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WM_GETDLGCODE
This message is sent by the dialog box manager to a control window when a
character is pressed within the dialog box. The application should process
this message in the window procedures of any user- defined classes which it
creates. The dialog box manager needs this in order to determine certain
characteristics of a user-defined control, such as whether a user-defined
control can receive the input focus, and whether the user-defined control
"swallows" certain keys.
Parameters
wParam and lParam are not used.
Returns
The window proc should return one or more of the following codes:
DLGC_DEFPUSHBUTTON - default push button
DLGC_HASSETSEL - the control can receive EM_SETSEL messages
DLGC_PUSHBUTTON - the control acts like a push button
DLGC_RADIOBUTTON - the control acts like a radio button
DLGC_WANTALLKEYS - the control wants all WM_CHAR messages
DLGC_WANTARROWS - the control needs the arrow keys (like a listbox)
DLGC_WANTCHARS - the control wants all WM_CHAR messages
DLGC_WANTMESSAGE - the control wants all messages
DLGC_WANTTAB - the control wants the TAB and BACKTAB keys
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