c# 窗体截图

  private void simpleButton1_Click_1(object sender, EventArgs e)
        {
           ScreenShuts(0,0,800,600,100,300);
        }

      
 [DllImport("gdi32.dll", CharSet = CharSet.Auto, SetLastError = true, ExactSpelling = true)]
  public static extern int BitBlt(HandleRef hDC, int x, int y, int nWidth, int nHeight, HandleRef hSrcDC, int xSrc, int ySrc, int dwRop);



  //截图保存图片
  private void ScreenShuts(int intX, int intY, int intWidth, int intHeight, int intLeft, int intRight)
  {
  ////获得当前窗体的大小
  Rectangle rect = new Rectangle();
  rect = this.Bounds;
  //创建一个以当前窗体为模板的图象
  Graphics g1 = this.CreateGraphics();
  //创建以窗体大小为标准的位图
  Bitmap MyBMP = new Bitmap(intWidth, intHeight, g1);//定义位图的大小
  //创建一个位图Bitmap绘图图面
  Graphics g2 = Graphics.FromImage(MyBMP);
  //得到窗体的DC（句柄）
  IntPtr dc1 = g1.GetHdc();
  HandleRef hDcSrc = new HandleRef(null, dc1);
  //得到Bitmap的DC
  IntPtr dc2 = g2.GetHdc();
  HandleRef hDcSave = new HandleRef(null, dc2);
  //复制图块的光栅操作码
  const int SRCCOPY = 0xcc0020;  
  //调用此API函数，实现窗体捕获
  //BitBlt(dc2, intX, intY, intWidth, intHeight, dc1, intLeft, intRight, SRCCOPY);//13369376
  BitBlt(hDcSave, intX, intY, intWidth, intHeight, hDcSrc, intLeft, intRight, SRCCOPY);//13369376
  //释放掉屏幕的DC
  g1.ReleaseHdc(dc1);
  //释放掉Bitmap的DC
  g2.ReleaseHdc(dc2);
  //以JPG文件格式来保存
  MyBMP.Save("c:\\1.bmp", ImageFormat.Bmp);//Application.StartupPath + "\\
  }

*************************************万恶的分隔符.另一种******

    private void smpBtnFind_Click(object sender, EventArgs e)
        {
            CaptureDesktop("c:\\1.bmp", this.Width, this.Height);

        }

        [System.Runtime.InteropServices.DllImport("gdi32.dll")]
        public static extern IntPtr CreateDC(string driver, string device, IntPtr res1, IntPtr res2);

        public enum TernaryRasterOperations
        {
            SRCCOPY = 0x00CC0020, /* dest = source*/
            SRCPAINT = 0x00EE0086, /* dest = source OR dest*/
            SRCAND = 0x008800C6, /* dest = source AND dest*/
            SRCINVERT = 0x00660046, /* dest = source XOR dest*/
            SRCERASE = 0x00440328, /* dest = source AND (NOT dest )*/
            NOTSRCCOPY = 0x00330008, /* dest = (NOT source)*/
            NOTSRCERASE = 0x001100A6, /* dest = (NOT src) AND (NOT dest) */
            MERGECOPY = 0x00C000CA, /* dest = (source AND pattern)*/
            MERGEPAINT = 0x00BB0226, /* dest = (NOT source) OR dest*/
            PATCOPY = 0x00F00021, /* dest = pattern*/
            PATPAINT = 0x00FB0A09, /* dest = DPSnoo*/
            PATINVERT = 0x005A0049, /* dest = pattern XOR dest*/
            DSTINVERT = 0x00550009, /* dest = (NOT dest)*/
            BLACKNESS = 0x00000042, /* dest = BLACK*/
            WHITENESS = 0x00FF0062, /* dest = WHITE*/
        }


        [DllImport("gdi32.dll")]
        public static extern bool BitBlt(IntPtr hObject, int nXDest, int nYDest, int nWidth,
             int nHeight, IntPtr hObjSource, int nXSrc, int nYSrc, TernaryRasterOperations dwRop);
        public static void CaptureDesktop(string sPath, int Width, int Height)
        {
            System.Drawing.Rectangle rect = new System.Drawing.Rectangle();
            //rect = Bounds;
            FrmVideo ff = new FrmVideo();
            rect.Width = Width;//ff.Width;//.Screen.PrimaryScreen.Bounds.Width;
            rect.Height = Height;// Screen.PrimaryScreen.Bounds.Height;
            IntPtr dcTmp = CreateDC("DISPLAY", "DISPLAY", (IntPtr)null, (IntPtr)null);
            Graphics gScreen = Graphics.FromHdc(dcTmp);
            Bitmap image = new Bitmap((int)(rect.Width), (int)(rect.Height), System.Drawing.Imaging.PixelFormat.Format24bppRgb);
            Graphics gImage = Graphics.FromImage(image);
            IntPtr dcImage = gImage.GetHdc();
            IntPtr dcScreen = gScreen.GetHdc();
            BitBlt(dcImage, 0, 0, (int)(rect.Width), (int)(rect.Height), dcScreen, (int)(rect.Left), (int)(rect.Top), TernaryRasterOperations.SRCCOPY);
            gScreen.ReleaseHdc(dcScreen);
            gImage.ReleaseHdc(dcImage);
            image.Save(sPath);

        }