这是一个嵌入式实训项目，难度中等，用到了QT4知识，linux socket编程，arm驱动等.......代码分为三个内容，客户端，也就是摄像头数据采集端，服务器端，也就是二维码解码端，驱动部分运用了按键中断，pwd。摄像头是v4l2，也就是vedio for linux ，这部分的介绍网上有很多，我就不一一介绍了。开发板是用mini440,内存大小是64M，可能大点的程序比较费劲，所以我采用的客户端/服务器模式，即C/S模式。
SHOW FULL COLUMNS FROM `jrk_downrecords` [ RunTime:0.001279s ]
SELECT `a`.`aid`,`a`.`title`,`a`.`create_time`,`m`.`username` FROM `jrk_downrecords` `a` INNER JOIN `jrk_member` `m` ON `a`.`uid`=`m`.`id` WHERE `a`.`status` = 1 GROUP BY `a`.`aid` ORDER BY `a`.`create_time` DESC LIMIT 10 [ RunTime:0.097725s ]
SHOW FULL COLUMNS FROM `jrk_tagrecords` [ RunTime:0.001132s ]
SELECT * FROM `jrk_tagrecords` WHERE `status` = 1 ORDER BY `num` DESC LIMIT 20 [ RunTime:0.001864s ]
SHOW FULL COLUMNS FROM `jrk_member` [ RunTime:0.001207s ]
SELECT `id`,`username`,`userhead`,`usertime` FROM `jrk_member` WHERE `status` = 1 ORDER BY `usertime` DESC LIMIT 10 [ RunTime:0.003883s ]
SHOW FULL COLUMNS FROM `jrk_searchrecords` [ RunTime:0.001039s ]
SELECT * FROM `jrk_searchrecords` WHERE `status` = 1 ORDER BY `num` DESC LIMIT 5 [ RunTime:0.003199s ]
SELECT aid,title,count(aid) as c FROM `jrk_downrecords` GROUP BY `aid` ORDER BY `c` DESC LIMIT 10 [ RunTime:0.014933s ]
SHOW FULL COLUMNS FROM `jrk_articles` [ RunTime:0.001398s ]
UPDATE `jrk_articles` SET `hits` = 1 WHERE `id` = 329531 [ RunTime:0.001401s ]
