C语言创建TCP连接

[TCP编程]

服务端：

  1、加载套接字，版本号，创建协议:socket();（服务端地址可接受任何IP）
	2、绑定IP,端口  接口sockaddr_in  方法:bind();
	3、增加监听 list;
	4、循环接收数据  accept（）接受客户端的请求;
	4、发送，接受:send(),recv().

#include <stdio.h>
#include <winSock2.h>
#include <stdlib.h>
#include <string.h>
#include <conio.h>
#include <time.h>
#pragma comment(lib,"ws2_32.lib")

#define SERVER_PORT 3947

bool isRunning = false;

SOCKET ServerSocket;
SOCKET ClientSoket;

sockaddr_in serverAddr_in;
sockaddr_in clientAddr_in;

DWORD wVertionRequestion = MAKEWORD(2,2);
WSADATA wsaData;

//接受的信息
char rec[255];


typedef struct CLIENT
{
	SOCKET client;
	char name[20];
	bool isFightding;
	SOCKET enemy;
	char enemyName[20];
	struct CLIENT *next;
}ClientNode,*CLientList;

typedef struct CLIENTSERVER
{
	int size;
	CLientList head;
}ClientServer;

void sendMsg(char *content, char x, char y)
{
	CLientList p = SClient.head->next;
	char name[255];
	char infor[255];
	split(content,':',name,infor);
	if (SClient.size <= 1)
	{
		return;
	}
	while (p&&strcmp(name, p->name))
	{
		p = p->next;
	}
	
	if (p != NULL)
	{

    	send(p->enemy, infor, strlen(infor), 0);
	}
	return;
}

//接受信息线程
DWORD WINAPI reciveMsg(LPVOID parameter)
{
	
	int rc;
	CLientList p;
	while (isRunning)
	{
		p = SClient.head->next;
		
		while (p)
		{
			rc = recv(p->client, rec, sizeof(rec), 0);
			if (rc >= 0)
			{
				rec[rc] = 0x00;
				sendMsg(rec, 1, 2);
			}
			if (rc < 0)
			{
				printf("%s已退出\n", p->name);
				removeClient(p->name);
				break;
			}
			p = p->next;
		}
		
	}
	return NULL;
}

//添加客户端线程
DWORD WINAPI startHere(LPVOID parameter)
{
	char name[20];
	int len;
	
	int add_len = sizeof(clientAddr_in);

	while (true)
	{

		printf("请等候...\n");
		ClientSoket = accept(ServerSocket, (sockaddr *)&clientAddr_in, &add_len);

		if (ClientSoket == INVALID_SOCKET)
		{
			perror("accept");
		}
		isRunning = true;

		//得到客户端的名称...  
		len = recv(ClientSoket, name, sizeof(name), 0);
		if (len > 0)
		{
			name[len] = 0x00;
		}
		if (len < 0)
		{
			isRunning = false;
		}
		printf("建立了与客户端：%s 的链接 IP地址：%s\n", name, inet_ntoa(clientAddr_in.sin_addr));
		createClientList(SClient.head, ClientSoket, name);

		SClient.size++;
		if (SClient.size % 2 == 0)
		{
			matchEnemy(ClientSoket);
		}
		//CreateThread(NULL,0,sendMsg,NULL,0,NULL);
		CreateThread(NULL, 0, reciveMsg, NULL, 0, NULL);

		displayClient(SClient.head);
	}
		
	return NULL;

}


int main()
{
	//随机种子
	srand((int)time(0));
	if (WSAStartup(wVertionRequestion, &wsaData) != 0)
	{
		perror("load socket ");
	}

	//创建套接字
	ServerSocket = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP);
	//绑定IP和端口号
	serverAddr_in.sin_family = AF_INET;
	serverAddr_in.sin_port = htons(SERVER_PORT);
	serverAddr_in.sin_addr.s_addr = INADDR_ANY;
	if (bind(ServerSocket, (sockaddr *)&serverAddr_in, sizeof(serverAddr_in)) == SOCKET_ERROR)
	{
		perror("bind ");
	}
	//增加监听
	if (listen(ServerSocket, 5) == INVALID_SOCKET)
	{
		perror("listen ");
	}
		
	CreateThread(NULL, 0, startHere, NULL, 0, NULL);

	while (true)
	{

	}
	return 0;
}
## 客服端：
		1、加载套接字，版本号，创建协议：socket();（设置IP,地址族...）
		2、与服务器建立链接  connect();
		3、发送，接受：send(),recv().**
```c
#include <winSock2.h>
#include <stdio.h>
#include <conio.h>

#pragma comment(lib,"ws2_32.lib")

#define SERVER_PORT 3947

//用户注册一个账号，方便局域网中操作
char name[20];

SOCKET ServerSocket;

sockaddr_in serveraddr_in;
DWORD wVertionRequestied = MAKEWORD(2,2);
WSADATA wsaData;

//创建接受信息的线程随时接受信息
DWORD WINAPI recive(LPVOID parameter)
{
	char x, y;
	int rc;
	char rec[255];
	while (true)
	{
	
		rc = recv(ServerSocket, rec, sizeof(rec), 0);
		if (rc > 0)
		{
			rec[rc] = 0x00;
			printf("%s\n",rec);
		}
	}
}

DWORD WINAPI sendMsg(LPVOID parameter)
{
	char sendData[255];
	char pos[5];
	int name_len = strlen(name);


	while (true)
	{
		scanf("%s", pos);
		strcat(name, ":");
		strcat(name, pos);

		send(ServerSocket, name, strlen(name), 0);
		name[name_len] = 0x00;
	}

	return NULL;
}

int main()
{
	
	//加载套接字
	int nErr = WSAStartup(wVertionRequestied, &wsaData);
	if (nErr != 0)
	{
		perror("load socket ");
	}

	ServerSocket = socket(AF_INET, SOCK_STREAM,IPPROTO_TCP);

	serveraddr_in.sin_family = AF_INET;
	serveraddr_in.sin_port = htons(SERVER_PORT);
	serveraddr_in.sin_addr.s_addr = inet_addr("127.0.0.1");

	if (connect(ServerSocket, (sockaddr *)&serveraddr_in, sizeof(serveraddr_in)) == SOCKET_ERROR)
	{
		perror("connect ");
	}
	//开启接收信息线程
	CreateThread(NULL,0,recive,NULL,NULL,NULL);

	//第一次发送名字，让服务端添加一个客户端进入
	printf("请输入你的姓名：");
	scanf("%s", name);
	send(ServerSocket,name,strlen(name),0);
	
	printf("对话框：\n");
	printf("##################################################################\n");
	
	CreateThread(NULL, 0, sendMsg, NULL, 0, NULL);

	while (true)
	{

	}
	closesocket(ServerSocket);
	WSACleanup();	
}