两个FILETIME, SYSTEMTIME 与 time_t 相互转换

àì夳堔傛蜴生んèń 2023-10-09 12:22 3阅读 0赞

## 两个FILETIME, SYSTEMTIME 与 time\_t 相互转换 ##

注意：

如果使用struct tm 通过 localtime和mktime做转换，需注意时区的问题！！！！！！

**第一个**

void TimetToSystemTime( time\_t t, LPSYSTEMTIME pst )  
\{  
FILETIME ft;

LONGLONG ll = Int32x32To64(t, 10000000) + 116444736000000000;  
ft.dwLowDateTime = (DWORD) ll;  
ft.dwHighDateTime = (DWORD)(ll >> 32);

FileTimeToSystemTime( &ft, pst );  
\}

void SystemTimeToTimet( SYSTEMTIME st, time\_t \*pt )  
\{  
FILETIME ft;  
SystemTimeToFileTime( &st, &ft );

LONGLONG ll;

ULARGE\_INTEGER ui;  
ui.LowPart = ft.dwLowDateTime;  
ui.HighPart = ft.dwHighDateTime;

ll = (ft.dwHighDateTime << 32) + ft.dwLowDateTime;

\*pt = (DWORD)((LONGLONG)(ui.QuadPart - 116444736000000000) / 10000000);  
\}

本文来自CSDN博客，转载请标明出处：[http://blog.csdn.net/modena/archive/2005/01/13/251653.aspx][http_blog.csdn.net_modena_archive_2005_01_13_251653.aspx]

**第二个**

\#\#\#\#\#SYSTEMTIME 与 FILETIME相互转换\#\#\#\#\#  
可以使用系统函数  
FileTimeToSystemTime(&ftcreate,&stcreate);

参数：  
(lpFileTime As FILETIME, lpSystemTime As SYSTEMTIME)  
说明  
根据一个FILETIME结构的内容，装载一个SYSTEMTIME结构  
返回值  
Long，非零表示成功，零表示失败。会设置GetLastError  
参数表  
参数 类型及说明  
lpFileTime FILETIME，包含了文件时间的一个结构  
lpSystemTime SYSTEMTIME，用于装载系统时间信息的一个结构

\#\#\#\#\#SYSTEMTIME 与 time\_t相互转换\#\#\#\#\#

void TimetToSystemTime( time\_t t, LPSYSTEMTIME pst )  
\{  
FILETIME ft;  
LONGLONG ll = Int32x32To64(t, 10000000) + 116444736000000000;  
ft.dwLowDateTime = (DWORD) ll;  
ft.dwHighDateTime = (DWORD)(ll >> 32);

FileTimeToSystemTime( &ft, pst );  
\}

void SystemTimeToTimet( SYSTEMTIME st, time\_t \*pt )  
\{  
FILETIME ft;  
SystemTimeToFileTime( &st, &ft );

LONGLONG ll;

ULARGE\_INTEGER ui;  
ui.LowPart = ft.dwLowDateTime;  
ui.HighPart = ft.dwHighDateTime;

ll = (ft.dwHighDateTime << 32) + ft.dwLowDateTime;

\*pt = (DWORD)((LONGLONG)(ui.QuadPart - 116444736000000000) / 10000000);  
\}

\#\#\#\# FileTimeToTime\_t \#\#\#\#

void FileTimeToTime\_t( FILETIME ft, time\_t \*t )  
\{  
LONGLONG ll;  
  
ULARGE\_INTEGER ui;  
ui.LowPart = ft.dwLowDateTime;  
ui.HighPart = ft.dwHighDateTime;  
  
ll = ft.dwHighDateTime << 32 + ft.dwLowDateTime;  
  
\*t = ((LONGLONG)(ui.QuadPart - 116444736000000000) / 10000000);  
\}

本文来自CSDN博客，转载请标明出处：[http://blog.csdn.net/zjnig711/archive/2008/04/15/2294151.aspx][http_blog.csdn.net_zjnig711_archive_2008_04_15_2294151.aspx]

[http_blog.csdn.net_modena_archive_2005_01_13_251653.aspx]: http://blog.csdn.net/modena/archive/2005/01/13/251653.aspx
[http_blog.csdn.net_zjnig711_archive_2008_04_15_2294151.aspx]: http://blog.csdn.net/zjnig711/archive/2008/04/15/2294151.aspx