C#实现类似qq的屏幕截图程序

C#实现类似qq的屏幕截图程序

come from : http://hi.baidu.com/hbuangel/blog/item/d4bef536963d62300b55a92a.html

因为近来想写个类似于远程桌面监控的程序,该程序中要用到屏幕捕捉.为实现该程序的一部分功能,做了个小DEMO.程序很简单，用到的技术也不多，只能实现类似qq的截图功能(方法虽然很笨) 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(); } 到这里,代码就算是写完了,运行 截取结果,这里截取的边界没有控制好,所以还有边界可以见到,稍微设置一下就可以了 好了,这个东东就这样搞完了，接下来要做利用钩子的了....希望能够快点完成,累呀~~~~