数据库：
client.c
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <string.h>
#include <sqlite3.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#define N 16
#define R 1 // user register
#define L 2 // user login
#define Q 3 // query word
#define H 4 // history record
#define COL 50
#define DATABASE "my.db"
typedef struct
{
int type;
char name[N];
char data[256]; // password or word or remark
} MSG;
void do_register(int socketfd, MSG *msg)
{
msg->type = R;
printf("input name : ");
scanf("%s", msg->name);
printf("input password : ");
scanf("%s", msg->data);
send(socketfd, msg, sizeof(MSG), 0);
recv(socketfd, msg, sizeof(MSG), 0);
printf("register : %s\n", msg->data);
return;
}
int do_login(int socketfd, MSG *msg)
{
msg->type = L;
printf("input name : ");
scanf("%s", msg->name);
printf("input password : ");
scanf("%s", msg->data);
send(socketfd, msg, sizeof(MSG), 0);
recv(socketfd, msg, sizeof(MSG), 0);
if (strncmp(msg->data, "OK", 3) == 0)
{
printf("login : OK\n");
return 1;
}
printf("login : %s\n", msg->data);
return 0;
}
void print(char *p)
{
int count = 0, len;
char *q;
printf(" ");
while ( *p )
{
if (*p == ' ' && count == 0) p++;
printf("%c", *p++);
count++;
/* if a new word will begin */
if (*(p-1) == ' ' && *p != ' ')
{
q = p;
len = 0;
/* count the length of next word */
while (*q != ' ' && *q != '\0')
{
len++;
q++;
}
if ((COL - count) < len)
{
printf("\n ");
count = 0;
}
}
if (count == 50)
{
count = 0;
printf("\n ");
}
}
return;
}
void do_query(int socketfd, MSG *msg)
{
msg->type = Q;
while ( 1 )
{
scanf("%s", msg->data);
if (strcmp(msg->data, "#") == 0) break;
send(socketfd, msg, sizeof(MSG), 0);
recv(socketfd, msg, sizeof(MSG), 0);
print(msg->data);
printf("\n");
}
return;
}
void do_history(int socketfd, MSG *msg)
{
msg->type = H;
send(socketfd, msg, sizeof(MSG), 0);
while ( 1 )
{
recv(socketfd, msg, sizeof(MSG), 0);
if (msg->data[0] == '\0') break;
printf("%s\n", msg->data);
}
return;
}
int main(int argc, char *argv[])
{
int socketfd ;
struct sockaddr_in server_addr;
MSG msg;
if (argc < 3)
{
printf("Usage : %s <serv_ip> <serv_port>\n", argv[0]);
exit(-1);
}
if ((socketfd = socket(PF_INET, SOCK_STREAM, 0)) < 0)
{
perror("fail to socket");
exit(-1);
}
bzero(&server_addr, sizeof(server_addr));
server_addr.sin_family = PF_INET;
server_addr.sin_addr.s_addr = inet_addr(argv[1]);
server_addr.sin_port = htons(atoi(argv[2]));
if (connect(socketfd, (struct sockaddr *)&server_addr, sizeof(server_addr)) < 0)
{
perror("fail to connect");
exit(-1);
}
int n;
while ( 1 )
{
printf("************************************\n");
printf("* 1: register 2: login 3: quit *\n");
printf("************************************\n");
printf("please choose : ");
if (scanf("%d", &n) <= 0)
{
perror("scanf");
exit(-1);
}
switch ( n )
{
case 1 :
printf("\n");
do_register(socketfd, &msg);
printf("\n");
break;
case 2 :
printf("\n");
if (do_login(socketfd, &msg) == 1)
{
printf("\n");
goto next;
}
printf("\n");
break;
case 3 :
close(socketfd);
exit(0);
}
}
next:
while ( 1 )
{
printf("***********************************************\n");
printf("* 1: query_word 2: history_record 3: quit *\n");
printf("***********************************************\n");
printf("please choose : ");
if (scanf("%d", &n) < 0)
{
perror("scanf");
exit(-1);
}
switch ( n )
{
case 1 :
printf("\n");
do_query(socketfd, &msg);
printf("\n");
break;
case 2 :
printf("\n");
do_history(socketfd, &msg);
printf("\n");
break;
case 3 :
close(socketfd);
exit(0);
}
}
return 0;
}#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <string.h>
#include <sqlite3.h>
#include <signal.h>
#include <time.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#define N 16
#define R 1 // user register
#define L 2 // user login
#define Q 3 // query word
#define H 4 // history record
#define DATABASE "my.db"
typedef struct
{
int type;
char name[N];
