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ProtocolType Enumeration

Specifies the protocols that the Socket class supports.

[Visual Basic]
<Serializable>
Public Enum ProtocolType
[C#]
[Serializable]
public enum ProtocolType
[C++]
[Serializable]
__value public enum ProtocolType
[JScript]
public
   Serializable
enum ProtocolType

Remarks

The Socket class uses the ProtocolType enumeration to inform the Windows Socket API of the requested protocol. Low-level driver software for the requested protocol must be present on the computer for the Socket to be created successfully.

Members

Member name Description
Ggp

Supported by the .NET Compact Framework.

Gateway To Gateway Protocol.
Icmp

Supported by the .NET Compact Framework.

Internet Control Message Protocol.
Idp

Supported by the .NET Compact Framework.

IDP Protocol.
Igmp

Supported by the .NET Compact Framework.

Internet Group Management Protocol.
IP

Supported by the .NET Compact Framework.

Internet Protocol.
IPv6
Ipx

Supported by the .NET Compact Framework.

IPX Protocol.
ND

Supported by the .NET Compact Framework.

Net Disk Protocol (unofficial).
Pup

Supported by the .NET Compact Framework.

PUP Protocol.
Raw

Supported by the .NET Compact Framework.

Raw UP packet protocol.
Spx

Supported by the .NET Compact Framework.

SPX Protocol.
SpxII

Supported by the .NET Compact Framework.

SPX Version 2 Protocol.
Tcp

Supported by the .NET Compact Framework.

Transmission Control Protocol.
Udp

Supported by the .NET Compact Framework.

User Datagram Protocol.
Unknown

Supported by the .NET Compact Framework.

Unknown protocol.
Unspecified

Supported by the .NET Compact Framework.

Unspecified protocol.

Example

[Visual Basic, C#, C++] The following example demonstrates how to use ProtocolType to instantiate a Socket.

[Visual Basic] 
Imports System
Imports System.Text
Imports System.IO
Imports System.Net
Imports System.Net.Sockets

 _

Public Class Sample
   
   
   Public Shared Function DoSocketGet(server As String) As String
      'Set up variables and String to write to the server.
    Dim ASCII As Encoding = Encoding.ASCII
    Dim [Get] As String = "GET / HTTP/1.1" + ControlChars.Lf + ControlChars.NewLine + "Host: " + server + ControlChars.Lf + ControlChars.NewLine + "Connection: Close" + ControlChars.Lf + ControlChars.NewLine + ControlChars.Lf + ControlChars.NewLine
    Dim ByteGet As [Byte]() = ASCII.GetBytes([Get])
    Dim RecvBytes(256) As [Byte]
    Dim strRetPage As [String] = Nothing


      
      ' IPAddress and IPEndPoint represent the endpoint that will
      '   receive the request.
      ' Get first IPAddress in list return by DNS.
      Try

 

         ' Define those variables to be evaluated in the next for loop and 
         ' then used to connect to the server. These variables are defined
         ' outside the for loop to make them accessible there after.
         Dim s As Socket = Nothing
         Dim hostEndPoint As IPEndPoint
         Dim hostAddress As IPAddress = Nothing
         Dim conPort As Integer = 80
         
         ' Get DNS host information.
         Dim hostInfo As IPHostEntry = Dns.Resolve(server)
         ' Get the DNS IP addresses associated with the host.
         Dim IPaddresses As IPAddress() = hostInfo.AddressList
         
         ' Evaluate the socket and receiving host IPAddress and IPEndPoint. 
      Dim index As Integer = 0
      For index = 0 To IPaddresses.Length - 1
        hostAddress = IPaddresses(index)
        hostEndPoint = New IPEndPoint(hostAddress, conPort)


        ' Creates the Socket to send data over a TCP connection.
        s = New Socket(AddressFamily.InterNetwork, SocketType.Stream, ProtocolType.Tcp)


        ' Connect to the host using its IPEndPoint.
        s.Connect(hostEndPoint)

        If Not s.Connected Then
          ' Connection failed, try next IPaddress.
          strRetPage = "Unable to connect to host"
          s = Nothing
          GoTo ContinueFor1
        End If


        ' Sent the GET request to the host.
        s.Send(ByteGet, ByteGet.Length, 0)


ContinueFor1:
      Next index  ' End of the for loop.
      



      ' Receive the host home page content and loop until all the data is received.

