Server_int len = sizeof(server)-优快云博客

本文链接：https://blog.youkuaiyun.com/azymq/article/details/24867431

本文介绍了一个简单的TCP服务器程序设计，包括网络环境初始化、套接字创建、客户端连接处理、数据接收及发送等功能。通过示例代码展示了如何使用Windows Socket API进行网络编程。

摘要生成于 C知道，由 DeepSeek-R1 满血版支持，前往体验 >

// Server.cpp : 定义控制台应用程序的入口点。
//

#include "stdafx.h"
#include <Windows.h>
#include <vector>
#include <algorithm>
using namespace std;
#pragma comment(lib,"ws2_32.lib")

	vector<SOCKET> socketArry(10,0);
int initWSA()
{
	WSADATA wsaData;
	if(0!=WSAStartup(MAKEWORD(2,2),&wsaData))
	{
		printf("初始化网络失败错误代码 =%d",WSAGetLastError());
		WSACleanup();
		return 0;
	}

	printf("网络环境初始化成功!");
	return 1;

}


SOCKET createSocket()
{
	SOCKET serverSocket =socket(AF_INET,SOCK_STREAM,0);
	if (serverSocket == INVALID_SOCKET )
	{
		printf("创建套接字失败!错误代码=%d",WSAGetLastError());
		closesocket(serverSocket);
	}
	else
		printf("创建套接字成功!\n");
	return serverSocket;
	
}

void SendBuff(SOCKET s,char *buff,int len)
{
	vector<SOCKET>::iterator it = socketArry.end();
	for (vector<SOCKET>::iterator i= socketArry.begin();i!=it;i++ )
	{
		if (*i!=0)
		{
			int dataLen = len;
			int sendLen =0;
			int sendCount =0;
			while(dataLen>0)
			{
				sendLen = send(*i,buff+sendCount,dataLen-sendLen,0);
				if (sendLen==SOCKET_ERROR )
				{
					printf("发送给客户端出错\n");
					break;
				}
				if (sendLen ==0)
				{
					printf("客户端已经关闭\n");
					break;
				}
				sendCount+=sendLen;
				dataLen-=sendLen;
			}

		}
	}
}

void RecvData(SOCKET s,char *buf,int& len)
{
	char buff[2048];
	int recvLen=0;
	int countDatalen =0;
	while(1)
	{
		if (countDatalen>2048)
		{
			printf("数据太大!\n");
			break;;
		}
		recvLen =recv(s,buff+countDatalen,sizeof(buff)-countDatalen,0);
		countDatalen+=recvLen;
		if (recvLen ==0)
		{
			printf("客户端socket已经关闭\n");
			vector<SOCKET> ::iterator i = find(socketArry.begin(),socketArry.end(),s);
			if(i!=socketArry.end())
				*i = 0;
			break;
		}
		else if (recvLen<sizeof(buff))
		{
			printf("数据接收完成!\n");
			break;;
		}
	}

	memcpy(buf,buff,countDatalen);
	len = countDatalen;
}

int _tmain(int argc, _TCHAR* argv[])
{
//	SOCKET socketArry[10];

//	socketArry.push_back(INVALID_SOCKET);
//	vector<SOCKET>::iterator i= socketArry.begin();
//	socketArry.insert(i,INVALID_SOCKET);
//	*i = INVALID_SOCKET;
	int size = socketArry.size();
//	memset(socketArry,0,sizeof(socketArry));
	if (!initWSA())
		goto mark;

	SOCKET ServerSocket = createSocket();
	if (ServerSocket == INVALID_SOCKET)
		goto mark;


	SOCKADDR_IN serverInfo;
	serverInfo.sin_family = AF_INET;
	serverInfo.sin_port = htons(9100);
	serverInfo.sin_addr.S_un.S_addr = inet_addr("127.0.0.1");
	int infoLen = sizeof(serverInfo);

	int err =bind(ServerSocket,(SOCKADDR*)&serverInfo,infoLen);
	if (err !=0)
	{
		printf("绑定IP=%s,端口=%d失败!错误代码=%d\n",inet_ntoa(serverInfo.sin_addr),ntohs(serverInfo.sin_port),WSAGetLastError());
		closesocket(ServerSocket);
		goto mark;
	}
	printf("绑定IP=%s,端口=%d成功!\n",inet_ntoa(serverInfo.sin_addr),ntohs(serverInfo.sin_port));

	err = listen(ServerSocket,10);
	if(err == SOCKET_ERROR )
		{
			printf("监听失败!错误代码=%d",WSAGetLastError());
			goto mark;
	}
	while(1)
	{
		int index =0;
		printf("端口正在监听....");
		SOCKADDR_IN ClientInfo;
		int inFoLen = sizeof(ClientInfo);
		SOCKET ClientSoocket= accept(ServerSocket,(SOCKADDR*)&ClientInfo,&inFoLen);
		if (ClientSoocket == INVALID_SOCKET)
		{
			closesocket(ClientSoocket);
			printf("客户端连接请求失败!错误代码=%d\n",WSAGetLastError());
			goto mark;
		}
		printf("客户端:%s 连接端口=%d成功\n",inet_ntoa(ClientInfo.sin_addr),ntohs(ClientInfo.sin_port));
/*		for (int i=0; i<10;i++)
		{
			if (socketArry[i] == 0)
			{
				socketArry[i] = ClientSoocket;
			}
		}

*/

		vector<SOCKET> ::iterator i = find(socketArry.begin(),socketArry.end(),0);
		if(i!=socketArry.end())
			*i = ClientSoocket;
		char buff[2048];
		int len =0;
		RecvData(ClientSoocket,buff,len);
			printf("客户端:%s 发来数据%s\n",inet_ntoa(ClientInfo.sin_addr),buff);

			SendBuff(ClientSoocket,buff,len);
		} 

	
	
mark: system("pause");
	WSACleanup();
	closesocket(ServerSocket);
	return 0;
}