Thread: Displaying a Bitmap

  1. #1
    Registered User
    Join Date
    Jan 2003

    Displaying a Bitmap

    Ok, I have an MFC application with all my interface laid out. I have a CStatic control which I extended into the VideoProcessor class. I have a HBITMAP which I want to display. Now lets pretend, this HBITMAP is an image file (which in reality it isn't). In the OnPaint() function, I want to display this image.

    I've spent 2 days trying to figure this out. I've read tutorial after tutorial, tried code chunk by code chunk. I can draw lines using the CPaintDC class but I can't BitBlt! I've tried to draw it on the parent form's paint event but with no luck either.

    Here's my initialization:
    videoBox.Create("", WS_CHILD | WS_VISIBLE | SS_BLACKFRAME, CRect(40, 40, 200, 160), this);
    Note: I've also tried SS_BITMAP instead of SS_BLACKFRAME.

    afx_msg void VideoProcessor::OnPaint()
       CPaintDC paint(this);
       HBITMAP bmp = ... ;
       int width = 160, height = 120;
       // draw bitmap here
    Please help, I can't believe I'm having so much trouble on such a trivial thing. No wonder people prefer C# or VB. But I *need* to draw this bitmap, asap! Thanks.

  2. #2
    Registered User Codeplug's Avatar
    Join Date
    Mar 2003
    You should try to understand the tutuorials/references, instead of copy-n-pasting chunks of code from them.

    Here is the OnPaint() of the attached code:
        // our paint DC
        CPaintDC dc(this);
        // load up our bitmap into bmME
        CBitmap cbmME;
        // for resources use:
        //    cbmME.LoadBitmap(IDB_BITMAP_ME);
        // for files use this:
        HBITMAP hBmp = (HBITMAP)::LoadImage(NULL, "avatar.bmp", IMAGE_BITMAP,
                                            0, 0, LR_LOADFROMFILE | LR_CREATEDIBSECTION);
        if (hBmp == NULL)
            TRACE0("::LoadImage('avator.bmp') failed");
        // use our hidden static frame for bitmap placement
        CRect framerect;
        // create a memory DC
        CDC dcMem;
        // select the bitmap into the memory dc
        CBitmap *old = dcMem.SelectObject(&cbmME);
        // get the raw bitmap for access to its attributes
        BITMAP bm;
        // blit it
                  bm.bmWidth, bm.bmHeight, 
                  &dcMem, 0, 0, SRCCOPY);

  3. #3
    Registered User
    Join Date
    Jan 2003
    Wow, thanks so much! I was reading tutorials but I couldn't figure out what was wrong. I think its because I was getting the DC of the screen or something. Thanks for the code!

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