WM_CTLCOLORMSGBOX
The
WM_CTLCOLORMSGBOX message is sent to the owner window of a message box before
Windows draws the message box. By responding to this message, the owner window
can set the text and background colors of the message box by using the given
display device context handle.
WM_CTLCOLORMSGBOX
hdcMB = (HDC) wParam; // handle of message box display context
hwndMB = (HWND) lParam; // handle of message box
Parameters
hdcMB
Value of wParam.
Identifies the device context for the message box.
hwndMB
Value of lParam.
Identifies the message box.
Return Values
If an application
processes this message, it must return the handle of a brush. Windows uses the
brush to paint the background of the message box.
Default Action
The DefWindowProc
function selects the default system colors for the message box.
Remarks
The WM_CTLCOLORMSGBOX
message is never sent between threads. It is sent only within one thread.
See Also