Program.cs

using System; using System.Drawing; using System.Runtime.InteropServices; using System.Threading; using static System.Net.Mime.MediaTypeNames; class Program { private const int SM_XVIRTUALSCREEN = 76; private const int SM_YVIRTUALSCREEN = 77; private const int SM_CXVIRTUALSCREEN = 78; private const int SM_CYVIRTUALSCREEN = 79; private const int SRCCOPY = 0x00CC0020; private const int CAPTUREBLT = 0x40000000; [DllImport("user32.dll")] private static extern int GetSystemMetrics(int nIndex); [DllImport("user32.dll")] private static extern IntPtr GetDC(int hWnd); [DllImport("gdi32.dll")] private static extern IntPtr CreateCompatibleDC(IntPtr hdc); [DllImport("gdi32.dll")] private static extern IntPtr CreateCompatibleBitmap(IntPtr hdc, int nWidth, int nHeight); [DllImport("gdi32.dll")] private static extern IntPtr SelectObject(IntPtr hdc, IntPtr hgdiobj); [DllImport("gdi32.dll")] private static extern bool BitBlt(IntPtr hdcDest, int xDest, int yDest, int wDest, int hDest, IntPtr hdcSrc, int xSrc, int ySrc, int dwRop); [DllImport("gdi32.dll")] private static extern bool DeleteObject(IntPtr hObject); [DllImport("user32.dll")] private static extern int ReleaseDC(IntPtr hWnd, IntPtr hdc); static void Main() { Console.ReadLine(); Thread.Sleep(5000); int x = GetSystemMetrics(SM_XVIRTUALSCREEN); // left (e.g. -1024) int y = GetSystemMetrics(SM_YVIRTUALSCREEN); // top (e.g. -34) int cx = GetSystemMetrics(SM_CXVIRTUALSCREEN); // entire width (e.g. 2704) int cy = GetSystemMetrics(SM_CYVIRTUALSCREEN); // entire height (e.g. 1050) IntPtr dcScreen = GetDC((int)IntPtr.Zero); IntPtr dcTarget = CreateCompatibleDC(dcScreen); IntPtr bmpTarget = CreateCompatibleBitmap(dcScreen, cx, cy); IntPtr oldBmp = SelectObject(dcTarget, bmpTarget); BitBlt(dcTarget, 0, 0, cx, cy, dcScreen, x, y, SRCCOPY | CAPTUREBLT); SelectObject(dcTarget, oldBmp); // Save the screenshot as an image file using (Bitmap screenshot = System.Drawing.Image.FromHbitmap(bmpTarget)) { screenshot.Save("D:/screenshot.png", System.Drawing.Imaging.ImageFormat.Png); } // Cleanup DeleteObject(bmpTarget); DeleteObject(oldBmp); DeleteObject(dcTarget); ReleaseDC(IntPtr.Zero, dcScreen); } }