I looking for way to convert COM object to DateTime
and I saw a lot of articles about this problem
(like this one -https://msdn.microsoft.com/en-us/library/ms180872(v=vs.80).aspx
and this one-
How to read "uSNChanged" property using C# )
However, all of those articles talking about using an object from the interface IADsLargeInteger
.
I tried to look for the namespace of this interface and I just couldn't find any clue.
Here is a code sample including everything you need to convert from the AD type to a DateTime:
using System.DirectoryServices;
using System.DirectoryServices.AccountManagement;
using ActiveDs; // Namespace added via ref to C:\Windows\System32\activeds.tlb
private DateTime? getLastLogin(DirectoryEntry de)
{
Int64 lastLogonThisServer = new Int64();
if (de.Properties.Contains("lastLogon"))
{
if (de.Properties["lastLogon"].Value != null)
{
try
{
IADsLargeInteger lgInt =
(IADsLargeInteger) de.Properties["lastLogon"].Value;
lastLogonThisServer = ((long)lgInt.HighPart << 32) + lgInt.LowPart;
return DateTime.FromFileTime(lastLogonThisServer);
}
catch (Exception e)
{
return null;
}
}
}
return null;
}
In addition to the previous answer, which shows correct code to get value from IADsLargeInteger
variable , I just want to say that there's no need to add a reference to a COM Types library if you need only this interface.
To work with COM type you can define interface in your own code:
[ComImport, Guid("9068270b-0939-11d1-8be1-00c04fd8d503"), InterfaceType(ComInterfaceType.InterfaceIsDual)]
internal interface IAdsLargeInteger
{
long HighPart
{
[SuppressUnmanagedCodeSecurity] get; [SuppressUnmanagedCodeSecurity] set;
}
long LowPart
{
[SuppressUnmanagedCodeSecurity] get; [SuppressUnmanagedCodeSecurity] set;
}
}
and use it the same way:
var largeInt = (IAdsLargeInteger)directoryEntry.Properties[propertyName].Value;
var datelong = (largeInt.HighPart << 32) + largeInt.LowPart;
var dateTime = DateTime.FromFileTimeUtc(datelong);
There's also a good article, explaining how to interpret ADSI data
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