c++ socket编程(c++ socket编程 linux)

Socket 是winsock里的原始套接字开发接口API，c++/java他们是开发语言，而socket是一种通讯标准简称。首先，2者提供的接口不同（主要是封装形式不同），java本身不带socket通讯底层实现的，而是通过调用系统底层的winsockAPI进行的二次封装，而c/c++的socket可以理解为更接近系统层面的winsock,所以c/c++的socket可以提供更多的底层扩展与控制。其次，从语言上讲，用JAVA发开出来的socket程序可以在任何支持JAVA虚拟机上运行，不用修改任何代码。而C/c++ 要根据系统特性进行适当的修改。

C++通过socket编程实现服务端与客户端的通讯，代码如下（个人环境下测试正常，如果遇到运行send发送报错，请检查服务器端口是否被占用，调试的时候请先运行服务端程序在运行客服端，一定要加载库函数ws2_32.lib，发送字符时应该多加一个空字符作为结束字符）： 服务器端程序：12345678910111213141516171819202122232425262728293031323334353637383940414243444546474849505152535455565758596061626364656667686970717273747576777879808182838485868788899091929394959697// Server.cpp : Defines the entry point for the console application.#include "winsock2.h"#pragma comment(lib, "ws2_32.lib")#include using namespace std;int main(int argc, char* argv[]){const int BUF_SIZE = 64;WSADATAwsd;//WSADATA变量SOCKETsServer;//服务器套接字SOCKETsClient;//客户端套接字SOCKADDR_INaddrServ;;//服务器地址charbuf[BUF_SIZE];//接收数据缓冲区charsendBuf[BUF_SIZE];//返回给客户端得数据intretVal;//返回值//初始化套结字动态库if (WSAStartup(MAKEWORD(2,2), &wsd) != 0){cout << "WSAStartup failed!" << endl;return 1;}//创建套接字sServer = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP);if(INVALID_SOCKET == sServer){cout << "socket failed!" << endl;WSACleanup();//释放套接字资源;return-1;}//服务器套接字地址addrServ.sin_family = AF_INET;addrServ.sin_port = htons(4999);addrServ.sin_addr.s_addr = INADDR_ANY;//绑定套接字retVal = bind(sServer, (LPSOCKADDR)&addrServ, sizeof(SOCKADDR_IN));if(SOCKET_ERROR == retVal){cout << "bind failed!" << endl;closesocket(sServer);//关闭套接字WSACleanup();//释放套接字资源;return -1;}//开始监听retVal = listen(sServer, 1);if(SOCKET_ERROR == retVal){cout << "listen failed!" << endl;closesocket(sServer);//关闭套接字WSACleanup();//释放套接字资源;return -1;}//接受客户端请求sockaddr_in addrClient;int addrClientlen = sizeof(addrClient);sClient = accept(sServer,(sockaddr FAR*)&addrClient, &addrClientlen);if(INVALID_SOCKET == sClient){cout << "accept failed!" << endl;closesocket(sServer);//关闭套接字WSACleanup();//释放套接字资源;return -1;}while(true){//接收客户端数据ZeroMemory(buf, BUF_SIZE);retVal = recv(sClient, buf, BUF_SIZE, 0);if (SOCKET_ERROR == retVal){cout << "recv failed!" << endl;closesocket(sServer);//关闭套接字closesocket(sClient);//关闭套接字WSACleanup();//释放套接字资源;return -1;}if(buf[0] == '0')break;cout << "客户端发送的数据: " << buf <> sendBuf;send(sClient, sendBuf, strlen(sendBuf), 0);}//退出closesocket(sServer);//关闭套接字closesocket(sClient);//关闭套接字WSACleanup();//释放套接字资源;return 0;}客户端程序：123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869707172#include "winsock2.h"#include #pragma comment(lib, "ws2_32.lib")using namespace std;BOOL RecvLine(SOCKET s, char* buf); //读取一行数据int main(int argc, char* argv[]){const int BUF_SIZE = 64;WSADATA wsd; //WSADATA变量SOCKET sHost; //服务器套接字SOCKADDR_IN servAddr; //服务器地址char buf[BUF_SIZE]; //接收数据缓冲区char bufRecv[BUF_SIZE];int retVal; //返回值//初始化套结字动态库if (WSAStartup(MAKEWORD(2,2), &wsd) != 0){cout << "WSAStartup failed!" << endl;return -1;}//创建套接字sHost = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP);if(INVALID_SOCKET == sHost){cout << "socket failed!" << endl;WSACleanup();//释放套接字资源return-1;}//设置服务器地址和端口servAddr.sin_family =AF_INET;servAddr.sin_addr.s_addr = inet_addr("127.0.0.1");servAddr.sin_port = htons((short)4999);int nServAddlen= sizeof(servAddr);//连接服务器retVal=connect(sHost,(LPSOCKADDR)&servAddr, sizeof(servAddr));if(SOCKET_ERROR == retVal){cout << "connect failed!" << endl;closesocket(sHost); //关闭套接字WSACleanup(); //释放套接字资源return -1;}while(true){//向服务器发送数据ZeroMemory(buf, BUF_SIZE);cout << " 向服务器发送数据:";cin >> buf;retVal = send(sHost, buf, strlen(buf), 0);if (SOCKET_ERROR == retVal){cout << "send failed!" << endl;closesocket(sHost); //关闭套接字WSACleanup(); //释放套接字资源return -1;}//RecvLine(sHost, bufRecv);ZeroMemory(bufRecv, BUF_SIZE);recv(sHost, bufRecv,BUF_SIZE , 0); // 接收服务器端的数据， 只接收5个字符cout << endl <<"从服务器接收数据："<< bufRecv;cout<<"n";}//退出closesocket(sHost); //关闭套接字WSACleanup(); //释放套接字资源return 0; }

