utf8到gbk的转码的c++代码，方便易懂。-utf8 to gbk transgenic code c++ code, easy to understand.

对文件中的中文做编码转换，支持目录下所有文件的转换，转换格式为UTF8到GBK。-To document the Chinese to do encoding conversion, support for directory conversion of all documents, conversion to UTF8 format to GBK.

实现文件字符集的转换，可以完成字符集从utf8到国标gbk的转换，方便界面显示一些汉字乱码的修正-The realization of a document character set conversion, you can complete the character set from utf8 to gbk GB conversion, convenient interface shows some garbled characters amendment