屏幕截图代码

//截图

INT CAnimationHelper::_GetScreenShotData( HWND hWnd, LPRECT rcShot, BYTE ** ppBuf ) {  //截图  HDC hDcWnd = NULL;  if (hWnd)  {   hDcWnd = ::GetDC(hWnd);  }  else  {   HWND hWndDesk = ::GetDesktopWindow();   hDcWnd = ::GetDC(hWndDesk);  }  WORD nBitPerPixel = (WORD)::GetDeviceCaps(hDcWnd, BITSPIXEL);  INT nWidth = rcShot->right-rcShot->left;  INT nHeight = rcShot->bottom-rcShot->top;  INT nOffset = sizeof(BITMAPFILEHEADER) + sizeof(BITMAPINFOHEADER);  DWORD dwSize = nBitPerPixel*nWidth*nHeight + nOffset;  *ppBuf = new BYTE[dwSize];  HDC hDcMem = ::CreateCompatibleDC(hDcWnd);  HBITMAP hBmpMem = ::CreateCompatibleBitmap(hDcWnd, nWidth, nHeight);  HBITMAP hBmpOld = (HBITMAP)::SelectObject(hDcMem, hBmpMem);  ::BitBlt(hDcMem, 0, 0, nWidth, nHeight, hDcWnd, rcShot->left, rcShot->top, SRCCOPY);

 BITMAPINFO bih = {0};  bih.bmiHeader.biBitCount = nBitPerPixel;  bih.bmiHeader.biCompression = BI_RGB;  bih.bmiHeader.biHeight = nHeight;  bih.bmiHeader.biPlanes = 1;  bih.bmiHeader.biSize = sizeof(BITMAPINFOHEADER);  bih.bmiHeader.biSizeImage = nBitPerPixel*nWidth*nHeight;  bih.bmiHeader.biWidth = nWidth;

 BITMAPFILEHEADER bfh = {0};  bfh.bfOffBits = nOffset;  bfh.bfSize = dwSize;  bfh.bfType = (WORD)0x4d42;

 memcpy(*ppBuf, &bfh, sizeof(BITMAPFILEHEADER));  memcpy((*ppBuf)+sizeof(BITMAPFILEHEADER), &bih.bmiHeader, sizeof(BITMAPINFOHEADER));

 ::GetDIBits(hDcMem, hBmpMem, 0, nHeight, (*ppBuf)+nOffset, &bih, DIB_RGB_COLORS);

 if (nBitPerPixel==32)  {   BYTE *pData = (*ppBuf)+nOffset+3;   for (INT i=0; i<nHeight; i++)   {    for (INT j = 0; j<nWidth; j++)    {     *pData = 0xFF;     pData += 4;    }   }  } 

 //for test //  FILE *fp = _wfopen(L"E:\\a.bmp", L"w+b"); //  fwrite(*ppBuf, 1, dwSize, fp);//写入位图数据 //  fclose(fp);

 ::SelectObject(hDcMem, hBmpOld);  ::DeleteObject(hBmpMem);  ::DeleteObject(hDcMem);  ::ReleaseDC(hWnd,hDcWnd);

 return dwSize; }