WM_GETDLGCODE message

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.

#define WM_GETDLGCODE                   0x0087

wParam

The virtual key, pressed by the user, that prompted Windows to issue this notification. The handler must selectively handle these keys. For instance, the handler might accept and process VK_RETURN but delegate VK_TAB to the owner window. For a list of values, see Virtual-Key Codes.

lParam

A pointer to an MSG structure (or NULL if the system is performing a query).

The return value is one or more of the following values, indicating which type of input the application processes.

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.

Reference

DefWindowProc

EM_SETSEL

MSG

WM_CHAR

Conceptual

Dialog Boxes