WinSocket实现进程通信的一个简单实例

    Windows下通过Socket可以使进程之间产生通信。

    设计上简单地分为服务端和客户端。

服务端：

1. 建立Socket
2. 声明自身的端口号和地址并绑定到Socket
3. 使用Listen打开监听，然后不断用Accept去查看是否有连接，如果有，捕获Socket，并通过Recv获取消息的内容
4. 通信完成后调用CloseSocket关闭这个对应Accept到的Socket，如果不再需要等待任何客户端连接，那么用CloseSocket关闭掉自身的Socket 

客户端：

1. 建立Socket
2. 通过端口号和地址确定目标服务器，使用Connect连接到服务器
3. send发送消息，等待处理
4. 通信完成后调用CloseSocket关闭Socket
   

服务端代码：

#pragma once/*ServerNet.h服务端：建立Socket，声明自身的端口号和地址并绑定到Socket，使用Listen打开监听，然后不断用Accept去查看是否有连接，如果有，捕获Socket，并通过Recv获取消息的内容，通信完成后调用CloseSocket关闭这个对应Accept到的Socket，如果不再需要等待任何客户端连接，那么用CloseSocket关闭掉自身的Socket*/#include<stdio.h>#include<windows.h>#pragma comment(lib, "Ws2_32.lib")class ServerNet{private:SOCKET m_sock;public://  初始化服务器int ServerInit(const char* address, int port);// 更新数据void ServerRun();};

/*ServerNet.cpp*/#include"ServerNet.h"/*服务器初始化*/int ServerNet::ServerInit(const char* address, int port){int rlt = 0;int iErrorMsg;//初始化WinSockWSAData wsaData;iErrorMsg = WSAStartup(MAKEWORD(1, 1), &wsaData);if (iErrorMsg != NO_ERROR){//初始化WinSock失败printf("server wsastartup failed with error : %d\n", iErrorMsg);rlt = 1;return rlt;}// 创建服务器端socketm_sock = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP);if (m_sock == INVALID_SOCKET)// 创建socket出现了异常{printf("server socket failed with error: %d\n", WSAGetLastError());rlt = 2;return rlt;}// 声明信息SOCKADDR_INservaddr;servaddr.sin_family = AF_INET;servaddr.sin_port = port;servaddr.sin_addr.s_addr = inet_addr(address);//绑定iErrorMsg = bind(m_sock, (SOCKADDR*)&servaddr, sizeof(servaddr));if (iErrorMsg < 0){//绑定失败printf("bind failed with error : %d\n", iErrorMsg);rlt = 3;return rlt;}return rlt;}void ServerNet::ServerRun(){// 公开连接listen(m_sock, 5);SOCKADDR_IN tcpAddr;int len = sizeof(sockaddr);SOCKET newSocket;char buf[1024];int rval;do{// 接收信息newSocket = accept(m_sock, (sockaddr*)&tcpAddr, &len);if (newSocket == INVALID_SOCKET){// 非可用socketprintf("invalid socket occured.\n");}else{// 可用的新socket连接printf("new socket connect: %d\n", newSocket);// 消息处理do{//printf("process\n");// 接收数据memset(buf, 0, sizeof(buf));rval = recv(newSocket, buf, 1024, 0);if (rval == SOCKET_ERROR)// 该异常通常发生在未closeSocket就退出时{printf("recv socket error.\n");break;}else if (rval == 0)// 0表示正常退出printf("socket %d connect end.\n", newSocket);else// 显示接收到的数据printf("recv msg: %s\n", buf);} while (rval != 0);// 关于接收的socketclosesocket(newSocket);}} while (1);// 关闭自身socketclosesocket(m_sock);}

#include"ServerNet.h"int main(){ServerNet serverNet;int iRlt = serverNet.ServerInit("127.0.0.1", 8888);if (iRlt == 0){printf("servr init successful.\n");serverNet.ServerRun();}elseprintf("server init failed with error: %d\n", iRlt);system("pause");}

客户端代码：

#pragma once/*ClinetNet.h客户网络*/#include<stdio.h>#include<windows.h>#pragma comment(lib, "Ws2_32.lib")class ClientNet{private:SOCKET m_sock;public:// 连接指定的服务器int ClientConnect(int port, const char* address);// 发送信息int ClientSend(const char* msg, int len);// 关闭连接void ClientClose();};

/*ClientNet.cpp*/#include"ClientNet.h"/*客户端Socket连接*/int ClientNet::ClientConnect(int port, const char* address){int rlt = 0;   //connectflag  0-success 1-WSAStartfailed 2-socketfailed 3-connectfailed// 记录错误信息int iErrMsg;// 启动WinSockWORD wVersionRequested;WSADATA wsaData;wVersionRequested = MAKEWORD(1, 1);iErrMsg = WSAStartup(wVersionRequested, &wsaData);if (iErrMsg != NO_ERROR)// WSAStartup出现了错误{printf("failed with WSAStartup error: %d\n", iErrMsg);rlt = 1;return rlt;}// 创建Socketm_sock = socket(AF_INET, SOCK_STREAM, 0);if (m_sock==INVALID_SOCKET)// socket出现了错误{printf("failed with socket error: %d\n", WSAGetLastError());rlt = 2;return rlt;}// 目标服务器数据SOCKADDR_IN servaddr;servaddr.sin_family = AF_INET;servaddr.sin_port = port;servaddr.sin_addr.s_addr = inet_addr(address);// sock与目标服务器连接iErrMsg = connect(m_sock, (SOCKADDR*)&servaddr, sizeof(servaddr));if (iErrMsg != NO_ERROR){printf("failed with connect error: %d\n", iErrMsg);rlt = 3;return rlt;}// successreturn rlt;}/*客户端发送消息*/int ClientNet::ClientSend(const char* msg, int len){int rlt = 0;int iErrMsg = 0;// 指定sock发送消息iErrMsg = send(m_sock, msg, len, 0);if (iErrMsg < 0)// 发送失败{printf("send msg failed with error: %d\n", iErrMsg);rlt = 1;return rlt;}printf("send msg successfully\n");return rlt;}/*客户端关闭Socket*/void ClientNet::ClientClose(){closesocket(m_sock);}

#include<iostream>#include<string>#include"ClientNet.h"using namespace std;int main(){ClientNet client;int rlt = 0;string msg;//memset(msg, 0, sizeof(msg));//连接到127.0.0.1（即本地）,端口号为8888的服务端printf("connecting.....\n");rlt = client.ClientConnect(8888, "127.0.0.1");if (rlt == 0)// socket连接成功{//发送消息printf("connect successfully. input  q to quit\n");printf("-------------------------\n");while (1){printf("msg input: ");getline(cin, msg);if (msg == "q")break;else{printf("sending msg.....\n");rlt = client.ClientSend(msg.c_str(), msg.length());}}// 关闭socketprintf("closing socket.....\n");client.ClientClose();}system("pause");return 0;}

通信示例如下图：