Socket Socket Socket Constructors

定义

重载

Socket(SocketInformation) Socket(SocketInformation) Socket(SocketInformation)

使用 Socket 返回的指定的值初始化 DuplicateAndClose(Int32) 类的新实例。Initializes a new instance of the Socket class using the specified value returned from DuplicateAndClose(Int32).

Socket(SocketType, ProtocolType) Socket(SocketType, ProtocolType) Socket(SocketType, ProtocolType)

使用指定的地址族、套接字类型和协议初始化 Socket 类的新实例。Initializes a new instance of the Socket class using the specified socket type and protocol.

Socket(AddressFamily, SocketType, ProtocolType) Socket(AddressFamily, SocketType, ProtocolType) Socket(AddressFamily, SocketType, ProtocolType)

使用指定的地址族、套接字类型和协议初始化 Socket 类的新实例。Initializes a new instance of the Socket class using the specified address family, socket type and protocol.

Socket(SocketInformation) Socket(SocketInformation) Socket(SocketInformation)

使用 Socket 返回的指定的值初始化 DuplicateAndClose(Int32) 类的新实例。Initializes a new instance of the Socket class using the specified value returned from DuplicateAndClose(Int32).

public:
 Socket(System::Net::Sockets::SocketInformation socketInformation);
public Socket (System.Net.Sockets.SocketInformation socketInformation);
new System.Net.Sockets.Socket : System.Net.Sockets.SocketInformation -> System.Net.Sockets.Socket

参数

socketInformation
SocketInformation SocketInformation SocketInformation

DuplicateAndClose(Int32) 返回的套接字信息。The socket information returned by DuplicateAndClose(Int32).

注解

如果您调用Socket多次使用相同的字节数组,作为每个调用的参数的构造函数,您将创建多个托管Socket与同一个基础套接字。If you call the Socket constructor multiple times with the same byte array as the argument for each call, you will create multiple managed Sockets with the same underlying socket. 这种做法是强烈建议不要使用。This practice is strongly discouraged.

Socket(SocketType, ProtocolType) Socket(SocketType, ProtocolType) Socket(SocketType, ProtocolType)

使用指定的地址族、套接字类型和协议初始化 Socket 类的新实例。Initializes a new instance of the Socket class using the specified socket type and protocol.

public:
 Socket(System::Net::Sockets::SocketType socketType, System::Net::Sockets::ProtocolType protocolType);
public Socket (System.Net.Sockets.SocketType socketType, System.Net.Sockets.ProtocolType protocolType);
new System.Net.Sockets.Socket : System.Net.Sockets.SocketType * System.Net.Sockets.ProtocolType -> System.Net.Sockets.Socket

参数

socketType
SocketType SocketType SocketType

SocketType 值之一。One of the SocketType values.

protocolType
ProtocolType ProtocolType ProtocolType

ProtocolType 值之一。One of the ProtocolType values.

异常

socketTypeprotocolType 组合将导致套接字无效。The combination of socketType and protocolType results in an invalid socket.

注解

socketType参数指定的类型Socket类和protocolType参数指定使用的协议SocketThe socketType parameter specifies the type of the Socket class and the protocolType parameter specifies the protocol used by Socket. 两个参数不是独立的。The two parameters are not independent. 通常Socket类型是隐式的协议。Often the Socket type is implicit in the protocol. 如果的组合Socket类型和协议类型结果无效Socket,此构造函数引发SocketExceptionIf the combination of Socket type and protocol type results in an invalid Socket, this constructor throws a SocketException.

备注

如果此构造函数将引发SocketException,使用SocketException.ErrorCode属性来获取特定错误代码。If this constructor throws a SocketException, use the SocketException.ErrorCode property to obtain the specific error code. 获取此代码后,请参阅Windows 套接字版本 2 API 错误代码有关错误的详细说明的文档。After you have obtained this code, refer to the Windows Sockets version 2 API error code documentation for a detailed description of the error.

