C#实现类似QQ的屏幕截图程序

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~~~~

源码下载地址
http://files.cnblogs.com/kevin-wu/screencutter.rar