#include #include #include #pragma comment (lib, "Ws2_32.lib")unsigned int __stdcall listeningThread(void *param){ SOCKET sockSrv = socket(AF_INET, SOCK_STREAM, 0); SOCKADDR_IN addrSrv; addrSrv.sin_addr.S_un.S_addr = htonl(INADDR_ANY); addrSrv.sin_family = AF_INET; addrSrv.sin_port = htons((int)param); int ret = bind(sockSrv, (SOCKADDR*) &addrSrv, sizeof(SOCKADDR)); ret = listen(sockSrv, 5); SOCKADDR_IN addrClient; int len = sizeof(SOCKADDR); while (1) { SOCKET sockConn = accept(sockSrv, (SOCKADDR*) &addrClient, &len); char sendBuf [] = "Hello World !"; send(sockConn, sendBuf, strlen(sendBuf) + 1, 0); char recvBuf[50]; recv(sockConn, recvBuf, 50, 0); printf("%sn", recvBuf); closesocket(sockConn); } return 0;}void main(){ WORD wVersionRequested; WSADATA wsaData; int err; wVersionRequested = MAKEWORD(2, 2); err = WSAStartup(wVersionRequested, &wsaData); if (err != 0) { return; } _beginthreadex(NULL, 0, listeningThread, (void *) 8120, 0, NULL); _beginthreadex(NULL, 0, listeningThread, (void *) 8121, 0, NULL); Sleep(INFINITE);}这个是windows平台的，创建两个线程，分别处理两个监听端口，端口通过参数传进去
考虑用select系统调用吧，具体例子请自己找找 #include int select(int maxfdp1, fd_set *restrict readfds,fd_set *restrict writefds, fd_set*restrict exceptfds, struct timeval *restrict tvptr);

