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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)
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.{ 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(); } 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~~~~ 源码下载地址 友情提示: 如需转载本文,请遵守"本站协议"并加入下面声明 且注明原文链接。 作者:kevin wu 来源:kevin wu's corner |
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