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小钱努力学C

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项目——电子词典（客户端、服务器交互，字典导入，单词查询）

一、项目要求

  1. 登录注册功能，不能重复登录，重复注册
  2. 单词查询功能
  3. 历史记录功能，存储单词，意思，以及查询时间
  4. 基于TCP，支持多客户端连接
  5. 采用数据库保存用户信息与历史记录
  6. 将dict.txt的数据导入到数据库中保存。
  7. 按下ctrl+c退出客户端后，注销该客户端的登录信息

二、主要实现功能 

  1. 注册
  2. 登录
  3. 查询单词
  4. 查询历史记录
  5. 退出登录

三、框架设计

3.1 服务器 

项目——电子词典（客户端、服务器交互，字典导入，单词查询）-LMLPHP

3.2 客户端

项目——电子词典（客户端、服务器交互，字典导入，单词查询）-LMLPHP 

 四、功能实现

4.1 服务器实现功能代码

4.1.1 导入词典

主要流程：

  1. 创建并打开数据库
  2. 创建数据表
  3. 打开词典所在目录文件
  4. 逐行读取并插入到数据表中
  5. 关闭文件描述符，关闭数据库
//导入词典
int import_dict(sqlite3 *db)
{
	if(sqlite3_open("./dict.db",&db) != SQLITE_OK)
	{
		fprintf(stderr,"sqlite3_open: %s __%d__\n",sqlite3_errmsg(db),__LINE__);
		return -1;
	}

	//创建一个表
	char sql[128] = "create table if not exists dict (word char,mean char);";
	char *errmsg = NULL;

	if(sqlite3_exec(db,sql,NULL,NULL,&errmsg) != SQLITE_OK)
	{
		fprintf(stderr,"sqlite3_exec: %s __%d__\n",errmsg,__LINE__);
		return -1;
	}

	//打开文件
	FILE* fp = fopen("./dict.txt", "r");
	if(NULL == fp)
	{
		perror("fopen");
		return -1;
	}

	//循环读取文件中的数据，一行一行的读取
	char buf[256] = "";
	char word[32] = "";
	char mean[200] = "";
	int count = 1;
	int i = 0;
	char* ptr = NULL;

	printf("importing dictionary...\n");
	while(1)
	{
		if(fgets(buf, sizeof(buf), fp) == NULL)
			break;
		buf[strlen(buf)-1] = 0;

		//分离单词和意思
		bzero(word, sizeof(word));
		bzero(mean, sizeof(mean));

		//获取"  "子串在buf中的地址
		ptr = strstr(buf, "  ");
		if(NULL == ptr)
		{
			printf("没有找到对应子串\n");
			break;
		}
		strncpy(word, buf, ptr-buf);    //"  "子串前面是单词
		strcpy(mean, ptr+3);        //"  "子串后面是意思                               

		//插入到数据库中
		sprintf(sql,"insert into dict values (\"%s\", \"%s\");", word, mean);
		if(sqlite3_exec(db, sql, NULL, NULL, &errmsg) != SQLITE_OK)
		{
			printf("sqlite3_exec failed:%s __%d__\n", errmsg, __LINE__);
			return -1;
		}
	}

	//关闭文件
	fclose(fp);

	//关闭数据库，释放对应的内存空间
	if(sqlite3_close(db) != SQLITE_OK)
	{
		printf("sqlite3_close failed:%s __%d__\n", sqlite3_errmsg(db), __LINE__);
		return -1;
	}
	printf("dictionary import completed...\n");
	return 0;
}

4.1.2 注册

主要流程：

  1. 创建并打开数据库
  2. 创建数据表
  3. 匹配来自客户端的用户名，若存在，则回复用户名已存在；若不存在，则将用户名与密码插入数据表中
  4. 关闭数据库
//匹配用户名是否存在
int do_select_user(sqlite3 *db,char *name)
{
	char sql[128] = "select name from user;";
	char **pres = NULL;
	int row,column;
	char *errmsg = NULL;
	if(sqlite3_get_table(db,sql,&pres,&row,&column,&errmsg) != SQLITE_OK)
	{
		fprintf(stderr,"sqlite3_exec: %s __%d__\n",errmsg,__LINE__);
		return -1;
	}

	for(int i=1;i<(row+1)*column;i++)
	{
		if(strcmp(pres[i],name) == 0)
		{
			fprintf(stderr,"sqlite3_exec: name already existss\n");
			return 1;
		}
	}
	return 0;
}
//实现注册功能
int Register(sqlite3 *db,char *buf)
{
	//打开数据库
	if(sqlite3_open("./dict.db",&db) != SQLITE_OK)
	{
		fprintf(stderr,"sqlite3_open: %s __%d__\n",sqlite3_errmsg(db),__LINE__);
		return -1;
	}

