C++ 文件大小格式化

 1 #include <iostream>
 2 #include <windows.h>
 3 using namespace std;
 4 
 5 
 6 /*根据文件大小进行格式化
 7 *@[in ]  llBytes    文件的长度(B)
 8 *@[out]  pszSize    缓冲区
 9 *@[in ]  clen       缓冲区长度
10 */
11 
12 BOOL FileSizeToStringA(LONGLONG llBytes, char* pszSize, DWORD cLen)
13 {
14     double bytes = (double)llBytes;
15     DWORD cIter = 0;    
16     char* pszUnits[] = { ("B"), ("KB"), ("MB"), ("GB"), ("TB") };
17     DWORD cUnits = sizeof(pszUnits) / sizeof(pszUnits[0]);
18 
19     // move from bytes to KB, to MB, to GB and so on diving by 1024
20     while(bytes >= 1024 && cIter < (cUnits-1))
21     {
22         bytes /= 1024;
23         cIter++;
24     }
25     _snprintf_s(pszSize, cLen, _TRUNCATE,("%.2f %s"), bytes, pszUnits[cIter]);
26     return TRUE;
27 }
28 
29 int main()
30 {
31     char szText[256];
32     FileSizeToStringA(23156,szText,256);
33 
34     cout << "szText:" << szText << endl;
35 
36     getchar();
37     return 0;
38 }