/// <summary>
/// Helper routine to get a DateTime from a FILETIME.
/// </summary>
/// <param name="ft"></param>
/// <returns></returns>
public static DateTime FromFileTime(Win32API.FILETIME ft)
{
if (ft.dwHighDateTime == Int32.MaxValue || (ft.dwLowDateTime == 0 && ft.dwHighDateTime == 0))
{
// Not going to fit in the DateTime. In the WinInet APIs, this is
// what happens when there is no FILETIME attached to the cache entry.
// We're going to use DateTime.MinValue as a marker for this case.
return(DateTime.MinValue);
}
Win32API.SYSTEMTIME syst = new Win32API.SYSTEMTIME();
Win32API.SYSTEMTIME systLocal = new Win32API.SYSTEMTIME();
if (0 == Win32API.FileTimeToSystemTime(ref ft, ref syst))
{
throw new ApplicationException("Error calling FileTimeToSystemTime: " + Marshal.GetLastWin32Error());
}
if (0 == Win32API.SystemTimeToTzSpecificLocalTime(IntPtr.Zero, ref syst, out systLocal))
{
throw new ApplicationException("Error calling SystemTimeToTzSpecificLocalTime: " + Marshal.GetLastWin32Error());
}
return(new DateTime(systLocal.Year, systLocal.Month, systLocal.Day, systLocal.Hour, systLocal.Minute, systLocal.Second));
}
/// <summary>
/// Helper routine to get a DateTime from a FILETIME.
/// </summary>
/// <param name="ft"></param>
/// <returns></returns>
public static DateTime FromFileTime( Win32API.FILETIME ft )
{
if( ft.dwHighDateTime == Int32.MaxValue || (ft.dwLowDateTime == 0 && ft.dwHighDateTime == 0) )
{
// Not going to fit in the DateTime. In the WinInet APIs, this is
// what happens when there is no FILETIME attached to the cache entry.
// We're going to use DateTime.MinValue as a marker for this case.
return DateTime.MinValue;
}
Win32API.SYSTEMTIME syst = new Win32API.SYSTEMTIME();
Win32API.SYSTEMTIME systLocal = new Win32API.SYSTEMTIME();
if( 0 == Win32API.FileTimeToSystemTime( ref ft, ref syst ) )
{
throw new ApplicationException( "Error calling FileTimeToSystemTime: " + Marshal.GetLastWin32Error() );
}
if( 0 == Win32API.SystemTimeToTzSpecificLocalTime( IntPtr.Zero, ref syst, out systLocal ) )
{
throw new ApplicationException( "Error calling SystemTimeToTzSpecificLocalTime: " + Marshal.GetLastWin32Error() );
}
return new DateTime( systLocal.Year, systLocal.Month, systLocal.Day, systLocal.Hour, systLocal.Minute, systLocal.Second );
}
