（1）根据所给的字符建立出哈夫曼树并由此获得哈夫曼编码，同时将哈夫曼编码存入hfmTree.txt文件中。

（2）利用建立好的哈夫曼编码将所给的文件编码，同时存入CodeFile.txt文件中。

（3）利用哈夫曼树及其编码将文件CodeFile.txt中的密码解码。同时将所需解码的文件以50字为一行输出，并输出解码后的文件。

-(1) According to the character of the establishment of a Huffman tree and thus obtain Huffman coding, while Huffman coding into hfmTree.txt file. (2) the use of well-established Huffman encoding to the given document, while deposit CodeFile.txt file. (3) the use of Huffman coding tree and the password file CodeFile.txt decoding. Required to decode the file while the 50 word line of output, and output decoded file.