WM_CTLCOLORDLG

  • Article

This message is sent to a dialog box before Windows draws the dialog box. By responding to this message, the dialog box can set its text and background colors by using the given display device context handle. The DefWindowProc function selects the default system colors for the dialog box.

WM_CTLCOLORDLG hdcDlg = (HDC) wParam; 
  hwndDlg = (HWND) lParam;

Parameters

  • hdcDlg
    Handle to the device context for the dialog box
  • hwndDlg
    Handle to the dialog box

Return Values

If an application processes this message, it must return the handle of a brush. The system uses the brush to paint the background of the dialog box.

  • Default Action
    The DefWindowProc function selects the default system colors for the dialog box.

Remarks

The system does not automatically destroy the returned brush. It is the application's responsibility to destroy the brush when it is no longer needed.

The WM_CTLCOLORDLG message is never sent between threads. It is sent only within one thread.

Note that the WM_CTLCOLORDLG message is sent to the dialog box itself; all of the other WM_CTLCOLOR* messages are sent to the owner of the control.

If a dialog box procedure handles this message, it should cast the desired return value to a BOOL and return the value directly. If the dialog box procedure returns FALSE, then default message handling is performed. The DWL_MSGRESULT value set by the SetWindowLong function is ignored.

Requirements

OS Versions: Windows CE 1.0 and later.
Header: Winuser.h.

See Also

DefWindowProc | SetWindowLong | Dialog Boxes Messages

Last updated on Wednesday, April 13, 2005

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