基于TCP的在线词典

此程序主要是利用tcp传输和sqlite3进行操作的。
程序执行过程部分截图

#在终端输入sqlite3，查看是否安装sqlite3，没有的话先安装sqlite3
sudo apt-get install sqlite3
sudo apt-get install libsqlite3-dev

打开数据库 sqlite3 my.db
然后在里面创建数据库
create table <table_name> (f1 type1, f2 type2,…);

需要在编译选项上加入-lsqlite3

server.c

#include <stdlib.h>
#include <string.h>
#include <sys/types.h>          /* See NOTES */
#include <sys/socket.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <signal.h>
#include <sqlite3.h>
#include <time.h>#define  N  256 typedef struct _msg
{char types;char name[N] ;char text[N] ;
}msg_t;int login_callback(void*data,int num,char**value,char**name)
{//   int i;*(int * )data = 1 ;
#if 0if(*flag){*flag = 0 ; for(i=0;i<num;i++){printf("%-10s",name[i]);}printf("\n");}for(i=0;i<num;i++){printf("%-10s",value[i]);}printf("\n");#endifreturn 0;}
int process_register(int newsockfd,msg_t *msgp,sqlite3 *db)
{int ret;char *errmsg ;char sqlstr[N] = {0};sprintf(sqlstr,"insert into user values('%s','%s');",msgp->name,msgp->text);printf("sqlstr=%s\n",sqlstr) ;ret = sqlite3_exec(db,sqlstr,NULL,NULL,&errmsg);if(ret != SQLITE_OK){printf("sqlite3_exec:%s\n",errmsg);strcpy(msgp->text,"用户名已经存在，请重新输入");}else {strcpy(msgp->text,"注册成功");}ret = write(newsockfd,msgp,sizeof(msg_t));if(ret < 0){perror("write"); exit(-1);}return 0;
}
int process_login(int newsockfd,msg_t *msgp,sqlite3 *db)
{int ret;char *errmsg ;char sqlstr[N] = {0};int  login_flag = 0 ; sprintf(sqlstr,"select * from user where name='%s' and passwd='%s';",msgp->name,msgp->text);printf("sqlstr=%s\n",sqlstr) ;ret = sqlite3_exec(db,sqlstr,login_callback,&login_flag,&errmsg);if(ret != SQLITE_OK){printf("sqlite3_exec:%s\n",errmsg);}if(login_flag == 1){strcpy(msgp->text,"登录成功");}else {strcpy(msgp->text,"用户或密码错误，请重新输入");}ret = write(newsockfd,msgp,sizeof(msg_t));if(ret < 0){perror("write"); exit(-1);}return 0;
}
char * search_word(char *word)
{FILE * filp;static char line[N] ={0};char newword[100] ;strcpy(newword,word);strcat(newword," ");filp = fopen("./dict.txt","r");if(filp == NULL){perror("fopen") ; exit(-1);}while( fgets(line,N,filp) != NULL ) {if( strncmp(newword,line,strlen(newword)) == 0 )  {printf("%s",line) ;return line ;}}return NULL;
}char * get_localtime()
{static char buf[100] ={0} ;time_t tm;time(&tm);strcpy(buf,ctime(&tm));buf[strlen(buf) -1] = 0 ;return buf;
}int process_query(int newsockfd,msg_t *msgp,sqlite3 *db)
{int ret;char *retp;char *errmsg ;char sqlstr[N] = {0};int  login_flag = 0 ; char word[100] = {0} ;strcpy(word,msgp->text);retp = search_word(word);if(retp == NULL){strcpy(msgp->text,"要查找的单词不存在");ret = write(newsockfd,msgp,sizeof(msg_t));if(ret < 0){perror("write"); exit(-1);}}else {strcpy(msgp->text,retp);sprintf(sqlstr,"insert into record values('%s','%s','%s');",msgp->name,word,get_localtime());printf("sqlstr=%s\n",sqlstr) ;ret = sqlite3_exec(db,sqlstr,NULL,NULL,&errmsg);if(ret != SQLITE_OK){printf("sqlite3_exec:%s\n",errmsg);}ret = write(newsockfd,msgp,sizeof(msg_t));if(ret < 0){perror("write"); exit(-1);}}return 0;
