C # implement the screenshot software function,

C # implement software functions,

This article is a small example of using C # To develop software for learning and sharing.

Ideas:

Knowledge points involved:

• MenuStrip: provides a menu system for the form. Use ToolStripMenuItem as the menu sub-option
• ToolStrip: Provides containers for Windows toolbar objects. Use ToolStripButton to [indicate the options that contain text and images] as a sub-element of the toolbar.
• PictureBox: A Windows Image box control used to display images. However, this article overwrites this space.
• Screen: used to obtain the work Screen area
• Graphics: encapsulate a GDI + drawing. This class cannot be inherited. This CopyFromScreen method is used to obtain screen images.
• Mouse events: including MouseDown, MouseMove, and MouseUp events. You can use the Location in MouseEventArgs to obtain the mouse position.
• Clipboard: provides methods to place data in the system Clipboard and retrieve data from it. This class cannot be inherited.
• Cursor: Set the Cursor style displayed by the mouse.
• OnPaint: repaint event. The event is returned when the control is refreshed.

As shown in the following figure ]:

The saved image is as follows:

Bytes -------------------------------------------------------------------------------------------------------------------------------

The core code is as follows:

Screenshot screen image:

1 public Bitmap GetScreen () 2 {3 // obtain the entire Screen image, excluding taskbar 4 Rectangle ScreenArea = Screen. getWorkingArea (this); 5 Bitmap bmp = new Bitmap (ScreenArea. width, ScreenArea. height); 6 using (Graphics g = Graphics. fromImage (bmp) 7 {8g. copyFromScreen (0, 0, 0, 0, new Size (ScreenArea. width, ScreenArea. height); 9} 10 return bmp; 11}

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Graphic drawing function:

1 # region painting function 2 3 protected override void OnPaint (PaintEventArgs pe) 4 {5 base. onPaint (pe); 6 Graphics g = pe. graphics; 7 DrawHistory (g); 8 // draw the current line 9 if (startDraw & this. curLine. pointList! = Null & this. curLine. PointList. Count> 0) 10 {11 DrawLine (g, this. curLine); 12} 13 if (startDraw & this. curRect. Start! = Null & this. curRect. End! = Null & this. curRect. Start! = This. curRect. end) {14 DrawRectangle (g, this. curRect); 15} 16} 17 18 public void DrawHistory (Graphics g) {19 // draw line history 20 if (LineHistory! = Null) 21 {22 foreach (HLine lh in LineHistory) 23 {24 if (lh. pointList. count> 10) 25 {26 DrawLine (g, lh); 27} 28} 29} 30 // draw a rectangle history 31 if (RectHistory! = Null) 32 {33 foreach (HRectangle lh in RectHistory) 34 {35 if (lh. Start! = Null & lh. End! = Null & lh. Start! = Lh. end) 36 {37 DrawRectangle (g, lh ); 38} 39} 40} 41} 42 43 // <summary> 44 // draw line 45 /// </summary> 46 // <param name = "g "> </param> 47 // <param name =" line "> </param> 48 private void DrawLine (Graphics g, HLine) {49g. smoothingMode = SmoothingMode. antiAlias; 50 using (Pen p = new Pen (line. lineColor, line. lineWidth) 51 {52 // set the start and end point of the line Cap 53 p. startCap = LineCap. round; 54 p. endCap = LineCap. round; 55 56 // set the join style for two consecutive segments 57 p. lineJoin = LineJoin. round; 58g. drawCurve (p, line. pointList. toArray ()); // draw a smooth curve 59} 60} 61 62 // <summary> 63 // draw a rectangle 64 // </summary> 65 // <param name =" g "> </param> 66 // <param name =" rect "> </param> 67 private void DrawRectangle (Graphics g, HRectangle rect) 68 {69g. smoothingMode = SmoothingMode. antiAlias; 70 using (Pen p = new Pen (rect. lineColor, rect. lineWidth) 71 {72 // set the start and end point line Cap 73 p. startCap = LineCap. round; 74 p. endCap = LineCap. round; 75 76 // set the join style for two consecutive segments 77 p. lineJoin = LineJoin. round; 78g. drawRectangle (p, rect. start. x, rect. start. y, rect. end. x-rect. start. x, rect. end. y-rect. start. y); // draw a smoothing curve 79} 80} 81 82 public void Earser (Point p0) 83 {84 for (int I = lineHistory. count-1; I> = 0; I --) 85 {86 HLine = lineHistory [I]; 87 bool flag = false; 88 foreach (Point p1 in line. pointList) 89 {90 double distance = GetDistance (p0, p1); 91 if (Math. abs (distance) <6) 92 {93 // Delete 94 flag = true; 95 break; 96} 97 98} 99 if (flag) 100 {101 lineHistory. removeAt (I); 102} 103} 104 // erase the rectangle 105 for (int I = rectHistory. count-1; I> = 0; I --) 106 {107 HRectangle rect = rectHistory [I]; 108 109 if (distinct x> rect. start. X & amp; # X <rect. end. X & Policy> rect. start. Y & Policy <rect. end. y) {110 111 rectHistory. removeAt (I ); 112} 113} 114} 115 116 // <summary> 117 // obtain the distance between two points 118 /// </summary> 119 // <param name =" p0 "> </param> 120 // <param name =" p1 "> </param> 121 // <returns> </returns> 122 private double GetDistance (Point p0, point p1) {123 return Math. sqrt (Math. pow (p0.X-p1.X), 2) + Math. pow (p0.Y-p1.Y), 2); 124} 125 126 # endregion

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The following is a connection to the source code function. If you need it, you can download it by yourself.

Source code Link