C#截取螢幕

/// <summary> /// 截取螢幕 /// </summary> class ScreenGrab { #region Functional imports for ScreenGrab functionality [DllImport("GDI32.dll")] public static extern bool BitBlt(int hdcDest, int nXDest, int nYDest, int nWidth, int nHeight, int hdcSrc, int nXSrc, int nYSrc, int dwRop); [DllImport("GDI32.dll")] public static extern int CreateCompatibleBitmap(int hdc, int nWidth, int nHeight); [DllImport("GDI32.dll")] public static extern int CreateCompatibleDC(int hdc); [DllImport("GDI32.dll")] public static extern bool DeleteDC(int hdc); [DllImport("GDI32.dll")] public static extern bool DeleteObject(int hObject); [DllImport("GDI32.dll")] public static extern int GetDeviceCaps(int hdc, int nIndex); [DllImport("GDI32.dll")] public static extern int SelectObject(int hdc, int hgdiobj); [DllImport("User32.dll")] public static extern int GetDesktopWindow(); [DllImport("User32.dll")] public static extern int GetWindowDC(int hWnd); [DllImport("User32.dll")] public static extern int ReleaseDC(int hWnd, int hDC); #endregion // Captures the current on-screen representation using Windows API calls public Bitmap CaptureScreen() { // Provides a pointer to the visual representation of the desktop window int source = GetWindowDC(GetDesktopWindow()); // Secures the image using CreateCompatibleBitmap int bitmap = CreateCompatibleBitmap(source, GetDeviceCaps(source, 8), GetDeviceCaps(source, 10)); int destination = CreateCompatibleDC(source); SelectObject(destination, bitmap); BitBlt(destination, 0, 0, GetDeviceCaps(source, 8), GetDeviceCaps(source, 10), source, 0, 0, 0x00CC0020); Bitmap image = GetImage(bitmap); Cleanup(bitmap, source, destination); return image; } private void Cleanup(int bitmap, int source, int destination) { ReleaseDC(GetDesktopWindow(), source); DeleteDC(destination); DeleteObject(bitmap); } private Bitmap GetImage(int hBitmap) { Bitmap image = new Bitmap(Image.FromHbitmap(new IntPtr(hBitmap)), Image.FromHbitmap(new IntPtr(hBitmap)).Width, Image.FromHbitmap(new IntPtr(hBitmap)).Height); return image; } }