screenshot
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Hallo,
Wie kann ich einen Screenshot schnell machen???
Weil GetPixel in einer for Schleife abzufragen ist zu langsam
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schonmal versucht "screenshot" in der Forensuche einzutippen...?
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void doscreen(string filename /*aber bitmap also z.B. test.bmp*/) { int nWidth = GetSystemMetrics(SM_CXSCREEN); int nHeight = GetSystemMetrics(SM_CYSCREEN); HWND hWnd = ::GetDesktopWindow(); HDC hdc = ::GetDC(hWnd); HDC memDC = ::CreateCompatibleDC(hdc); HBITMAP hbm = ::CreateCompatibleBitmap(hdc, nWidth, nHeight); HBITMAP hbmOld = (HBITMAP) ::SelectObject(memDC, hbm); ::BitBlt(memDC, 0, 0, nWidth, nHeight, hdc, 0, 0, SRCCOPY); BITMAPINFO bmi; ZeroMemory(&bmi, sizeof(bmi)); bmi.bmiHeader.biSize = sizeof(BITMAPINFOHEADER); bmi.bmiHeader.biWidth = nWidth; bmi.bmiHeader.biHeight = nHeight; bmi.bmiHeader.biBitCount = 24; bmi.bmiHeader.biPlanes = 1; bmi.bmiHeader.biCompression = BI_RGB; bmi.bmiHeader.biSizeImage = 32 * nWidth * nHeight / 8; BYTE *pbBits = new BYTE[bmi.bmiHeader.biSizeImage]; ::GetDIBits(memDC, hbm, 0, bmi.bmiHeader.biHeight, pbBits, &bmi, DIB_RGB_COLORS ); BITMAPFILEHEADER bfh; bfh.bfType = ('M' << 8) + 'B'; bfh.bfSize = sizeof(BITMAPFILEHEADER) + bmi.bmiHeader.biSizeImage + sizeof(BITMAPINFOHEADER); bfh.bfReserved1 = 0; bfh.bfReserved2 = 0; bfh.bfOffBits = sizeof(BITMAPFILEHEADER) + sizeof(BITMAPINFOHEADER); HANDLE hfile = CreateFile(filename.c_str(), GENERIC_WRITE, 0, 0, OPEN_ALWAYS, 0, 0); DWORD dwWritten; WriteFile(hfile, &bfh, sizeof(bfh), &dwWritten, NULL); WriteFile(hfile, &bmi.bmiHeader, sizeof(BITMAPINFOHEADER), &dwWritten, NULL); WriteFile(hfile, pbBits, bmi.bmiHeader.biSizeImage, &dwWritten, NULL); CloseHandle(hfile); ::SelectObject(memDC, hbmOld); ::DeleteDC(memDC); ::ReleaseDC(hWnd, hdc); ::DeleteObject(hbm); delete[] pbBits; }