The WM_GETDLGCODE message is sent to the window procedure associated with a control. By default, the system handles all keyboard input to the control; the system interprets certain types of keyboard input as dialog box navigation keys. To override this default behavior, the control can respond to the WM_GETDLGCODE message to indicate the types of input it wants to process itself.
WM_GETDLGCODE
This message has no parameters.
The return value is one or more of the following values, indicating which type of input the application processes.
|
Value |
Meaning |
|
DLGC_BUTTON |
Button. |
|
DLGC_DEFPUSHBUTTON |
Default push button. |
|
DLGC_HASSETSEL |
EM_SETSEL messages. |
|
DLGC_RADIOBUTTON |
Radio button. |
|
DLGC_STATIC |
Static control. |
|
DLGC_UNDEFPUSHBUTTON |
Nondefault push button. |
|
DLGC_WANTALLKEYS |
All keyboard input. |
|
DLGC_WANTARROWS |
Direction keys. |
|
DLGC_WANTCHARS |
WM_CHAR messages. |
|
DLGC_WANTMESSAGE |
All keyboard input (the application passes this message on to a control). |
|
DLGC_WANTTAB |
TAB key. |
The DefWindowProc function returns zero.
Although the DefWindowProc function always returns zero in response to the WM_GETDLGCODE message, the window procedure for the predefined control classes return a code appropriate for each class.
The WM_GETDLGCODE message and the returned values are useful only with user-defined dialog box controls or standard controls modified by subclassing.