1 public static Bitmap GetDesktopWindowCaptureAsBitmap()
2 {
3 Rectangle rcScreen = Rectangle.Empty;
4 Screen[] screens = Screen.AllScreens;
5
6
7 // Create a rectangle encompassing all screens...
8 foreach(Screen screen in screens)
9 rcScreen = Rectangle.Union(rcScreen, screen.Bounds);
10
11 // Create a composite bitmap of the size of all screens...
12 Bitmap finalBitmap = new Bitmap(rcScreen.Width, rcScreen.Height);
13
14 // Get a graphics object for the composite bitmap and initialize it...
15 Graphics g = Graphics.FromImage(finalBitmap);
16 g.CompositingQuality = System.Drawing.Drawing2D.CompositingQuality.HighSpeed;
17 g.FillRectangle(
18 SystemBrushes.Desktop,
19 0,
20 0,
21 rcScreen.Width - rcScreen.X,
22 rcScreen.Height - rcScreen.Y);
23
24 // Get an HDC for the composite area...
25 IntPtr hdcDestination = g.GetHdc();
26
27 // Now, loop through screens,
28 // Blting each to the composite HDC created above...
29 foreach(Screen screen in screens)
30 {
31 // Create DC for each source monitor...
32 IntPtr hdcSource = Win32.CreateDC(
33 IntPtr.Zero,
34 screen.DeviceName,
35 IntPtr.Zero,
36 IntPtr.Zero);
37
38 // Blt the source directly to the composite destination...
39 int xDest = screen.Bounds.X - rcScreen.X;
40 int yDest = screen.Bounds.Y - rcScreen.Y;
41
42 bool success = Win32.StretchBlt(
43 hdcDestination,
44 xDest,
45 yDest,
46 screen.Bounds.Width,
47 screen.Bounds.Height,
48 hdcSource,
49 0,
50 0,
51 screen.Bounds.Width,
52 screen.Bounds.Height,
53 (int)Win32.TernaryRasterOperations.SRCCOPY);
54
55 // System.Diagnostics.Trace.WriteLine(screen.Bounds);
56
57 if (!success)
58 {
59 System.ComponentModel.Win32Exception win32Exception =
60 new System.ComponentModel.Win32Exception();
61 System.Diagnostics.Trace.WriteLine(win32Exception);
62 }
63
64 // Cleanup source HDC...
65 Win32.DeleteDC(hdcSource);
66 }
67
68 // Cleanup destination HDC and Graphics...
69 g.ReleaseHdc(hdcDestination);
70 g.Dispose();
71
72 // IntPtr hDC = GetDC(IntPtr.Zero);
73 // Graphics gDest = Graphics.FromHdc(hDC);
74 // gDest.DrawImage(finalBitmap, 0, 0, 640, 480);
75 // gDest.Dispose();
76 // ReleaseDC(IntPtr.Zero, hDC);
77
78 // Return composite bitmap which will become our Form's PictureBox's image...
79 return finalBitmap;
80
81 }
82
