window sends messages to the clipboard owner whenever a portion of the window must be repainted or when the window is scrolled or resized.