CODEWITHSUNDEEP
c++opencvwinapibitmapgdi+
DNS_Jeezus
DNS_Jeezus

Reputation: 309

Why won't my Gdiplus::Bitmap save a file

I am new to using GDI+ and I'm doing a proof of concept for a personal project of mine.

For this code segment, I essentially want to convert a cv::Mat into a bitmap and save the file to an arbitrary path.

My conversion process is adapted from this StackOverflow answer:

How to convert an opencv mat image to gdi bitmap

My problem is that when I call bitmap.Save(), it returns an error code of 2 (InvalidParameter).

I don't understand why one or more of my input parameters is wrong.

cv::Mat initialization

cv::Mat mat = cv::Mat::ones(768, 1366, CV_8UC3);
show_image_from_mat(mat);

The show_image_from_mat function

int show_image_from_mat(cv::Mat image) 
{
    cv::Size size = image.size();
    GdiplusStartupInput gdiplusStartupInput;
    ULONG_PTR           gdiplusToken;
    // Initialize GDI+.
    printf("================================================================");
    printf("\n%i StarupStatus ",GdiplusStartup(&gdiplusToken, &gdiplusStartupInput, NULL));
    // gdiplus
    Gdiplus::Bitmap bitmap(size.width, size.height, image.step1(), PixelFormat24bppRGB, image.data);
    CLSID bmpClsid;
    printf("\n%p result", CLSIDFromString(L"{557cf400-1a04-11d3-9a73-0000f81ef32e}",&bmpClsid));
    printf("\n%p clsid", bmpClsid);
    const WCHAR* filename = L"C:\\output.bmp";
    char shortfilename[15];//You will need to malloc if you need to handle arbitrary filenames.

    printf("\n%i ErrorCode",bitmap.Save(filename, &bmpClsid,NULL));
    wcstombs(shortfilename, filename, 15);
    show_image_from_file(shortfilename);
    GdiplusShutdown(gdiplusToken);
    return 9001;
}

I got the CLSID abomination from Does GDI+ have standard image encoder CLSIDs?.

And I am writing this in Visual Studio (I'm also new to this).

If the image doesn't load, my output is this:

image

Upvotes: 1

Views: 1487

Answers (1)

DNS_Jeezus
DNS_Jeezus

Reputation: 309

The answer was a combination of all of your answers. one of my octets was wrong in my CLSID, The output path wasn't within reach of the current user. And the input parameters to my Bitmap Constructor required that the Stride parameter(The one I shove image.step1() into) is divisible by 4. The status error code I recieved of 2 was carried over from my Bitmap Constructor

Upvotes: 1

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