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Simple class for drawing pictures (JPG, TIFF, GIF, etc...)

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17 Jan 2001CPOL 470.9K   14.3K   120   111
This article describes a class called CPicture that uses the IPicture class to draw pictures of almost any type to a CDC.

CPicture.JPG

This article describes a very easy to use class that enables you to draw an image of almost any type to the screen.

Another feature it demonstrates is using the resource to store the images. By using the static function GetResource in another context, you can very easily store Wave-files or document templates in the resource of your application. This example has three images stored in memory: Image 1 is a JPEG image, image 2 is a GIF image and image 3 is a bitmap.

By examining the example, it will be very clear how the class should be used. Below, the most important code is shown.

This example also implements the CMemDC written by Keith Rule to enhance the drawing. (FlickerFree Drawing).

// The function 'LoadFromBuffer' prepares the IPicture class.
// It requires a buffer filled with the contents of an image.

bool CPicture::LoadFromBuffer(BYTE* pBuff, int nSize)
{
    bool bResult = false;

    HGLOBAL hGlobal = GlobalAlloc(GMEM_MOVEABLE, nSize);
    void* pData = GlobalLock(hGlobal);
    memcpy(pData, pBuff, nSize);
    GlobalUnlock(hGlobal);

    IStream* pStream = NULL;

    if (CreateStreamOnHGlobal(hGlobal, TRUE, &pStream) == S_OK)
    {
        HRESULT hr;
        if ((hr = OleLoadPicture(pStream, nSize, FALSE, IID_IPicture,
                                 (LPVOID *)&m_pPicture)) == S_OK)
            bResult = true;

        pStream->Release();
    }

    return bResult;
}
 
// This function draws the picture on the device context

bool CPicture::Draw(CDC* pDC, int x, int y, int cx, int cy)
{
    long hmWidth;
    long hmHeight;
    m_pPicture->get_Width(&hmWidth);
    m_pPicture->get_Height(&hmHeight);

    if (m_pPicture->Render(pDC->m_hDC, x, y, cx, cy, 0, 
                              hmHeight, hmWidth, -hmHeight, NULL) == S_OK)
        return true;

    return false;
}

License

This article, along with any associated source code and files, is licensed under The Code Project Open License (CPOL)


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Comments and Discussions

 
GeneralRe: A few questions/remarks regarding this issue Pin
Chris Losinger20-Jan-01 8:56
professionalChris Losinger20-Jan-01 8:56 
GeneralRe: A few questions/remarks regarding this issue Pin
Colin J Davies21-Jan-01 9:52
Colin J Davies21-Jan-01 9:52 
GeneralRe: Again.. no GIF without a Unisys License Pin
21-Jan-01 0:31
suss21-Jan-01 0:31 
GeneralRe: Again.. no GIF without a Unisys License Pin
22-Jan-01 14:02
suss22-Jan-01 14:02 
GeneralRe: Again.. no GIF without a Unisys License Pin
22-Jan-01 14:13
suss22-Jan-01 14:13 
QuestionHow to creating Half size bitmap from any Bitmap?? Pin
19-Jan-01 3:10
suss19-Jan-01 3:10 
AnswerRe: How to creating Half size bitmap from any Bitmap?? Pin
PeterHarrie19-Jan-01 3:31
PeterHarrie19-Jan-01 3:31 
AnswerRe: How to creating Half size bitmap from any Bitmap?? Pin
Skarrin25-Jan-01 2:30
Skarrin25-Jan-01 2:30 
This should work: get a handle to the bitmap (m_pPicture->get_Handle()) and then use CopyImage() to duplicate the handle while changing it's size. See CopyImage and IPicture doc in MSDN for details.

HTH, Jens
QuestionWhat about animated GIF's Pin
Remon Spekreijse18-Jan-01 23:30
Remon Spekreijse18-Jan-01 23:30 
AnswerRe: What about animated GIF's Pin
PeterHarrie18-Jan-01 23:38
PeterHarrie18-Jan-01 23:38 
GeneralThe source is here: Pin
Skarrin25-Jan-01 2:26
Skarrin25-Jan-01 2:26 

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