How to load an image byte array into QGraphicsView?

I'm building a module for an application and, this module should take a print from the screen and show it into a QGraphicsView.

This is my Print Screen code that saves the taken photo into a jpg file:

#include <gdiplus.h>

int GetEncoderClsid(const WCHAR* format, CLSID* pClsid) {
    using namespace Gdiplus;
    UINT  num = 0;
    UINT  size = 0;

    ImageCodecInfo* pImageCodecInfo = NULL;

    GetImageEncodersSize(&num, &size);
    if(size == 0)
        return -1; 

    pImageCodecInfo = (ImageCodecInfo*)(malloc(size));
    if(pImageCodecInfo == NULL)
        return -1;

    GetImageEncoders(num, size, pImageCodecInfo);
    for(UINT j = 0; j < num; ++j)
    {
        if( wcscmp(pImageCodecInfo[j].MimeType, format) == 0 )
        {
            *pClsid = pImageCodecInfo[j].Clsid;
            free(pImageCodecInfo);
            return j;
        }    
    }
    free(pImageCodecInfo);
    return 0;
}

void gdiscreen() {
    using namespace Gdiplus;
    IStream* istream;
    HRESULT res = CreateStreamOnHGlobal(NULL, true, &istream);
    GdiplusStartupInput gdiplusStartupInput;
    ULONG_PTR gdiplusToken;
    GdiplusStartup(&gdiplusToken, &gdiplusStartupInput, NULL);
    {
        HDC scrdc, memdc;
        HBITMAP membit;
        scrdc = ::GetDC(0);
        int Height = GetSystemMetrics(SM_CYSCREEN);
        int Width = GetSystemMetrics(SM_CXSCREEN);
        memdc = CreateCompatibleDC(scrdc);
        membit = CreateCompatibleBitmap(scrdc, Width, Height);
        HBITMAP hOldBitmap =(HBITMAP) SelectObject(memdc, membit);
        BitBlt(memdc, 0, 0, Width, Height, scrdc, 0, 0, SRCCOPY);
        
        Gdiplus::Bitmap bitmap(membit, NULL);
        CLSID clsid;
        GetEncoderClsid(L"image/jpeg", &clsid); //Type of image
        bitmap.Save(L"print.jpeg", &clsid, NULL); //Name of the file to save
        bitmap.Save(istream, &clsid, NULL);
        
        delete &clsid;
        DeleteObject(memdc);
        DeleteObject(membit);
        ::ReleaseDC(0,scrdc);
    }
    GdiplusShutdown(gdiplusToken);
    istream->Release();
}

int main(){
    gdiscreen();
    return 0;
}

Where on this code could I get the necessary "image code" to run into a QGraphicsView?