This class might help. The main method you're after is the
MapFolderToDrive() method, which you pass a drive letter and a folder name
to. It creates a logical drive.
You'll also want to have a look at the DriveInfo class, which will let you
get a list of used drive letters.
If you want the complete solution, I've uploaded it to:
http://www.sabarnett.co.uk/downloads/MapFolder.zip
This is a simple app that allows you to create drive mappings interactively.
It can also be run at startup to re-map drives on reboot. It's probably not
the highest quality as it was one of my first apps, but it illustrates the
methods needed to map a drive.
HTH
Steve
using System;
using System.Collections.Generic;
using System.Text;
using System.ComponentModel;
using System.Runtime.InteropServices;
namespace Lucidus.MapFolder
{
class VolumeFunctions
{
[DllImport("kernel32.dll")]
internal static extern bool DefineDosDevice(uint dwFlags, string
lpDeviceName,
string lpTargetPath);
[DllImport("Kernel32.dll")]
internal static extern uint QueryDosDevice(string lpDeviceName,
StringBuilder lpTargetPath, uint ucchMax);
internal const uint DDD_RAW_TARGET_PATH = 0x00000001;
internal const uint DDD_REMOVE_DEFINITION = 0x00000002;
internal const uint DDD_EXACT_MATCH_ON_REMOVE = 0x00000004;
internal const uint DDD_NO_BROADCAST_SYSTEM = 0x00000008;
const string MAPPED_FOLDER_INDICATOR = @"\??\";
// ----------------------------------------------------------------------------------------
// Class Name: VolumeFunctions
// Procedure Name: MapFolderToDrive
// Purpose: Map the folder to a drive letter
// Parameters:
// - driveLetter (string) : Drive letter in the format "C:"
without a back slash
// - folderName (string) : Folder to map without a back slash
// ----------------------------------------------------------------------------------------
internal static string MapFolderToDrive(string driveLetter, string
folderName)
{
// Is this drive already mapped? If so, we don't remap it!
StringBuilder volumeMap = new StringBuilder(1024);
QueryDosDevice(driveLetter, volumeMap, (uint)1024);
if (volumeMap.ToString().StartsWith(MAPPED_FOLDER_INDICATOR) ==
true)
return "Volume is already mapped - map not changed";
// Map the folder to the drive
DefineDosDevice(0, driveLetter, folderName);
// Display a status message to the user.
string statusMessage = new
Win32Exception(Marshal.GetLastWin32Error()).ToString();
return statusMessage.Substring(statusMessage.IndexOf(":") + 1);
}
// ----------------------------------------------------------------------------------------
// Class Name: VolumeFunctions
// Procedure Name: UnmapFolderFromDrive
// Purpose: Unmap a drive letter. We always unmp the drive,
without checking the
// folder name.
// Parameters:
// - driveLetter (string) : Drive letter to be released, the the
format "C:"
// - folderName (string) : Folder name that the drive is mapped
to.
// ----------------------------------------------------------------------------------------
internal static string UnmapFolderFromDrive(string driveLetter,
string folderName)
{
DefineDosDevice(DDD_REMOVE_DEFINITION, driveLetter, folderName);
// Display the status of the "last" unmap we run.
string statusMessage = new
Win32Exception(Marshal.GetLastWin32Error()).ToString();
return statusMessage.Substring(statusMessage.IndexOf(":") + 1);
}
// ----------------------------------------------------------------------------------------
// Class Name: VolumeFunctions
// Procedure Name: DriveIsMappedTo
// Purpose: Returns the folder that a drive is mapped to. If not
mapped, we return a blank.
// Parameters:
// - driveLetter (string) : Drive letter in the format "C:"
// ----------------------------------------------------------------------------------------
internal static string DriveIsMappedTo(string driveLetter)
{
StringBuilder volumeMap = new StringBuilder(512);
string mappedVolumeName = "";
// If it's not a mapped drive, just remove it from the list
uint mapped = QueryDosDevice(driveLetter, volumeMap, (uint)512);
if (mapped != 0)
if (volumeMap.ToString().StartsWith(MAPPED_FOLDER_INDICATOR)
== true)
{
// It's a mapped drive, so return the mapped folder name
mappedVolumeName = volumeMap.ToString().Substring(4);
}
return mappedVolumeName;
}
}
}
