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WNetEnumResource

C# Signature:

[DllImport("MPR.dll")]
  public static extern UInt32 WNetEnumResource(IntPtr hEnum, ref Int32 lpcCount,
    IntPtr lpBuffer, ref UInt32 lpBufferSize);

User-Defined Types:

None.

Notes:

None.

Tips & Tricks:

Please add some!

Sample Code:

//Coded by Eugene E. Zhukovsky, 8.21.2002

// Added by Kill

//declare the DLL import functions

[DllImport("mpr.dll", CharSet=CharSet.Auto)]
  public static extern int WNetEnumResource(
    IntPtr hEnum,
    ref int lpcCount,
    IntPtr lpBuffer,
    ref int lpBufferSize );

[DllImport("mpr.dll", CharSet=CharSet.Auto)]
  public static extern int WNetOpenEnum(
    RESOURCE_SCOPE dwScope,
    RESOURCE_TYPE dwType,
    RESOURCE_USAGE dwUsage,
    [MarshalAs(UnmanagedType.AsAny)][In] Object lpNetResource,
    out IntPtr lphEnum);

[DllImport("mpr.dll", CharSet=CharSet.Auto)]
  public static extern int WNetCloseEnum( IntPtr hEnum );
//declare the structures to hold info

public enum RESOURCE_SCOPE
{
    RESOURCE_CONNECTED = 0x00000001,
    RESOURCE_GLOBALNET = 0x00000002,
    RESOURCE_REMEMBERED = 0x00000003,
    RESOURCE_RECENT= 0x00000004,
    RESOURCE_CONTEXT= 0x00000005
}

public enum RESOURCE_TYPE
{
    RESOURCETYPE_ANY= 0x00000000,
    RESOURCETYPE_DISK= 0x00000001,
    RESOURCETYPE_PRINT = 0x00000002,
    RESOURCETYPE_RESERVED = 0x00000008,
}

public enum RESOURCE_USAGE
{
    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 RESOURCE_DISPLAYTYPE
{
    RESOURCEDISPLAYTYPE_GENERIC= 0x00000000,
    RESOURCEDISPLAYTYPE_DOMAIN= 0x00000001,
    RESOURCEDISPLAYTYPE_SERVER= 0x00000002,
    RESOURCEDISPLAYTYPE_SHARE= 0x00000003,
    RESOURCEDISPLAYTYPE_FILE = 0x00000004,
    RESOURCEDISPLAYTYPE_GROUP= 0x00000005,
    RESOURCEDISPLAYTYPE_NETWORK= 0x00000006,
    RESOURCEDISPLAYTYPE_ROOT = 0x00000007,
    RESOURCEDISPLAYTYPE_SHAREADMIN = 0x00000008,
    RESOURCEDISPLAYTYPE_DIRECTORY = 0x00000009,
    RESOURCEDISPLAYTYPE_TREE = 0x0000000A,
    RESOURCEDISPLAYTYPE_NDSCONTAINER = 0x0000000B
}

public struct NETRESOURCE
{
    public RESOURCE_SCOPE dwScope;
    public RESOURCE_TYPE dwType;
    public RESOURCE_DISPLAYTYPE dwDisplayType;
    public RESOURCE_USAGE dwUsage;
    [MarshalAs(System.Runtime.InteropServices.UnmanagedType.LPTStr)] public string lpLocalName;
    [MarshalAs(System.Runtime.InteropServices.UnmanagedType.LPTStr)] public string lpRemoteName;
    [MarshalAs(System.Runtime.InteropServices.UnmanagedType.LPTStr)] public string lpComment;
    [MarshalAs(System.Runtime.InteropServices.UnmanagedType.LPTStr)] public string lpProvider;
}

//the function we'll be calling

public static void WNETOE(Object o)
{
    int iRet;
    IntPtr ptrHandle = new IntPtr();
    try
    {
       iRet =WNetOpenEnum(
       RESOURCE_SCOPE.RESOURCE_GLOBALNET,
       RESOURCE_TYPE.RESOURCETYPE_ANY,
       RESOURCE_USAGE.RESOURCEUSAGE_ALL,
       o,
       out ptrHandle );
       if( iRet != 0 )
       {
     return;
       }

       int entries;
       int buffer = 16384;
       IntPtr ptrBuffer = Marshal.AllocHGlobal( buffer );
       NETRESOURCE nr;
       for(;;)
       {
      entries = -1;
      buffer = 16384;
     iRet =WNetEnumResource( ptrHandle, ref entries, ptrBuffer, ref buffer );
     if( (iRet != 0) || (entries < 1) )
     {
        break;
     }
     Int32 ptr = ptrBuffer.ToInt32();
     for( int i = 0; i < entries; i++ )
     {
        nr = (NETRESOURCE)Marshal.PtrToStructure( new IntPtr(ptr), typeof(NETRESOURCE) );
        if(RESOURCE_USAGE.RESOURCEUSAGE_CONTAINER == (nr.dwUsage
            & RESOURCE_USAGE.RESOURCEUSAGE_CONTAINER))
        {
         //call recursively to get all entries in a container
         WNETOE(nr);
        }
        ptr += Marshal.SizeOf( nr );
        Console.WriteLine( " {0} : LocalName='{1}' RemoteName='{2}'",
        nr.dwDisplayType.ToString(), nr.lpLocalName, nr.lpRemoteName );
     }
       }
       Marshal.FreeHGlobal( ptrBuffer );
       iRet =WNetCloseEnum( ptrHandle );
    }
    catch(Exception e)
    {
    }
}

//now call the function passing a null
WNETOE(null);

//here's some possible error codes
public enum NERR
{
    NERR_Success = 0,/* Success */
    ERROR_MORE_DATA = 234, // dderror
    ERROR_NO_BROWSER_SERVERS_FOUND = 6118,
    ERROR_INVALID_LEVEL = 124,
    ERROR_ACCESS_DENIED = 5,
    ERROR_INVALID_PARAMETER = 87,
    ERROR_NOT_ENOUGH_MEMORY = 8,
    ERROR_NETWORK_BUSY = 54,
    ERROR_BAD_NETPATH = 53,
    ERROR_NO_NETWORK = 1222,
    ERROR_INVALID_HANDLE_STATE = 1609,
    ERROR_EXTENDED_ERROR= 1208
}

Alternative Managed API:

TODO

Documentation

WNetEnumResource on MSDN