程序流程如下：

1.截取整个屏幕并保存
2.新开一个全屏窗口,将保存的屏幕作为背景
3.鼠标拖动改变截取范围,右键取消
4.双击截取,保存在粘贴板,全屏窗口关闭

好了,下面的是代码部分

首先新建一个项目ScreenCutter(VS2005),将窗体名改为MainForm,再新建一个窗体ScreenBody.
添加一个按钮btnCutter到ScreenCutter并添加按钮事件:
        private void btnCutter_Click(object sender, EventArgs e)
        {
            Image img = new Bitmap(Screen.AllScreens[0].Bounds.Width, Screen.AllScreens[0].Bounds.Height);
            Graphics g = Graphics.FromImage(img);
            g.CopyFromScreen(new Point(0, 0), new Point(0, 0), Screen.AllScreens[0].Bounds.Size);
            ScreenBody body = new ScreenBody();
            body.BackgroundImage = img;
            body.Show();
        }Screen.AllScreens[0]是获取当前所有设备窗口的第一个,我这里只有一个显示器,当然我就是第一个.
利用Graphics的CopyFromScreen函数获取当前屏幕.

好了,现在按下按钮全屏窗口就会出来了.

 
 
 
 下面讲全屏窗口ScreenBody,首先设置窗体的FormBorderStyle为None,然后声明以下变量
private Graphics MainPainter; //主画笔
private Pen pen; //就是笔咯
private bool isDowned; //判断鼠标是否按下
private bool RectReady; //矩形是否绘制完成
private Image baseImage; //基本图形(原来的画面)
private Rectangle Rect; //就是要保存的矩形
private Point downPoint; //鼠标按下的点
int tmpx; 
int tmpy;
之后就是窗体的鼠标函数了,里面很多代码都没有作出整理,看了一下,整理后的代码应该会更少更精简的

 

private void ScreenBody_DoubleClick(object sender, EventArgs e)
{
 if (((MouseEventArgs)e).Button == MouseButtons.Left &&Rect.Contains(((MouseEventArgs)e).X, ((MouseEventArgs)e).Y))
 {
 //保存的时候有很多种方法的......我这里只用了这种
 Image memory = new Bitmap(Rect.Width, Rect.Height);
 Graphics g = Graphics.FromImage(memory);
 g.CopyFromScreen(Rect.X + 1, Rect.Y + 1, 0, 0, Rect.Size);
 Clipboard.SetImage(memory);
 this.Close();
 }
}

private void ScreenBody_MouseDown(object sender, MouseEventArgs e)
{
 if (e.Button == MouseButtons.Left)
 {
 isDowned = true;
 
 if (RectReady == false)
 {
 Rect.X = e.X;
 Rect.Y = e.Y;
 downPoint = new Point(e.X, e.Y);
 }
 if (RectReady == true)
 {
 tmpx = e.X;
 tmpy = e.Y;
 }
 }
 if (e.Button == MouseButtons.Right)
 {
 if (RectReady != true)
 {
 this.Close();
 return;
 }
 MainPainter.DrawImage(baseImage, 0, 0);
 RectReady = false;
 }

}

private void ScreenBody_MouseUp(object sender, MouseEventArgs e)
{
 if (e.Button == MouseButtons.Left)
 {
 isDowned = false;
 RectReady = true;
 }
}

private void ScreenBody_MouseMove(object sender, MouseEventArgs e)
{

 if (RectReady == false)
 {
 if (isDowned == true)
 {
 Image New = DrawScreen((Image)baseImage.Clone(), e.X, e.Y);
 MainPainter.DrawImage(New, 0, 0);
 New.Dispose();
 }
 }
 if (RectReady == true)
 {
 if (Rect.Contains(e.X, e.Y))
 {
 //this.Cursor = Cursors.Hand;
 if (isDowned == true)
 {
 //和上一次的位置比较获取偏移量
 Rect.X = Rect.X + e.X - tmpx;
 Rect.Y = Rect.Y + e.Y - tmpy;
 //记录现在的位置
 tmpx = e.X;
 tmpy = e.Y;
 MoveRect((Image)baseImage.Clone(), Rect);
 }
 }
 }
 
}

private void ScreenBody_Load(object sender, EventArgs e)
{
 this.WindowState = FormWindowState.Maximized;
 MainPainter = this.CreateGraphics();
 pen = new Pen(Brushes.Blue);
 isDowned = false;
 baseImage = this.BackgroundImage;
 Rect = new Rectangle();
 RectReady = false;
}

