利用iTextSharp第三方开源代码，很方便的生成pdf文件，包括图片、格式排版。...

判断数据是否为空值不是则转换为其他指定类型.-To determine whether the data value is not empty then converted to other specified types.

说明：  VC++与Matlab通过COM技术实现混合编程的四个例子，含VC++6.0和.NET版本。(VC++ and Matlab through COM technology to achieve the four examples of mixed programming, with VC++6.0 and. NET version.)

自定义分页控件,从CONTROL类继承,可以学习控件的开发方式-Custom paging control class inherits from CONTROL, you can learn the control of the development mode

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单生产者、单消费者，无锁缓冲队列实现。在轻度和中度争用情况下，无锁算法比基于锁的算法性能好很多，在争用非常严重的情况下（100个并发线程以上/每CPU），基于锁的算法性能开始显示出优势，因为一旦发生争用，基于锁的算法会立刻切换到其他线程，而无锁算法会进入下一次循环，导致CPU的占用。

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程序格式规范说明，这是公司内部的文档，大家可以参考-Program format specification, which is the company s internal documents, we can refer to

用 VB.NET 和 C# 编程时，需要在程序运行时支持用户代码完成某些定制操作，本例引入Perl脚本支持，在需要时可以通过外部提供的Perl脚本完成特定的操作。比如在读入外部文本数据时，可以先用Perl做某种预处理。PerlRE.perlnet 是 ActiveState Dev Kit 9.5.1 的编译工程，将 pm 文件编译为.NET支持的dll文件PerlRE.pm 是 .NET 和 Perl 的接口文件源码PerlRE.dll 是 接口源码编译完成的动态链接库文件支持 .NET 2.0，在 VS2005下测试通过

暂时只支持火车票的查询，可以显示各类坐席的当前余票数量，显示发车时间和到达时间，显示途中耗时。定票功能将在后续完善。