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I have used the below code to take the screenshots and save it in a .Jpg file format.
I need to convert it to blob in order to save it in a database.
Please help me how to do this. In this code, Where is the binary data of the image found that can be saved to the database??


void CscreensaveDlg::OnBnClickedOk()
{
	// TODO: Add your control notification handler code here   
	HDC hScrDC = ::GetDC(NULL);
	HDC hMemDC = NULL;
 
	BYTE *lpBitmapBits = NULL; 
 
	int nWidth = GetSystemMetrics(SM_CXSCREEN);
	int nHeight = GetSystemMetrics(SM_CYSCREEN); 
 
	hMemDC = ::CreateCompatibleDC(hScrDC); 
 
	BITMAPINFO bi; 
	ZeroMemory(&bi, sizeof(BITMAPINFO));
	bi.bmiHeader.biSize = sizeof(BITMAPINFOHEADER);
	bi.bmiHeader.biWidth = nWidth;
	bi.bmiHeader.biHeight = nHeight;
	bi.bmiHeader.biPlanes = 1;
	bi.bmiHeader.biBitCount = 24;
 
	HBITMAP bitmap = ::CreateDIBSection(hMemDC, &bi, DIB_RGB_COLORS, (LPVOID*)&lpBitmapBits, NULL, 0);
	HGDIOBJ oldbmp = ::SelectObject(hMemDC, bitmap); 
 
	::BitBlt(hMemDC, 0, 0, nWidth, nHeight, hScrDC, 0, 0, SRCCOPY);
 
	BITMAPFILEHEADER bh;
	ZeroMemory(&bh, sizeof(BITMAPFILEHEADER));
	bh.bfType = 0x4d42; //bitmap 
	bh.bfOffBits = sizeof(BITMAPFILEHEADER) + sizeof(BITMAPINFOHEADER);
	bh.bfSize = bh.bfOffBits + ((nWidth*nHeight)*3);
 
	CFile file;	
	char buffer[1000];
	DWORD threadId;
  int value = 10;
  //hThread = CreateThread( NULL, 0, runThread, &value, 0, &threadId);
	for(int c=0;c<10;c++)
	{
		 sprintf_s(buffer,"D:\image%u.jpg",c);
		 CString sName(buffer);  
         LPCTSTR lpszName = sName;  
		if(file.Open(lpszName, CFile::modeCreate | CFile::modeWrite))
		{ 
			file.Write(&bh, sizeof(BITMAPFILEHEADER));
			file.Write(&(bi.bmiHeader), sizeof(BITMAPINFOHEADER));
			file.Write(lpBitmapBits, 3 * nWidth * nHeight);
			file.Close();
			Sleep(10000);
		}
		
	}
	::SelectObject(hMemDC, oldbmp);
	::DeleteObject(bitmap);
	::DeleteObject(hMemDC);
	::ReleaseDC(NULL, hScrDC); 
 
	
    
	
}
Posted 20-Apr-11 21:08pm
Updated 21-Apr-11 2:35am
v3

1 solution

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Solution 1

Hope this[^] might help you.
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