program ends immediately

This is a discussion on program ends immediately within the Windows Programming forums, part of the Platform Specific Boards category; hey, i'm bored and writing a hangman program as my first experience in dealing with images. as of now, the ...

  1. #1
    Shibby willc0de4food's Avatar
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    program ends immediately

    hey, i'm bored and writing a hangman program as my first experience in dealing with images. as of now, the program compiles just fine but when i try to run it, it opens and then immediately closes. i'm using a wm_paint case almost identical to the one used in the Forger's Win32 tutorial over at winprog.net and the program would run just fine until i added the wm_paint case. any ideas why? thanks


    wow...today is not my day.
    i have:
    Code:
     case wm_paint:
    {
        ....
    }
    case wm_close:
        ...
    break;
    ..wowthatsucks. lol break's usually help in switches....
    Last edited by willc0de4food; 09-02-2005 at 10:04 PM.
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    you've placed a break or return at the end of your wm_paint right?

  3. #3
    Shibby willc0de4food's Avatar
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    lol nope. *my bad*

    but for a new question, how do i make the picture go away so theres blank space? and then on a wrong answer, i want to display a new image. do i display the image but accessing the wm_paint case and then have like, a variable that tells which image to use? or is there a better way? thanks
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  4. #4
    C++ Enthusiast jmd15's Avatar
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    I'm assuming you are using bitmaps? If you are a good way to decide which bitmap to use is an array. Like this one for example:
    Code:
    HBITMAP bitmapArray[4];  //assuming you are using 5 bitmaps
    ...    //load each bitmap and store the handle into the array
    ...    //and declare a variable to determine which one to use
    ...    //name the variable bitToUse for the example
    
    case WM_PAINT:
    HDC hdc=BeginPaint(hwnd,&ps);
    HDC hdcMem=CreateCompatibleDC(hdc);
    SelectObject(hdcMem,bitmapArray[bitToUse];
    BitBlt(hdc,x,y,bitWidth,bitHeight,hdcMem,0,0,SRCCOPY);
    DeleteDC(hdcMem);
    EndPaint(hwnd,&ps);
    return 0;
    Some of those parameters to BitBlt are of course variables(x,y,bitWidth,bitHeight).
    Hope that helps
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  5. #5
    Shibby willc0de4food's Avatar
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    but then when i want to change the bitmap, how do i re-call the WM_PAINT case to make it change the bitmap?
    //load each bitmap and store the handle into the array
    what do you mean? or how? lol

    thanks
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  6. #6
    C++ Enthusiast jmd15's Avatar
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    Depends on how you load the bitmap, I usually do it from file so that's the way I will show you. In the resource file I add:
    Code:
    IDB_BITMAP1  BITMAP  "bitmap1.bmp"
    IDB_BITMAP2  BITMAP  "bitmap2.bmp"
    and load them into the array like this:
    Code:
    bitmapArray[0]=LoadBitmap(hInstance,TEXT("IDB_BITMAP1"));
    bitmapArray[1]=LoadBitmap(hInstance,TEXT("IDB_BITMAP2"));
    //load the rest of the bitmaps like this
    And finally for re-calling WM_PAINT do this:
    Code:
    SendMessage(hwnd,WM_PAINT,0,0);
    Any more questions just ask.
    Trinity: "Neo... nobody has ever done this before."
    Neo: "That's why it's going to work."
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  7. #7
    Shibby willc0de4food's Avatar
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    ok, thanks thats how i was loading bitmaps but i'd make an HBITMAP var for all of them, lol


    mm...with a character array, you have to have one extra spot for the NULL char. is there anything similar to this with a bmp array?
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  8. #8
    C++ Enthusiast jmd15's Avatar
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    Not to my knowledge but if you want to be safe, there's no hurt in declaring one extra space in the array. I'm pretty sure you don't NEED one but it's up to you.
    Trinity: "Neo... nobody has ever done this before."
    Neo: "That's why it's going to work."
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  9. #9
    Shibby willc0de4food's Avatar
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    that way of loading bitmaps didn't work. (the LoadBitmap(hInstance, TEXT("ID_PICWHATEVER"));

    but this is how i've been doing it:
    Code:
    bitmapArray[0] = LoadBitmap(GetModuleHandle(NULL), MAKEINTRESOURCE(ID_PICWHATEVER));
      if (bitmapArray[0] == NULL)
        MessageBox(NULL, "Could not load Picwhatever.", "Error", MB_OK | MB_ICONERROR);
    but the pics still aren't changing this is my WM_PAINT case:
    Code:
    case WM_PAINT:
            {
                BITMAP bm;
                PAINTSTRUCT ps;
                
                HDC hdc = BeginPaint(hwnd, &ps);
                
                HDC hdcMem = CreateCompatibleDC(hdc);
                HBITMAP hbmOld = SelectObject(hdcMem, bitmapArray[showBmp]);
                GetObject(bitmapArray[showBmp], sizeof(bm), &bm);
                
                BitBlt(hdc, 14, 13, bm.bmWidth, bm.bmHeight, hdcMem, 0, 0, SRCCOPY);
                
                SelectObject(hdcMem, hbmOld);
                DeleteDC(hdcMem);
                
                EndPaint(hwnd, &ps);
            }
            break;
    i have showBmp declared as an int and initialized to 7; then in an if statement in the check() function, if the guess was incorrect, it does --showBmp; and then SendMessage(hwnd, WM_PAINT, 0, 0); any ideas on what wrong?
    thanks.
    Last edited by willc0de4food; 09-04-2005 at 05:09 PM.
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  10. #10
    Shibby willc0de4food's Avatar
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    hmm...after the --showBmp, if i do
    Code:
    InvalidateRect(hwnd, 0, TRUE);
    then it updates the picture.
    thanks for all your help.
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  11. #11
    C++ Enthusiast jmd15's Avatar
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    No problem, and yes InvalidateRect works too because when you call that function it sends a WM_PAINT message because you are telling it the "rect" is invalid and needs to be repainted. Maybe my way wasn't working because hInstance wasn't declared in that scope? GetModuleHandle returns a HINSTANCE which is hInstance. MAKEINTRESOURCE is only if you define an ID for the bitmap like :
    Code:
     #define IDB_IMAGE4 3000
    I don't know the proper range of integers that bitmaps use I forgot so don't quote me on that part.
    Last edited by jmd15; 09-04-2005 at 06:08 PM.
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    Neo: "That's why it's going to work."
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  12. #12
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    "The WM_PAINT message is generated by the system and should not be sent by an application. "

    Use InvalidateRect() (followed by an UpdateWindow() to bypass the OS que and post directly to the windows callback).
    "Man alone suffers so excruciatingly in the world that he was compelled to invent laughter."
    Friedrich Nietzsche

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