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// Classe class.serverenum.cs
using System;
using System.Collections;
using System.Runtime.InteropServices;
namespace ServerEnumerator
{
/// <summary>
/// The ServerEnum class is used to enumerate servers on the
/// network.
/// </summary>
///
public enum ResourceScope
{
RESOURCE_CONNECTED = 1,
RESOURCE_GLOBALNET,
RESOURCE_REMEMBERED,
RESOURCE_RECENT,
RESOURCE_CONTEXT
};
public enum ResourceType
{
RESOURCETYPE_ANY,
RESOURCETYPE_DISK,
RESOURCETYPE_PRINT,
RESOURCETYPE_RESERVED
};
public enum ResourceUsage
{
RESOURCEUSAGE_CONNECTABLE = 0x00000001,
RESOURCEUSAGE_CONTAINER = 0x00000002,
RESOURCEUSAGE_NOLOCALDEVICE = 0x00000004,
RESOURCEUSAGE_SIBLING = 0x00000008,
RESOURCEUSAGE_ATTACHED = 0x00000010,
RESOURCEUSAGE_ALL = (RESOURCEUSAGE_CONNECTABLE | RESOURCEUSAGE_CONTAINER | RESOURCEUSAGE_ATTACHED),
};
public enum ResourceDisplayType
{
RESOURCEDISPLAYTYPE_GENERIC,
RESOURCEDISPLAYTYPE_DOMAIN,
RESOURCEDISPLAYTYPE_SERVER,
RESOURCEDISPLAYTYPE_SHARE,
RESOURCEDISPLAYTYPE_FILE,
RESOURCEDISPLAYTYPE_GROUP,
RESOURCEDISPLAYTYPE_NETWORK,
RESOURCEDISPLAYTYPE_ROOT,
RESOURCEDISPLAYTYPE_SHAREADMIN,
RESOURCEDISPLAYTYPE_DIRECTORY,
RESOURCEDISPLAYTYPE_TREE,
RESOURCEDISPLAYTYPE_NDSCONTAINER
};
public class ServerEnum : IEnumerable
{
enum ErrorCodes
{
NO_ERROR = 0,
ERROR_NO_MORE_ITEMS = 259
};
[StructLayout(LayoutKind.Sequential)]
private class NETRESOURCE
{
public ResourceScope dwScope = 0;
public ResourceType dwType = 0;
public ResourceDisplayType dwDisplayType = 0;
public ResourceUsage dwUsage = 0;
public string lpLocalName = null;
public string lpRemoteName = null;
public string lpComment = null;
public string lpProvider = null;
};
private ArrayList aData = new ArrayList();
public int Count
{
get { return aData.Count; }
}
[DllImport("Mpr.dll", EntryPoint="WNetOpenEnumA", CallingConvention=CallingConvention.Winapi)]
private static extern ErrorCodes WNetOpenEnum(ResourceScope dwScope, ResourceType dwType, ResourceUsage dwUsage, NETRESOURCE p, out IntPtr lphEnum);
[DllImport("Mpr.dll", EntryPoint="WNetCloseEnum", CallingConvention=CallingConvention.Winapi)]
private static extern ErrorCodes WNetCloseEnum(IntPtr hEnum);
[DllImport("Mpr.dll", EntryPoint="WNetEnumResourceA", CallingConvention=CallingConvention.Winapi)]
private static extern ErrorCodes WNetEnumResource(IntPtr hEnum, ref uint lpcCount, IntPtr buffer, ref uint lpBufferSize);
private void EnumerateServers(NETRESOURCE pRsrc, ResourceScope scope, ResourceType type, ResourceUsage usage, ResourceDisplayType displayType)
{
uint bufferSize = 16384;
IntPtr buffer = Marshal.AllocHGlobal((int) bufferSize);
IntPtr handle = IntPtr.Zero;
ErrorCodes result;
uint cEntries = 1;
result = WNetOpenEnum(scope, type, usage, pRsrc, out handle);
if (result == ErrorCodes.NO_ERROR)
{
do
{
result = WNetEnumResource(handle, ref cEntries, buffer, ref bufferSize);
if (result == ErrorCodes.NO_ERROR)
{
Marshal.PtrToStructure(buffer, pRsrc);
if (pRsrc.dwDisplayType == displayType)
aData.Add(pRsrc.lpRemoteName);
if ((pRsrc.dwUsage & ResourceUsage.RESOURCEUSAGE_CONTAINER) == ResourceUsage.RESOURCEUSAGE_CONTAINER)
EnumerateServers(pRsrc, scope, type, usage, displayType);
}
else if (result != ErrorCodes.ERROR_NO_MORE_ITEMS)
break;
} while (result != ErrorCodes.ERROR_NO_MORE_ITEMS);
WNetCloseEnum(handle);
}
Marshal.FreeHGlobal((IntPtr) buffer);
}
public ServerEnum(ResourceScope scope, ResourceType type, ResourceUsage usage, ResourceDisplayType displayType)
{
NETRESOURCE pRsrc = new NETRESOURCE();
EnumerateServers(pRsrc, scope, type, usage, displayType);
}
#region IEnumerable Members
public IEnumerator GetEnumerator()
{
return aData.GetEnumerator();
}
#endregion
}
} |
