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PathCompactPathEx (shlwapi)
 
.
Summary
Truncates a path to fit within a certain number of characters by replacing path components with ellipses.

C# Signature:

[DllImport("shlwapi.dll", CharSet=CharSet.Auto)]
static extern bool PathCompactPathEx([Out] StringBuilder pszOut, string szPath, int cchMax, int dwFlags);

VB Signature:

<DllImport("shlwapi.dll", CharSet:=CharSet.Auto)> _
Shared Function PathCompactPathEx(ByVal pszOut As StringBuilder, _
                   ByVal szPath As String, _
                   ByVal cchMax As Integer, _
                   ByVal dwFlags As Integer) As Boolean
End Function

User-Defined Types:

None.

Notes:

If you have an HDC, take a look at PathCompactPath

Tips & Tricks:

Please add some!

Sample Code:

using System;

using System.Runtime.InteropServices;

using System.Text;

namespace CompactPathCmd

{

    /// <summary>
    /// Summary description for Class1.
    /// </summary>
    class Program
    {
        /// <summary>
        /// The main entry point for the application.
        /// </summary>
        [STAThread]
        static void Main(string[] args)
        {
            string longPath = "c:\\a\\very\\very\\long\\path\\that\\needs\\to\\be\\shortened\\by\\calling\\the\\PathCompactpathEx";
            int length = 40;

            string result = CompactPath(longPath, length);
            Console.WriteLine("     1     2     3     4     5     6     7");
            Console.WriteLine("1234567890123456789012345678901234567890123456789012345678901234567890123456789");
            Console.WriteLine(result);
        }

        [DllImport("shlwapi.dll", CharSet=CharSet.Auto)]
        static extern bool PathCompactPathEx([Out] StringBuilder pszOut, string szPath, int cchMax, int dwFlags);

        public static string CompactPath(string longPathName, int wantedLength)
        {
            StringBuilder sb = new StringBuilder();
            PathCompactPathEx(sb, longPathName, wantedLength + 1, 0);
            return sb.ToString();
        }

    }

}

Alternative Managed API:

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Documentation

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