计算机网络 | C++实现TCP/UDP的socket通信

仅在VC 6.0上通过

服务器端先运行，客户端向服务器端说”1 1 1 1 1 ”，服务器端每位加1后向客户端说”2 2 2 2 2”，双方循环一定次数后通信结束。

TCP服务器端程序：TCPSev.cpp

#include "stdio.h"
#include 
#include 
#pragma comment(lib,"ws2_32.lib")
void intToChar(int &n,char *pBuf);

void main()
{
	//加载套接字库
	WORD wVerRequested;
	WSADATA wsaData;
	int err;
	
	wVerRequested = MAKEWORD(1,1);
	
	err = WSAStartup(wVerRequested,&wsaData);
	if (err != 0)
	{
		return ;
	}
	
	if (LOBYTE(wsaData.wVersion) != 1 || 
		HIBYTE(wsaData.wVersion) != 1)
	{
		WSACleanup();
		return ;
	}
	
	//创建用于监听的套接字
	SOCKET sockSev  = socket(AF_INET,SOCK_STREAM,0);
	
	//绑定地址信息
	SOCKADDR_IN addSrv;
	addSrv.sin_family = AF_INET;
	addSrv.sin_port = htons(6000);
	addSrv.sin_addr.S_un.S_addr = htonl(INADDR_ANY);
	
	//绑定套接字到制定地址与端口
	bind(sockSev,(SOCKADDR*)&addSrv,sizeof(SOCKADDR));
	//将套接字设置为监听状态
	listen(sockSev,5);
	
	//监听
	SOCKADDR_IN addClient;//客户地址信息
	int len = sizeof(SOCKADDR);
	
	int digit = 0;
	while(1)
	{
		
		char sBuf[100];	
		SOCKET sockConnect = accept(sockSev,(SOCKADDR*)&addClient,&len);
		
		if (sockConnect == -1) {
			printf("错误：客户端无效！\n");
			continue;
		}
		while(1)
		{//有客户链接请求被成功接收
			
			//多次同一ip接收数据
			int n = recv(sockConnect,sBuf,100,0);
			if(n > 0)
			{
				printf("%s\n\n",sBuf);
				
				//转换数据
				digit += 2;
				intToChar(digit,sBuf);
		
				n = send(sockConnect,sBuf,strlen(sBuf)+1,0);
				if(n <= 0)
				{
					printf("Send error!");
					closesocket(sockConnect);
					break;
					
				}
			}
			else if(n < 0)
			{
				printf("Receive error!");
				closesocket(sockConnect);
				printf("%s\n","arg q");
				WSACleanup();
				break;
			}	
		}
		//关闭套接字
		closesocket(sockConnect);
		digit = 0;
	}	
	closesocket(sockSev);
	WSACleanup();
	return;
}


void intToChar(int &n,char *pBuf)
{
	
	*pBuf = NULL;//注意清空
	char cTemp[] = {'0'};
	itoa(n,cTemp,10);
	for(int m = 0;m < 5;m++)
	{
		strcat(pBuf,cTemp);
		strcat(pBuf," ");
	}

}

TCP客户端程序：TCPClient.cpp

#include "stdio.h"
#include "stdlib.h"
#include 
#pragma comment(lib,"ws2_32.lib")
void intToChar(int n,char *pBuf);

void main()
{
	//加载套接字库
	WORD wVerRequested;
	WSADATA wsaData;
	int err;
	
	wVerRequested = MAKEWORD(1,1);
	
	err = WSAStartup(wVerRequested,&wsaData);
	if (err != 0)
	{
		return ;
	}
	
	if (LOBYTE(wsaData.wVersion) != 1 || 
		HIBYTE(wsaData.wVersion) != 1)
	{
		WSACleanup();
		return ;
	}
	
	//创建用于监听的套接字
	SOCKET sockClient = socket(AF_INET,SOCK_STREAM,0);
	
	/********绑定地址信息，其中"127.0.0.1"为*********
	*********主机IP堆栈内部的IP地址，主要用于********
	*********网络软件测试以及本地机进程间通信*******/
	SOCKADDR_IN addSrv;
	addSrv.sin_family = AF_INET;
	addSrv.sin_port = htons(6000);
	addSrv.sin_addr.S_un.S_addr = inet_addr("127.0.0.1");
	
	char sBuf[100] = "1 1 1 1 1";
	int digit = 1;
	//绑定套接字到制定地址与端口
	int res = connect(sockClient,(SOCKADDR*)&addSrv,sizeof(SOCKADDR));
		for(int n = 0;n < 10;n++)
		{
			send(sockClient,sBuf,strlen(sBuf)+1,0);
			while(1)
			{
				//接收数据
				int rSize = recv(sockClient,sBuf,100,0);
			
					printf("%s\n\n",sBuf);	
					//转换数据
					digit += 2;
					intToChar(digit,sBuf);
					break;
			}
		}
		closesocket(sockClient);
		WSACleanup();
		digit= 1;
		return;

