//http://cherishlc.iteye.com/blog/1687738
1 using System;
2 using System.Collections.Generic;
3 using System.Drawing;
4 using System.Linq;
5 using System.Runtime.InteropServices;
6 using System.Text;
7 using System.Threading.Tasks;
8 using System.Windows.Forms;
9
10 namespace LC
11 {
12 class ScreenCapture
13 {
14 #region 抓取屏幕
15 /// <summary>
16 /// 抓取屏幕(层叠的窗口)
17 /// </summary>
18 /// <param name="x">左上角的横坐标</param>
19 /// <param name="y">左上角的纵坐标</param>
20 /// <param name="width">抓取宽度</param>
21 /// <param name="height">抓取高度</param>
22 /// <returns></returns>
23 public static Bitmap captureScreen(int x, int y, int width, int height)
24 {
25 Bitmap bmp = new Bitmap(width, height);
26 using (Graphics g = Graphics.FromImage(bmp))
27 {
28 g.CopyFromScreen(new Point(x, y), new Point(0, 0), bmp.Size);
29 g.Dispose();
30 }
31 //bit.Save(@"capture2.png");
32 return bmp;
33 }
34
35 /// <summary>
36 /// 抓取整个屏幕
37 /// </summary>
38 /// <returns></returns>
39 public static Bitmap captureScreen()
40 {
41 Size screenSize = Screen.PrimaryScreen.Bounds.Size;
42 return captureScreen(0,0,screenSize.Width,screenSize.Height);
43 }
44 #endregion
45
46 #region 使用BitBlt方法抓取控件，无论控件是否被遮挡
47 /// <summary>
48 /// 控件(窗口)的截图，控件被其他窗口(而非本窗口内控件)遮挡时也可以正确截图，使用BitBlt方法
49 /// </summary>
50 /// <param name="control">需要被截图的控件</param>
51 /// <returns>该控件的截图，控件被遮挡时也可以正确截图</returns>
52 public static Bitmap captureControl(Control control)
53 {
54 //调用API截屏
55 IntPtr hSrce = GetWindowDC(control.Handle);
56 IntPtr hDest = CreateCompatibleDC(hSrce);
57 IntPtr hBmp = CreateCompatibleBitmap(hSrce, control.Width, control.Height);
58 IntPtr hOldBmp = SelectObject(hDest, hBmp);
59 if (BitBlt(hDest, 0, 0, control.Width, control.Height, hSrce, 0, 0, CopyPixelOperation.SourceCopy | CopyPixelOperation.CaptureBlt))
60 {
61 Bitmap bmp = Image.FromHbitmap(hBmp);
62 SelectObject(hDest, hOldBmp);
63 DeleteObject(hBmp);
64 DeleteDC(hDest);
65 ReleaseDC(control.Handle, hSrce);
66 // bmp.Save(@"a.png");
67 // bmp.Dispose();
68 return bmp;
69 }
70 return null;
71
72 }
73
74 #endregion
75
76
77 #region 使用PrintWindow方法抓取窗口，无论控件是否被遮挡
78 /// <summary>
79 /// 窗口的截图，窗口被遮挡时也可以正确截图，使用PrintWindow方法
80 /// </summary>
81 /// <param name="control">需要被截图的窗口</param>
82 /// <returns>窗口的截图，控件被遮挡时也可以正确截图</returns>
83 public static Bitmap captureWindowUsingPrintWindow(Form form)
84 {
85 return GetWindow(form.Handle);
86 }
87
88
89 private static Bitmap GetWindow(IntPtr hWnd)
90 {
91 IntPtr hscrdc = GetWindowDC(hWnd);
92 Control control = Control.FromHandle(hWnd);
93 IntPtr hbitmap = CreateCompatibleBitmap(hscrdc, control.Width, control.Height);
94 IntPtr hmemdc = CreateCompatibleDC(hscrdc);
95 SelectObject(hmemdc, hbitmap);
96 PrintWindow(hWnd, hmemdc, 0);
97 Bitmap bmp = Bitmap.FromHbitmap(hbitmap);
98 DeleteDC(hscrdc);//删除用过的对象
99 DeleteDC(hmemdc);//删除用过的对象
100 return bmp;
101 }
102 #endregion
103
104 #region DLL calls
105 [DllImport("gdi32.dll")]
106 static extern bool BitBlt(IntPtr hdcDest, int xDest, int yDest, int
107 wDest, int hDest, IntPtr hdcSource, int xSrc, int ySrc, CopyPixelOperation rop);
108 [DllImport("gdi32.dll")]
109 static extern IntPtr DeleteDC(IntPtr hDc);
110 [DllImport("gdi32.dll")]
111 static extern IntPtr DeleteObject(IntPtr hDc);
112 [DllImport("gdi32.dll")]
113 static extern IntPtr CreateCompatibleBitmap(IntPtr hdc, int nWidth, int nHeight);
114 [DllImport("gdi32.dll")]
115 static extern IntPtr CreateCompatibleDC(IntPtr hdc);
116 [DllImport("gdi32.dll")]
117 static extern IntPtr SelectObject(IntPtr hdc, IntPtr bmp);
118 [DllImport("user32.dll")]
119 public static extern IntPtr GetDesktopWindow();
120 [DllImport("user32.dll")]
121 public static extern IntPtr GetWindowDC(IntPtr ptr);
122 [DllImport("user32.dll")]
123 public static extern bool PrintWindow(IntPtr hwnd, IntPtr hdcBlt, UInt32 nFlags);
124 [DllImport("user32.dll")]
125 static extern bool ReleaseDC(IntPtr hWnd, IntPtr hDc);
126 #endregion
127 }
128 }