辅助函数
本来应该写更多的辅助函数的,将窗体响应函数里面的代码放到里面来,不过本人很懒,就这样将就了.呵呵

private void DrawRect(Graphics Painter, int Mouse_x, int Mouse_y)
{
 int width = 0;
 int heigth = 0;
 if (Mouse_y < Rect.Y)
 {
 Rect.Y = Mouse_y;
 heigth = downPoint.Y - Mouse_y;
 }
 else
 {
 heigth = Mouse_y - downPoint.Y;
 }
 if (Mouse_x < Rect.X)
 {
 Rect.X = Mouse_x;
 width = downPoint.X - Mouse_x;
 }
 else
 {
 width = Mouse_x - downPoint.X;
 }
 Rect.Size = new Size(width, heigth);
 Painter.DrawRectangle(pen, Rect);
}

private Image DrawScreen(Image back, int Mouse_x, int Mouse_y)
{
 Graphics Painter = Graphics.FromImage(back);
 DrawRect(Painter, Mouse_x, Mouse_y);
 return back;
}
private void MoveRect(Image image, Rectangle Rect)
{
 Graphics Painter = Graphics.FromImage(image);
 Painter.DrawRectangle(pen, Rect.X, Rect.Y, Rect.Width, Rect.Height);
 DrawRects(Painter);
 MainPainter.DrawImage(image, 0, 0);
 image.Dispose();
} 
 
 [System.Runtime.InteropServices.DllImportAttribute("gdi32.dll")]
 private static extern bool BitBlt (
 IntPtr hdcDest , //目标设备的句柄
 int nXDest , // 目标对象的左上角的X坐标
 int nYDest , // 目标对象的左上角的X坐标
 int nWidth , // 目标对象的矩形的宽度
 int nHeight , // 目标对象的矩形的长度
 IntPtr hdcSrc , // 源设备的句柄
 int nXSrc , // 源对象的左上角的X坐标
 int nYSrc , // 源对象的左上角的X坐标
 System.Int32 dwRop // 光栅的操作值
 ) ;
 [ System.Runtime.InteropServices.DllImportAttribute ( "gdi32.dll" ) ]
 private static extern IntPtr CreateDC (
 string lpszDriver , // 驱动名称
 string lpszDevice , // 设备名称
 string lpszOutput , // 无用，可以设定位"NULL"
 IntPtr lpInitData // 任意的打印机数据
 ) ;
 public Image capture(int nXDest,int nYDest,int nWidth,int nHeight,int nXSrc,int nYSrc)
 {
 if(nHeight==0||nWidth==0) return null;
 this.Visible = false ;//Rectangle rc1=Screen.GetWorkingArea(this);
 //baseImage.=(Image)Screen.AllScreens[0].Bounds;//以屏幕大小创建Image对象
 //baseImage = new Bitmap(Screen.AllScreens[0].Bounds.Width, Screen.AllScreens[0].Bounds.Height);
 //MainPainter.CopyFromScreen(new Point(0, 0), new Point(0, 0), Screen.AllScreens[0].Bounds.Size);//copy屏幕
 IntPtr dc1 = CreateDC ( Screen.AllScreens[0].DeviceName, null , null , ( IntPtr ) null ) ;//创建显示器的DC
 Graphics g1 = Graphics.FromHdc (dc1) ;//由一个指定设备的句柄创建一个新的Graphics对象
 Image MyI = new Bitmap(nWidth,nHeight,g1) ;//根据屏幕大小创建一个与之相同大小的Bitmap对象
 Graphics g2 = Graphics.FromImage (MyI);//获得屏幕的句柄
 IntPtr dc3 = g1.GetHdc() ;//获得位图的句柄
 IntPtr dc2 = g2.GetHdc() ;//把当前屏幕捕获到位图对象中
 BitBlt(dc2,nXDest,nYDest,nWidth,nHeight,dc3,nXSrc,nYSrc,13369376 ) ;//把当前屏幕拷贝到位图中
 g1.ReleaseHdc ( dc3 );//释放屏幕句柄
 g2.ReleaseHdc ( dc2 );//释放位图句柄
 //MyI.Save ( "MyJpeg.jpg" , ImageFormat.Jpeg ) ;
 //MessageBox.Show("已经把当前屏幕保存MyJpeg.jpg文件中！","www");
 this.Visible = true ;
 return MyI;
 }
 private void Form1_Load(object sender, System.EventArgs e)
 {

 MainPainter = this.CreateGraphics();
 Back = capture(0,0,Screen.PrimaryScreen.Bounds.Width,Screen.PrimaryScreen.Bounds.Height,0,0);
 this.BackgroundImage=(Image)Back.Clone();
 Rect = new Rectangle();
 RectReady = false;
 pen = new Pen(Color.FromArgb(100,Color.Black));
 this.Opacity=100;
 isDowned = false;
 }

 private void Form1_MouseDown(object sender, System.Windows.Forms.MouseEventArgs e)
 {
 if (e.Button == MouseButtons.Left)
 {
 isDowned = true;
 if (RectReady == false)
 {
 Rect.X = e.X;
 Rect.Y = e.Y;
 downPoint = new Point(e.X, e.Y);
 }
 if (RectReady == true)
 {
 tmpx = e.X;
 tmpy = e.Y;
 }
 }
 if (e.Button == MouseButtons.Right)
 {
 if (RectReady != true)
 {
 this.Close();
 return;
 }
 MainPainter.DrawImage(Back, 0, 0);
 RectReady=false;
 }
 }
 private void Form1_MouseUp(object sender, System.Windows.Forms.MouseEventArgs e)
 {
 if (e.Button == MouseButtons.Left)
 {
 isDowned = false;
 RectReady = true;
 }
 }
 private void Form1_DoubleClick(object sender, System.EventArgs e)
 
