public static ArrayList GetNetworkComputers()
{
ArrayList networkComputers = new ArrayList();
const int MAX_PREFERRED_LENGTH = -1;
int SV_TYPE_WORKSTATION = 1;
int SV_TYPE_SERVER = 2;
IntPtr buffer = IntPtr.Zero;
IntPtr tmpBuffer = IntPtr.Zero;
int entriesRead;
int totalEntries;
int resHandle;
int sizeofInfo = Marshal.SizeOf(typeof(ServerInfo100));
try
{
int ret = NetServerEnum(null, 100, ref buffer,
MAX_PREFERRED_LENGTH, out entriesRead, out totalEntries,
SV_TYPE_WORKSTATION | SV_TYPE_SERVER, null, out resHandle);
if (ret == 0)
{
for (int i = 0; i < totalEntries; i++)
{
tmpBuffer = new IntPtr((long)buffer + (i * sizeofInfo));
ServerInfo100 svrInfo = (ServerInfo100)
Marshal.PtrToStructure(tmpBuffer,
typeof(ServerInfo100));
networkComputers.Add(svrInfo.sv100_name);
}
}
}
catch (Exception ex)
{
return(null);
}
finally
{
NetApiBufferFree(buffer);
}
return(networkComputers);
}
/// <summary>
/// Uses the DllImport : NetServerEnum with all its required parameters
/// (see http://msdn.microsoft.com/library/default.asp?url=/library/en-us/netmgmt/netmgmt/netserverenum.asp
/// for full details or method signature) to retrieve a list of domain SV_TYPE_WORKSTATION
/// and SV_TYPE_SERVER PC's
/// </summary>
/// <returns>Arraylist that represents all the SV_TYPE_WORKSTATION and SV_TYPE_SERVER
/// PC's in the Domain</returns>
public ArrayList GetNetworkComputers()
{
//local fields
ArrayList networkComputers = new ArrayList();
const int MaxPreferredLength = -1;
int sVTypeWorkstation = 1;
int sVTypeServer = 2;
IntPtr buffer = IntPtr.Zero;
IntPtr tmpBuffer = IntPtr.Zero;
int entriesRead = 0;
int totalEntries = 0;
int resHandle = 0;
int sizeofInfo = Marshal.SizeOf(typeof(ServerInfo100));
try
{
//call the DllImport : NetServerEnum with all its required parameters
//see http://msdn.microsoft.com/library/default.asp?url=/library/en-us/netmgmt/netmgmt/netserverenum.asp
//for full details of method signature
int ret = NetServerEnum(null, 100, ref buffer, MaxPreferredLength,
out entriesRead,
out totalEntries, sVTypeWorkstation | sVTypeServer, null, out resHandle);
//if the returned with a NERR_Success (C++ term), =0 for C#
if (ret == 0)
{
//loop through all SV_TYPE_WORKSTATION and SV_TYPE_SERVER PC's
for (int i = 0; i < totalEntries; i++)
{
//get pointer to, Pointer to the buffer that received the data from
//the call to NetServerEnum. Must ensure to use correct size of
//STRUCTURE to ensure correct location in memory is pointed to
tmpBuffer = new IntPtr((int)buffer + (i * sizeofInfo));
//Have now got a pointer to the list of SV_TYPE_WORKSTATION and
//SV_TYPE_SERVER PC's, which is unmanaged memory
//Needs to Marshal data from an unmanaged block of memory to a
//managed object, again using STRUCTURE to ensure the correct data
//is marshalled
ServerInfo100 svrInfo = (ServerInfo100)
Marshal.PtrToStructure(tmpBuffer, typeof(ServerInfo100));
//add the PC names to the ArrayList
networkComputers.Add(svrInfo.Sv100Name);
}
}
}
catch (Exception ex)
{
MessageBox.Show("Problem with acessing network computers in NetworkBrowser " +
"\r\n\r\n\r\n" + ex.Message,
"Error", MessageBoxButton.OK,
MessageBoxImage.Error);
return(null);
}
finally
{
//The NetApiBufferFree function frees
//the memory that the NetApiBufferAllocate function allocates
NetApiBufferFree(buffer);
}
//return entries found
return(networkComputers);
}
