Biegral Blog

        假设服务端的IP为w.x.y.z, 下面来写一个简单的聊天程序：

       服务端为;

#include <stdio.h>
#include <winsock2.h>
#pragma comment(lib, "ws2_32.lib") 

int main()
{
	WORD wVersionRequested;
	WSADATA wsaData;
	
	wVersionRequested = MAKEWORD(1, 1);
	
	WSAStartup( wVersionRequested, &wsaData );
	
	SOCKET sockSrv=socket(AF_INET, SOCK_DGRAM, 0);

	SOCKADDR_IN addrSrv;
	addrSrv.sin_addr.S_un.S_addr = inet_addr("w.x.y.z"); // 请将w.x.y.z改为实际IP
	addrSrv.sin_family = AF_INET;
	addrSrv.sin_port = htons(8888);

	bind(sockSrv, (SOCKADDR*)&addrSrv, sizeof(SOCKADDR));

	char recvBuf[100];
	char sendBuf[100];
	char tempBuf[100];

	SOCKADDR_IN addrClient;
	int len = sizeof(SOCKADDR);

	while(1)
	{
		recvfrom(sockSrv, recvBuf, 100, 0, (SOCKADDR*)&addrClient, &len);
		sprintf(tempBuf,"%s", recvBuf);
		printf("%s\n", tempBuf);

		printf("Please input data:\n");
		gets(sendBuf);
		sendto(sockSrv, sendBuf, strlen(sendBuf) + 1, 0, (SOCKADDR*)&addrClient, len);
	}

	closesocket(sockSrv);
	WSACleanup();

	return 0;
}

       客户端为：

#include <stdio.h>
#include <winsock2.h>
#pragma comment(lib, "ws2_32.lib") 

int main()
{
	WORD wVersionRequested;
	WSADATA wsaData;
	
	wVersionRequested = MAKEWORD(1, 1);
	
	WSAStartup(wVersionRequested, &wsaData);

	SOCKET sockClient = socket(AF_INET, SOCK_DGRAM, 0);

	SOCKADDR_IN addrSrv;
	addrSrv.sin_addr.S_un.S_addr = inet_addr("w.x.y.z"); // 请将w.x.y.z改为实际IP
	addrSrv.sin_family = AF_INET;
	addrSrv.sin_port = htons(8888);

	char recvBuf[100];
	char sendBuf[100];
	char tempBuf[100];

	int len=sizeof(SOCKADDR);

	while(1)
	{
		printf("Please input data:\n");
		gets(sendBuf);
		sendto(sockClient, sendBuf, strlen(sendBuf) + 1, 0, (SOCKADDR*)&addrSrv, len);

		recvfrom(sockClient,recvBuf, 100, 0, (SOCKADDR*)&addrSrv, &len);
		sprintf(tempBuf,"%s", recvBuf);
		printf("%s\n", tempBuf);
	}

	closesocket(sockClient);
	WSACleanup();

	return 0;
}

       先启动服务端，再启动客户端，运行程序，可以相互聊天。