客户端、服务端通信值统计字符串个数【网络程序设计

实验要求

基于Windows平台，通过WinSocket实现客户端通信。客户端输入一串字符串，由服务器返回该字符串长度，在客户端上显示该长度。

Code

server.c

#include <stdio.h>
#include <winsock2.h>
 
#pragma comment(lib,"ws2_32.lib")
typedef struct sockaddr_in sockaddr_in;
typedef struct sockaddr sockaddr;
 
int main(int argc, char* argv[])
{
	//初始化WSA
	WORD sockVersion = MAKEWORD(2,2);
	WSADATA wsaData;
	if(WSAStartup(sockVersion, &wsaData)!=0)
	{
		return 0;
	}
 
	//创建套接字
	SOCKET slisten = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP);	
	if(slisten == INVALID_SOCKET)
	{
		printf("socket error !");
		return 0;
	}
 
	//绑定IP和端口
	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 !");
	}
 
	//开始监听
	if(listen(slisten, 5) == SOCKET_ERROR)
	{
		printf("listen error !");
		return 0;
	}
 
	//循环接收数据
	SOCKET sClient;
	sockaddr_in remoteAddr;
	int nAddrlen = sizeof(remoteAddr);
	char revData[255]; 
	while (1)
	{
		printf("等待连接...
");
		sClient = accept(slisten, (SOCKADDR *)&remoteAddr, &nAddrlen);
		if(sClient == INVALID_SOCKET)
		{
			printf("accept error !");
			continue;
		}
		printf("接受到一个连接：%s 
", inet_ntoa(remoteAddr.sin_addr));
		
		//接收数据
		int ret = recv(sClient, revData, 255, 0);		
		if(ret > 0)
		{
			revData[ret] = 0x00;
			printf(revData);
		}
 
		//发送数据		
		char sendData[256];
		sprintf(sendData,"%d",ret);
		//const char * sendData = "你好，TCP客户端！
";
		send(sClient, sendData, strlen(sendData), 0);
		closesocket(sClient);
	}
	
	closesocket(slisten);
	WSACleanup();
	return 0;
}

client.c

#include <WINSOCK2.H>
#include <STDIO.H>

#pragma  comment(lib,"ws2_32.lib")
typedef struct sockaddr_in sockaddr_in;
typedef struct sockaddr sockaddr;

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;
	}

	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, (sockaddr *)&serAddr, sizeof(serAddr)) == SOCKET_ERROR)
	{
		printf("connect error !");
		closesocket(sclient);
		return 0;
	}

	char sendData[256];
	//const char * sendData = "你好，TCP服务端，我是客户端!
";
	scanf("%s",sendData);
	send(sclient, sendData, strlen(sendData), 0);

	char recData[255];
	int ret = recv(sclient, recData, 255, 0);
	if(ret > 0)
	{
		recData[ret] = 0x00;

		printf(recData);
	}

	closesocket(sclient);
	WSACleanup();

	return 0;
}

程序说明

编译：
gcc -fexec-charset=GBK prog.c -o prog -lws2_32
gcc -fexec-charset=GBK server.c -o server -lws2_32

-fexec-charset=GBK 防止中文乱码
-lws2_32 添加winsock的DLL

参考资料

1.winsock API
2.Windows/Linux C语言的Socket编程例子（TCP和UDP）