	//创建一个表
	char sql[128] = "create table if not exists user (name char,passwd char);";
	char *errmsg = NULL;

	if(sqlite3_exec(db,sql,NULL,NULL,&errmsg) != SQLITE_OK)
	{
		fprintf(stderr,"sqlite3_exec: %s __%d__\n",errmsg,__LINE__);
		return -1;
	}

	char *name = buf+2;
	char *passwd = buf+2+strlen(buf+2)+1;

	if(do_select_user(db,name) == 1)
	{
		return 1;
	}
	sprintf(sql,"insert into user values ('%s','%s');",name,passwd);
	if(sqlite3_exec(db,sql,NULL,NULL,&errmsg) != SQLITE_OK)
	{
		fprintf(stderr,"sqlite3_exec: %s __%d__\n",errmsg,__LINE__);
		return -1;
	}
	printf("register success...\n");

	//关闭数据库，释放对应的内存空间
	if(sqlite3_close(db) != SQLITE_OK)
	{
		printf("sqlite3_close failed:%s __%d__\n", sqlite3_errmsg(db), __LINE__);
		return -1;
	}
	return 0;
}

4.1.3 登录

主要流程：

  1. 创建并打开数据库
  2. 创建数据表
  3. 匹配来自客户端的用户名和密码，若用户名和密码与数据库中的数据相匹配，则登录成功，否则登录失败
  4. 关闭数据库
//实现登录功能
int Login(sqlite3 *db,char *buf)
{
	//打开数据库
	if(sqlite3_open("./dict.db",&db) != SQLITE_OK)
	{
		fprintf(stderr,"sqlite3_open: %s __%d__\n",sqlite3_errmsg(db),__LINE__);
		return -1;
	}

	char sql[128] = "create table if not exists user (name char,passwd char);";
	char *errmsg = NULL;

	if(sqlite3_exec(db,sql,NULL,NULL,&errmsg) != SQLITE_OK)
	{
		fprintf(stderr,"sqlite3_exec: %s __%d__\n",errmsg,__LINE__);
		return -1;
	}

	strcpy(sql,"select * from user;");
	char **pres = NULL;
	int row,column;
	if(sqlite3_get_table(db,sql,&pres,&row,&column,&errmsg) != SQLITE_OK)
	{
		fprintf(stderr,"sqlite3_exec: %s __%d__\n",errmsg,__LINE__);
		return -1;
	}

	char *name = buf+2;
	char *passwd = buf+2+strlen(buf+2)+1;

	for(int i=2;i<(row+1)*column;i++)
	{
		if(strcmp(pres[i],name) == 0 && strcmp(pres[i+1],passwd) == 0)
		{
			printf("login success...\n");
			if(sqlite3_close(db) != SQLITE_OK)
			{
				printf("sqlite3_close failed:%s __%d__\n", sqlite3_errmsg(db), __LINE__);
				return -1;
			}
			return 2;
		}
	}

	//关闭数据库，释放对应的内存空间
	if(sqlite3_close(db) != SQLITE_OK)
	{
		printf("sqlite3_close failed:%s __%d__\n", sqlite3_errmsg(db), __LINE__);
		return -1;
	}
	return 3;
}

4.1.4 查找单词

主要流程：

  1. 创建并打开数据库
  2. 创建数据表
  3. 匹配来自客户端的单词，若存在，则返回查询结果并将查询记录插入到数据表中，若不存在，则查询失败
  4. 关闭数据库
//插入记录
int Insert(sqlite3 *db,char *words,char *mean,char *save_buf)
{
	//获取当前时间
	time_t t;
	struct tm *info=NULL;
	char mytime[128] = "";

	t = time(NULL);
	info = localtime(&t);
	sprintf(mytime,"%d-%02d-%02d %02d:%02d:%02d",info->tm_year+1900,info->tm_mon+1,info->tm_mday,info->tm_hour,info->tm_min,info->tm_sec);

	//打开数据库
	if(sqlite3_open("./dict.db",&db) != SQLITE_OK)
	{
		fprintf(stderr,"sqlite3_open: %s __%d__\n",sqlite3_errmsg(db),__LINE__);
		return -1;
	}

	//创建一个表
	char sql[128] = "create table if not exists history (name char,word char,mean char,time char);";
	char *errmsg = NULL;
	char *name = save_buf;

	if(sqlite3_exec(db,sql,NULL,NULL,&errmsg) != SQLITE_OK)
	{
		fprintf(stderr,"sqlite3_exec: %s __%d__\n",errmsg,__LINE__);
		return -1;
	}

	//插入记录
	sprintf(sql,"insert into history values (\"%s\",\"%s\", \"%s\",\"%s\");",name,words, mean,mytime);
	if(sqlite3_exec(db, sql, NULL, NULL, &errmsg) != SQLITE_OK)
	{
		printf("sqlite3_exec failed:%s __%d__\n", errmsg, __LINE__);
		return -1;
	}
	printf("Insert success...\n");
}

