FILETIME, SYSTEMTIME 与 time_t 相互转换

FILETIME, SYSTEMTIME 与 time_t 相互转换

2009-08-24 15:37:14| 分类： 默认分类|举报|字号 订阅

//************************************************************
//FILETIME, SYSTEMTIME 与 time_t 相互转换

//#####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#####

//#### Time_tToSystemTime ####
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 );
}

//#### SystemTimeToTime_t ####
void SystemTimeToTime_t( 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);
}
//********************************************************************/