Linux C实现的在线词典(基于TCP)
基本功能
- 注册
- 登录
- 查询
- 查看查询记录
源码
#include 服务器端:
#include"head_server.h"
void do_register(int connfd, MSG *pbuf, sqlite3 *db)
{
char sqlstr[128];
char *errmsg;
sprintf(sqlstr, "insert into usr values ('%s', '%s')", pbuf->name, pbuf->data);
printf("%s\n", sqlstr);
if (sqlite3_exec(db, sqlstr, NULL, NULL, &errmsg) != SQLITE_OK)
{
sqlite3_free(errmsg);
sprintf(pbuf->data, "user %s already exist!!!", pbuf->name);
}
else
{
strncpy(pbuf->data, "OK", 256);
}
send(connfd, pbuf, sizeof(MSG), 0);
return;
}
void do_login(int connfd,MSG *msg,sqlite3 *db)
{
char sqlopt[128];
char *errmsg,**result;
int r, c;
sprintf(sqlopt, "select * from usr where name = '%s' and pass = '%s'", msg -> name, msg -> data);
if (sqlite3_get_table(db, sqlopt, &result, &r, &c, &errmsg) != SQLITE_OK)
{
printf("error:%s\n",errmsg);
}
if(r == 0)
{
msg -> type = F;
}
else
{
msg -> type = S;
}
send(connfd, msg, sizeof(MSG), 0);
}
int do_search(int connfd, MSG *msg)
{
FILE *fp;
char str[300];
int result,len;
char *p;
if((fp = fopen("dict.txt", "r")) == NULL)
{
strcpy(msg -> data, "File can't be opened!!!");
send(connfd, msg, sizeof(MSG), 0);
return -1;
}
len = strlen(msg -> data);
printf("%s\n", msg -> data);
while(fgets(str,300,fp) != NULL)
{
result = strncmp(msg -> data,str,len);
if(result > 0)
{
continue;
}
if(result < 0 || str[len] != ' ')
{
break;
}
p = str + len;
while(*p == ' ')
p ++;
strcpy(msg -> data, p);
printf("%s\n",msg -> data);
send(connfd, msg, sizeof(MSG), 0);
fclose(fp);
return 1;
}
strcpy(msg -> data, "Word can't be found!!!");
send(connfd, msg, sizeof(MSG), 0);
fclose(fp);
return 0;
}
void get_date(char date[])
{
time_t t;
struct tm *tp;
time(&t);
tp = localtime(&t);
strftime(date, 64, "%Y-%m-%d %H:%M:%S", tp);
}
int do_query(int connfd,MSG *msg,sqlite3 *db)
{
char date[64];
char word[64];
char sqlstr[100];
char *errmsg;
strcpy(word,msg -> data);
if(do_search(connfd, msg) != 1)
return -1;
get_date(date);
sprintf(sqlstr, "insert into record values ('%s', '%s', '%s')", msg->name,date, word);
if (sqlite3_exec(db, sqlstr, NULL, NULL, &errmsg) != SQLITE_OK)
{
printf("error : %s\n", errmsg);
sqlite3_free(errmsg);
}
}
int history_callback(void *arg, int f_num, char **f_value, char **f_name)
{
//f_value 每个记录的值
//f_num 记录中包含的字段个数
//f_name 每个记录的字段名称
int connfd;
MSG buf;
connfd = *(int *)arg;
sprintf(buf.data, "%s : %s", f_value[1], f_value[2]);
send(connfd, &buf, sizeof(buf), 0);
return 0;
}
void do_history(int connfd, MSG *msg, sqlite3 *db)
{
char sqlstr[128], *errmsg;
sprintf(sqlstr, "select * from record where name = '%s'", msg->name);
if (sqlite3_exec(db, sqlstr, history_callback, (void *)&connfd, &errmsg) != SQLITE_OK)
{
printf("error : %s\n", errmsg);
}
msg->data[0] = '\0';
send(connfd, msg, sizeof(MSG), 0);
}
void do_menu(int connfd, sqlite3 *db)
{
MSG msg;
while( recv(connfd, &msg, sizeof(msg), 0) > 0)
{
switch(msg.type)
{
case R:
do_register(connfd,&msg,db);
break;
case L:
do_login(connfd,&msg,db);
break;
case Q:
do_query(connfd,&msg,db);
break;
case H:
do_history(connfd, &msg, db);
break;
}
}
printf("client quit\n");
exit(0);
}
int main(int argc, char *argv[])
{
int listenfd, connfd;
struct sockaddr_in myaddr;
pid_t pid;
MSG buf;
sqlite3 *db;
if (argc < 3)
{
printf("Usage : %s \n" , argv[0]);
exit(-1);
}
if (sqlite3_open(DATABASE, &db) != SQLITE_OK)
{
printf("error : %s\n", sqlite3_errmsg(db));
exit(-1);
}
if ((listenfd = socket(PF_INET, SOCK_STREAM, 0)) < 0)
{
perror("fail to socket");
exit(-1);
}
bzero(&myaddr, sizeof(myaddr));