//查询单词
int Search(sqlite3 *db,char *buf,char *save_buf)
{
	//打开数据库
	if(sqlite3_open("./dict.db",&db) != SQLITE_OK)
	{
		fprintf(stderr,"sqlite3_open: %s __%d__\n",sqlite3_errmsg(db),__LINE__);
		return -1;
	}

	char sql[128] = "select * from dict;";
	char **pres = NULL;
	int row,column;
	char *errmsg = NULL;
	if(sqlite3_get_table(db,sql,&pres,&row,&column,&errmsg) != SQLITE_OK)
	{
		fprintf(stderr,"sqlite3_get_table: %s __%d__\n",errmsg,__LINE__);
		return -1;
	}

	char *words = buf+2;

	for(int i=0;i<(row+1)*column;i++)
	{
		if(strcmp(pres[i],words) == 0)
		{
			//若查询成功，则将该单词插入记录
			Insert(db,words,pres[i+1],save_buf);
			bzero(buf, sizeof(buf));
			sprintf(buf,"\t%s\t\t%s\t",pres[i],pres[i+1]);
			if(sqlite3_close(db) != SQLITE_OK)
			{
				printf("sqlite3_close failed:%s __%d__\n", sqlite3_errmsg(db), __LINE__);
				return -1;
			}
			return 4;
		}
	}

	//关闭数据库，释放对应的内存空间
	if(sqlite3_close(db) != SQLITE_OK)
	{
		printf("sqlite3_close failed:%s __%d__\n", sqlite3_errmsg(db), __LINE__);
		return -1;
	}
	return 5;
}

4.1.5 查找历史记录

主要流程：

  1. 创建并打开数据库
  2. 创建数据表
  3. 匹配当前登录的用户名，若存在记录，则返回记录信息，若不存在，则查找失败
  4. 关闭数据库
//查询记录
int Search_res(sqlite3 *db,char *buf,char *save_buf)
{
	//打开数据库
	if(sqlite3_open("./dict.db",&db) != SQLITE_OK)
	{
		fprintf(stderr,"sqlite3_open: %s __%d__\n",sqlite3_errmsg(db),__LINE__);
		return -1;
	}

	char sql[128] = "create table if not exists history (name char,word char,mean char,time char);";
	char *errmsg = NULL;

	if(sqlite3_exec(db,sql,NULL,NULL,&errmsg) != SQLITE_OK)
	{
		fprintf(stderr,"sqlite3_exec: %s __%d__\n",errmsg,__LINE__);
		return -1;
	}

	char msg[128] = "";
	strcpy(sql,"select * from history;");
	char **pres = NULL;
	int row,column;
	if(sqlite3_get_table(db,sql,&pres,&row,&column,&errmsg) != SQLITE_OK)
	{
		fprintf(stderr,"sqlite3_get_table: %s __%d__\n",errmsg,__LINE__);
		return -1;
	}

	bzero(buf,sizeof(buf));
	for(int i=4;i<(row+1)*column;i++)
	{
		if(i%4==0 && strcmp(save_buf,pres[i]) == 0)
		{
			sprintf(msg,"%s\t%s\t%s\t%s\n",pres[i],pres[i+1],pres[i+2],pres[i+3]);
			strcat(buf,msg);
		}
	}
	if(strlen(buf)!=0)
		*(buf+strlen(buf)-1) = 0;
	//关闭数据库，释放对应的内存空间
	if(sqlite3_close(db) != SQLITE_OK)
	{
		printf("sqlite3_close failed:%s __%d__\n", sqlite3_errmsg(db), __LINE__);
		return -1;
	}
	if(strlen(buf) == 0)
		return 7;
	return 6;
}

4.2 客户端实现功能代码

#include "head.h"
int main(int argc, const char *argv[])
{
	sqlite3 *db = NULL;
	//创建流式套接字
	int cfd = socket(AF_INET,SOCK_STREAM,0);
	if(cfd < 0)
	{
		perror("socket");
		fprintf(stderr,"socket failed __%d__\n",__LINE__);
		return -1;
	}
	printf("socket success...\n");

	//设置允许端口号复用
    int reuse = 1;
    if(setsockopt(cfd, SOL_SOCKET, SO_REUSEADDR, &reuse, sizeof(reuse)) < 0)  
    {
        perror("setsockopt");
        return -1;
    }
	//填充地址信息结构体，真是的地址信息结构体根据地址族制定
	struct sockaddr_in sin;
	sin.sin_family = AF_INET;
	sin.sin_port = htons(PORT);
	sin.sin_addr.s_addr = inet_addr(IP);

	//连接服务器
	if(connect(cfd,(struct sockaddr *)&sin,sizeof(sin)) < 0)
	{
		perror("connetc");
		return -1;
	}
	printf("connect success...\n");

	ssize_t res = 0;
	char buf[128] = "";
	char save_buf[128] = "";
	while(1)
	{
		system("clear");
		printf("--------------------------\n");
		printf("--------1.REGISTER--------\n");
		printf("--------2.LOGIN-----------\n");
		printf("--------3.EXIE------------\n");
		printf("--------------------------\n");

		bzero(buf,sizeof(buf));
		printf("please enter>>>");
		fgets(buf,sizeof(buf),stdin);
		buf[strlen(buf)-1] = 0;



		char name[20]   = "";
		char passwd[20] = "";

		if(strcmp(buf,"1") == 0)
		{
			printf("please enter name>>>");
			scanf("%s",name);
			getchar();
			printf("please enter passwd>>>");
			scanf("%s",passwd);
			getchar();
			sprintf(buf,"%s%c%s%c%s","1",0,name,0,passwd);
		}
		else if(strcmp(buf,"2") == 0)
		{
			printf("please enter name>>>");
			scanf("%s",name);
			getchar();
			printf("please enter passwd>>>");
			scanf("%s",passwd);
			getchar();
			sprintf(buf,"%s%c%s%c%s","2",0,name,0,passwd);
		}
		else if(strcmp(buf,"3") == 0)
			break;

