Window screenshot (can specify HWND window handle) (three articles)

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2. BOOL Savehwndtobmpfile (hwnd hwnd, LPCTSTR lpszpath)
4. {
6. HWND hdesktop =:: GetDesktopWindow ();
8. ASSERT (Hdesktop);
10. if (NULL = = hWnd)
12. {
14. HWnd = Hdesktop;
16. }
18. Rect rect;
20. :: GetWindowRect (HWnd, &rect);
24. int nwidht = Rect.right-rect.left;
26. int nheight = rect.bottom-rect.top;
30. HDC HSRCDC =:: GETWINDOWDC (HWND);
32. ASSERT (HSRCDC);
34. HDC HMEMDC =:: CreateCompatibleDC (HSRCDC);
36. ASSERT (HMEMDC);
38. hbitmap hbitmap =:: CreateCompatibleBitmap (HSRCDC, NWIDHT, nheight);
40. ASSERT (HBITMAP);
42. hbitmap holdbitmap = (hbitmap):: SelectObject (HMEMDC, HBITMAP);
44. :: BitBlt (HMEMDC, 0, 0, NWIDHT, nheight, HSRCDC, 0, 0, srccopy);
48. BITMAP BITMAP = {0};
50. :: GetObject (Hbitmap, sizeof (BITMAP), &bitmap);
52. Bitmapinfoheader bi = {0};
54. Bitmapfileheader bf = {0};
58. CONST int nbitcount = 24;
60. Bi.bisize = sizeof (bitmapinfoheader);
62. Bi.biwidth = Bitmap.bmwidth;
64. Bi.biheight = Bitmap.bmheight;
66. Bi.biplanes = 1;
68. Bi.bibitcount = Nbitcount;
70. Bi.bicompression = Bi_rgb;
72. DWORD dwsize = ((Bitmap.bmwidth * nbitcount + +)/+) * 4 * bitmap.bmheight;
76. HANDLE Hdib = GlobalAlloc (ghnd, dwsize + sizeof (bitmapinfoheader));
78. Lpbitmapinfoheader LPBI = (lpbitmapinfoheader) globallock (HDIB);
80. *LPBI = bi;
84. :: GetDIBits (HMEMDC, hbitmap, 0, Bitmap.bmheight, (byte*) LPBI + sizeof (Bitmapinfoheader), (bitmapinfo*) LPBI,  Dib_rgb_colors);
88. Try
90. {
92. CFile file;
94. File. Open (Lpszpath, Cfile::modecreate | Cfile::modewrite);
96. Bf.bftype = 0x4d42;
98. dwsize + = sizeof (bitmapfileheader) + sizeof (bitmapinfoheader);
100. Bf.bfsize = dwsize;
102. Bf.bfoffbits = sizeof (bitmapfileheader) + sizeof (bitmapinfoheader);
106. File.  Write ((byte*) &BF, sizeof (Bitmapfileheader));
108. File.  Write ((byte*) LPBI, dwsize);
110. File. Close ();
112. }
114. catch (cfileexception* e)
116. {
118. E->reporterror ();
120. E->delete ();
122. }
126. GlobalUnlock (HDIB);
128. GlobalFree (HDIB);
132. :: SelectObject (HMEMDC, Holdbitmap);
134. ::D eleteobject (HBITMAP);
136. ::D Eletedc (HMEMDC);
138. :: ReleaseDC (HWnd, HSRCDC);
142. return TRUE;
144. }
148. Calling methods
150. HWND hwnd =:: FindWindow (NULL, _t ("XXX"));
152. if (hWnd)
154. {
156. Savehwndtobmpfile (HWnd, _t ("f://12.bmp"));
158. }

http://blog.csdn.net/visualeleven/article/details/6202796

http://blog.csdn.net/visualeleven/article/details/6206715

http://blog.csdn.net/visualeleven/article/details/6093484

Window (can specify the HWND window handle) (three articles)