pinvoke.net: Edit: Structures.FileTime

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Summary: FILETIME

!!!!C# Definition:
 [StructLayout(LayoutKind.Sequential)]
 public struct FILETIME {
    public uint DateTimeLow;
    public uint DateTimeHigh;
 }
!!!!VB.Net Definition:
 <StructLayout(LayoutKind.Sequential)> _
 Public Structure FILETIME
   Public dwLowDateTime As UInteger
   Public dwHighDateTime As UInteger
 
   Public ReadOnly Property Value() As ULong
     Get
       Return CType(dwHighDateTime << 32, ULong) + dwLowDateTime
     End Get
   End Property
 End Structure
!!!!Alternative Managed Definition:
System.Runtime.InteropServices.FILETIME@msdn (obsolete), or System.Runtime.InteropServices.ComTypes.FILETIME@msdn in the .NET Framework 2.0.

!!!!Notes:
None.

!!!!Sample Code:

There is no reason not to use System.Runtime.InteropServices.ComTypes.FILETIME@msdn, but there still is a need for conversion to DateTime@msdn:

C#
	public static DateTime FiletimeToDateTime(FILETIME fileTime) {
		long hFT2 = (((long) fileTime.dwHighDateTime) << 32) | ((uint) fileTime.dwLowDateTime);
		return DateTime.FromFileTimeUtc(hFT2);
	}

public static FILETIME DateTimeToFiletime(DateTime time) {
		FILETIME ft;
		long hFT1 = time.ToFileTimeUtc();
		ft.dwLowDateTime = (int) (hFT1 & 0xFFFFFFFF);
		ft.dwHighDateTime = (int) (hFT1 >> 32);
		return ft;
	}

Actually, this is NOT working. The only solution I've found so far is using the API Kernel32.dll function FileTimeToSystemTime, then transforming from that into a regular DateTime.

The reason it was not working, is the + operator between "((long) high) << 32" and "low". I changed this to the | operator.

* Note that System.Runtime.InteropServices.FILETIME is now obsolete. Changed to use System.Runtime.InteropServices.ComTypes.FILETIME instead.

This works for me in vb.net:

Private Shared Function ConvertFileTimeToDateTime(input As FILETIME) As DateTime
        Dim longTime As ULong = (CType(input.dwHighDateTime, ULong) << 32) Or input.dwLowDateTime
        Return DateTime.FromFileTime(longTime)
    End Function

---

Completely without any error-prone bit shift operations:

C#
	[StructLayout(LayoutKind.Sequential)]
	struct FILETIME {
		private long timestamp;
		public DateTime Local { 
			get { return DateTime.FromFileTime(this.timestamp); }
			set { this.timestamp = value.ToFileTime(); }
		}
		public DateTime Utc { 
			get { return DateTime.FromFileTimeUtc(this.timestamp); }
			set { this.timestamp = value.ToFileTimeUtc(); }
		}
	}

Documentation: FILETIME@msdn on MSDN