using System;

using System.Collections.Generic;

using System.Linq;

using System.Text;

using System.Runtime.InteropServices;

using System.Drawing;

using System.Windows.Forms;

namespace RemoteControl.Client

{

class ScreenUtil

{

/// <summary>

/// 捕获屏幕

/// <para>不支持未登陆时截图</para>

/// </summary>

/// <returns></returns>

public static Image CaptureScreen1()

{

Image myImage = new Bitmap(Screen.PrimaryScreen.Bounds.Width, Screen.PrimaryScreen.Bounds.Height);

Graphics g = Graphics.FromImage(myImage);

g.CopyFromScreen(new Point(0, 0), new Point(0, 0), new Size(Screen.PrimaryScreen.Bounds.Width, Screen.PrimaryScreen.Bounds.Height));

IntPtr pDC = g.GetHdc();

g.ReleaseHdc(pDC);

return myImage;

}

[DllImport("Gdi32.dll")]

public extern static int BitBlt(IntPtr hDC, int x, int y, int nWidth, int nHeight, IntPtr hSrcDC, int xSrc, int ySrc, int dwRop);

/// <summary>

/// 捕获屏幕

/// <para>支持未登陆时截图</para>

/// </summary>

/// <returns></returns>

public static Image CaptureScreen2()

{

int width = Screen.PrimaryScreen.Bounds.Width;

int height = Screen.PrimaryScreen.Bounds.Height;

Bitmap screenCopy = new Bitmap(width, height);

using (Graphics gDest = Graphics.FromImage(screenCopy))

{

Graphics gSrc = Graphics.FromHwnd(IntPtr.Zero);

IntPtr hSrcDC = gSrc.GetHdc();

IntPtr hDC = gDest.GetHdc();

int retval = BitBlt(hDC, 0, 0, width, height, hSrcDC, 0, 0, (int)(CopyPixelOperation.SourceCopy | CopyPixelOperation.CaptureBlt));

gDest.ReleaseHdc();

gSrc.ReleaseHdc();

}

return screenCopy;

}

}

}