ILETIME, SYSTEMTIME 與 time_t 相互轉換
#####SYSTEMTIME 與 FILETIME相互轉換#####
可以使用系統函數
FileTimeToSystemTime(&ftcreate,&stcreate);
參數:
(lpFileTime As FILETIME, lpSystemTime As SYSTEMTIME)
說明
根據一個FILETIME結構的內容,裝載一個SYSTEMTIME結構
返回值
Long,非零表示成功,零表示失敗。會設置GetLastError
參數表
參數 類型及說明
lpFileTime FILETIME,包含了文件時間的一個結構
lpSystemTime SYSTEMTIME,用於裝載系統時間信息的一個結構
#####SYSTEMTIME 與 time_t相互轉換#####
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);
}