Trying to display a bitmap in a dialog.
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Thread: Trying to display a bitmap in a dialog.

  1. #1
    Senior Member
    Join Date
    Jan 2004
    Location
    Hawaii
    Posts
    351

    Question Trying to display a bitmap in a dialog.

    I can't get a bitmap to display in a dialog. I have a DLL that someone else wrote. It's called cards.dll (not the windows one). I also have a header he included, renamed to "defines.h", which defines names for all the cards in the DLL.

    I loaded the DLL in the OnInitDialog() function, but do not understand how to use BitBlt, so I set the HDC crap to NULL for now, hoping someone can both explain this to me, and help me display the bitmap. Also, if there is a better way to go about doing this, explain please, and include source. Keep in mind I do not know VC++ very well, and am learning through trial and error.

    My goal is to create a card simulator. It will display cards, and you can move them, flip them, etc...but there are no rules. This way, you can play any game you want. I have a few quirks to work out in the logic, but I need to get the basics of the code down first.

    Code:
    BOOL CCardsDlg::OnInitDialog()
    {
    	CDialog::OnInitDialog();
    
    	HMODULE hModule = LoadLibrary("Cards.dll"); 
    
    	//LOAD THE BITMAP
    	HBITMAP hBitmpap = 
        LoadBitmap(hModule,MAKEINTRESOURCE(IDB_H01)); 
    	//IDB_H01 IS THE ACE OF HEARTS, WHICH CORRESPONDS TO 4001
    
    
        BitBlt(NULL,0,0,10,10,NULL,0,0,SRCAND);
    
    
    	// Add "About..." menu item to system menu.
    
    	// IDM_ABOUTBOX must be in the system command range.
    	ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX);
    	ASSERT(IDM_ABOUTBOX < 0xF000);
    
    	CMenu* pSysMenu = GetSystemMenu(FALSE);
    	if (pSysMenu != NULL)
    	{
    		CString strAboutMenu;
    		strAboutMenu.LoadString(IDS_ABOUTBOX);
    		if (!strAboutMenu.IsEmpty())
    		{
    			pSysMenu->AppendMenu(MF_SEPARATOR);
    			pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu);
    		}
    
    
    	}
    
    	// Set the icon for this dialog.  The framework does this automatically
    	//  when the application's main window is not a dialog
    	SetIcon(m_hIcon, TRUE);			// Set big icon
    	SetIcon(m_hIcon, FALSE);		// Set small icon
    	
    	// TODO: Add extra initialization here
    	
    	return TRUE;  // return TRUE  unless you set the focus to a control
    }
    A_T
    Geek isn't just a four-letter word; it's a six-figure income.

  2. #2
    Banned
    Join Date
    Jul 2005
    Posts
    511
    Instead of NULL, try using hBitmpap. And use the handle of another bitmap for the second bitmap.

    The BitBlt function performs a bit-block transfer of the color data corresponding to a rectangle of pixels from the specified source device context into a destination device context.

    BOOL BitBlt(
    HDC hdcDest, // handle to destination DC
    int nXDest, // x-coord of destination upper-left corner
    int nYDest, // y-coord of destination upper-left corner
    int nWidth, // width of destination rectangle
    int nHeight, // height of destination rectangle
    HDC hdcSrc, // handle to source DC
    int nXSrc, // x-coordinate of source upper-left corner
    int nYSrc, // y-coordinate of source upper-left corner
    DWORD dwRop // raster operation code
    );

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