Listview filename sort sequence

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  • James Hahn
    #1

    Listview filename sort sequence

    I have a ListView that displays files selected from various folders using a
    user-specified selection rule. I want to sort the files in various ways and
    have implemented a sorter class to do it, for instance to sort the file date
    as a date and not as text.

    But the filenames are not listed in the same sequence as in Explorer, which
    is some sort of 'Numeric-modified alpha' sequence. Is there a comparer that
    will return the correct sort sequence for a filename, or is there a
    definition of the rules used in an Explorer sort so I could write my own
    comparer?

    Tags: None
    • James Hahn
      #2
      Re: Listview filename sort sequence

      Solved it. There is nothing within .Net to do this and I can't find that MS
      has issued a formal definition of their rules, but the old StrCmpLogicalW
      function will do the comparison and appears to produce the same sequence as
      Explorer.

      <System.Runtime .InteropService s.DllImport("sh lwapi.dll",
      charset:=Runtim e.InteropServic es.CharSet.Unic ode)_
      Public Shared Function StrCmpLogicalW( ByVal strA As String, ByVal strB As
      String) As Int32
      End Function

      and then, within the comparer:

      compareResult = StrCmpLogicalW( X, Y.)

      The charset attribute is needed: even though it's a W funtion it does not
      default to Unicode.

      "James Hahn" <jhahn@yahoo.co mwrote in message
      news:ed2XbYtDJH A.4768@TK2MSFTN GP06.phx.gbl...
      >I have a ListView that displays files selected from various folders using a
      >user-specified selection rule. I want to sort the files in various ways
      >and have implemented a sorter class to do it, for instance to sort the file
      >date as a date and not as text.
      >
      But the filenames are not listed in the same sequence as in Explorer,
      which is some sort of 'Numeric-modified alpha' sequence. Is there a
      comparer that will return the correct sort sequence for a filename, or is
      there a definition of the rules used in an Explorer sort so I could write
      my own comparer?

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