1 // GetFileSpaceSize.cpp : Defines the entry point for the console application. 2 // 3 /************************************************************************ 4 * author: HwangBae 5 * created: 2012/07/21 6 * Blog: http://hwangbae.cnblogs.com/ 7 * Email: hwangbae@live.cn 8 ************************************************************************/ 9 10 #include <windows.h> 11 #include <tchar.h> 12 #include <stdio.h> 13 #include <math.h> 14 15 16 int _tmain(int argc, _TCHAR* argv[]) 17 { 18 if (argc < 2) 19 { 20 _tprintf_s(_T("Usage: GetFileSpaceSize filename ")); 21 return -1; 22 } 23 24 // 文件路径 25 LPCTSTR szFileName = argv[1]; 26 27 // 打开文件句柄 28 HANDLE hFile = ::CreateFile(szFileName, GENERIC_READ | FILE_SHARE_READ, 0, 29 NULL, OPEN_EXISTING, FILE_ATTRIBUTE_NORMAL, NULL); 30 if (hFile == INVALID_HANDLE_VALUE) 31 { 32 _tprintf_s(_T("Failed to create file handle: %s ! error code:%d "), szFileName, GetLastError()); 33 return -1; 34 } 35 36 // 获取文件大小 37 UINT64 uFileSize = 0; 38 ::GetFileSizeEx(hFile, reinterpret_cast<PLARGE_INTEGER>(&uFileSize)); 39 ::CloseHandle(hFile); 40 41 // 获取磁盘根路径 42 TCHAR szVolumePathName[] = _T("C:\"); 43 ::GetVolumePathName(szFileName, szVolumePathName, sizeof(szVolumePathName) / sizeof(TCHAR)); 44 45 // 保存簇信息的变量 46 DWORD dwSectorsPerCluster = 0; 47 DWORD dwBytesPerSector = 0; 48 DWORD dwNumberOfFreeClusters = 0; 49 DWORD dwTotalNumberOfClusters = 0; 50 51 // 获取簇信息 52 if (!::GetDiskFreeSpace( 53 szVolumePathName, //磁盘根路径 54 &dwSectorsPerCluster, //每簇的扇区数 55 &dwBytesPerSector, //每扇区的字节数 56 &dwNumberOfFreeClusters, //空余簇的数量 57 &dwTotalNumberOfClusters //全部簇的数量 58 ) 59 ) 60 { 61 _tprintf_s(_T("Failed to get disk cluster info! error code: %d "), GetLastError()); 62 return -1; 63 } 64 // 簇大小 = 每簇的扇区数 * 每扇区的字节数 65 DWORD dwClusterSize = dwSectorsPerCluster * dwBytesPerSector; 66 67 // 计算文件占用空间 68 // 公式:(以字节为单位) 69 // 簇数 = 向上取整(文件大小 / 簇大小) 70 // 占用空间 = 簇数 * 簇大小 71 UINT64 dwFileSpacesize = static_cast<UINT64>(ceil(uFileSize / static_cast<double>(dwClusterSize)) * dwClusterSize); 72 73 _tprintf_s(_T("FileName : %s "), szFileName); 74 _tprintf_s(_T("FileSize : %I64u Byte "), uFileSize); 75 _tprintf_s(_T("FileSpacesSize : %I64u Byte "), dwFileSpacesize); 76 return 0; 77 }
方法二：
1 // GetFileSpaceSize.cpp : Defines the entry point for the console application. 2 // 3 /************************************************************************ 4 * author: HwangBae 5 * created: 2012/07/23 6 * Blog: http://hwangbae.cnblogs.com/ 7 * Email: hwangbae@live.cn 8 ************************************************************************/ 9 10 #include <windows.h> 11 #include <tchar.h> 12 #include <stdio.h> 13 14 #define CLOSE_HANDLE(handle) 15 do 16 { 17 CloseHandle(handle); 18 handle = NULL; 19 } while (FALSE) 20 21 int _tmain(int argc, _TCHAR* argv[]) 22 { 23 if (argc < 2) 24 { 25 _tprintf_s(_T("Usage: GetFileSpaceSize filename ")); 26 return -1; 27 } 28 29 // 文件路径 30 LPCTSTR szFileName = argv[1]; 31 32 // 打开文件句柄 33 HANDLE hFile = ::CreateFile(szFileName, GENERIC_READ | FILE_SHARE_READ, 0, 34 NULL, OPEN_EXISTING, FILE_ATTRIBUTE_NORMAL, NULL); 35 if (hFile == INVALID_HANDLE_VALUE) 36 { 37 _tprintf_s(_T("Failed to create file handle: %s ! error code:%d "), szFileName, GetLastError()); 38 return -1; 39 } 40 41 // 获取文件大小 42 UINT64 uFileSize = 0; 43 ::GetFileSizeEx(hFile, reinterpret_cast<PLARGE_INTEGER>(&uFileSize)); 44 45 FILE_STANDARD_INFO fsi = {0}; 46 if (!::GetFileInformationByHandleEx(hFile, FileStandardInfo, &fsi, sizeof(FILE_STANDARD_INFO))) 47 { 48 _tprintf_s(_T("Failed to get file info! error code:%d "), GetLastError()); 49 CLOSE_HANDLE(hFile); 50 return -1; 51 } 52 53 _tprintf_s(_T("FileName : %s "), szFileName); 54 _tprintf_s(_T("FileSize : %I64u Byte "), uFileSize); 55 _tprintf_s(_T("FileSpacesSize : %I64u Byte "), fsi.AllocationSize); 56 CLOSE_HANDLE(hFile); 57 return 0; 58 }
转载：http://www.cnblogs.com/hwangbae/archive/2012/07/21/2602592.html