		//发送数据
		if(send(cfd,buf,sizeof(buf),0) < 0)
		{
			perror("send");
			return -1;
		}
	
		//接受数据
		bzero(buf,sizeof(buf));
		res = recv(cfd,buf,sizeof(buf),0);
		if(res < 0)
		{
			perror("recv");
			return -1;
		}
		else if(0 == res)
		{
			printf("[%s : %d] server offline\n",IP,PORT);
			break;
		}
		printf("%s\n",buf);

		//另存buf
		strcpy(save_buf,buf);
		while(strcmp(save_buf,"[login success!]") == 0)
		{
			system("clear");
			printf("--------------------------\n");
			printf("-------1.SEARCH WORDS-----\n");
			printf("-------2.HISTORICAL ------\n");
			printf("-------3.EXIE LOGIN-------\n");
			printf("--------------------------\n");

			bzero(buf,sizeof(buf));
			printf("please enter>>>");
			fgets(buf,sizeof(buf),stdin);
			buf[strlen(buf)-1] = 0;

			char words[20] = "";

			if(strcmp(buf,"1") == 0)
			{
				while(1)
				{
					bzero(buf,sizeof(buf));
					printf("please enter word(enter \"quit\" finished)>>>");
					scanf("%s",words);
					getchar();
					if(strcmp(words,"quit") == 0)
						break;
					sprintf(buf,"%s%c%s%c","3",0,words,0);

					//发送数据
					if(send(cfd,buf,sizeof(buf),0) < 0)
					{
						perror("send");
						return -1;
					}
					//接收查询单词结果
					bzero(buf,sizeof(buf));
					res = recv(cfd,buf,sizeof(buf),0);
					if(res < 0)
					{
						perror("recv");
						return -1;
					}
					else if(0 == res)
					{
						printf("[%s : %d] server offline\n",IP,PORT);
						//	break;
						goto END;
					}
					printf("%s\n",buf);
				}
			}
			else if(strcmp(buf,"2") == 0)
			{
				sprintf(buf,"%s%c","4",0);

				//发送数据
				if(send(cfd,buf,sizeof(buf),0) < 0)
				{
					perror("send");
					return -1;
				}
				//接受查询单词结果
				bzero(buf,sizeof(buf));
				res = recv(cfd,buf,sizeof(buf),0);
				if(res < 0)
				{
					perror("recv");
					return -1;
				}
				else if(0 == res)
				{
					printf("[%s : %d] server offline\n",IP,PORT);
					goto END;
				//	break;
				}
				printf("%s\n",buf);
			}
			else if(strcmp(buf,"3") == 0)
				break;

			printf("enter any character to clear>>>");
			while(getchar()!=10);
		}
		printf("enter any character to clear>>>");
		while(getchar()!=10);
	}
END:
	//关闭所有文件描述符
	close(cfd);
	return 0;
}

五、完整代码

5.1 头文件

#ifndef __HEAD_H__
#define __HEAD_H__

#include <stdio.h>
#include <sqlite3.h>
#include <string.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <stdlib.h>
#include <unistd.h>
#include <signal.h>
#include <sys/wait.h>
#include <time.h>


#define PORT 8808
//#define IP "192.168.122.92"
#define IP "10.102.144.7"
#define ERR_MSG(msg) { fprintf(stderr,"__%d__",__LINE__); perror(msg); }

int import_dict(sqlite3 *db);
int Register(sqlite3 *db,char *buf);
int Login(sqlite3 *db,char *buf);
int Search(sqlite3 *db,char *buf,char *save_buf);
int Insert(sqlite3 *db,char *words,char *mean,char *save_buf);
int do_select_user(sqlite3 *db,char *name);
void handler(int sig);
int deal_cli_msg(int newfd,struct sockaddr_in cin,sqlite3 *db);
int Search_res(sqlite3 *db,char *buf,char *save_buf);

#endif

5.2 功能函数

#include "head.h"

//导入词典
int import_dict(sqlite3 *db)
{
	if(sqlite3_open("./dict.db",&db) != SQLITE_OK)
	{
		fprintf(stderr,"sqlite3_open: %s __%d__\n",sqlite3_errmsg(db),__LINE__);
		return -1;
	}

	//创建一个表
	char sql[128] = "create table if not exists dict (word char,mean char);";
	char *errmsg = NULL;

	if(sqlite3_exec(db,sql,NULL,NULL,&errmsg) != SQLITE_OK)
	{
		fprintf(stderr,"sqlite3_exec: %s __%d__\n",errmsg,__LINE__);
		return -1;
	}

