WM_GETDLGCODE
This message is sent to the dialog box procedure associated with a control. Normally, Windows handles all arrow-key and TAB-key input to the control. By responding to the WM_GETDLGCODE message, an application can take control of a particular type of input and process the input itself.
WM_GETDLGCODE wParam = 0;
lParam = (LPARAM)(LPMSG) lpMsg;
- wParam
-
Not used.
- lpMsg
-
NULL if the system is performing a query, or is otherwise a pointer to an MSG structure.
One or more of the values, indicating which type of input the application processes and described in the following table, is returned.
| Value | Description |
|---|---|
|
DLGC_BUTTON |
Button. |
|
DLGC_DEFPUSHBUTTON |
Default push button. |
|
DLGC_HASSETSEL |
EM_SETSEL messages. |
|
DLGC_RADIOBUTTON |
Radio button. |
|
DLGC_STATIC |
Static control. |
|
DLGC_UNDEFPUSHBUTTON |
Non-default 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 in the MSG structure to the 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.