screenshot

[KLG7]

Hallo,
Wie kann ich einen Screenshot schnell machen???
Weil GetPixel in einer for Schleife abzufragen ist zu langsam

[gosha16]

schonmal versucht "screenshot" in der Forensuche einzutippen...?

[..]

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;
}