How to display image using CreateDIBSection - c++

Question

I want to display a images on window, am giving image data as in buffer &CaptureBuffer to CreateDIBSection, CreateDIBForVideo method is calling from thread on main().
dont know where im going wrong it is showing black window.
void CreateDIBForVideo()
{
// ScreenCaptureProcessorGDI is a class it have initialization for capture window screen
screenObject = new ScreenCaptureProcessorGDI();
screenObject->init();
HDC DisplayDC = CreateDC((LPCWSTR)"DISPLAY", NULL, NULL, NULL);
BITMAPINFO bmpInfo = { 0 };
bmpInfo.bmiHeader.biSize= sizeof(BITMAPINFOHEADER);
bmpInfo.bmiHeader.biWidth = screenObject->lOutputDuplDesc.ModeDesc.Width;
bmpInfo.bmiHeader.biHeight= screenObject->lOutputDuplDesc.ModeDesc.Height;
bmpInfo.bmiHeader.biPlanes = 1;
bmpInfo.bmiHeader.biBitCount = 32;
bmpInfo.bmiHeader.biCompression = BI_RGB;
bmpInfo.bmiHeader.biSizeImage = (4 * screenObject->lOutputDuplDesc.ModeDesc.Width * screenObject->lOutputDuplDesc.ModeDesc.Height);
bmpInfo.bmiHeader.biXPelsPerMeter = 0;
bmpInfo.bmiHeader.biYPelsPerMeter = 0;
bmpInfo.bmiHeader.biClrUsed = 0;
bmpInfo.bmiHeader.biClrImportant = 0;
CaptureBuffer = NULL;
HDC pXorDC = CreateCompatibleDC(DisplayDC);
HBITMAP hXorDib = CreateDIBSection(DisplayDC, &bmpInfo, DIB_RGB_COLORS, (void**)&CaptureBuffer, NULL, 0);
hXorTemp = (HBITMAP)SelectObject(pXorDC, hXorDib);
// startGrab this thread capture a windows screen after init()
CreateThread(NULL, 0, (LPTHREAD_START_ROUTINE)&startGrab, NULL, 0, NULL);
}
void startGrab()
{
for (int index = 0; index < 100; index++)
{
// grabImage will capture window screen and send image as a buffer to `CaptureBuffer`
screenObject->grabImage();
PaintViewerWindow();
UpdateWindow(global_hWnd);
::Sleep(2000);
}
}
void PaintViewerWindow()
{
HDC paintDC;
PAINTSTRUCT ps;
paintDC = BeginPaint(global_hWnd, &ps);
SetStretchBltMode(paintDC, HALFTONE);
BitBlt(paintDC, 0, 0, 1366, 768, pXorDC, 0, 0, SRCCOPY);
EndPaint(global_hWnd, &ps);
}

Answer 1

I find a solution for the above problem
It because of UCHAR *CaptureBuffer am directly passing CaptureBuffer to the CreateDIBSection now i changed to copying UCHAR *CaptureBuffer to char *DisplayBuffer its working fine now.
UCHAR *CaptureBuffer = NULL;
char *DisplayBuffer = NULL;
long CaptureSize = NULL;
void saveImage(unsigned int frame_num, BITMAPINFO &lBmpInfo, std::unique_ptr<BYTE> pBuf, UCHAR* &CaptureBuffer, long &CaptureSize)
{
BITMAPFILEHEADER bmpFileHeader;
bmpFileHeader.bfReserved1 = 0;
bmpFileHeader.bfReserved2 = 0;
bmpFileHeader.bfSize = sizeof(BITMAPFILEHEADER) + sizeof(BITMAPINFOHEADER) + lBmpInfo.bmiHeader.biSizeImage;
bmpFileHeader.bfType = 'MB';
bmpFileHeader.bfOffBits = sizeof(BITMAPFILEHEADER) + sizeof(BITMAPINFOHEADER);
CaptureSize = lBmpInfo.bmiHeader.biSizeImage;
CaptureBuffer = (UCHAR*)malloc(CaptureSize);
memcpy(CaptureBuffer, pBuf.get(), lBmpInfo.bmiHeader.biSizeImage);
//Here am copying CaptureBuffer(uchar) to DisplayBuffer(char)
memcpy(DisplayBuffer, CaptureBuffer, CaptureSize);
lresult = 0;
}
void CreateDIBForVideo()
{
// ScreenCaptureProcessorGDI is a class it have initialization for capture window screen
screenObject = new ScreenCaptureProcessorGDI();
screenObject->init();
HDC DisplayDC = CreateDC((LPCWSTR)"DISPLAY", NULL, NULL, NULL);
BITMAPINFO bmpInfo = { 0 };
bmpInfo.bmiHeader.biSize= sizeof(BITMAPINFOHEADER);
bmpInfo.bmiHeader.biWidth = screenObject->lOutputDuplDesc.ModeDesc.Width;
bmpInfo.bmiHeader.biHeight= screenObject->lOutputDuplDesc.ModeDesc.Height;
bmpInfo.bmiHeader.biPlanes = 1;
bmpInfo.bmiHeader.biBitCount = 32;
bmpInfo.bmiHeader.biCompression = BI_RGB;
bmpInfo.bmiHeader.biSizeImage = (4 * screenObject->lOutputDuplDesc.ModeDesc.Width * screenObject->lOutputDuplDesc.ModeDesc.Height);
bmpInfo.bmiHeader.biXPelsPerMeter = 0;
bmpInfo.bmiHeader.biYPelsPerMeter = 0;
bmpInfo.bmiHeader.biClrUsed = 0;
bmpInfo.bmiHeader.biClrImportant = 0;
CaptureBuffer = NULL;
HDC pXorDC = CreateCompatibleDC(DisplayDC);
HBITMAP hXorDib = CreateDIBSection(DisplayDC, &bmpInfo, DIB_RGB_COLORS, (void**)&DisplayBuffer, NULL, 0);
hXorTemp = (HBITMAP)SelectObject(pXorDC, hXorDib);
// startGrab this thread capture a windows screen after init()
CreateThread(NULL, 0, (LPTHREAD_START_ROUTINE)&startGrab, NULL, 0, NULL);
}