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代码：
https://github.com/ReneNyffenegger/cpp-base64
指南：https://renenyffenegger.ch/notes/development/Base64/Encoding-and-decoding-base-64-with-cpp/
实操：
代码：
https://github.com/ReneNyffenegger/cpp-base64
指南：https://renenyffenegger.ch/notes/development/Base64/Encoding-and-decoding-base-64-with-cpp/
实操：