step7怎么创建cfc程序

STEP7可以用来创建基于S7-300/400控制器的CFC（Continuous Function Chart）程序。可以通过在工程文件结构中创建新的CFC文件实现，也可以通过添加“控制面板”控件，将其拖放到相应的作图工具窗口中。

C#实现类似的屏幕截图程序  VS2005

程序流程如下：

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

代码部分

首先新建一个项目ScreenCutter,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 ltRect.Y)

{

Rect.Y = Mouse_y

heigth = downPoint.Y - Mouse_y

}

else

{

heigth = Mouse_y - downPoint.Y

}

if (Mouse_x ltRect.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()

}

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