using System;
  2using System.Runtime.InteropServices;
  3using System.Drawing;
  4using System.Drawing.Imaging;
  5
  6namespace ScreenShotDemo
  7{
  8 /**//// <summary>
  9 /// 提供捕获全屏或者一个不规则窗口函数，并保存。
10 /// </summary>
11 public class ScreenCapture
12 {
13        /**//// <summary>
14        /// Creates an Image object containing a screen shot of the entire desktop?
15        /// </summary>
16        /// <returns></returns>
17        public Image CaptureScreen()
18        {
19            return CaptureWindow( User32.GetDesktopWindow() );
20        }
21
22        /**//// <summary>
23        /// Creates an Image object containing a screen shot of a specific window?
24        /// </summary>
25        /// <param name="handle">The handle to the window. (In windows forms, this is obtained by the Handle property)</param>
26        /// <returns></returns>
27        public Image CaptureWindow(IntPtr handle)
28        {
29            // get te hDC of the target window
30            IntPtr hdcSrc = User32.GetWindowDC(handle);
31            // get the size
32            User32.RECT windowRect = new User32.RECT();
33            User32.GetWindowRect(handle,ref windowRect);
34            int width = windowRect.right - windowRect.left;
35            int height = windowRect.bottom - windowRect.top;
36            // create a device context we can copy to
37            IntPtr hdcDest = GDI32.CreateCompatibleDC(hdcSrc);
38            // create a bitmap we can copy it to,
39            // using GetDeviceCaps to get the width/height
40            IntPtr hBitmap = GDI32.CreateCompatibleBitmap(hdcSrc,width,height);
41            // select the bitmap object
42            IntPtr hOld = GDI32.SelectObject(hdcDest,hBitmap);
43            // bitblt over
44            GDI32.BitBlt(hdcDest,0,0,width,height,hdcSrc,0,0,GDI32.SRCCOPY);
45            // restore selection
46            GDI32.SelectObject(hdcDest,hOld);
47            // clean up
48            GDI32.DeleteDC(hdcDest);
49            User32.ReleaseDC(handle,hdcSrc);
50
51            // get a .NET p_w_picpath object for it
52            Image img = Image.FromHbitmap(hBitmap);
53            // free up the Bitmap object
54            GDI32.DeleteObject(hBitmap);
55
56            return img;
57        }
58
59        /**//// <summary>
60        /// Captures a screen shot of a specific window, and saves it to a file?
61        /// </summary>
62        /// <param name="handle"></param>
63        /// <param name="filename"></param>
64        /// <param name="format"></param>
65        public void CaptureWindowToFile(IntPtr handle, string filename, ImageFormat format)
66        {
67            Image img = CaptureWindow(handle);
68            img.Save(filename,format);
69        }
70
71        /**//// <summary>
72        /// Captures a screen shot of the entire desktop, and saves it to a file?
73        /// </summary>
74        /// <param name="filename"></param>
75        /// <param name="format"></param>
76        public void CaptureScreenToFile(string filename, ImageFormat format)
77        {
78            Image img = CaptureScreen();
79            img.Save(filename,format);
80        }
81      
82        /**//// <summary>
83        /// Helper class containing Gdi32 API functions
84        /// </summary>
85        private class GDI32
86        {
87           
88            public const int SRCCOPY = 0x00CC0020; // BitBlt dwRop parameter
89
90            [DllImport("gdi32.dll")]
91            public static extern bool BitBlt(IntPtr hObject,int nXDest,int nYDest,
92                int nWidth,int nHeight,IntPtr hObjectSource,
93                int nXSrc,int nYSrc,int dwRop);
94            [DllImport("gdi32.dll")]
95            public static extern IntPtr CreateCompatibleBitmap(IntPtr hDC,int nWidth,
96                int nHeight);
97            [DllImport("gdi32.dll")]
98            public static extern IntPtr CreateCompatibleDC(IntPtr hDC);
99            [DllImport("gdi32.dll")]
100            public static extern bool DeleteDC(IntPtr hDC);
101            [DllImport("gdi32.dll")]
102            public static extern bool DeleteObject(IntPtr hObject);
103            [DllImport("gdi32.dll")]
104            public static extern IntPtr SelectObject(IntPtr hDC,IntPtr hObject);
105        }
106
107        /**//// <summary>
108        /// Helper class containing User32 API functions
109        /// </summary>
110        private class User32
111        {
112            [StructLayout(LayoutKind.Sequential)]
113            public struct RECT
114            {
115                public int left;
116                public int top;
117                public int right;
118                public int bottom;
119            }
120
121            [DllImport("user32.dll")]
122            public static extern IntPtr GetDesktopWindow();
123            [DllImport("user32.dll")]
124            public static extern IntPtr GetWindowDC(IntPtr hWnd);
125            [DllImport("user32.dll")]
126            public static extern IntPtr ReleaseDC(IntPtr hWnd,IntPtr hDC);
127            [DllImport("user32.dll")]
128            public static extern IntPtr GetWindowRect(IntPtr hWnd,ref RECT rect);
129
130        }
131
132
133 }
134}
135
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