TCP/IP客户端服务器通信实现-优快云博客

本文链接：https://blog.youkuaiyun.com/cbacq/article/details/44590901

本文详细阐述了使用TCP/IP协议进行客户端与服务器之间的通信流程，包括socket创建、地址设置、连接建立、数据收发及异常处理等关键步骤。

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客户端

#include <WinSock2.h>
#include <stdio.h>
#pragma comment(lib,"ws2_32.lib")

void main()
{
	WSAData wsadata;
	WSAStartup(MAKEWORD(2,2),&wsadata);
	int sock = socket(AF_INET,SOCK_STREAM,0);
	printf("%d",sock);
	sockaddr_in addr;
	addr.sin_addr.S_un.S_addr = inet_addr("192.168.5.202");
	addr.sin_family = AF_INET;
	addr.sin_port = htons(8892);
	int n = connect(sock,(sockaddr *)&addr,sizeof(addr));
	printf("%d",n);
	if(n == INVALID_SOCKET)
	{
		printf("error = %d",WSAGetLastError());
	}
	else
	{

		while(1)
		{
			char buffer[256];
			int recvived;
			//recvived = recv(sock,buffer,256,0);
			scanf("%s", buffer);
			send(sock, buffer, strlen(buffer) + 1, 0);
			if(buffer =="bye")
			{
				closesocket(sock);
				break;
			}
		}

	}

}

服务端：

#include <WinSock2.h>
#include <stdio.h>
#pragma comment(lib,"ws2_32.lib")


DWORD WINAPI ProcessClientRequests(LPVOID lpParam);

void main()
{
	WSAData wsadata;
	WSAStartup(0x0202,&wsadata);
	HANDLE thread[10];
	int sock =socket(AF_INET,SOCK_STREAM,0);
	//printf("%d",sock);
	SOCKADDR_IN addr;
	addr.sin_addr.S_un.S_addr = htonl(INADDR_ANY);
	addr.sin_family = AF_INET;
	addr.sin_port = htons(8892);

	int n = bind(sock,(sockaddr *)&addr,sizeof(SOCKADDR_IN));
   	//printf("%d",n);
	if(n == SOCKET_ERROR)
	{
		printf("error = %d",WSAGetLastError());
	}
	else
	{
		listen(sock,5);
		int thread_num = 0;
		while (true)
		{
			SOCKADDR_IN addrc;
			int len = sizeof(SOCKADDR_IN);

			SOCKET m_socket = accept(sock, (sockaddr *)&addrc, &len);
			if (thread_num < 10)
			{
				thread[thread_num++] = CreateThread(NULL, 0, ProcessClientRequests, &m_socket, 0, NULL);
			}
			printf("%d\n",thread_num);
		}
	}

	WaitForMultipleObjects(10, thread, true, INFINITE);
	closesocket(sock);

	for (int i = 0; i < 10; i++)
	{
		CloseHandle(thread[i]);
	}
	WSACleanup();
}

DWORD WINAPI ProcessClientRequests(LPVOID lpParam)
{
	SOCKET* clientsocket = (SOCKET*)lpParam;  //这里需要强制转换，注意：指针类型的

	char* msg = "Hello, my client.rn";

	send(*clientsocket, msg, strlen(msg) + sizeof(char), NULL);

	while (TRUE)

	{

		char buffer[MAXBYTE] = { 0 };

		recv(*clientsocket, buffer, MAXBYTE, NULL);

		if (strcmp(buffer, "exit") == 0)

		{
			break;

		}

	}
	closesocket(*clientsocket);

	return 0;
}

客户端要连接的ip为服务端ip，两端口号要一直才可以。