	//打开文件
	FILE* fp = fopen("./dict.txt", "r");
	if(NULL == fp)
	{
		perror("fopen");
		return -1;
	}

	//循环读取文件中的数据，一行一行的读取
	char buf[256] = "";
	char word[32] = "";
	char mean[200] = "";
	int count = 1;
	int i = 0;
	char* ptr = NULL;

	printf("importing dictionary...\n");
	while(1)
	{
		if(fgets(buf, sizeof(buf), fp) == NULL)
			break;
		buf[strlen(buf)-1] = 0;

		//分离单词和意思
		bzero(word, sizeof(word));
		bzero(mean, sizeof(mean));

		//获取"  "子串在buf中的地址
		ptr = strstr(buf, "  ");
		if(NULL == ptr)
		{
			printf("没有找到对应子串\n");
			break;
		}
		strncpy(word, buf, ptr-buf);    //"  "子串前面是单词
		strcpy(mean, ptr+3);        //"  "子串后面是意思                               

		//插入到数据库中
		sprintf(sql,"insert into dict values (\"%s\", \"%s\");", word, mean);
		if(sqlite3_exec(db, sql, NULL, NULL, &errmsg) != SQLITE_OK)
		{
			printf("sqlite3_exec failed:%s __%d__\n", errmsg, __LINE__);
			return -1;
		}
	}

	//关闭文件
	fclose(fp);

	//关闭数据库，释放对应的内存空间
	if(sqlite3_close(db) != SQLITE_OK)
	{
		printf("sqlite3_close failed:%s __%d__\n", sqlite3_errmsg(db), __LINE__);
		return -1;
	}
	printf("dictionary import completed...\n");
	return 0;
}


//匹配用户名是否存在
int do_select_user(sqlite3 *db,char *name)
{
	char sql[128] = "select name from user;";
	char **pres = NULL;
	int row,column;
	char *errmsg = NULL;
	if(sqlite3_get_table(db,sql,&pres,&row,&column,&errmsg) != SQLITE_OK)
	{
		fprintf(stderr,"sqlite3_exec: %s __%d__\n",errmsg,__LINE__);
		return -1;
	}

	for(int i=1;i<(row+1)*column;i++)
	{
		if(strcmp(pres[i],name) == 0)
		{
			fprintf(stderr,"sqlite3_exec: name already existss\n");
			return 1;
		}
	}
	return 0;
}
//实现注册功能
int Register(sqlite3 *db,char *buf)
{
	//打开数据库
	if(sqlite3_open("./dict.db",&db) != SQLITE_OK)
	{
		fprintf(stderr,"sqlite3_open: %s __%d__\n",sqlite3_errmsg(db),__LINE__);
		return -1;
	}

	//创建一个表
	char sql[128] = "create table if not exists user (name char,passwd char);";
	char *errmsg = NULL;

	if(sqlite3_exec(db,sql,NULL,NULL,&errmsg) != SQLITE_OK)
	{
		fprintf(stderr,"sqlite3_exec: %s __%d__\n",errmsg,__LINE__);
		return -1;
	}

	char *name = buf+2;
	char *passwd = buf+2+strlen(buf+2)+1;

	if(do_select_user(db,name) == 1)
	{
		if(sqlite3_close(db) != SQLITE_OK)
		{
			printf("sqlite3_close failed:%s __%d__\n", sqlite3_errmsg(db), __LINE__);
			return -1;
		}
		return 1;
	}
	sprintf(sql,"insert into user values ('%s','%s');",name,passwd);
	if(sqlite3_exec(db,sql,NULL,NULL,&errmsg) != SQLITE_OK)
	{
		fprintf(stderr,"sqlite3_exec: %s __%d__\n",errmsg,__LINE__);
		return -1;
	}
	printf("register success...\n");

	//关闭数据库，释放对应的内存空间
	if(sqlite3_close(db) != SQLITE_OK)
	{
		printf("sqlite3_close failed:%s __%d__\n", sqlite3_errmsg(db), __LINE__);
		return -1;
	}
	return 0;
}
//实现登录功能
int Login(sqlite3 *db,char *buf)
{
	//打开数据库
	if(sqlite3_open("./dict.db",&db) != SQLITE_OK)
	{
		fprintf(stderr,"sqlite3_open: %s __%d__\n",sqlite3_errmsg(db),__LINE__);
		return -1;
	}

	char sql[128] = "create table if not exists user (name char,passwd char);";
	char *errmsg = NULL;

	if(sqlite3_exec(db,sql,NULL,NULL,&errmsg) != SQLITE_OK)
	{
		fprintf(stderr,"sqlite3_exec: %s __%d__\n",errmsg,__LINE__);
		return -1;
	}

	strcpy(sql,"select * from user;");
	char **pres = NULL;
	int row,column;
	if(sqlite3_get_table(db,sql,&pres,&row,&column,&errmsg) != SQLITE_OK)
	{
		fprintf(stderr,"sqlite3_exec: %s __%d__\n",errmsg,__LINE__);
		return -1;
	}

	char *name = buf+2;
	char *passwd = buf+2+strlen(buf+2)+1;

	for(int i=2;i<(row+1)*column;i++)
	{
		if(strcmp(pres[i],name) == 0 && strcmp(pres[i+1],passwd) == 0)
		{
			printf("login success...\n");
			if(sqlite3_close(db) != SQLITE_OK)
			{
				printf("sqlite3_close failed:%s __%d__\n", sqlite3_errmsg(db), __LINE__);
				return -1;
			}
			return 2;
		}
	}

