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 1 BOOL SaveHwndToBmp( HWND hWnd, LPCTSTR lpszFile )
 2 {
 3     BOOL bRet;
 4     HDC hDC, hMemDC;
 5     HBITMAP hBitmap, hBitmapOld;
 6     RECT rc;
 7     int nWidth, nHeight;
 8     BITMAPINFOHEADER BitmapInfoHeader;
 9     BITMAPFILEHEADER BitmapFileHeader;
10     HANDLE hFile;
11     DWORD dwBytes;
12 
13 
14     ::GetWindowRect( hWnd, &rc );
15     nWidth = rc.right - rc.left;
16     nHeight = rc.bottom - rc.top;
17 
18     memset( &BitmapInfoHeader, 0, sizeof( BITMAPINFOHEADER ) );
19     BitmapInfoHeader.biSize = sizeof( BITMAPINFOHEADER );
20     BitmapInfoHeader.biWidth = nWidth;
21     BitmapInfoHeader.biHeight = nHeight;
22     BitmapInfoHeader.biPlanes = 1;
23     BitmapInfoHeader.biBitCount = 24;
24     BitmapInfoHeader.biCompression = BI_RGB;
25     BitmapInfoHeader.biSizeImage = ( ( ( nWidth * 24 + 31 ) & ~31 ) >> 3 ) * nHeight;
26     //BitmapInfoHeader.biXPelsPerMeter = 0;
27     //BitmapInfoHeader.biYPelsPerMeter = 0;
28     //BitmapInfoHeader.biClrUsed = 0;
29     //BitmapInfoHeader.biClrImportant = 0;
30 
31 
32     hDC = ::GetWindowDC( hWnd );
33     hMemDC = ::CreateCompatibleDC( hDC );
34     hBitmap = ::CreateCompatibleBitmap( hDC, nWidth, nHeight );
35     hBitmapOld = ( HBITMAP )::SelectObject( hMemDC, ( HGDIOBJ )hBitmap );
36 
37     if ( !::PrintWindow( hWnd, hMemDC, 0 ) )
38     {
39         bRet = FALSE;
40         goto err_exit;
41     }
42 
43     if ( ::GetDIBits( hMemDC, hBitmap, 0, nHeight, ( LPVOID )g_ImgBuff, ( LPBITMAPINFO )&BitmapInfoHeader, DIB_RGB_COLORS ) != nHeight )
44     {
45         bRet = FALSE;
46         goto err_exit;
47     }
48 
49     memset( &BitmapFileHeader, 0, sizeof( BITMAPFILEHEADER ) );
50     BitmapFileHeader.bfType = 0x4d42;
51     BitmapFileHeader.bfSize = sizeof( BITMAPFILEHEADER ) + sizeof( BITMAPINFOHEADER ) + BitmapInfoHeader.biSizeImage;
52     //BitmapFileHeader.bfReserved1 = 0;
53     //BitmapFileHeader.bfReserved2 = 0;
54     BitmapFileHeader.bfOffBits = sizeof( BITMAPFILEHEADER ) + sizeof( BITMAPINFOHEADER );
55 
56     hFile = ::CreateFile( lpszFile, GENERIC_WRITE, 0, NULL, CREATE_ALWAYS, FILE_ATTRIBUTE_NORMAL, NULL );
57     if ( hFile == INVALID_HANDLE_VALUE )
58     {
59         bRet = FALSE;
60         goto err_exit;
61     }
62 
63     bRet = ::WriteFile( hFile, &BitmapFileHeader, sizeof( BITMAPFILEHEADER ), &dwBytes, NULL );
64     if ( !bRet || dwBytes != sizeof( BITMAPFILEHEADER ) )
65     {
66         ::CloseHandle( hFile );
67         bRet = FALSE;
68         goto err_exit;
69     }
70 
71     bRet = ::WriteFile( hFile, &BitmapInfoHeader, sizeof( BITMAPINFOHEADER ), &dwBytes, NULL );
72     if ( !bRet || dwBytes != sizeof( BITMAPINFOHEADER ) )
73     {
74         ::CloseHandle( hFile );
75         bRet = FALSE;
76         goto err_exit;
77     }
78 
79     bRet = ::WriteFile( hFile, g_ImgBuff, BitmapInfoHeader.biSizeImage, &dwBytes, NULL );
80     if ( !bRet || dwBytes != BitmapInfoHeader.biSizeImage )
81     {
82         ::CloseHandle( hFile );
83         bRet = FALSE;
84         goto err_exit;
85     }
86 
87     ::CloseHandle( hFile );
88 err_exit:
89     ::SelectObject( hMemDC, ( HGDIOBJ )hBitmapOld );
90     ::DeleteObject( ( HGDIOBJ )hBitmap );
91     ::DeleteDC( hMemDC );
92     ::ReleaseDC( hWnd, hDC );
93     return bRet;
94 }

 

posted on 2013-12-16 17:34  郁郁思扬  阅读(265)  评论(0)    收藏  举报

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