Retrieving the LastWrite time from a Registry key

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C#

Hi,

I am trying to retrieve the LastWrite time from the Registry key that stores USB mounted device information and I'm having problems with the conversion to DateTime.

I am using the RegQueryInfoKey[^] API and my code to retireve a DateTime object is:

 // override RegQueryInfoKey. lpftLastWriteTime represented by int array
queryInfoKey = RegQueryInfoKey(hSubKey, null, null, IntPtr.Zero,
                ref lpcSubKeys, null, null, ref lpcValues, null, null, null, lpftLastWriteTime);
// subtract the high datetime form the low datetime. low datetime is negative
long lastWriteTime = (((long)lpftLastWriteTime[1]) << 32) + (long)lpftLastWriteTime[0];
                
// convert long to DateTime object
DateTime lastWrite = DateTime.FromFileTime(lastWriteTime);

However, this code does not return the correct LastWrite time in every case.

Can someone shed a bit of light on this?

Thanks


Shockmeister.