实现UDP协议，socket编程，调用到windowsAPI，实现客户端和服务器

来源：互联网发布：windows7优化内存编辑：程序博客网时间：2024/06/08 06:04

服务器部分：

利用socket

语言：C 语言

环境：可以编译的环境

代码如下：

#include <stdio.h>#include <stdlib.h>#include <winsock2.h>int main(){    WSADATA wsaData;    SOCKET RecvSocket;    struct sockaddr_in RecvAddr;    int port = 27015;    char RecvBuf[1024];    int BufLen = 1024;    int len =0;    int flag = 0;    FILE* fp;    struct sockaddr_in SenderAddr;    int SenderAddrSize = sizeof(SenderAddr);    //    WSAStartup(MAKEWORD(2, 2), &wsaData);    RecvSocket = socket(AF_INET, SOCK_DGRAM, IPPROTO_UDP);    RecvAddr.sin_family = AF_INET;    RecvAddr.sin_port = htons(port);    RecvAddr.sin_addr.s_addr = htonl(INADDR_ANY);    // 用于多方面数据的接受，符合服务器的数据传输的模式    if(bind(RecvSocket, (SOCKADDR* )&RecvAddr, sizeof(RecvAddr))< 0){        printf("Error: bind failed!\n");        exit(1);    }    printf("Receving datagrams ... \n");    for(; ; ){        static int count = 0;        static int fileNum = 0;        char filenameTmp[20];        len = recvfrom(RecvSocket, RecvBuf, BufLen, 0, (SOCKADDR* )&SenderAddr, &SenderAddrSize);        sendto(RecvSocket, RecvBuf, BufLen, 0, (SOCKADDR* )&SenderAddr, &SenderAddrSize);        //printf("Data Success, and sended!");        RecvBuf[len] = '\0';        //  此处的判断是为了文件接收的转换的情况， 注意加强自身的对UDP 协议的理解；        if(strcmp(RecvBuf, "file send -- 123")==0){            fileNum++;            sprintf(filenameTmp, "receive%d.txt", fileNum);            fp = fopen(filenameTmp, "a+");            printf("file will received\n");            flag = 1;        }else if(strcmp(RecvBuf, "file sended -- 123")==0){            printf("file have received!\n");            fclose(fp);            flag = 0;        }else{            if(flag == 1){                count++;                fprintf(fp ,"%s\t",RecvBuf);                if((count%5)== 0){                    fprintf(fp ,"\n");                }            }else{                printf("Received Data: %s\n", RecvBuf);            }        }    }    printf("Finished receiving. Closing socket. \n");    closesocket(RecvSocket); // 销毁套接字， 逻辑严密性    printf("Exiting.\n");    return 0;}

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