C++ 文件大小格式化

 #include <iostream>
 #include <windows.h>
 using namespace std;

 /*文件大小格式化
  *param [in] dwSize   xx.xxB 、xx.xxKb 、xx.xxM
  */

 LPCTSTR CFileUtil::FileSizeToFormat(DWORD dwSize)
 {
     TCHAR* strSize = new TCHAR[];
     ZeroMemory(strSize,sizeof(TCHAR) * );

     double i = pow((double),);

     if (dwSize < pow((double),))//dwSize < 1024
     {
         _stprintf_s(strSize,,TEXT("%dB"),dwSize);//文件大小 B
     }
     else if (pow((double),) <= dwSize &&  dwSize< pow((double),))// 1024 <= dwSize < 1024*1024
     {
         float fSize = (float)(dwSize*/)/;
         _stprintf_s(strSize,,TEXT("%.2fKB"),fSize);
     }
     else if (pow((double),) <= dwSize && dwSize < pow((double),))// 1024*1024 <= dwSize < 1024*1024*1024
     {
         float fSize = (float)(dwSize/*/)/;
         _stprintf_s(strSize,,TEXT("%.2fM"),fSize);//文件大小 M
     }
     else if (pow((double),) <= dwSize && dwSize < pow((double),)) // 1024*1024*1024 <= dwSize < 1024*1024*1024*1024
     {
         float fSize = (float)(dwSize/*//)/;
         _stprintf_s(strSize,,TEXT("%.2fG"),fSize);//文件大小 G
     }
     else
     {
         float fSize = (float)(dwSize/*///)/;
         _stprintf_s(strSize,,TEXT("%.2fT"),fSize);//文件大小 T
     }

     return strSize;
 }

 /*根据文件大小进行格式化
 *@[in ]  llBytes    文件的长度(B)
 *@[out]  pszSize    缓冲区
 *@[in ]  clen       缓冲区长度
 */

 BOOL FileSizeToStringA(LONGLONG llBytes, char* pszSize, DWORD cLen)
 {
     double bytes = (double)llBytes;
     DWORD cIter = ;
     char* pszUnits[] = { ("B"), ("KB"), ("MB"), ("GB"), ("TB") };
     DWORD cUnits = sizeof(pszUnits) / sizeof(pszUnits[]);

     // move from bytes to KB, to MB, to GB and so on diving by 1024
     while(bytes >=  && cIter < (cUnits-))
     {
         bytes /= ;
         cIter++;
     }
     _snprintf_s(pszSize, cLen, _TRUNCATE,("%.2f %s"), bytes, pszUnits[cIter]);
     return TRUE;
 }

 int main()
 {
     char szText[];
     FileSizeToStringA(,szText,);

     cout << "szText:" << szText << endl;

     getchar();
     return ;
 }