windows 下C語言socket編程

之前一直在Linux系統開發C語言的socket，由於項目的需要  需要在windows下開發，第一次在windows下開

發，順便記錄下來。

首先socket的通信流程：

Server程序：

1 .創建socket:socket();

2. 綁定socket的IP+端口號：bind();

3.監聽端口號：listen();

4.接收客戶端的連接請求：accept();

5.讀寫客戶端：recv(),send();

6.關閉socket；close();

Client程序：

1.創建socket：socket();

2.連接指定計算的端口：connect();

3.發送或者手服務器的數據：send(),recv();

4.關閉socket：close();

 socket是基於TCP/IP通信協議的，下圖爲三次握手：

服務器端代碼：

#include <stdlib.h>
#include <stdio.h>
#include <winsock2.h>
#include <windows.h>
#pragma comment(lib,"ws2_32.lib")
 
int main(int argc, char* argv[])
{
	//初始化WSA
	WORD sockVersion = MAKEWORD(2, 2);
	WSADATA wsaData;
	if (WSAStartup(sockVersion, &wsaData) != 0)
	{
		return 0;
	}
 
	//創建套接字
	SOCKET slisten = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP);
	if (slisten == INVALID_SOCKET)
	{
		printf("socket error !");
		return 0;
	}
 
	//綁定IP和端口
	struct sockaddr_in sin;
	sin.sin_family = AF_INET;
	sin.sin_port = htons(8888);
	sin.sin_addr.S_un.S_addr = INADDR_ANY;
	if (bind(slisten, (LPSOCKADDR)&sin, sizeof(sin)) == SOCKET_ERROR)
	{
		printf("bind error !");
	}
 
	//開始監聽
	if (listen(slisten, 5) == SOCKET_ERROR)
	{
		printf("listen error !");
		return 0;
	}
 
	//循環接收數據
	SOCKET sClient;
	struct sockaddr_in remoteAddr;
	int nAddrlen = sizeof(remoteAddr);
	//char revData[255];
	printf("等待連接...\n");
	sClient = accept(slisten, (SOCKADDR *)&remoteAddr, &nAddrlen);
	while (1)
	{
		char revData[255];
		//printf("等待連接...\n");
		//sClient = accept(slisten, (SOCKADDR *)&remoteAddr, &nAddrlen);
		if (sClient == INVALID_SOCKET)
		{
			printf("accept error !");
			continue;
		}
		printf("接受到一個連接：%s \r\n", inet_ntoa(remoteAddr.sin_addr));
 
		//接收數據
		int ret = recv(sClient, revData, 255, 0);
		//printf(ret);
		if (ret > 0)
		{
			revData[ret] = 0x00;
			printf(revData);
		}
		//發送數據
		char * sendData = "你好，TCP客戶端！\n";
		send(sClient, sendData, strlen(sendData), 0);
	}
		closesocket(sClient);
	closesocket(slisten);
	WSACleanup();
	return 0;
}

客戶端代碼：

#include <stdio.h>
#include <stdlib.h>
#include <winsock2.h>
#include <windows.h>
#pragma comment(lib,"ws2_32.lib")
#include <STDIO.H>
int main(int argc, char* argv[])
{
	WORD sockVersion = MAKEWORD(2, 2);
	WSADATA data;
	if (WSAStartup(sockVersion, &data) != 0)
	{
		return 0;
	}
 
	SOCKET sclient = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP);
	if (sclient == INVALID_SOCKET)
	{
		printf("invalid socket !");
		return 0;
	}
 
	struct sockaddr_in serAddr;
	serAddr.sin_family = AF_INET;
	serAddr.sin_port = htons(8888);
	serAddr.sin_addr.S_un.S_addr = inet_addr("127.0.0.1");
	if (connect(sclient, (struct sockaddr *)&serAddr, sizeof(serAddr)) == SOCKET_ERROR)
	{
		printf("connect error !");
		closesocket(sclient);
		return 0;
	}
	for (int i = 0; i < 1000; i++)
	{
 
		char * sendData = "csi接收  二進制文件未解析\n";
		send(sclient, sendData, strlen(sendData), 0);
		char recData[255];
		/*int ret = recv(sclient, recData, 255, 0);
		if (ret > 0)
		{
	
			recData[ret] = 0x00;
			//printf(recData);
			printf("%d%s",i,recData);
		}
		*/
	}
	closesocket(sclient);
	WSACleanup();
	return 0;
}

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