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~~~~