The WM_GETDLGCODE 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
Parameters
This message has no parameters.
Return Values
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. |
Default Action
The DefWindowProc function returns zero.
Remarks
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.
See Also