 
  
  {
 //if (((MouseEventArgs)e).Button == MouseButtons.Left && Rect.Contains(((MouseEventArgs)e).X, ((MouseEventArgs)e).Y))
 //{
 //保存的时候有很多种方法的......我这里只用了这种
 //Image myImage = new Bitmap(Rect.Width, Rect.Height);
 //Graphics g = Graphics.FromImage(myImage);
 //g.TranslateClip(Rect.X,Rect.Y);
 //g.CopyFromScreen(Rect.X+1, Rect.Y+1, 0, 0, Rect.Size);
 //g.FillRectangle(new TextureBrush(Back),Rect.Location.X,Rect.Location.Y,Rect.Width, Rect.Height);
 //Clipboard.SetImage(myImage);//系统剪切板
 Image M=capture(0,0,Rect.Width,Rect.Height,Rect.X,Rect.Y);
 if(M==null) {this.Close();return;}
 Clipboard.SetDataObject(M,true);
 M = (Image)Clipboard.GetDataObject().GetData(DataFormats.Bitmap,true);
 SaveImage();
 this.Close();
 //}
 }
 private void Form1_MouseMove(object sender, System.Windows.Forms.MouseEventArgs e)
 {
 if (RectReady == false)
 {
 if (isDowned == true)
 {
 DrawScreen(e.X, e.Y);
 }
 }
 if (RectReady == true)
 {
 if (Rect.Contains(e.X, e.Y))
 {
 //this.Cursor = Cursors.Hand;
 if (isDowned == true)
 {
 //和上一次的位置比较获取偏移量
 Rect.X = Rect.X + e.X - tmpx;
 Rect.Y = Rect.Y + e.Y - tmpy;
 tmpx = e.X;//记录现在的位置
 tmpy = e.Y;
 MoveRect(Rect);
 }
 }
 }
 }
 private void DrawRect(int Mouse_x, int Mouse_y)
 {
 int width = 0;
 int heigth = 0;
 if (Mouse_y < Rect.Y)
 {
 Rect.Y = Mouse_y;
 heigth = downPoint.Y - Mouse_y;
 }
 else
 {
 heigth = Mouse_y - downPoint.Y;
 }
 if (Mouse_x < Rect.X)
 {
 Rect.X = Mouse_x;
 width = downPoint.X - Mouse_x;
 }
 else
 {
 width = Mouse_x - downPoint.X;
 }
 Rect.Size = new Size(width, heigth);
 MainPainter.DrawRectangle(pen, Rect);
 }//绘制矩形
 private void DrawScreen(int Mouse_x, int Mouse_y)
 {
 //this.BackgroundImage = (Image)Back.Clone();
 MainPainter.FillRectangle(new TextureBrush(Back), 0, 0, this.Width, this.Height); 
 DrawRect( Mouse_x, Mouse_y);
 //this.Invalidate(new Rectangle(Rect.X,Rect.Y,Rect.Width,Rect.Height)); 
 }
 private void MoveRect(Rectangle Rect)
 {
 MainPainter.FillRectangle(new TextureBrush(Back), 0, 0, this.Width, this.Height);
 MainPainter.DrawRectangle(pen, Rect);
 //this.Invalidate(new Rectangle(Rect.X, Rect.Y, Rect.Width, Rect.Height)); 
 }
 public void SaveImage()
 {
 Image MyI = (Image)Clipboard.GetDataObject().GetData(DataFormats.Bitmap,true);
 Sd.OverwritePrompt = true;
 Sd.CheckPathExists = true;
 Sd.Filter = "图片文件(*.jpg)|*.jpg|(*.gif)|*.gif|位图文件(*.bmp)|*.bmp";
 Sd.ShowHelp = true;
 if (Sd.ShowDialog() == DialogResult.OK)
 {
 string filename = Sd.FileName;
 string st = filename.Remove(0, filename.Length - 3);
 switch (st)
 {
 case "jpg":
 MyI.Save(filename, ImageFormat.Jpeg);
 break;
 case "gif":
 MyI.Save(filename, ImageFormat.Gif);
 break;
 case "bmp":
 MyI.Save(filename, ImageFormat.Bmp);
 break;
 default:
 MyI.Save(filename, ImageFormat.Jpeg);
 break;
 }
 }
 }

 private void Form1_KeyDown(object sender, System.Windows.Forms.KeyEventArgs e)
 {
 if(RectReady != true) return;
 switch (e.KeyData)
 {
 case Keys.Up:
 Rect.Y--;
 break;
 case Keys.Down:
 Rect.Y++;
 break;
 case Keys.Left:
 Rect.X--;
 break;
 case Keys.Right:
 Rect.X++;
 break;
 case Keys.Enter:
 Form1_DoubleClick(sender,e);
 break;
 default:
 break;
 }
 MoveRect(Rect);
 }
}
} 

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