WM_DISPLAYCHANGE message

Applies to: desktop apps only

The WM_DISPLAYCHANGE message is sent to all windows when the display resolution has changed.

A window receives this message through its WindowProc function.

LRESULT CALLBACK WindowProc(
  HWND hwnd, 
  UINT  uMsg, 
  WPARAM wParam, 
  LPARAM lParam   
);

Parameters

wParam

The new image depth of the display, in bits per pixel.

lParam

The low-order word specifies the horizontal resolution of the screen.

The high-order word specifies the vertical resolution of the screen.

Remarks

This message is only sent to top-level windows. For all other windows it is posted.

Requirements

See also

Painting and Drawing Overview

Painting and Drawing Messages

HIWORD

LOWORD

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Build date: 3/7/2012