报错
[libprotobuf ERROR e:\patch\protobuf-2.5.0\src\google\protobuf\wire_format.cc:10
53] String field contains invalid UTF-8 data when serializing a protocol buffer.
Use the 'bytes' type if you intend to send raw bytes.
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解决方法：在赋值给probuf的前先把char*转化成string
