Subclassing a dialog->Calling DialogProc

This is a discussion on Subclassing a dialog->Calling DialogProc within the Windows Programming forums, part of the Platform Specific Boards category; When I'm subclassing a window created with CreateWindow, i call the WindowProc with CallWindowProc(). I can't seem to find a ...

  1. #1
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    Subclassing a dialog->Calling DialogProc

    When I'm subclassing a window created with CreateWindow, i call the WindowProc with CallWindowProc().
    I can't seem to find a similar function for dialogs(MsVC).

    Is this done in another way in dialogs? I tried to search the board, but found nothing of interest.

  2. #2
    erstwhile
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    A dialog is just a window that is ultimately created by a call to CreateWindowEx so CallWindowProc should be fine for default message processing.
    CProgramming FAQ
    Caution: this person may be a carrier of the misinformation virus.

  3. #3
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    But when i try to call dialogproc, i get a message saying that it's not the right parameter type.

  4. #4
    erstwhile
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    Then cast it. From winuser.h (oct2002psdk):
    Code:
    typedef LRESULT (CALLBACK* WNDPROC)(HWND, UINT, WPARAM, LPARAM);
    
    typedef INT_PTR (CALLBACK* DLGPROC)(HWND, UINT, WPARAM, LPARAM);
    (the INT_PTR return type for dlgproc was previously BOOL).

    And from basetsd.h:
    The INT_PTR is guaranteed to be the same size as a pointer.
    ie on 32bit systems its a 32bit value ie the same as LRESULT.

  5. #5
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    Yes.
    That's the thing to do. I think I'll have to start thinking before i ask...
    Thank you

  6. #6
    Cat without Hat CornedBee's Avatar
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    LRESULT in the new SDK headers is a typedef for INT_PTR too, as is LPARAM. WPARAM is a typedef for UINT_PTR.

    It really gets old now...
    All the buzzt!
    CornedBee

    "There is not now, nor has there ever been, nor will there ever be, any programming language in which it is the least bit difficult to write bad code."
    - Flon's Law

  7. #7
    erstwhile
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    Originally posted by CornedBee
    LRESULT in the new SDK headers is a typedef for INT_PTR too, as is LPARAM. WPARAM is a typedef for UINT_PTR.

    It really gets old now...
    Where would that be then? From windef.h (oct2002psdk):
    Code:
    typedef UINT_PTR            WPARAM;
    typedef LONG_PTR            LPARAM;
    typedef LONG_PTR            LRESULT;

  8. #8
    Cat without Hat CornedBee's Avatar
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    LONG_PTR, INT_PTR, they are the same.
    All the buzzt!
    CornedBee

    "There is not now, nor has there ever been, nor will there ever be, any programming language in which it is the least bit difficult to write bad code."
    - Flon's Law

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