myaddr.sin_family = PF_INET;
myaddr.sin_port = htons(atoi(argv[2]));
myaddr.sin_addr.s_addr = inet_addr(argv[1]);
if (bind(listenfd, (SA *)&myaddr, sizeof(myaddr)) < 0)
{
perror("fail to bind");
exit(-1);
}
if (listen(listenfd, 5) < 0)
{
perror("fail to listen");
exit(-1);
}
signal(SIGCHLD, SIG_IGN);
while ( 1 )
{
if ((connfd = accept(listenfd, NULL, NULL)) < 0)
{
perror("fail to accept");
exit(-1);
}
if ((pid = fork()) < 0)
{
perror("fail to fork");
exit(-1);
}
else if (pid == 0)
{
do_menu(connfd,db);
}
close(connfd);
}
return 0;
}
客户端:
#include"head_client.h"
void do_register(int sockfd, MSG *msg)
{
msg->type = R;
printf("Please input name : ");
scanf("%s", msg->name);
printf("Please input password : ");
scanf("%s", msg->data);
send(sockfd, msg, sizeof(MSG), 0);
recv(sockfd, msg, sizeof(MSG), 0);
printf("Register : %s\n", msg->data);
}
/**************************************************************/
int do_login(int sockfd,MSG *msg)
{
memset(msg,0,sizeof(msg));
msg -> type = L;
printf("Please input name : ");
scanf("%s", msg->name);
printf("Please input password : ");
scanf("%s", msg->data);
send(sockfd, msg, sizeof(MSG), 0);
recv(sockfd, msg, sizeof(MSG), 0);
if(msg -> type == F)
{
printf("LOGIN:name or password is wrong!!!\n");
return 0;
}
else
{
printf("LOGIN: OK\n");
return 1;
}
}
/******************************************************************/
int do_query(int sockfd,MSG *msg)
{
msg -> type = Q;
while(1)
{
printf("Please inputs words : ");
scanf("%s", msg->data);
if(strncmp(msg -> data, "#", 2) == 0)
break;
send(sockfd, msg, sizeof(MSG), 0);
recv(sockfd, msg, sizeof(MSG), 0);
printf("Explain: %s\n", msg->data);
}
}
/****************************************************************/
void do_history(int sockfd, MSG *msg)
{
msg->type = H;
send(sockfd, msg, sizeof(MSG), 0);
while (1)
{
recv(sockfd, msg, sizeof(MSG), 0);
if (msg->data[0] == '\0') break;
printf("%s\n", msg->data);
}
}
int main(int argc, char *argv[])
{
int sockfd, login = 0;
struct sockaddr_in servaddr;
MSG msg;
char clean[64];
if (argc < 3)
{
printf("INPUT ERROR\n", argv[0]);
exit(-1);
}
if ((sockfd = socket(PF_INET, SOCK_STREAM, 0)) < 0)
{
perror("Fail to socket");
exit(-1);
}
bzero(&servaddr, sizeof(servaddr));
servaddr.sin_family = PF_INET;
servaddr.sin_port = htons(atoi(argv[2]));
servaddr.sin_addr.s_addr = inet_addr(argv[1]);
if (connect(sockfd, (SA *)&servaddr, sizeof(servaddr)) < 0)
{
perror("Fail to connect");
exit(-1);
}
int n;
front:
while ( 1 )
{
printf("\n");
printf("************************************\n");
printf("* 1: Register 2: Login 3: Quit *\n");
printf("************************************\n");
printf("\n");
printf("Please choose : ");
if (scanf("%d", &n) == 0)
{
fgets(clean, 64, stdin);
printf("\n");
continue;
}
switch ( n )
{
case 1 :
printf("\n");
do_register(sockfd, &msg);
printf("\n");
break;
case 2 :
printf("\n");
if (do_login(sockfd, &msg) == 1)
{
printf("\n");
goto next;
}
printf("\n");
break;
case 3 :
close(sockfd);
exit(0);
}
}
//the second menu
next:
while (1)
{
printf("****************************************************\n");
printf("* 1: Query word 2: History word 3: Main menu *\n");
printf("****************************************************\n");
printf("please choose : ");
if (scanf("%d", &n) == 0)
{
fgets(clean, 64, stdin);
printf("\n");
continue;
}
switch ( n )
{
case 1 :
printf("\n");
do_query(sockfd, &msg);
printf("\n");
break;
case 2 :
printf("\n");
do_history(sockfd, &msg);
printf("\n");
break;
case 3 :
goto front;
}
}
return 0;
}