基于udp协议的字符串计数【网络程序设计 - 基于udp协议的字符串计数，C实现】

udp_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[])
{
    WSADATA wsaData;
    WORD sockVersion = MAKEWORD(2,2);
    if(WSAStartup(sockVersion, &wsaData) != 0)
    {
        return 0;
    }
 
    SOCKET serSocket = socket(AF_INET, SOCK_DGRAM, IPPROTO_UDP); 
    if(serSocket == INVALID_SOCKET)
    {
        printf("socket error !");
        return 0;
    }
 
    sockaddr_in serAddr;
    serAddr.sin_family = AF_INET;
    serAddr.sin_port = htons(8888);
    serAddr.sin_addr.S_un.S_addr = INADDR_ANY;
    if(bind(serSocket, (sockaddr *)&serAddr, sizeof(serAddr)) == SOCKET_ERROR)
    {
        printf("bind error !");
        closesocket(serSocket);
        return 0;
    }
    
    sockaddr_in remoteAddr;
    int nAddrLen = sizeof(remoteAddr); 
    while (1)
    {
        char recvData[255];  
        int ret = recvfrom(serSocket, recvData, 255, 0, (sockaddr *)&remoteAddr, &nAddrLen);
        //puts(recvData); 
        if (ret > 0)
        {
            recvData[ret] = 0x00;           
            printf("接受到一个连接：%s \r\n", inet_ntoa(remoteAddr.sin_addr));
            printf(recvData);
            puts("");           
        }
        int temp=strlen(recvData);
        char sendData[255];
        sprintf(sendData,"%d",temp);
        //char * sendData = "一个来自服务端的UDP数据包\n";
        sendto(serSocket, sendData, strlen(sendData), 0, (sockaddr *)&remoteAddr, nAddrLen);    
 
    }
    closesocket(serSocket); 
    WSACleanup();
    return 0;
}

udp_client.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[])
{
    WORD socketVersion = MAKEWORD(2,2);
    WSADATA wsaData;
    if(WSAStartup(socketVersion, &wsaData) != 0)
    {
        return 0;
    }
    SOCKET sclient = socket(AF_INET, SOCK_DGRAM, IPPROTO_UDP);

    sockaddr_in sin;
    sin.sin_family = AF_INET;
    sin.sin_port = htons(8888);
    sin.sin_addr.S_un.S_addr = inet_addr("127.0.0.1");
    int len = sizeof(sin);

    char sendData[256];
    while(1)
    {       
         gets(sendData);
         //"来自客户端的数据包.\n";
         if(strcmp(sendData,"quit")==0)
             break;
        sendto(sclient, sendData, strlen(sendData), 0, (sockaddr *)&sin, len);

        char recvData[255];
        int ret = recvfrom(sclient, recvData, 255, 0, (sockaddr *)&sin, &len);
        if(ret > 0)
        {
            recvData[ret] = 0x00;
            printf(recvData);
            puts("");
        }

    }


    closesocket(sclient);
    WSACleanup();
    return 0;
}