	//关闭数据库，释放对应的内存空间
	if(sqlite3_close(db) != SQLITE_OK)
	{
		printf("sqlite3_close failed:%s __%d__\n", sqlite3_errmsg(db), __LINE__);
		return -1;
	}
	return 3;
}
//插入记录
int Insert(sqlite3 *db,char *words,char *mean,char *save_buf)
{
	//获取当前时间
	time_t t;
	struct tm *info=NULL;
	char mytime[128] = "";

	t = time(NULL);
	info = localtime(&t);
	sprintf(mytime,"%d-%02d-%02d %02d:%02d:%02d",info->tm_year+1900,info->tm_mon+1,info->tm_mday,info->tm_hour,info->tm_min,info->tm_sec);

	//打开数据库
	if(sqlite3_open("./dict.db",&db) != SQLITE_OK)
	{
		fprintf(stderr,"sqlite3_open: %s __%d__\n",sqlite3_errmsg(db),__LINE__);
		return -1;
	}

	//创建一个表
	char sql[128] = "create table if not exists history (name char,word char,mean char,time char);";
	char *errmsg = NULL;
	char *name = save_buf;

	if(sqlite3_exec(db,sql,NULL,NULL,&errmsg) != SQLITE_OK)
	{
		fprintf(stderr,"sqlite3_exec: %s __%d__\n",errmsg,__LINE__);
		return -1;
	}

	//插入记录
	sprintf(sql,"insert into history values (\"%s\",\"%s\", \"%s\",\"%s\");",name,words, mean,mytime);
	if(sqlite3_exec(db, sql, NULL, NULL, &errmsg) != SQLITE_OK)
	{
		printf("sqlite3_exec failed:%s __%d__\n", errmsg, __LINE__);
		return -1;
	}
	printf("Insert success...\n");
}

//查询单词
int Search(sqlite3 *db,char *buf,char *save_buf)
{
	//打开数据库
	if(sqlite3_open("./dict.db",&db) != SQLITE_OK)
	{
		fprintf(stderr,"sqlite3_open: %s __%d__\n",sqlite3_errmsg(db),__LINE__);
		return -1;
	}

	char sql[128] = "select * from dict;";
	char **pres = NULL;
	int row,column;
	char *errmsg = NULL;
	if(sqlite3_get_table(db,sql,&pres,&row,&column,&errmsg) != SQLITE_OK)
	{
		fprintf(stderr,"sqlite3_get_table: %s __%d__\n",errmsg,__LINE__);
		return -1;
	}

	char *words = buf+2;

	for(int i=0;i<(row+1)*column;i++)
	{
		if(strcmp(pres[i],words) == 0)
		{
			//若查询成功，则将该单词插入记录
			Insert(db,words,pres[i+1],save_buf);
			bzero(buf, sizeof(buf));
			sprintf(buf,"\t%s\t\t%s\t",pres[i],pres[i+1]);
			if(sqlite3_close(db) != SQLITE_OK)
			{
				printf("sqlite3_close failed:%s __%d__\n", sqlite3_errmsg(db), __LINE__);
				return -1;
			}
			return 4;
		}
	}

	//关闭数据库，释放对应的内存空间
	if(sqlite3_close(db) != SQLITE_OK)
	{
		printf("sqlite3_close failed:%s __%d__\n", sqlite3_errmsg(db), __LINE__);
		return -1;
	}
	return 5;
}

//查询记录
int Search_res(sqlite3 *db,char *buf,char *save_buf)
{
	//打开数据库
	if(sqlite3_open("./dict.db",&db) != SQLITE_OK)
	{
		fprintf(stderr,"sqlite3_open: %s __%d__\n",sqlite3_errmsg(db),__LINE__);
		return -1;
	}

	char sql[128] = "create table if not exists history (name char,word char,mean char,time char);";
	char *errmsg = NULL;

	if(sqlite3_exec(db,sql,NULL,NULL,&errmsg) != SQLITE_OK)
	{
		fprintf(stderr,"sqlite3_exec: %s __%d__\n",errmsg,__LINE__);
		return -1;
	}

	char msg[128] = "";
	strcpy(sql,"select * from history;");
	char **pres = NULL;
	int row,column;
	if(sqlite3_get_table(db,sql,&pres,&row,&column,&errmsg) != SQLITE_OK)
	{
		fprintf(stderr,"sqlite3_get_table: %s __%d__\n",errmsg,__LINE__);
		return -1;
	}