}
int history_callback(void*data,int num,char**value,char**name)
{int i,ret;msg_t msg;char buf[256] ={0};int newsockfd = *(int * )data  ;memset(&msg,0,sizeof(msg_t));msg.types = 'H' ;for(i=0;i<num;i++){sprintf(buf,"%-10s",value[i]);strcat(msg.text,buf);}ret = write(newsockfd,&msg,sizeof(msg_t));if(ret < 0){perror("write"); exit(-1);}return 0;}
int process_history(int newsockfd,msg_t *msgp,sqlite3 *db)
{int ret;char *retp;char *errmsg ;char sqlstr[N] = {0};int  login_flag = 0 ; sprintf(sqlstr,"select * from record where name='%s';",msgp->name);printf("sqlstr=%s\n",sqlstr) ;ret = sqlite3_exec(db,sqlstr,history_callback,&newsockfd,&errmsg);if(ret != SQLITE_OK){printf("sqlite3_exec:%s\n",errmsg);}strcpy(msgp->text,"传输完成");ret = write(newsockfd,msgp,sizeof(msg_t));if(ret < 0){perror("write"); exit(-1);}return 0;
}
// ./a.out 192.168.1.57 8000
// argv[0] argv[1]       aegv[2]
int main(int argc, const char *argv[])
{sqlite3 *db  ;        /* OUT: SQLite db handle */int data = 1 ;int sockfd,ret,newsockfd;struct sockaddr_in myaddr,client;signal(SIGCHLD,SIG_IGN);msg_t msg;if(argc != 3){printf("运行程序时带入ip 和 port\n");exit(-1);}socklen_t addrlen = sizeof(client);sockfd = socket(AF_INET,SOCK_STREAM,0);if(sockfd < 0){perror("socket");exit(-1);}printf("sockfd=%d\n",sockfd);memset(&myaddr,0,sizeof(myaddr));myaddr.sin_family = AF_INET ;myaddr.sin_port   = htons(atoi(argv[2]));myaddr.sin_addr.s_addr   = inet_addr(argv[1]); ret = bind(sockfd,(struct sockaddr *)&myaddr,sizeof(myaddr)) ; // 给socket 一个固定的ip 和端口 if(ret < 0){perror("bind");exit(-1);}ret = listen(sockfd,10);if(ret < 0){perror("listen");exit(-1);}if(sqlite3_open("my.db",&db) != SQLITE_OK){printf("%s\n",sqlite3_errmsg(db));exit(-1);}while(1){newsockfd = accept(sockfd,(struct sockaddr *)&client,&addrlen) ; if(newsockfd < 0){printf("accept");exit(-1);}printf("newsockfd = %d\n",newsockfd);printf("%s and %d\n",inet_ntoa(client.sin_addr),ntohs(client.sin_port));if( fork() == 0){while(1){ret = read(newsockfd,&msg,sizeof(msg_t));if(ret  < 0){printf("read");exit(-1);}else if(ret == 0){break ; }printf("msg.type=%c\n",msg.types);switch(msg.types){case 'R':process_register(newsockfd,&msg,db);break ; case 'L':process_login(newsockfd,&msg,db);break ; case 'Q':process_query(newsockfd,&msg,db);break ; case 'H':process_history(newsockfd,&msg,db);break ; default:break ;}}close(newsockfd);exit(0);}close(newsockfd);}return 0;
}

