WM_GETDLGCODE

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 
wParam;                // not used 
pMsg = (LPMSG) lParam; // pointer to an MSG structure

Parameters

pMsg: The value of lParam is NULL if the system is performing a query, or lParam is a pointer to an MSG structure.

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	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.

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.

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