	bzero(buf,sizeof(buf));
	for(int i=4;i<(row+1)*column;i++)
	{
		if(i%4==0 && strcmp(save_buf,pres[i]) == 0)
		{
			sprintf(msg,"%s\t%s\t%s\t%s\n",pres[i],pres[i+1],pres[i+2],pres[i+3]);
			strcat(buf,msg);
		}
	}
	if(strlen(buf)!=0)
		*(buf+strlen(buf)-1) = 0;
	//关闭数据库，释放对应的内存空间
	if(sqlite3_close(db) != SQLITE_OK)
	{
		printf("sqlite3_close failed:%s __%d__\n", sqlite3_errmsg(db), __LINE__);
		return -1;
	}
	if(strlen(buf) == 0)
		return 7;
	return 6;
}
//服务器子进程处理客户端信息
int deal_cli_msg(int newfd,struct sockaddr_in cin,sqlite3 *db)
{
	int flag = 0;  
	char buf[128] = "";
	char save_buf[128] = "";
	ssize_t res = 0;
	int f_res = -1;
	while(1)
	{
		bzero(buf, sizeof(buf));
		//接收数据
		res = recv(newfd, buf, sizeof(buf), 0);
		if(res < 0)
		{
			ERR_MSG("recv");
			return -1;
		}
		else if(0 == res)
		{
			printf("[%s : %d] client offline\n",inet_ntoa(cin.sin_addr), ntohs(cin.sin_port));                                  
			break;
		}

		//调用功能函数
		if(strcmp(buf,"1") == 0)
			f_res = Register(db,buf); //注册
		else if(strcmp(buf,"2") == 0)
		{
			f_res = Login(db,buf);    //登录
			strcpy(save_buf,buf+2);     //将用户名另存
		}
		else if(strcmp(buf,"3") == 0)
		{
			f_res = Search(db,buf,save_buf);   //查询单词
		}
		else if(strcmp(buf,"4") == 0)
			f_res = Search_res(db,buf,save_buf);   //查询记录


		//发送数据
		if(0 == f_res)
		{
			bzero(buf, sizeof(buf));
			strcpy(buf,"[register success!]");
		}
		else if(1 == f_res)
		{	
			bzero(buf, sizeof(buf));
			strcpy(buf,"[register failed,name already exists!]");
		}
		else if(2 == f_res)
		{
			bzero(buf, sizeof(buf));
			strcpy(buf,"[login success!]");
		}
		else if(3 == f_res)
		{
			bzero(buf, sizeof(buf));
			strcpy(buf,"[login failed,name/passwd does not exists!]");
		}
		else if(4 == f_res)
		{
		}
		else if(5 == f_res)
		{
			bzero(buf, sizeof(buf));
			strcpy(buf,"[words not find!]");
		}
		else if(6 == f_res)
		{
		}
		else if(7 == f_res)
		{
			bzero(buf, sizeof(buf));
			strcpy(buf,"[not find history!]");
		}

		if(send(newfd, buf, sizeof(buf), 0) < 0)
		{
			ERR_MSG("send");
			return -1;
		}
	}
	close(newfd);
	return 0;
}
//捕获信号
void handler(int sig)
{
    while(waitpid(-1, NULL, WNOHANG) > 0);
}

5.3 服务器

#include "head.h"
int main(int argc, const char *argv[])
{
	sqlite3 *db = NULL;

    if(signal(17, handler) == SIG_ERR)
    {
        ERR_MSG("signal");
        return -1;
    }
	//导入词典
	import_dict(db);

	//创建流式套接字
	int sfd = socket(AF_INET,SOCK_STREAM,0);
	if(sfd < 0)
	{
		ERR_MSG("socket");
		return -1;
	}

    //设置允许端口号复用
    int reuse = 1;
    if(setsockopt(sfd, SOL_SOCKET, SO_REUSEADDR, &reuse, sizeof(reuse)) < 0)  
    {                                                                          
        perror("setsockopt");
        return -1;
    }

	//绑定服务器IP和端口号
	struct sockaddr_in sin;
	sin.sin_family = AF_INET;
	sin.sin_port = htons(PORT);
	sin.sin_addr.s_addr = inet_addr(IP);
	if(bind(sfd,(struct sockaddr *)&sin,sizeof(sin)) < 0)
	{
		ERR_MSG("bind");
		return -1;
	}

	//将套接字设置为被动监听状态
	if(listen(sfd,10) < 0)
	{
		ERR_MSG("listen");
		return -1;
	}
	
	int newfd = -1;
	struct sockaddr_in cin;
	socklen_t addrlen = sizeof(cin);

	//从已完成连接的队列中获取一个客户端信息，生成一个新的文件描述符
	while(1)
	{
		newfd = accept(sfd,(struct sockaddr *)&cin,&addrlen);
		if(newfd < 0)
		{
			ERR_MSG("accept");
			return -1;
		}
		printf("[%s : %d] connect success...\n",inet_ntoa(cin.sin_addr), ntohs(cin.sin_port));
		if(0 == fork())
		{
			close(sfd);
			deal_cli_msg(newfd,cin,db);
			exit(0);
		}
		close(newfd);
	}
	close(sfd);
	return 0;
}

