C语言聊天室代码服务端.docVIP

C语言聊天室代码(服务端) /* server.c */ #include lt;stdio.hgt; #include lt;stdlib.hgt; #include lt;string.hgt; #includelt;Winsock2.hgt; #includelt;process.hgt; #pragma comment(lib,quot;ws2_32.libquot;) #includelt;windows.hgt; #define REG 1 //表示注册 #define LOGIN 2 //表示登陆 #define TALK_PRIVATE 3 //表示私聊 #define TALK_PUBLIC 4 //表示群聊 #define LIST 11 //表示显示所有在线不隐身用户 #define EXIT 12 //退出客户端 struct user { char username[50]; char password[50]; int cmd; char target_user[20]; char content[50]; }; struct user user; char *file_name(char *p,struct user user) //生成登陆名.txt文件函数 { int i = 0; int username_len; username_len = strlen(user.username); strcpy(p,user.username); strcat(p,quot;.txtquot;); return p; } void resign(SOCKET sockfd,struct user user) //注册函数 { int username_len; char buf[50]; char buf_fp[50]; FILE *fp; if((fp=fopen(quot;resign.txtquot;,quot;a+quot;))==NULL) { perror(quot;open resign.txt failed !\nquot;); exit(1); } username_len = strlen(user.username); while(1) { if ((fgets(buf_fp,sizeof(buf_fp),fp)) == NULL) { send(sockfd,quot;rightquot;,5,0); strcpy(buf,user.username); buf[strlen(buf)]=#39;\0#39;; int i = fprintf(fp,quot;%squot;,buf); memset(buf,0,sizeof(buf)); strcpy(buf,user.password); printf(quot;%squot;,buf); i=fprintf(fp,quot;:%s\nquot;,buf); memset(buf,0,sizeof(buf)); fclose(fp); break; } if (strncmp(user.username,buf_fp,strlen(user.username)) == 0) { send(sockfd,quot;wrongquot;,5,0); break; } } } void login(SOCKET sockfd,struct user user) //登陆函数 { char buf_fp[100]; char buf[100]; int username_len = strlen(user.username); strcpy(buf,user.username); buf[username_len] = #39;:#39;; buf[username_len+1] = #39;\0#39;; char *p=strcat(buf,user.password); p[strlen(p)]=#39;\0#39;; FILE *fp; if((fp=fopen(quot;resign.txtquot;,quot;r+quot;))==NULL) {