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gis系统开发公司的笔试题目，俩道简单的编程题目，要求用C++实现(gis system development company written questions, both simple programming channel topic requires C++ achieve)

该系统应具有以下功能： （1） I：初始化（Initialization）。从终端读入字符集大小n，以及n个字符和n个权值，建立哈夫曼树，并将它存于文件hfmTree中。 （2） E：编码（Encoding）。利用已建好的哈夫曼树（如不在内存，则从文件hfmTree中读入），对文件ToBeTran中的正文进行编码，然后将结果存入文件CodeFile中。 （3） D：译码（Decoding）。利用已建好的哈夫曼树将文件CodeFile中的代码进行译码，结果存入文件TextFile中。 （4） P：打印代码文件（Print）。将文件CodeFile以紧凑格式显示在终端上，每行50个代码。同时将此字符形式的编码文件写入文件CodePrin中。 （5） T：打印哈夫曼树（Tree printing）。将已在 中的哈夫曼树以直观的方式（树或凹入表形式）显示在终端上，同时将此字符形式的哈夫曼树写入文件TreePrint中。 (The system should have the following features: (1) I: initialization (Initialization). Read from the terminal character set size n, and n and n characters right value, establishes a Huffman tree, and save it in the file hfmTree in. (2) E: encoding (Encoding). Has been built using the Huffman tree (if not in memory, reads from the file hfmTree), the text of the document ToBeTran encoded, and then putting the result in the CodeFile file. (3) D: decoding (Decoding). Huffman tree has been built using the file CodeFile the code will be decoded, the result is stored in the file TextFile. (4) P: Printing code files (Print). CodeFile in a compact format the document displayed on the terminal, one per line 50 code. While this character in the form of written documents CodePrin encoded file in. (5) T: Print Huffman tree (Tree printing). Would have been in the Huffman tree in an intuitive way (tree or recessed table form) displayed on the terminal, but this form of characters written to the file )

多线程串口类及其使用方法，包含完整的CSerialPort类及其使用方法。(A communication class for serial port)

用VC++6.0编写的USB通讯测试的程序，可以实现查找PC的USB外设，读取USB外设的设备描述符等功能。对USB通讯初学者有很大的帮助。(Written in VC++6.0 using USB communications test procedure, can be achieved to find PC' s USB peripherals, read the USB peripheral device descriptor functions. USB communication to the very helpful for beginners. )

一个类似于vc的界面源码,让vc界面开发变得简单多了.(Vc interface similar to the one source, so that vc interface development becomes much simpler.)

DUIlib编程总结及源码，有一定的参考意义(DUIlib program summary and source, there is some reference value)

因为TWAIN的协议比较复杂,该程序,为你展示了TWAIN的使用(because the agreement is more complicated, the procedures for the display you use the TWAIN)

DSP外部中断及模拟IO完整代码，对于初学者来说还不错，（程序尚没有测试过）(DSP external interrupt and analog IO complete code)

个人理财系统是我用MFC做的一个有界面的程序，里面涉及了数据库编程，常用的控件等知识。里面的数据都存储在SQL Server2005里面，我用的是ado方式访问数据库，实现了记录日常每餐的消费食物，消费水平，并可以自动算出一段时间的消费金额。(Personal financial management system is an interface program I do with MFC, which involves a database programming, controls and other knowledge. Inside the data stored in SQL Server 2005 which I use ado to access the database, to record daily meal consumption of food, consumption levels, and can automatically calculate the amount of the consumer for a period of time.)

基于VC6.0平台编写的一个图形化界面平闰年识别器，界面精美，值得VC初学者参考！(Flat leap year recognition)