C# Signature:
[DllImport("kernel32.dll")]
static extern bool DosDateTimeToFileTime(ushort wFatDate, ushort wFatTime,
out UFILETIME lpFileTime);
User-Defined Types:
public struct UFILETIME
{
public uint dwLowDateTime;
public uint dwHighDateTime;
}
Notes:
Sample and signature code originally used System.Runtime.InteropServices.FILETIME, but this uses ints instead of uints (DWORDs) meaning that this line:
long hFT2 = (((long) ft.dwHighDateTime) << 32) + ft.dwLowDateTime;
gave incorrect results due to signs.
Tips & Tricks:
Please add some!
Alternate C# process:
[DllImport("kernel32", CallingConvention = CallingConvention.StdCall, SetLastError = true)]
private static extern int DosDateTimeToFileTime(ushort dateValue, ushort timeValue, out UInt64 fileTime);
[DllImport("kernel32", CallingConvention = CallingConvention.StdCall, SetLastError = true)]
private static extern int FileTimeToDosDateTime(ref UInt64 fileTimeInfo, out ushort dateValue, out ushort TimeValue);
void Test()
{
UInt64 data = Convert.ToUInt64(DateTime.Now.ToFileTime());
int result = 0;
ushort dateValue = 0;
ushort timeValue = 0;
result = FileTimeToDosDateTime(ref data, out dateValue, out timeValue);
data = 0;
result = DosDateTimeToFileTime(dateValue, timeValue, out data);
Console.Write(DateTime.FromFileTime(Convert.ToInt64(data)).ToString("MM/dd/yyyy hh:mm:ss tt"));
}
Sample Code:
public struct UFILETIME
{
public uint dwLowDateTime;
public uint dwHighDateTime;
}
private static DateTime ConvertDosDateTime(ushort DosDate, ushort DosTime)
{
UFILETIME filetime = new UFILETIME();
DosDateTimeToFileTime(DosDate, DosTime, out filetime);
//Reference: http://www.aspemporium.com/howto.aspx?hid=26
long longfiletime = (long)(((ulong)filetime.dwHighDateTime << 32) +
(ulong)filetime.dwLowDateTime);
return DateTime.FromFileTimeUtc(longfiletime);
}
Alternative Managed API:
Do you know one? Please contribute it!