client.c

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/types.h>          /* See NOTES */
#include <sys/socket.h>
#include <netinet/in.h>
#include <arpa/inet.h>#define  N   256
typedef struct _msg
{char types;char name[N] ;char text[N] ;
}msg_t;int process_register(int sockfd,msg_t *msgp)
{int ret;msgp->types = 'R';printf("input your name:");fgets(msgp->name,N,stdin);msgp->name[strlen(msgp->name) -1 ] = 0 ;printf("input your passwd:");fgets(msgp->text,N,stdin);msgp->text[strlen(msgp->text) -1 ] = 0 ;ret = write(sockfd,msgp,sizeof(msg_t));if(ret < 0){perror("write"); exit(-1);}memset(msgp,0,sizeof(msg_t)) ;ret = read(sockfd,msgp,sizeof(msg_t));if(ret < 0){perror("write"); exit(-1);}printf("%s\n",msgp->text);return 0;
}
int process_query(int sockfd,msg_t *msgp)
{int ret;msgp->types = 'Q';while(1){printf("input your word:");fgets(msgp->text,N,stdin);msgp->text[strlen(msgp->text) -1 ] = 0 ;if(strncmp(msgp->text,"#",1) == 0 ) break ;ret = write(sockfd,msgp,sizeof(msg_t));if(ret < 0){perror("write"); exit(-1);}memset(msgp,0,sizeof(msg_t)) ;ret = read(sockfd,msgp,sizeof(msg_t));if(ret < 0){perror("write"); exit(-1);}printf("%s\n",msgp->text);}return 0;
}
int process_history(int sockfd,msg_t *msgp)
{int ret;msgp->types = 'H';ret = write(sockfd,msgp,sizeof(msg_t));if(ret < 0){perror("write"); exit(-1);}memset(msgp,0,sizeof(msg_t)) ;while(1) {ret = read(sockfd,msgp,sizeof(msg_t));if(ret < 0){perror("write"); exit(-1);}if(strncmp(msgp->text,"传输完成",sizeof("传输完成")) == 0)  break ; printf("%s\n",msgp->text);}return 0;
}
int process_login(int sockfd,msg_t *msgp)
{int ret,num;msgp->types = 'L';printf("input your name:");fgets(msgp->name,N,stdin);msgp->name[strlen(msgp->name) -1 ] = 0 ;printf("input your passwd:");fgets(msgp->text,N,stdin);msgp->text[strlen(msgp->text) -1 ] = 0 ;ret = write(sockfd,msgp,sizeof(msg_t));if(ret < 0){perror("write"); exit(-1);}memset(msgp,0,sizeof(msg_t)) ;ret = read(sockfd,msgp,sizeof(msg_t));if(ret < 0){perror("write"); exit(-1);}printf("%s\n",msgp->text);if(strncmp(msgp->text,"登录成功",sizeof("登陆成功")) == 0 ){while(1){printf("*************************************************\n");printf("*1:search word   2: history   3: quit************\n");printf("*************************************************\n");printf("please input your choice >:");scanf("%d",&num);scanf("%*[^\n]");scanf("%*c"); //回收残留在标准输入的字符 switch(num){case 1:process_query(sockfd,msgp); break ; case 2:process_history(sockfd,msgp); break ; case 3:close(sockfd); exit(0);default:break ;}}}return 0;
}// ./a.out 192.168.1.57 8000
int main(int argc, const char *argv[])
{char buf[N] = {0};int sockfd,ret,newsockfd;int num;struct sockaddr_in server,client;msg_t msg;if(argc != 3){printf("运行程序时带入ip 和 port\n");exit(-1);}socklen_t addrlen = sizeof(client);sockfd = socket(AF_INET,SOCK_STREAM,0);if(sockfd < 0){perror("socket");exit(-1);}printf("sockfd=%d\n",sockfd);memset(&msg,0,sizeof(msg));memset(&server,0,sizeof(server));server.sin_family = AF_INET ;server.sin_port   = htons( atoi(argv[2]) );server.sin_addr.s_addr   = inet_addr(argv[1]); ret = connect(sockfd,(struct sockaddr *)&server,sizeof(server)) ;if(ret < 0){perror("connect");exit(-1);}while(1){printf("*************************************************\n");printf("*1:register   2: login    3: quit****************\n");printf("*************************************************\n");printf("please input your choice >:");scanf("%d",&num);scanf("%*[^\n]");scanf("%*c"); //回收残留在标准输入的字符 switch(num){case 1:process_register(sockfd,&msg); break ; case 2:process_login(sockfd,&msg); break ; case 3:close(sockfd); exit(0);default:break ;}}printf(">:");fgets(buf,N,stdin);ret  = write(sockfd,buf,N) ;if(ret < 0){perror("write");exit(-1);}ret = read(sockfd,buf,N);if(ret  < 0){printf("read");exit(-1);}printf("%s\n",buf);close(sockfd);return 0;
}

运行时gcc server.c -o server -lsqlite3
./server 本机ip 端口号
gcc client.c -o client -lsqlite3
./client 本机ip 端口号
此外还需要个词典的文件。自行解决。

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