两个FILETIME, SYSTEMTIME 与 time_t 相互转换

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

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

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