      'Dim bytes As Int32 = s.Receive(RecvBytes, RecvBytes.Length, 0)
      Dim bytes As Int32 = s.Receive(RecvBytes, RecvBytes.Length, 0)

      strRetPage = "Default HTML page on " + server + ":\r\n"
      strRetPage = "Default HTML page on " + server + ":" + ControlChars.Lf + ControlChars.NewLine

      Dim i As Integer

      While bytes > 0

        bytes = s.Receive(RecvBytes, RecvBytes.Length, 0)

        strRetPage = strRetPage + ASCII.GetString(RecvBytes, 0, bytes)

      End While


      ' End of the try block.
    Catch e As SocketException
         Console.WriteLine("SocketException caught!!!")
         Console.WriteLine(("Source : " + e.Source))
         Console.WriteLine(("Message : " + e.Message))
      Catch e As ArgumentNullException
         Console.WriteLine("ArgumentNullException caught!!!")
         Console.WriteLine(("Source : " + e.Source))
         Console.WriteLine(("Message : " + e.Message))
      Catch e As NullReferenceException
         Console.WriteLine("NullReferenceException caught!!!")
         Console.WriteLine(("Source : " + e.Source))
         Console.WriteLine(("Message : " + e.Message))
      Catch e As Exception
         Console.WriteLine("Exception caught!!!")
         Console.WriteLine(("Source : " + e.Source))
         Console.WriteLine(("Message : " + e.Message))
      End Try
      
      Return strRetPage
   End Function 'DoSocketGet
    
   Public Shared Sub Main()
    Console.WriteLine(DoSocketGet("localhost"))
   End Sub 'Main
End Class 'Sample

[C#] 
using System;
using System.Text;
using System.IO;
using System.Net;
using System.Net.Sockets;

public class Sample
{

  public static string DoSocketGet(string server) 
  {
    //Set up variables and String to write to the server.
    Encoding ASCII = Encoding.ASCII;
    string Get = "GET / HTTP/1.1\r\nHost: " + server + 
                 "\r\nConnection: Close\r\n\r\n";
    Byte[] ByteGet = ASCII.GetBytes(Get);
    Byte[] RecvBytes = new Byte[256];
    String strRetPage = null;


    // IPAddress and IPEndPoint represent the endpoint that will
    //   receive the request.
    // Get first IPAddress in list return by DNS.


    try
    {


      // Define those variables to be evaluated in the next for loop and 
      // then used to connect to the server. These variables are defined
      // outside the for loop to make them accessible there after.
      Socket s = null;
      IPEndPoint hostEndPoint;
      IPAddress hostAddress = null;
      int conPort = 80;

      // Get DNS host information.
      IPHostEntry hostInfo = Dns.Resolve(server);
      // Get the DNS IP addresses associated with the host.
      IPAddress[] IPaddresses = hostInfo.AddressList;

      // Evaluate the socket and receiving host IPAddress and IPEndPoint. 
      for (int index=0; index<IPaddresses.Length; index++)
      {
        hostAddress = IPaddresses[index];
        hostEndPoint = new IPEndPoint(hostAddress, conPort);


        // Creates the Socket to send data over a TCP connection.
        s = new Socket(AddressFamily.InterNetwork, SocketType.Stream, ProtocolType.Tcp );


 
        // Connect to the host using its IPEndPoint.
        s.Connect(hostEndPoint);

        if (!s.Connected)
        {
          // Connection failed, try next IPaddress.
          strRetPage = "Unable to connect to host";
          s = null;
          continue;
        }

        // Sent the GET request to the host.
        s.Send(ByteGet, ByteGet.Length, 0);


      } // End of the for loop.      


 
      // Receive the host home page content and loop until all the data is received.
      Int32 bytes = s.Receive(RecvBytes, RecvBytes.Length, 0);
      strRetPage = "Default HTML page on " + server + ":\r\n";
      strRetPage = strRetPage + ASCII.GetString(RecvBytes, 0, bytes);
 
      while (bytes > 0)
      {
        bytes = s.Receive(RecvBytes, RecvBytes.Length, 0);
        strRetPage = strRetPage + ASCII.GetString(RecvBytes, 0, bytes);
      }

    
    } // End of the try block.
    
    catch(SocketException e) 
    {
      Console.WriteLine("SocketException caught!!!");
      Console.WriteLine("Source : " + e.Source);
      Console.WriteLine("Message : " + e.Message);
    }
    catch(ArgumentNullException e)
    {
      Console.WriteLine("ArgumentNullException caught!!!");
      Console.WriteLine("Source : " + e.Source);
      Console.WriteLine("Message : " + e.Message);
    }
    catch(NullReferenceException e)
    {
      Console.WriteLine("NullReferenceException caught!!!");
      Console.WriteLine("Source : " + e.Source);
      Console.WriteLine("Message : " + e.Message);
    }
    catch(Exception e)
    {
      Console.WriteLine("Exception caught!!!");
      Console.WriteLine("Source : " + e.Source);
      Console.WriteLine("Message : " + e.Message);
    }
    
    return strRetPage;

