WIN32API 获得特定坐标的像素

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1. using System;
   
2. using System.Collections.Generic;
   
3. using System.Linq;
   
4. using System.Text;
   
5. using System.Runtime.InteropServices;
   
6. using System.Drawing;
   
7. 
   
8. namespace MarkRecognized
   
9. {
   
10.     static class WIN32API
    
11.     {
    
12.         #region 获取屏幕上任意一点的颜色
    
13.         /*
    
14.          * code from
    
15.         http://dcxl.blog.sohu.com/113453543.html
    
16.         http://zhidao.baidu.com/question/372951254.html
    
17.          * changed somewhere needed.
    
18.           */
    
19.         [DllImport("user32", ExactSpelling = true, CharSet = CharSet.Ansi, SetLastError = true)]
    
20.         private static extern IntPtr GetDC(IntPtr hwnd);
    
21. 
    
22.         [DllImport("gdi32", ExactSpelling = true, CharSet = CharSet.Ansi, SetLastError = true)]
    
23.         private static extern uint GetPixel(IntPtr hdc, int x, int y);
    
24. 
    
25.         [DllImport("user32", ExactSpelling = true, CharSet = CharSet.Ansi, SetLastError = true)] //确定坐标
    
26.         private static extern int ReleaseDC(IntPtr hwnd, IntPtr hdc);
    
27. 
    
28.         [DllImport("user32", ExactSpelling = true, CharSet = CharSet.Ansi, SetLastError = true)]
    
29.         private static extern int ScreenToClient(int hwnd, ref Point lpPoint);
    
30. 
    
31.         [DllImport("user32", ExactSpelling = true, CharSet = CharSet.Ansi, SetLastError = true)]
    
32.         private static extern int WindowFromPoint(int xPoint, int yPoint);
    
33. 
    
34. 
    
35. 
    
36. 
    
37. 
    
38.         public static System.Drawing.Color GetPixelFromScreenPoint(int x, int y)
    
39.         {
    
40.             return GetPixelFromPoint(x, y, IntPtr.Zero);
    
41.         }
    
42. 
    
43.         public static System.Drawing.Color GetPixelFromPoint(int x, int y,IntPtr Dc)
    
44.         {
    
45.             IntPtr hdc = GetDC(Dc);
    
46.             uint pixel = GetPixel(hdc, x, y);
    
47.             ReleaseDC(Dc, hdc);
    
48.             Color color =
    
49.                 Color.FromArgb(
    
50.                 (int)(pixel & 0xFF000000) >> 24,
    
51.                 (int)(pixel & 0x000000FF),
    
52.                 (int)(pixel & 0x0000FF00) >> 8,
    
53.                 (int)(pixel & 0x00FF0000) >> 16);
    
54.             return color;
    
55.         }
    
56. 
    
57.         public static System.Drawing.Color GetPixelFromPoint(Point p, IntPtr Dc)
    
58.         {
    
59.             return GetPixelFromPoint(p.X, p.Y, Dc);
    
60.         }
    
61. 
    
62.         public static System.Drawing.Color GetPixelFromScreenPoint(Point p)
    
63.         {
    
64.             return GetPixelFromPoint(p, IntPtr.Zero);
    
65.         }
    
66.         #endregion
    
67.     }
    
68. }

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1. private void IPCam_MouseMove(object sender, MouseEventArgs e)
   
2. {
   
3.     try
   
4.     {
   
5.         Color currentColor = WIN32API.GetPixelFromPoint(e.Location, this.IPCam.Handle);
   
6.         this.toolStripStatusLabelColorSnap.Text = currentColor.ToString();
   
7.         this.toolStripStatusLabelShowColor.ForeColor = currentColor;
   
8. 
   
9.     }
   
10.     catch { }
    
11. }

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no1234

记一下吧，虽然不会用，但是必经之路啊

michel

这个是什么啊?不是易语言?

兔子君

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