iconv 字符集编码转换主模块的实现，常用于 GB2312 与 UTF-8 之间的转换。-iconv character set encoding to achieve the main module, commonly used in the GB2312 and UTF-8 conversion between.

按一定规则读取文件内容，并输出；这是把flex文件转换成C编码，可在C/C++文件中直接调用-Read the contents of the file according to certain rules, and outputs This is the flex file into C code can be C/C++ files directly call