备注

当你在应用程序中启用网络跟踪后,此成员将输出跟踪信息。This member outputs trace information when you enable network tracing in your application. 有关详细信息,请参阅在.NET Framework 中进行网络跟踪For more information, see Network Tracing in the .NET Framework.

Socket(AddressFamily, SocketType, ProtocolType) Socket(AddressFamily, SocketType, ProtocolType) Socket(AddressFamily, SocketType, ProtocolType)

使用指定的地址族、套接字类型和协议初始化 Socket 类的新实例。Initializes a new instance of the Socket class using the specified address family, socket type and protocol.

public:
 Socket(System::Net::Sockets::AddressFamily addressFamily, System::Net::Sockets::SocketType socketType, System::Net::Sockets::ProtocolType protocolType);
public Socket (System.Net.Sockets.AddressFamily addressFamily, System.Net.Sockets.SocketType socketType, System.Net.Sockets.ProtocolType protocolType);
new System.Net.Sockets.Socket : System.Net.Sockets.AddressFamily * System.Net.Sockets.SocketType * System.Net.Sockets.ProtocolType -> System.Net.Sockets.Socket

参数

addressFamily
AddressFamily AddressFamily AddressFamily

AddressFamily 值之一。One of the AddressFamily values.

socketType
SocketType SocketType SocketType

SocketType 值之一。One of the SocketType values.

protocolType
ProtocolType ProtocolType ProtocolType

ProtocolType 值之一。One of the ProtocolType values.

异常

addressFamilysocketTypeprotocolType 的组合会导致无效套接字。The combination of addressFamily, socketType, and protocolType results in an invalid socket.

示例

下面的代码示例演示如何创建的实例Socket类。The following code example demonstrates how to create an instance of the Socket class.

#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" );
   array<Byte>^ByteGet = ASCII->GetBytes( Get );
   array<Byte>^RecvBytes = gcnew array<Byte>(256);
   String^ strRetPage = nullptr;
   
   // 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 = nullptr;
      IPEndPoint^ hostEndPoint;
      IPAddress^ hostAddress = nullptr;
      int conPort = 80;
      
      // Get DNS host information.
      IPHostEntry^ hostInfo = Dns::Resolve( server );
      
      // Get the DNS IP addresses associated with the host.
      array<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 = gcnew IPEndPoint( hostAddress,conPort );
         
         // Creates the Socket to send data over a TCP connection.
         s = gcnew 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 = nullptr;
            continue;
         }

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

      }
      
      // 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 ) );
      }

      
   }
   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" ) );
}

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.GetHostEntry(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"));
   }
 }
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

注解

addressFamily参数指定的寻址方案Socket类使用,socketType参数指定的类型Socket类,并且protocolType参数指定使用的协议SocketThe addressFamily parameter specifies the addressing scheme that the Socket class uses, the socketType parameter specifies the type of the Socket class, and the protocolType parameter specifies the protocol used by Socket. 三个参数不是独立的。The three parameters are not independent. 有些地址族限制可以使用哪些协议,使用它们,并经常Socket类型是隐式的协议。Some address families restrict which protocols can be used with them, and often the Socket type is implicit in the protocol. 如果地址族的组合Socket类型和协议类型无效Socket,此构造函数引发SocketExceptionIf the combination of address family, Socket type, and protocol type results in an invalid Socket, this constructor throws a SocketException.

备注

如果此构造函数将引发SocketException,使用SocketException.ErrorCode属性来获取特定错误代码。If this constructor throws a SocketException, use the SocketException.ErrorCode property to obtain the specific error code. 获取此代码后,请参阅Windows 套接字版本 2 API 错误代码有关错误的详细说明的文档。After you have obtained this code, refer to the Windows Sockets version 2 API error code documentation for a detailed description of the error.

备注

当你在应用程序中启用网络跟踪后,此成员将输出跟踪信息。This member outputs trace information when you enable network tracing in your application. 有关详细信息,请参阅在.NET Framework 中进行网络跟踪For more information, see Network Tracing in the .NET Framework.

另请参阅

适用于