The WM_DISPLAYCHANGE message is sent to all windows when the display resolution has changed.
A window receives this message through its WindowProc function.
The new image depth of the display, in bits per pixel.
The low-order word specifies the horizontal resolution of the screen.
The high-order word specifies the vertical resolution of the screen.
This message is only sent to top-level windows. For all other windows it is posted.
Minimum supported client
|Windows 2000 Professional [desktop apps only]|
Minimum supported server
|Windows 2000 Server [desktop apps only]|
Build date: 10/25/2012