5.4 客户端 

#include "head.h"
int main(int argc, const char *argv[])
{
	sqlite3 *db = NULL;
	//创建流式套接字
	int cfd = socket(AF_INET,SOCK_STREAM,0);
	if(cfd < 0)
	{
		perror("socket");
		fprintf(stderr,"socket failed __%d__\n",__LINE__);
		return -1;
	}
	printf("socket success...\n");

	//设置允许端口号复用
    int reuse = 1;
    if(setsockopt(cfd, SOL_SOCKET, SO_REUSEADDR, &reuse, sizeof(reuse)) < 0)  
    {
        perror("setsockopt");
        return -1;
    }
	//填充地址信息结构体，真是的地址信息结构体根据地址族制定
	struct sockaddr_in sin;
	sin.sin_family = AF_INET;
	sin.sin_port = htons(PORT);
	sin.sin_addr.s_addr = inet_addr(IP);

	//连接服务器
	if(connect(cfd,(struct sockaddr *)&sin,sizeof(sin)) < 0)
	{
		perror("connetc");
		return -1;
	}
	printf("connect success...\n");

	ssize_t res = 0;
	char buf[128] = "";
	char save_buf[128] = "";
	while(1)
	{
		system("clear");
		printf("--------------------------\n");
		printf("--------1.REGISTER--------\n");
		printf("--------2.LOGIN-----------\n");
		printf("--------3.EXIE------------\n");
		printf("--------------------------\n");

		bzero(buf,sizeof(buf));
		printf("please enter>>>");
		fgets(buf,sizeof(buf),stdin);
		buf[strlen(buf)-1] = 0;



		char name[20]   = "";
		char passwd[20] = "";

		if(strcmp(buf,"1") == 0)
		{
			printf("please enter name>>>");
			scanf("%s",name);
			getchar();
			printf("please enter passwd>>>");
			scanf("%s",passwd);
			getchar();
			sprintf(buf,"%s%c%s%c%s","1",0,name,0,passwd);
		}
		else if(strcmp(buf,"2") == 0)
		{
			printf("please enter name>>>");
			scanf("%s",name);
			getchar();
			printf("please enter passwd>>>");
			scanf("%s",passwd);
			getchar();
			sprintf(buf,"%s%c%s%c%s","2",0,name,0,passwd);
		}
		else if(strcmp(buf,"3") == 0)
			break;

		//发送数据
		if(send(cfd,buf,sizeof(buf),0) < 0)
		{
			perror("send");
			return -1;
		}
	
		//接受数据
		bzero(buf,sizeof(buf));
		res = recv(cfd,buf,sizeof(buf),0);
		if(res < 0)
		{
			perror("recv");
			return -1;
		}
		else if(0 == res)
		{
			printf("[%s : %d] server offline\n",IP,PORT);
			break;
		}
		printf("%s\n",buf);

		//另存buf
		strcpy(save_buf,buf);
		while(strcmp(save_buf,"[login success!]") == 0)
		{
			system("clear");
			printf("--------------------------\n");
			printf("-------1.SEARCH WORDS-----\n");
			printf("-------2.HISTORICAL ------\n");
			printf("-------3.EXIE LOGIN-------\n");
			printf("--------------------------\n");

			bzero(buf,sizeof(buf));
			printf("please enter>>>");
			fgets(buf,sizeof(buf),stdin);
			buf[strlen(buf)-1] = 0;

			char words[20] = "";

			if(strcmp(buf,"1") == 0)
			{
				while(1)
				{
					bzero(buf,sizeof(buf));
					printf("please enter word(enter \"quit\" finished)>>>");
					scanf("%s",words);
					getchar();
					if(strcmp(words,"quit") == 0)
						break;
					sprintf(buf,"%s%c%s%c","3",0,words,0);

					//发送数据
					if(send(cfd,buf,sizeof(buf),0) < 0)
					{
						perror("send");
						return -1;
					}
					//接收查询单词结果
					bzero(buf,sizeof(buf));
					res = recv(cfd,buf,sizeof(buf),0);
					if(res < 0)
					{
						perror("recv");
						return -1;
					}
					else if(0 == res)
					{
						printf("[%s : %d] server offline\n",IP,PORT);
						//	break;
						goto END;
					}
					printf("%s\n",buf);
				}
			}
			else if(strcmp(buf,"2") == 0)
			{
				sprintf(buf,"%s%c","4",0);

				//发送数据
				if(send(cfd,buf,sizeof(buf),0) < 0)
				{
					perror("send");
					return -1;
				}
				//接受查询单词结果
				bzero(buf,sizeof(buf));
				res = recv(cfd,buf,sizeof(buf),0);
				if(res < 0)
				{
					perror("recv");
					return -1;
				}
				else if(0 == res)
				{
					printf("[%s : %d] server offline\n",IP,PORT);
					goto END;
				//	break;
				}
				printf("%s\n",buf);
			}
			else if(strcmp(buf,"3") == 0)
				break;

			printf("enter any character to clear>>>");
			while(getchar()!=10);
		}
		printf("enter any character to clear>>>");
		while(getchar()!=10);
	}
END:
	//关闭所有文件描述符
	close(cfd);
	return 0;
}
08-20 13:14
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