问题
If a C++ program receives a Protocol Buffers message that has a Protocol Buffers string field, which is represented by a std::string, what is the encoding of text in that field? Is it UTF-8?
回答1:
Protobuf strings are always valid UTF-8 strings.
See the Language Guide:
A string must always contain UTF-8 encoded or 7-bit ASCII text.
(And ASCII is always also valid UTF-8.)
Not all protobuf implementations enforce this, but if I recall correctly, at least the Python library refuses to decode non-unicode strings.
来源：https://stackoverflow.com/questions/52384082/text-encoding-of-protocol-buffers-string-fields