用C++建立客户端Socket，怎么用C#建立服务器端Socket进行通信，C++发数据，C#收数据。请给出示例代码。

TcpListener进行监听就可以了。

using System;

using SystemIO;

using SystemNet;

using SystemNetSockets;

using SystemText;

class MyTcpListener

{

public static void Main()

{

TcpListener server=null;

try

{

// Set the TcpListener on port 13000

Int32 port = 8000;

IPAddress localAddr = IPAddressParse("127001");

// TcpListener server = new TcpListener(port);

server = new TcpListener(localAddr, port);

// Start listening for client requests

serverStart();

// Buffer for reading data

Byte[] bytes = new Byte[4096];

String data = null;

// Enter the listening loop

while(true)

{

ConsoleWrite("Waiting for a connection ");

// Perform a blocking call to accept requests

// You could also user serverAcceptSocket() here

TcpClient client = serverAcceptTcpClient();

ConsoleWriteLine("Connected!");

data = null;

// Get a stream object for reading and writing

NetworkStream stream = clientGetStream();

int i;

// Loop to receive all the data sent by the client

while((i = streamRead(bytes, 0, bytesLength))!=0)

{

// Translate data bytes to a ASCII string

data = SystemTextEncodingASCIIGetString(bytes, 0, i);

ConsoleWriteLine("Received: {0}", data);

// Process the data sent by the client

data = dataToUpper();

byte[] msg = SystemTextEncodingASCIIGetBytes(data);

// Send back a response

streamWrite(msg, 0, msgLength);

ConsoleWriteLine("Sent: {0}", data);

}

// Shutdown and end connection

clientClose();

}

}

catch(SocketException e)

{

ConsoleWriteLine("SocketException: {0}", e);

}

finally

{

// Stop listening for new clients

serverStop();

}

ConsoleWriteLine("\nHit enter to continue");

ConsoleRead();

}

}

当然，官方的这个示例是单线程的，一次只能处理一个客户端，你可以将accept到的client扔到一个独立的线程，这样就可以多客户端并发处理了。

time_t t;

struct tm ti;

char buffer[1048], input[1024];

time(&t); //获取时间戳

ti = localtime(&t); //转成详细时间信息

//格式化时间字符串

sprintf(buffer, "%04d/%02d/%02d %02d:%02d:%02d ",

    ti->tm_year + 1900, 

    ti->tm_mon + 1,

    ti->tm_mday,

    ti->tm_hour,

    ti->tm_min,

    ti->tm_sec);

fgets(input, 1024, stdin);

strcat(buffer, input); //连接两个字符串

printf("%s", buffer);

send(sockfd,buffer,strlen(buffer)，0);

//望采纳

1、可以在client端登入时write（发送）帐号和密码给server端，当server端接受到内容时判断是否是你预设的帐号密码，是则允许下载，否则关闭其socket。

2、是要客户端看到进度条？ 这样就要要求在下载文件时server端要先发这个文件的大小给client端，client端就可以通过这个大小和接受到的字节数比较后打印进度条（printf("#");）

文件大小可用int stat(const char restrict path, struct stat restrict buf);函数获取。