1.构造CSocket对象，如以下的形式： CSocket Serversocket；2.利用CSocket对象的Create()函数创建Windows Socket，Create()函数会调用Bind()函数将此Socket绑定到指定的地址上，其原型为：BOOL Create (UINT nSocketPort = 0,int nSocketType = SOCK_STREAM,LPCTSTR lpszSocketAddress = NULL);其中nSocketPort参数指定通信连接的端口号，端口号可以任意指定，但最好不要使用系统默认的一些端口号，例如21是FTP文件传输使用的端口号；3.Socket创建完毕之后，在服务器端进行监听客户的连接请求，使用如下的代码：ServerSocket.Listen();紧接着对于客户端而言，将会调用Connect()函数向服务器发送连接请求，而对于服务器而言，则会调用Accept()函数对客户端发送过来的请求连接进行接受和处理，Accept()函数可以创建一个和监听Socket相同的连接Socket来处理客户的请求，二原来的Socket仍然处于监听状态，使用的形式如下。客户端：ClientSocket.Connect(服务器的地址，服务器的端口号);服务器端：CSocket ReceiveSocket；ServerSocket.Accept(连接Socket，客户的地址结构，客户地址结构的长度)4.对于数据流服务器类型而言，服务器和客户各自通过调用函数来完成数据的发送和接受，使用如下的语句：ServerReceive.Receive(缓冲区，缓冲区的长度，接受标志位);Client.Send(缓冲区，缓冲区的长度，发送标志位);5.在客户端与服务器端的数据传输完成之后，调用下述语句，释放Socket所占有的资源。ServerSocket.Close();ReceiveSocket.Close(); ClientSocket.Close();

//从我以前的一个程序里面抠一段出来给你看看 //客户端用不到bind、accept的#include using namespace std;namespace NetWorks{#include #include "winsock2.h"#pragma comment(lib,"Ws2_32.lib")#define BUFFSIZE 65535#define HTTP_GET "GET %s HTTP/1.1rnAccept: */*rnAccept-Language: zh-cnrnUA-CPU: x86rnAccept-Encoding: gzip, deflaternUser-Agent: KingKe/3.0 (USTC0611)rnHost: %srnConnection: Keep-AlivernCookie: %srnrn"#define HTTP_POST "POST /%s HTTP/1.1rnAccept: */*rnAccept-Language: zh-cnrnUA-CPU: x86rnAccept-Encoding: gzip, deflaternUser-Agent: KingKe/3.0 (USTC0611)rnHost: %srnContent-Type: application/x-www-form-urlencodedrnContent-Length: %drnConnection: Keep-Alivernrn%srnrn"typedef struct sockaddr_in NetAddr;bool Start;class WinSocket{public:WSADATA wsd;int Socket;int Error;char *Buff;NetAddr Destination;WinSocket(int AF,int Type,int Protocol);int Connect(const char*name,int PortNum=80){HOSTENT* Host;Host=gethostbyname(name);memcpy(&Destination.sin_addr, Host->h_addr_list[0],Host->h_length);Destination.sin_family = Host->h_addrtype;Destination.sin_port = htons(PortNum);Socket=socket(AF_INET,SOCK_STREAM,0);Error=connect(Socket,(struct sockaddr*)&Destination, sizeof(Destination));return 1;}int Send(char*SendBuffer){return send(Socket,SendBuffer,strlen(SendBuffer),0);}int Receive(char*ReceiveBuffer){return recv(Socket,ReceiveBuffer,BUFFSIZE,0);}void Close(){closesocket(Socket);}~WinSocket(){closesocket(Socket);}};}using namespace NetWorks;void main(int argc,char *arg[]){char Buff[BUFFSIZE]="";char host[50]="202.38.11.11";//主机char dir[50]="/index.html";//页面相对路径WSADATA wsd;WSAStartup(WINSOCK_VERSION,&wsd);WinSocket WS;WS.Connect(host);sprintf(Buff,HTTP_GET,dir,host,"");//GET方法//sprintf(Buff,HTTP_GET,dir,host,"");//POST方法WS.Send(Buff);Buff[WS.Receive(Buff)]=0;cout<