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#1 PurpleFairy   User is offline

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using kernel32 function

Posted 29 May 2009 - 12:20 AM


I am stuck on trying to call a kernel32 function into my c# program. Basically I am trying to copy files that have really long names. I get the normal windows PathTooLong exception thrown at me wth System.IO.File.Copy() and has been trying to find a work around using kernel32.

both the CopyFile and the GetShortPathName do not return anything.

is there a security setting to set?
they don't give errors either.

thanks for your help.


using System;
using System.Collections.Generic;
using System.Text;
using System.Runtime.InteropServices;
//using Microsoft.Win32;

namespace Test_string
	public class Program

	   [DllImport("kernel32.dll", CharSet = CharSet.Unicode, CallingConvention = CallingConvention.StdCall, SetLastError=true)]
		[return: MarshalAs(UnmanagedType.Bool)]
		static extern bool CopyFileW(
				   [MarshalAs(UnmanagedType.LPStr)] string lpExistingFileName,
				   [MarshalAs(UnmanagedType.LPStr)] string lpNewFileName,
				   [MarshalAs(UnmanagedType.Bool)] bool bFailIfExists);

		[DllImport("kernel32.dll", CharSet = CharSet.Auto)]

		public static extern int GetShortPathName(


				   string path,


				   StringBuilder shortPath,

				 int shortPathLength


		static void Main(string[] args)

			//Test copy from Uploaded Docs in ARIES to local directory
			string fileName = @"ReallyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyLoooonnnngggggggggggggggggggggBbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbblllllllllllllllllllllllllllllllllllll.pdf";
			//string fileName = @"testfile.pdf";
			string sourcePath = @"C:\Users\PurpleFairy\Documents\RO\Test_string\";
			string targetPath = @"C:\Users\PurpleFairy\Documents\RO\Test_string\output\";

			//Use Path class to manipulate file and directory paths

			string sourceFile = System.IO.Path.Combine(sourcePath, fileName);
			string f_sourceFile = @"\\?\" + sourceFile;
			//string destFile = System.IO.Path.Combine(targetPath, fileName);
			StringBuilder shortPath = new StringBuilder(200);
			GetShortPathName(sourceFile, shortPath, shortPath.Capacity);
			Console.WriteLine("short name: " + shortPath.ToString());

			// To copy a folder's contents to a new location:
			// Create a new target folder, if necessary.
			if (!System.IO.Directory.Exists(targetPath))

			// To copy a file to another location and 
			// overwrite the destination file if it already exists.
			string destFile = System.IO.Path.Combine(targetPath, fileName);
			string f_destFile = @"\\?\" + destFile;
			//System.IO.File.Copy(sourceFile, destFile, true);
			Console.WriteLine(Program.CopyFileW(sourceFile, destFile, true));
			Console.WriteLine("after copy");


This post has been edited by PurpleFairy: 29 May 2009 - 12:21 AM

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Replies To: using kernel32 function

#2 lesPaul456   User is offline

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Re: using kernel32 function

Posted 29 May 2009 - 08:23 AM

Here's a great site that shows you the how to use PInvoke for tons of functions: http://www.pinvoke.net/
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#3 debjit625   User is offline

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Re: using kernel32 function

Posted 29 May 2009 - 09:52 AM

string fileName = @& #34;ReallyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyLoooonnnnggggggggggggggg

Check this one your fileName is not in a valid format.Give a valid format.

I am not very much sure but you can try this.

Your strings (file and path) are not converting properly.As the function you are using
it takes a LPSTR .i.e.. Long pointer string,so pass it like this

let the file name with path is "C:\Code\My.cs"


string sourcefile = "C:\\Code\\My.cs";

Good luck

This post has been edited by debjit625: 29 May 2009 - 09:54 AM

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#4 masteryee   User is offline

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Re: using kernel32 function

Posted 29 May 2009 - 10:39 AM

The Windows OS puts a limitation on the path/file lengths. In any case, google is everyone's friend, and the following links may be able to help you out:


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