Sign In System--Fingerprint（指纹识别系统）

         指纹识别签到系统， 虽然目前这个软件普遍存在， 但是起码我自己一个人一行又一行的敲出了自己的指纹签到软件， 耗费了60个小时， 共计1500行左右的代码， 运行环境是Linux， 用qtcreator2.7.1配合qt4.8.4暂时完成整个项目，数据库采用SQLITE。 主要功能有， 指纹签到， 增加删除查找修改学生的信息， 查找旷课迟到请假指定次数以上的学生， 并能保存成xls文件方便存储数据。 

       由于是第一次用QT做软件， 而且本人有轻微强迫症， 所以设计界面的时候花费了比较多的时间， 整个项目比较难的就是指纹模块的通信以及整个识别过程的控制， 开始几天都不能成功与FPMA10A通信， 经过多次尝试终于成功了。 剩下的基本都是数据库的操作， 因为学过SQL语句， 所以操作起来也比较简单。

       第一次做软件， 第一个感觉就是乱， 没有事先的模块化设计， 没有相应类的设计， 就直接画了界面， 然后就写代码实现了。 这样的工程以后维护起来就麻烦了，  最近看了软件工程， 更是觉得设计的规划的重要性。 其次还有一个文档的问题， 当然， 我也没写相关的总体设计文档， 测试文档等等， 这也是不利于维护的。 不过自己用英文写了的用户使用文档， 虽然语法多有错误， 但是第一次尝试用英文写文档， 感觉还不错， 还有一点就是我的代码有比较全面的注释， 也都是用英文写的， 写注释当然也是为了以后能方便维护。

        总结一下， 这次小项目技术性不是很高， 但也不是很简单， 实践果然是理论知识的最佳助手。 对于软件的规范性等， 我想在下一个项目， Shell，中来实践一下。下面附上几张软件截图, 以及README, ， 欢迎大家共同交流

【Welcome】

【Main Window】

【Others】

【After sign in】

【README】

                (C) 2013 HuangJinDongDecember 27, 2013SIMPLE DESCRIPTION==================    This is a system for sign in. It can use in the class that need it.Maybe you can call it as "Sign In System".It spent me almost one mouth to finish it. In fact, it is not finished because you know that, all of the software have been not finished ever. But, this system works well and you can use it to sign in or search students information or look up who truancy this class and so on. See more functions in HOW TO USE.HOW TO USE=================       --Previous      There are not obvious information how to use it show      on the interface, but you can see them if you put your      cursor on the button. To do that is to let the gui looks      more simply.    --Register      As a teacher, if you have no counter to log in then       you should register first.     --Log in      Input your counter's information to log in the system.    --Start sign in      Make sure that your system connect with the FMPA10A.      Then click the power on button to start sign in.       And put student's finger on the FMPA10A and wait for      3s or more (I will improve it in the future) then you      can see corresponding picture on gui is lighted! It      indicates you sign in succeed. Of course, the premise      is the student is a member of this class.        --Stop sign in       Double click the power button if you won't sign in      any more.         --Look up      In the look up line edit, you can input ID or name       to search the corresponding student. Moreover, you      can input "a:num" or "b:num" or "t:num" to search       ask for leave at least num times or be late at least      num times or truancy at least num times respectively.      Especially, input "a:" and "b:" and "t:" so that       search all students. By the way, the result of search      will show in abt window.     --Add student      If you want to add a student to database, you can      click the + button and click add button after you      finish your input.       --Refresh      You should click the refresh button after you add      a student in order to show his picture on the gui.    --Abt window      You can press up to look the previous page and press      down to see the next page. In addition, you save the      students's information on the abt window into *.xls      file if you double click the down button. Of course,      you can see more information about the student by       press the corresponding student's button.    --Student ifo window      Obviously, you can modify student's information by       click modify button and delete student by click       delete button or click cancel button to cancel this      operation. By the way, the function of teacher's       evaluate and student's evaluate is not implemented.      (It will be implemented later)    --Others      It is the main function that I mention above. Other      function you can use without look this file. CONTACT WITH ME==================    [e-mail]