C++ (Cpp) IImage::GetThumbnail Examples

Example #1

File: Manilla2DConfigThemesDlg.cpp Project: seanpatrickcatlin/manilla2dcustomizer

HBITMAP LoadImageThumbnailWithImagingApi(const CString &strFileName, int imgWid, int imgHei)
{
    IImagingFactory *pImgFactory = NULL;
    IImage *pImage = NULL;
    IImage *pImageThumb = NULL;
    CoInitializeEx(NULL, COINIT_MULTITHREADED);
    HBITMAP hResult = 0;
    if (SUCCEEDED(CoCreateInstance (CLSID_ImagingFactory,
        NULL,
        CLSCTX_INPROC_SERVER,
        IID_IImagingFactory,
        (void **)&pImgFactory)))
    {
        ImageInfo imageInfo;
        if (SUCCEEDED(pImgFactory->CreateImageFromFile(strFileName, &pImage))
            && SUCCEEDED(pImage->GetThumbnail(imgWid, imgHei, &pImageThumb))
            && SUCCEEDED(pImageThumb->GetImageInfo(&imageInfo)))
        {
            CWindowDC dc(0);
            CDC dcBitmap;
            dcBitmap.CreateCompatibleDC(&dc);
            hResult = CreateCompatibleBitmap(dc.GetSafeHdc(), imageInfo.Width, imageInfo.Height);
            if (hResult)
            {
                HGDIOBJ hOldBitmap = dcBitmap.SelectObject(hResult);
                pImage->Draw(dcBitmap.GetSafeHdc(), CRect(0, 0, imageInfo.Width, imageInfo.Height), NULL);
                dcBitmap.SelectObject(hOldBitmap);
            }
            pImageThumb->Release();
            pImage->Release();
        }
        pImgFactory->Release();
    }
    CoUninitialize();

    return hResult;
}