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base64_encode() std::string BaseExport base64_encode ( unsigned char const *  data, unsigned int  len  ) 对数据进行Base64编码 将给定的数据转换为Base64编码的字符串。 参数 [in] data 指向数据的指针 [in] len 数据的长度 返回 Base64编码后的字符串