}
   public static void Main()
   {
      Console.WriteLine(DoSocketGet("localhost"));
   }
 }

[C++] 
#using <mscorlib.dll>
#using <System.dll>

using namespace System;
using namespace System::Text;
using namespace System::IO;
using namespace System::Net;
using namespace System::Net::Sockets;

String *DoSocketGet(String *server) 
{
   //Set up variables and String to write to the server.
   Encoding *ASCII = Encoding::ASCII;
   String *Get = "GET / HTTP/1.1\r\nHost: ";
   Get->Concat(server, "\r\nConnection: Close\r\n\r\n");
   Byte ByteGet[] = ASCII->GetBytes(Get);
   Byte RecvBytes[] = new Byte[256];
   String *strRetPage = 0;

   // IPAddress and IPEndPoint represent the endpoint that will
   //   receive the request.
   // Get first IPAddress in list return by DNS.

   try
   {
      // Define those variables to be evaluated in the next for loop and 
      // then used to connect to the server. These variables are defined
      // outside the for loop to make them accessible there after.
      Socket *s = 0;
      IPEndPoint *hostEndPoint;
      IPAddress *hostAddress = 0;
      int conPort = 80;

      // Get DNS host information.
      IPHostEntry *hostInfo = Dns::Resolve(server);
      // Get the DNS IP addresses associated with the host.
      IPAddress *IPaddresses[] = hostInfo->AddressList;

      // Evaluate the socket and receiving host IPAddress and IPEndPoint. 
      for (int index=0; index<IPaddresses->Length; index++)
      {
         hostAddress = IPaddresses[index];
         hostEndPoint = new IPEndPoint(hostAddress, conPort);


         // Creates the Socket to send data over a TCP connection.
         s = new Socket(AddressFamily::InterNetwork, SocketType::Stream, ProtocolType::Tcp );



         // Connect to the host using its IPEndPoint.
         s->Connect(hostEndPoint);

         if (!s->Connected)
         {
            // Connection failed, try next IPaddress.
            strRetPage = "Unable to connect to host";
            s = 0;
            continue;
         }

         // Sent the GET request to the host.
         s->Send(ByteGet, ByteGet->Length, SocketFlags::None);


      } // End of the for loop.      



      // Receive the host home page content and loop until all the data is received.
      Int32 bytes = s->Receive(RecvBytes, RecvBytes->Length, SocketFlags::None);
      strRetPage = "Default HTML page on ";
      strRetPage->Concat(server, ":\r\n", ASCII->GetString(RecvBytes, 0, bytes));

      while (bytes > 0)
      {
         bytes = s->Receive(RecvBytes, RecvBytes->Length, SocketFlags::None);
         strRetPage->Concat(ASCII->GetString(RecvBytes, 0, bytes));
      }


   } // End of the try block.

   catch(SocketException *e) 
   {
      Console::WriteLine("SocketException caught!!!");
      Console::Write("Source : ");
      Console::WriteLine(e->Source);
      Console::Write("Message : ");
      Console::WriteLine(e->Message);
   }
   catch(ArgumentNullException *e)
   {
      Console::WriteLine("ArgumentNULLException caught!!!");
      Console::Write("Source : ");
      Console::WriteLine(e->Source);
      Console::Write("Message : ");
      Console::WriteLine(e->Message);
   }
   catch(NullReferenceException *e)
   {
      Console::WriteLine("NULLReferenceException caught!!!");
      Console::Write("Source : ");
      Console::WriteLine(e->Source);
      Console::Write("Message : ");
      Console::WriteLine(e->Message);
   }
   catch(Exception *e)
   {
      Console::WriteLine("Exception caught!!!");
      Console::Write("Source : ");
      Console::WriteLine(e->Source);
      Console::Write("Message : ");
      Console::WriteLine(e->Message);
   }

   return strRetPage;
}

int main()
{
   Console::WriteLine(DoSocketGet("localhost"));
}

[JScript] No example is available for JScript. To view a Visual Basic, C#, or C++ example, click the Language Filter button Language Filter in the upper-left corner of the page.

Requirements

Namespace: System.Net.Sockets

Platforms: Windows 98, Windows NT 4.0, Windows Millennium Edition, Windows 2000, Windows XP Home Edition, Windows XP Professional, Windows Server 2003 family, .NET Compact Framework

Assembly: System (in System.dll)

See Also

System.Net.Sockets Namespace | AddressFamily

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