【windows】C++网络编程一

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#include <winsock2.h>
#pragma comment(lib,"WS2_32.lib")

以下实现简单的基于TCP协议的C/S程序

1. 编写服务端

主要流程：

加载ws2_32.dll ==》创建套字节 ==》绑定端口 ==》监听 ==》接收/发送 ==》关闭套字节 ==》释放ws2_32.dll

SocketServer.cpp ：

[cpp] view plain copy

#include "StdAfx.h"
#include "SocketServer.h"
using namespace std;
/**
* 功能描述：服务端类
* 作者：herong
* 日期：2011/12/06
*/

[cpp] view plain copy

SocketServer::SocketServer(const char* ip,const u_short port)
{
//用来接收winsocket实现的细节
WSADATA wsaData;
//初始化ws2_32.dll动态链接库
//提供给调用方可使用的最高版本号,高位为副版本号，低位为主版本号
WSAStartup(MAKEWORD(2,2),&wsaData);
//创建套字节
SOCKET s = socket(PF_INET,SOCK_STREAM,IPPROTO_TCP);
sockaddr_in sockaddr;
sockaddr.sin_family = PF_INET;
sockaddr.sin_addr.S_un.S_addr = inet_addr(ip);
sockaddr.sin_port = htons(port);
//绑定IP地址和端口
int iResult = bind(s,(SOCKADDR*)&sockaddr,sizeof(SOCKADDR));
if (iResult == SOCKET_ERROR) {
//关闭套字节
closesocket(s);
s = INVALID_SOCKET;
//释放ws2_32.dll动态链接库
WSACleanup();
throw "绑定IP地址和端口失败!";
}
//监听
iResult = listen(s,1);
if (iResult == SOCKET_ERROR) {
//关闭套字节
closesocket(s);
s = INVALID_SOCKET;
//释放ws2_32.dll动态链接库
WSACleanup();
throw "监听失败!";
}
SOCKADDR clientAddr;
int nSize = sizeof(SOCKADDR);
clientSock = accept(s,(SOCKADDR*)&clientAddr,&nSize);
if (clientSock == INVALID_SOCKET) {
//关闭套字节
closesocket(s);
s = INVALID_SOCKET;
//释放ws2_32.dll动态链接库
WSACleanup();
throw "接受连接失败!";
}
cout<< "服务器已启动"<<std::endl;
}
SocketServer::~SocketServer(void)
{
//关闭客户端套字节
closesocket(clientSock);
//关闭套字节
closesocket(s);
//释放ws2_32.dll动态链接库
WSACleanup();
}
int SocketServer::sendMsg(char* msg){
return send(clientSock,msg,strlen(msg)+sizeof(char),NULL);
}
int SocketServer::recvMsg(string& msg) {
int recvByte = 0;
char recvMsg[BUF_SIZE] = {0};
recvByte = recv(clientSock,recvMsg,BUF_SIZE,0);
msg.append(recvMsg);
cout<<"收到信息("<<recvByte<<"):"<< msg <<std::endl;
return recvByte;
}
void SocketServer::start() {
try {
string msg;
while (TRUE) {
recvMsg(msg);
dispacth(msg.c_str());
msg.clear();
}
} catch (...) {
cout << "出现异常";
exit(-1);
}
}
void SocketServer::dispacth(const char * msg) {
cout << "CMD:"<<msg<<std::endl;
if (!strcmp(msg,"exit")) {
cout<<"客户端退出!";
exit(0);
}
if (!strcmp(msg,"getInfo")) {
char* getInfo ="查询结果!";
sendMsg(getInfo);
return;
}
char* noneInfo ="无信息!";
sendMsg(noneInfo);
}

2. 编写客户端程序

主要流程：

加载ws2_32.dll ==》创建套字节 ==》连接服务端 ==》接收/发送 ==》关闭套字节 ==》释放ws2_32.dll

ClientSocket.cpp ：

[cpp] view plain copy

#include "StdAfx.h"
#include "ClientSocket.h"
using namespace std;
/**
* 功能描述：客户端类
* 作者：herong
* 日期：2011/12/06
*/

[cpp] view plain copy

ClientSocket::ClientSocket(const char* ip,const u_short port)
{
//用来接收winsocket实现的细节
WSADATA wsaData;
//初始化ws2_32.dll动态链接库
//提供给调用方可使用的最高版本号,高位为副版本号，低位为主版本号
WSAStartup(MAKEWORD(2,2),&wsaData);
//创建套字节
server = socket(PF_INET,SOCK_STREAM,IPPROTO_TCP);
sockaddr_in sockaddr;
sockaddr.sin_family = PF_INET;
sockaddr.sin_addr.S_un.S_addr = inet_addr(ip);
sockaddr.sin_port = htons(port);
//连接服务器
int iResult = connect(server,(SOCKADDR*)&sockaddr,sizeof(SOCKADDR));
if (iResult == SOCKET_ERROR) {
//关闭套字节
closesocket(server);
server = INVALID_SOCKET;
//释放ws2_32.dll动态链接库
WSACleanup();
throw "连接服务器失败!";
}
}
ClientSocket::~ClientSocket(void)
{
//关闭套字节
closesocket(server);
server = INVALID_SOCKET;
//释放ws2_32.dll动态链接库
WSACleanup();
}
int ClientSocket::sendMsg(char* msg,int len) {
cout<<"发送信息:"<<msg<<std::endl;
return send(server,msg,strlen(msg)+sizeof(char),0);
//return send(server,msg,len,0);
}
int ClientSocket::recvMsg(string& msg) {
int recvByte = 0;
char recvMsg[BUF_SIZE] = {0};
recvByte = recv(server,recvMsg,BUF_SIZE,0);
msg.append(recvMsg);
cout<<"收到信息("<<recvByte<< "):" << msg <<std::endl;
return recvByte;
}
void ClientSocket::start(){
try {
char cmd[512] = {0};
string msg;
while (TRUE) {
cin >> cmd;
sendMsg(cmd,1024);
if (!strcmp(cmd,"exit")){
cout << "退出系统!";
break;
}
recvMsg(msg);
msg.clear();
msg.clear();
}
} catch (...) {
cout << "出现异常";
exit(-1);
}
}

3. 编写服务端主程序

[cpp] view plain copy

// server.cpp : 定义控制台应用程序的入口点。
//
#include "stdafx.h"
#include "SocketServer.h"
int _tmain(int argc, _TCHAR* argv[])
{
SocketServer server("127.0.0.1",8080);
server.start();
return 0;
}

4. 编写客户端主程序

[cpp] view plain copy

// client.cpp : 定义控制台应用程序的入口点。
//
#include "stdafx.h"
#include "ClientSocket.h"
int _tmain(int argc, _TCHAR* argv[])
{
ClientSocket client("127.0.0.1",8080);
client.start();
return 0;
}

演示：

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