Bitmap not showing

This is a discussion on Bitmap not showing within the Windows Programming forums, part of the Platform Specific Boards category; This is a method of showing a bitmap i have tried before but this time it doesn't work main.cpp Code: ...

  1. #1
    yes, I'm registered!!! algi's Avatar
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    Ipswich
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    Bitmap not showing

    This is a method of showing a bitmap i have tried before but this time it doesn't work

    main.cpp
    Code:
    #include <windows.h>
    #include <string.h>
    #include <stdio.h>
    
    /*  Declare Windows procedure  */
    LRESULT CALLBACK WindowProcedure (HWND, UINT, WPARAM, LPARAM);
    
    /*  Make the class name into a global variable  */
    char szClassName[ ] = "Kazalio Studios Games";
    HINSTANCE hInst;
    HBITMAP hBit1;
    
    int WINAPI WinMain (HINSTANCE hThisInstance,
                        HINSTANCE hPrevInstance,
                        LPSTR lpszArgument,
                        int nFunsterStil)
    
    {
        HWND hwnd;               /* This is the handle for our window */
        MSG messages;            /* Here messages to the application are saved */
        WNDCLASSEX wincl;        /* Data structure for the windowclass */
    
        /* The Window structure */
        wincl.hInstance = hThisInstance;
        wincl.lpszClassName = szClassName;
        wincl.lpfnWndProc = WindowProcedure;      /* This function is called by windows */
        wincl.style = CS_DBLCLKS;                 /* Catch double-clicks */
        wincl.cbSize = sizeof (WNDCLASSEX);
    
        /* Use default icon and mouse-pointer */
        wincl.hIcon = LoadIcon (hThisInstance, "DogSim2Icon");
        wincl.hIconSm = LoadIcon (hThisInstance, "DogSim2Icon");
        wincl.hCursor = LoadCursor (hThisInstance, "DogSim2Cursor");
        wincl.lpszMenuName = NULL;                 /* No menu */
        wincl.cbClsExtra = 0;                      /* No extra bytes after the window class */
        wincl.cbWndExtra = 0;                      /* structure or the window instance */
        /* Use Windows's default color as the background of the window */
        wincl.hbrBackground = (HBRUSH) GetStockObject (WHITE_BRUSH);
    
        /* Register the window class, and if it fails quit the program */
        if (!RegisterClassEx (&wincl))
            return 0;
    
        /* The class is registered, let's create the program*/
        hwnd = CreateWindowEx (
               0,                   /* Extended possibilites for variation */
               szClassName,         /* Classname */
               "Dog Simulator 2 - Kazalio Studios Games",       /* Title Text */
               WS_OVERLAPPEDWINDOW, /* default window */
               CW_USEDEFAULT,       /* Windows decides the position */
               CW_USEDEFAULT,       /* where the window ends up on the screen */
               600,                 /* The programs width */
               450,                 /* and height in pixels */
               HWND_DESKTOP,        /* The window is a child-window to desktop */
               NULL,                /* No menu */
               hThisInstance,       /* Program Instance handler */
               NULL                 /* No Window Creation data */
               );
    
        /* Make the window visible on the screen */
        ShowWindow (hwnd, nFunsterStil);
    
        /* Run the message loop. It will run until GetMessage() returns 0 */
        while (GetMessage (&messages, NULL, 0, 0))
        {
            /* Translate virtual-key messages into character messages */
            TranslateMessage(&messages);
            /* Send message to WindowProcedure */
            DispatchMessage(&messages);
        }
    
        /* The program return-value is 0 - The value that PostQuitMessage() gave */
        return messages.wParam;
    }
    
    
    /*  This function is called by the Windows function DispatchMessage()  */
    
    LRESULT CALLBACK WindowProcedure (HWND hwnd, UINT message, WPARAM wParam, LPARAM lParam)
    {
            HDC DC, memDC;
            
        switch (message)                  /* handle the messages */
        {
            case WM_CREATE:
                 hBit1 = LoadBitmap(hInst, "MyBP1");
                 break;
            case WM_PAINT:
                
                DC = GetDC(hwnd);
                memDC = CreateCompatibleDC(DC);
                SelectObject(memDC, hBit1);
                BitBlt (DC, 10, 10, 565, 168,
                        memDC, 0, 0, SRCCOPY);
                ReleaseDC(hwnd, DC);
                DeleteDC(memDC);
                break; 
            case WM_DESTROY:
                 DeleteObject(hBit1);
                PostQuitMessage (0);       /* send a WM_QUIT to the message queue */
                break;
            default:                      /* for messages that we don't deal with */
                return DefWindowProc (hwnd, message, wParam, lParam);
        }
    
        return 0;
    }
    ds2.rc
    Code:
    #include <windows.h>
    
    MyBp1 BITMAP BP.BMP
    I started out with nothing and I still have most of it left.

  2. #2
    erstwhile
    Join Date
    Jan 2002
    Posts
    2,227
    Looks like you haven't stored the application instance in your hInst variable so, when you attempt to LoadBitmap, you get NULL.
    CProgramming FAQ
    Caution: this person may be a carrier of the misinformation virus.

  3. #3
    Registered User
    Join Date
    Jan 2005
    Posts
    847
    Also the wParam of WM_PAINT holds the hdc so you can use that instead of a call to GetDC

  4. #4
    yes, I'm registered!!! algi's Avatar
    Join Date
    Nov 2004
    Location
    Ipswich
    Posts
    161
    oh yes it works now, thanks ken fitlike
    I started out with nothing and I still have most of it left.

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