窗口截图(可指定HWND窗口句柄)

方法一

BOOL SaveHwndToBmpFile(HWND hWnd, LPCTSTR lpszPath) { 	HWND hDesktop = ::GetDesktopWindow(); 	ASSERT(hDesktop); 	if(NULL == hWnd) 	{ 		hWnd = hDesktop; 	} 	RECT rect; 	::GetWindowRect(hWnd, &rect);  	int nWidht = rect.right - rect.left; 	int nHeight = rect.bottom - rect.top;  	HDC hSrcDC = ::GetWindowDC(hWnd); 	ASSERT(hSrcDC); 	HDC hMemDC = ::CreateCompatibleDC(hSrcDC); 	ASSERT(hMemDC); 	HBITMAP hBitmap = ::CreateCompatibleBitmap(hSrcDC, nWidht, nHeight); 	ASSERT(hBitmap); 	HBITMAP hOldBitmap = (HBITMAP)::SelectObject(hMemDC, hBitmap); 	::BitBlt(hMemDC, 0, 0, nWidht, nHeight, hSrcDC, 0, 0, SRCCOPY);  	BITMAP bitmap = {0}; 	::GetObject(hBitmap, sizeof(BITMAP), &bitmap); 	BITMAPINFOHEADER bi = {0}; 	BITMAPFILEHEADER bf = {0}; 	 	CONST int nBitCount = 24; 	bi.biSize = sizeof(BITMAPINFOHEADER); 	bi.biWidth = bitmap.bmWidth; 	bi.biHeight = bitmap.bmHeight; 	bi.biPlanes = 1; 	bi.biBitCount = nBitCount; 	bi.biCompression = BI_RGB; 	DWORD dwSize = ((bitmap.bmWidth * nBitCount + 31) / 32) * 4 * bitmap.bmHeight;  	HANDLE hDib = GlobalAlloc(GHND, dwSize + sizeof(BITMAPINFOHEADER)); 	LPBITMAPINFOHEADER lpbi = (LPBITMAPINFOHEADER)GlobalLock(hDib); 	*lpbi = bi;  	::GetDIBits(hMemDC, hBitmap, 0, bitmap.bmHeight, (BYTE*)lpbi + sizeof(BITMAPINFOHEADER), (BITMAPINFO*)lpbi, DIB_RGB_COLORS);  	try 	{ 		CFile file; 		file.Open(lpszPath, CFile::modeCreate | CFile::modeWrite); 		bf.bfType = 0x4d42; 		dwSize += sizeof(BITMAPFILEHEADER) + sizeof(BITMAPINFOHEADER); 		bf.bfSize = dwSize; 		bf.bfOffBits = sizeof(BITMAPFILEHEADER) + sizeof(BITMAPINFOHEADER);  		file.Write((BYTE*)&bf, sizeof(BITMAPFILEHEADER)); 		file.Write((BYTE*)lpbi, dwSize); 		file.Close(); 	} 	catch(CFileException* e) 	{ 		e->ReportError(); 		e->Delete(); 	} 	 	GlobalUnlock(hDib); 	GlobalFree(hDib); 	 	::SelectObject(hMemDC, hOldBitmap); 	::DeleteObject(hBitmap); 	::DeleteDC(hMemDC); 	::ReleaseDC(hWnd, hSrcDC);  	return TRUE; }  // 调用方法 HWND hWnd = ::FindWindow(NULL, _T("XXX"));    if(hWnd)    {       SaveHwndToBmpFile(hWnd, _T("F://12.bmp"));    } 

方法二

窗口截图，可以获取遮挡窗口完整的图像，并保存到bmp文件中去。主要用到的函数中PrintWindow，VC6不支持该函数，请使用VS2008来编译。其它需求如平台要求请参考MSDN文档。

void SaveHwndToBmpFile(HWND hWnd, LPCTSTR lpszPath) { 	HDC hDC = ::GetWindowDC(hWnd); 	ASSERT(hDC); 	 	HDC hMemDC = ::CreateCompatibleDC(hDC); 	ASSERT(hMemDC); 	 	RECT rc; 	::GetWindowRect(hWnd, &rc);  	HBITMAP hBitmap = ::CreateCompatibleBitmap(hDC, rc.right - rc.left, rc.bottom - rc.top); 	ASSERT(hBitmap); 	 	HBITMAP hOldBmp = (HBITMAP)::SelectObject(hMemDC, hBitmap); 	::PrintWindow(hWnd, hMemDC, 0);  	BITMAP bitmap = {0}; 	::GetObject(hBitmap, sizeof(BITMAP), &bitmap); 	BITMAPINFOHEADER bi = {0}; 	BITMAPFILEHEADER bf = {0};  	CONST int nBitCount = 24; 	bi.biSize = sizeof(BITMAPINFOHEADER); 	bi.biWidth = bitmap.bmWidth; 	bi.biHeight = bitmap.bmHeight; 	bi.biPlanes = 1; 	bi.biBitCount = nBitCount; 	bi.biCompression = BI_RGB; 	DWORD dwSize = ((bitmap.bmWidth * nBitCount + 31) / 32) * 4 * bitmap.bmHeight;  	HANDLE hDib = GlobalAlloc(GHND, dwSize + sizeof(BITMAPINFOHEADER)); 	LPBITMAPINFOHEADER lpbi = (LPBITMAPINFOHEADER)GlobalLock(hDib); 	*lpbi = bi;  	::GetDIBits(hMemDC, hBitmap, 0, bitmap.bmHeight, (BYTE*)lpbi + sizeof(BITMAPINFOHEADER), (BITMAPINFO*)lpbi, DIB_RGB_COLORS);  	try 	{ 		CFile file; 		file.Open(lpszPath, CFile::modeCreate | CFile::modeWrite); 		bf.bfType = 0x4d42; 		dwSize += sizeof(BITMAPFILEHEADER) + sizeof(BITMAPINFOHEADER); 		bf.bfSize = dwSize; 		bf.bfOffBits = sizeof(BITMAPFILEHEADER) + sizeof(BITMAPINFOHEADER);  		file.Write((BYTE*)&bf, sizeof(BITMAPFILEHEADER)); 		file.Write((BYTE*)lpbi, dwSize); 		file.Close(); 	} 	catch(CFileException* e) 	{ 		e->ReportError(); 		e->Delete(); 	}  	GlobalUnlock(hDib); 	GlobalFree(hDib);  	::SelectObject(hMemDC, hOldBmp); 	::DeleteObject(hBitmap);	 	::DeleteObject(hMemDC); 	::ReleaseDC(hWnd, hDC); }  // 调用方法 HWND hWnd = ::FindWindow(NULL, _T("XXX")); if(hWnd) {    SaveHwndToBmpFile(hWnd, _T("F://12.bmp")); }