A problem with a modal dialog box

This is a discussion on A problem with a modal dialog box within the Windows Programming forums, part of the Platform Specific Boards category; Hi guys. I'm having a problem with a modal dialog box. The procedure of the dialog is declared in GameEngine ...

  1. #1
    "Why use dynamic memory?"
    Join Date
    Aug 2006
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    186

    A problem with a modal dialog box

    Hi guys. I'm having a problem with a modal dialog box.
    The procedure of the dialog is declared in GameEngine class as so :
    Code:
    private:
       //Modal dialog box window procedure. Enables the player to select a color
       //after throwing either wild or wild four
       BOOL CALLBACK ColorSelector(HWND hDlg, UINT msg, WPARAM wParam, LPARAM lParam);
    when I call it through GameEngine class like so:
    Code:
    DialogBox(m_AppInst, "Color Selector", m_Wnd, ColorSelector);

    i get this error:
    error C3867: 'GameEngine::ColorSelector': function call missing argument list; use '&GameEngine::ColorSelector' to create a pointer to member

    The fourth parameter is a pointer to the dialog box procedure, isn't it??
    how come?

    I did what the compiler suggested: &GameEngine::ColorSelector, but i got this error:
    error C2664: 'DialogBoxParamA' : cannot convert parameter 4 from 'BOOL (__stdcall GameEngine::* )(HWND,UINT,WPARAM,LPARAM)' to 'DLGPROC'

    any one can help ?
    "C makes it easy to shoot yourself in the foot; C++ makes it harder, but when you do, it blows away your whole leg."-Bjarne Stroustrup
    Nearing the end of finishing my 2D card game! I have to work on its 'manifesto' though <_<

  2. #2
    Kernel hacker
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    Farncombe, Surrey, England
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    That's because your callback is a member function of your class - you can not do that, it has to be a free or static function [that is, it must be a function that doesn't expect a hidden "this" pointer passed along to the function]. You would need to find some other way to inform the function which object you are working on.

    --
    Mats
    Compilers can produce warnings - make the compiler programmers happy: Use them!
    Please don't PM me for help - and no, I don't do help over instant messengers.

  3. #3
    "Why use dynamic memory?"
    Join Date
    Aug 2006
    Posts
    186
    i thought of another idea, yet simpler for choosing a color. I will just put some rectangles for the user to click then determine the color

    thanks for your reply
    "C makes it easy to shoot yourself in the foot; C++ makes it harder, but when you do, it blows away your whole leg."-Bjarne Stroustrup
    Nearing the end of finishing my 2D card game! I have to work on its 'manifesto' though <_<

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