dblogin.c

在LINUX下实现的一个超市的收银系统

#include "extern.h"

/*===========数据库登录==========*/
void DbLogin()
{
	int ch,temp,state,i;
	
	i=ReadConfig("dbconfig.conf");
	
	if(i)
	{
		state=checkconnect(DBNAME,DBUSER,DBPASSWD);
		
		/*=========为了测试，这里直接调用销售函数,或者后台管理函数====================*/
		//Cashier();
		//BackManager();
		//正确的话进入登录界面
		if(state == 1)
		{
			ShowMessage("          正在连接数据库......");					
			ShowMessage("             连接成功.......");
			clear();
			refresh();
			UserLogin();
		}
		else
		{
			ShowMessage("          正在连接数据库......");					
			ShowMessage("             连接失败.......");
			clear();
			refresh();
		}
	}

    bkgd(COLOR_PAIR(1));
    refresh();	
    WINDOW *new_win = newwin(10,40,7,20);
	WINDOW *db_name_win = subwin(new_win,1,20,9,31);
	WINDOW *db_user_win = subwin(new_win,1,20,11,31);
	WINDOW *db_pwd_win = subwin(new_win,1,20,13,31);

	wbkgd(new_win,COLOR_PAIR(9));
	wbkgd(db_name_win,COLOR_PAIR(10));
	wbkgd(db_user_win,COLOR_PAIR(10));
	wbkgd(db_pwd_win,COLOR_PAIR(10));
	
	do
	{
    	wclear(db_name_win); 
		wclear(db_user_win); 
		wclear(db_pwd_win); 
		box(new_win,0,0);
		mvwprintw(new_win,0,15,"数据库登录");
		mvwprintw(new_win,2,2,"数据库名:");
		mvwprintw(new_win,4,4,"用户名:");
		mvwprintw(new_win,6,6,"密码:");

		mvwprintw(new_win,8,8,"确定");
		mvwprintw(new_win,8,28,"取消");
		wrefresh(new_win);
			
        //清除输入
        memset(DBNAME,0,sizeof(DBNAME));
        memset(DBUSER,0,sizeof(DBUSER));
        memset(DBPASSWD,0,sizeof(DBPASSWD));
		echo();
        nocbreak();
		//输入数据库名称
       	mvwgetnstr(db_name_win,0,0,DBNAME,20);
		//输入用户名称
        mvwgetnstr(db_user_win,0,0,DBUSER,20);
        noecho();
        cbreak();

        keypad(db_pwd_win,TRUE);
        //输入密码
        temp = 0;
        ch = mvwgetch(db_pwd_win,0,0+temp);
        //判断输入的密码是否为合法字符
        while(ch != '\n')
        {
            if(isprint(ch) && (!isspace(ch)))
            {
                mvwaddch(db_pwd_win,0,0+temp,'*');
				touchwin(new_win);
                wrefresh(db_pwd_win);
                DBPASSWD[temp] = ch;
                temp++;
                if(temp >19)
                {
                    break;
                }
            }
            else if(ch == KEY_BACKSPACE)
            {
                if(temp > 0)
                {
                    --temp;
                    wmove(db_pwd_win,0,0+temp);
                   // wclrtoeol(new_win);
					mvwprintw(db_pwd_win,0,0+temp," ");
					wrefresh(db_pwd_win);
                }
                else
                {
                    wmove(db_pwd_win,0,0);
                    wclrtoeol(db_pwd_win);
 				}
            }
            ch = mvwgetch(db_pwd_win,0,0+temp);
		}
		keypad(db_pwd_win,FALSE);	

        DBPASSWD[temp] = '\0';

        do
        {
            wattron(new_win,A_BLINK);
            mvwprintw(new_win,8,8,"确定");
            ch = mvwgetch(new_win,8,12);
            wattroff(new_win,A_BLINK);
            wrefresh(new_win);
            //判断用户的输入
            if(ch == '\n')
            {
				state=checkconnect(DBNAME,DBUSER,DBPASSWD);
				//正确的话进入登录界面
				if(state == 1)
				{
					ShowMessage("          正在连接数据库......");					
					ShowMessage("             连接成功.......");
					SaveConfig(DBNAME,DBUSER,DBPASSWD);
					delwin(new_win);
					clear();
					refresh();
					UserLogin();
				}
				//错误的话提示出去,继续输入
				else 
				{ 
					ShowMessage("         连接失败,请重新输入");
					SaveConfig(DBNAME,DBUSER,DBPASSWD);
					
					delwin(new_win);
					clear;
					refresh();
					break;
				}
			}

			else
            {			
                    mvwprintw(new_win,8,8,"确定");
                    wattron(new_win,A_BLINK);
                    mvwprintw(new_win,8,28,"取消");
                    ch = mvwgetch(new_win,8,32);
                    wattroff(new_win,A_BLINK);
					
                    if(ch == '\n')
                    {
						delwin(new_win);
						clear;
						refresh();
						break;
                    }
                    else 
                    {
						mvwprintw(new_win,8,28,"取消");
						continue;
                    }
			}
        }while(1);

    }while (1);

    echo();
	keypad(new_win,FALSE);
    nocbreak();
    clear();
    wrefresh(new_win);
    endwin();
    exit(0);
}