char data[256]; // password or word
} MSG;
void do_register(int connectfd, MSG *msg, sqlite3 *db)
{
char sqlstr[128];
char *errmsg;
sprintf(sqlstr, "insert into usr values ('%s', '%s')", msg->name, msg->data);
printf("%s\n", sqlstr);
if (sqlite3_exec(db, sqlstr, NULL, NULL, &errmsg) != SQLITE_OK)
{
sqlite3_free(errmsg);
sprintf(msg->data, "user %s already exist!!!", msg->name);
}
else
{
strncpy(msg->data, "OK", 256);
}
send(connectfd, msg, sizeof(MSG), 0);
return;
}
void do_login(int connectfd, MSG *msg, sqlite3 *db)
{
char sqlstr[128];
char *errmsg, **result;
int nrow, ncolumn;
sprintf(sqlstr, "select * from usr where name = '%s' and pass = '%s'", msg->name, msg->data);
if (sqlite3_get_table(db, sqlstr, &result, &nrow, &ncolumn, &errmsg) != SQLITE_OK)
{
printf("error : %s\n", errmsg);
sqlite3_free(errmsg);
}
if (nrow == 0)
{
strncpy(msg->data, "name or password is wrong!!!", 256);
}
else
{
strncpy(msg->data, "OK", 256);
}
send(connectfd, msg, sizeof(MSG), 0);
sqlite3_free_table(result);
return;
}
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);
return;
}
int do_searchword(int connectfd, MSG *msg)
{
FILE *fp;
char line[300];
char *p;
int len, result;
len = strlen(msg->data);
if ((fp = fopen("dict.txt", "r")) == NULL)
{
strcpy(msg->data, "dict on server can't be opened :(");
send(connectfd, msg, sizeof(MSG), 0);
}
printf("query word is %s\n", msg->data);
while (fgets(line, 300, fp) != NULL)
{
result = strncmp(msg->data, line, len);
if (result > 0) continue;
if (result < 0 || line[len] != ' ') break;
p = line + len;
while (*p == ' ') p++;
strcpy(msg->data, p);
fclose(fp);
return 1;
}
fclose(fp);
return 0;
}
void do_query(int connectfd, MSG *msg, sqlite3 *db)
{
char sqlstr[128], *errmsg;
int found = 0;
char date[64], word[64];
strcpy(word, msg->data);
found = do_searchword(connectfd, msg);
if ( found )
{
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);
}
}
else
{
strcpy(msg->data, "not found\n");
}
send(connectfd, msg, sizeof(MSG), 0);
return;
}
int history_callback(void *arg, int f_num, char **f_value, char **f_name)
{
int connectfd;
MSG msg;
connectfd = *(int *)arg;
sprintf(msg.data, "%s : %s", f_value[1], f_value[2]);
send(connectfd, &msg, sizeof(msg), 0);
return 0;
}
void do_history(int connectfd, MSG *pmsg, sqlite3 *db)
{
char sqlstr[128], *errmsg;
sprintf(sqlstr, "select * from record where name = '%s'", msg->name);
if (sqlite3_exec(db, sqlstr, history_callback, (void *)&connectfd, &errmsg) != SQLITE_OK)
{
printf("error : %s\n", errmsg);
sqlite3_free(errmsg);
}
msg->data[0] = '\0';
send(connectfd, msg, sizeof(MSG), 0);
return;
}
void do_client(int connectfd, sqlite3 *db)
{
MSG msg;
while (recv(connectfd, &msg, sizeof(msg), 0) > 0) // receive request
{
switch ( msg.type )
{
case R :
do_register(connectfd, &msg, db);
break;
case L :
do_login(connectfd, &msg, db);
break;
case Q :
do_query(connectfd, &msg, db);
break;
case H :
do_history(connectfd, &msg, db);
break;
}
}
printf("client quit\n");
exit(0);
return;
}
int main(int argc, char *argv[])
{
int listenfd, connectfd;
struct sockaddr_in server_addr;
pid_t pid;
sqlite3 *db;
if (argc < 3)
{
printf("Usage : %s <ip> <port>\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(&server_addr, sizeof(server_addr));
server_addr.sin_family = PF_INET;
server_addr.sin_addr.s_addr = inet_addr(argv[1]);
server_addr.sin_port = htons(atoi(argv[2]));
if (bind(listenfd, (struct sockaddr *)&server_addr, sizeof(server_addr)) < 0)
{
perror("fail to bind");
exit(-1);
}
if (listen(listenfd, 5) < 0)
{
perror("fail to listen");
exit(-1);
}
signal(SIGCHLD, SIG_IGN);// 为了不生成僵尸进程
while ( 1 )
{
if ((connectfd = accept(listenfd, NULL, NULL)) < 0)
{
perror("fail to accept");
exit(-1);
}
if ((pid = fork()) < 0)
{
perror("fail to fork");
exit(-1);
}
if (pid == 0)
{
do_client(connectfd, db);
}
close(connectfd);
}
return 0;
}还有一个是dict.txt的文件程序中用到，里面是单词和解释