WM_GETDLGCODEThe 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.
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_DEFPUSHBUTTON | Default push button |
| DLGC_HASSETSEL | EM_SETSEL messages |
| DLGC_PUSHBUTTON | Push button |
| DLGC_RADIOBUTTON | Radio button |
| DLGC_WANTALLKEYS | All keyboard input |
| DLGC_WANTARROWS | Arrow keys |
| DLGC_WANTCHARS | WM_CHAR messages |
| DLGC_WANTMESSAGE | All keyboard input (the application passes this message on to the control) |
| DLGC_WANTTAB | TAB key |
Although the DefWindowProc function always returns zero in response to the WM_GETDLGCODE message, the window procedures 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.