}

void intToChar(int n,char *pBuf)
{
	*pBuf = NULL;
	char cTemp[] = {'0'};
	itoa(n,cTemp,10);//注意itoa()函数的用法
	for(int m = 0;m < 5;m++)
	{
		strcat(pBuf,cTemp);
		strcat(pBuf," ");
	}
}

 UDP服务器端程序：UDPSev.cpp

#include "stdio.h"
#include 
#include 
#pragma comment(lib,"ws2_32.lib")
void intToChar(int &n,char *pBuf);
	
void main()
{
	//加载套接字库
	WORD wVerRequested;
	WSADATA wsaData;
	int err;
	
	wVerRequested = MAKEWORD(1,1);
	
	err = WSAStartup(wVerRequested,&wsaData);
	if (err != 0)
	{
		return ;
	}
	
	if (LOBYTE(wsaData.wVersion) != 1 || 
		HIBYTE(wsaData.wVersion) != 1)
	{
		WSACleanup();
		return ;
	}
	
	//创建用于监听的套接字
	SOCKET sockSev  = socket(AF_INET,SOCK_DGRAM,0);
	
	//绑定地址信息
	SOCKADDR_IN addSrv;
	addSrv.sin_family = AF_INET;
	addSrv.sin_port = htons(6000);
	addSrv.sin_addr.S_un.S_addr = htonl(INADDR_ANY);
	
	//绑定套接字到制定地址与端口
	bind(sockSev,(SOCKADDR*)&addSrv,sizeof(SOCKADDR));
	
	SOCKADDR_IN addClient;//客户地址信息
	int len = sizeof(SOCKADDR);
	
	int digit = 0;
	char sBuf[100] = {0};	
	char rBuf[100]  = {0};	

	while(1)
	{
		
		recvfrom(sockSev,rBuf,100,0,(SOCKADDR*)&addClient,&len);
		digit += 2;
		printf("%s\n\n",rBuf);
		intToChar(digit,sBuf);
		sendto(sockSev,sBuf,strlen(sBuf)+1,0,(SOCKADDR*)&addClient,len);
	}	
	closesocket(sockSev);
	WSACleanup();
	digit = 0;
	return;
}


void intToChar(int &n,char *pBuf)
{
	
	*pBuf = NULL;//注意清空
	char cTemp[] = {'0'};
	itoa(n,cTemp,10);
	for(int m = 0;m < 5;m++)
	{
		strcat(pBuf,cTemp);
		strcat(pBuf," ");
	}

}

UDP客户端程序：UDPClient.cpp

#include "stdio.h"
#include "stdlib.h"
#include 
#pragma comment(lib,"ws2_32.lib")
void intToChar(int n,char *pBuf);

void main()
{
	//加载套接字库
	WORD wVerRequested;
	WSADATA wsaData;
	int err;
	
	wVerRequested = MAKEWORD(1,1);
	
	err = WSAStartup(wVerRequested,&wsaData);
	if (err != 0)
	{
		return ;
	}
	
	if (LOBYTE(wsaData.wVersion) != 1 || 
		HIBYTE(wsaData.wVersion) != 1)
	{
		WSACleanup();
		return ;
	}
	
	//创建用于监听的套接字
	SOCKET sockClient = socket(AF_INET,SOCK_DGRAM,0);
	
	/********绑定地址信息，其中"127.0.0.1"为*********
	*********主机IP堆栈内部的IP地址，主要用于********
	*********网络软件测试以及本地机进程间通信*******/
	SOCKADDR_IN addSrv;
	addSrv.sin_family = AF_INET;
	addSrv.sin_port = htons(6000);
	//addSrv.sin_addr.S_un.S_addr = inet_addr("218.199.180.5"); //对方服务器IP
    addSrv.sin_addr.S_un.S_addr = inet_addr("127.0.0.1");

	char sBuf[100] = "1 1 1 1 1";	
	char rBuf[100] ;	
	char tBuf[] =  "1 1 1 1 1";
	int len = sizeof(SOCKADDR);
	int digit = 1;
	int n = 100;
	while(n>0)
	{						sendto(sockClient,sBuf,strlen(sBuf)+1,0,(SOCKADDR*)&addSrv,len);
	    recvfrom(sockClient,rBuf,100,0,(SOCKADDR*)&addSrv,&len);
	
		printf("%s\n\n",rBuf);
		digit += 2;
		intToChar(digit,sBuf);
		n--;
	}

		closesocket(sockClient);
		WSACleanup();
		strcat(sBuf,tBuf);
		digit= 1;
		return;

}

void intToChar(int n,char *pBuf)
{
	*pBuf = NULL;
	char cTemp[] = {'0'};
	itoa(n,cTemp,10);//注意itoa()函数的用法
	for(int m = 0;m < 5;m++)
	{
		strcat(pBuf,cTemp);
		strcat(pBuf," ");
	}
}