C#实现类似qq的屏幕截图程序

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~~~~

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作者：kevin wu

来源：kevin wu's corner