文件操作

 1 // 释放【BMP文件】到指定的文件夹
 2 BOOL ReleaseBMPRes(LPCTSTR szDLLFullPath, UINT uResID, LPCTSTR szResType)
 3 {
 4     if (uResID<=0 || !szResType)
 5     {
 6         return FALSE;
 7     }
 8 
 9     HRSRC hRsrc = FindResource(NULL, MAKEINTRESOURCE(uResID), szResType);
10     if ( NULL == hRsrc )
11     {
12         return FALSE;
13     }
14 
15     DWORD dwSize = SizeofResource(NULL, hRsrc);
16     if ( dwSize <= 0)
17     {
18         return FALSE;
19     }
20 
21     HGLOBAL hGlobal = LoadResource(NULL, hRsrc);
22     if ( NULL == hGlobal )
23     {
24         return FALSE;
25     }
26 
27     LPVOID pBuffer = LockResource(hGlobal);
28     if ( NULL ==pBuffer )
29     {
30         return FALSE;
31     }
32 
33     DWORD dwWritten = 0;
34     HANDLE hFile = CreateFile(szDLLFullPath, GENERIC_READ|GENERIC_WRITE, 0, NULL, OPEN_ALWAYS, FILE_ATTRIBUTE_NORMAL, NULL);
35     if (INVALID_HANDLE_VALUE == hFile )
36     {
37         return FALSE;
38     }
39     if (szResType = RT_BITMAP)
40     {
41         // 获得位图信息头
42         BITMAPINFOHEADER    bmpInfoHeader;
43         CopyMemory(&bmpInfoHeader, pBuffer, sizeof(BITMAPINFOHEADER));
44 
45         //获得位图颜色表中的RGBQUAD结构个数
46         long nColorEntries;
47         switch(bmpInfoHeader.biBitCount)
48         {
49         case 1:
50             nColorEntries = 2;
51             break;
52         case 4:
53             nColorEntries = 16;
54             break;
55         case 8:
56             nColorEntries = 256;
57             break;
58         default:
59             nColorEntries = 0;
60             break;
61         }
62 
63         // 根据位图信息头创建位图文件头
64         BITMAPFILEHEADER    bmpFileHeader;
65         bmpFileHeader.bfType = 0x4d42;　　// "BM"
66         bmpFileHeader.bfSize = sizeof(BITMAPFILEHEADER) + dwSize;
67         bmpFileHeader.bfReserved1 = bmpFileHeader.bfReserved2 = 0;
68         bmpFileHeader.bfOffBits = sizeof(BITMAPFILEHEADER) + sizeof(BITMAPINFOHEADER) + sizeof(RGBQUAD);
69 
70         // 写入位图文件头
71         WriteFile(hFile, &bmpFileHeader, sizeof(BITMAPFILEHEADER), &dwWritten, NULL);
72     }
73     
74 
75     if (FALSE == WriteFile(hFile, pBuffer, dwSize, &dwWritten, NULL))
76     {
77         AfxMessageBox(_T("写入失败!"));
78         return FALSE;
79     }
80 
81     CloseHandle(hFile);
82     UnlockResource(hGlobal);
83     FreeResource(hGlobal);    
84     return TRUE;
85 }