The C++ implementation of protocol buffers returns the byte and string types as std::string. This structure contains a length function telling you how long the corresponding data is (as well as the data itself.) Thus there is no special significance
下载的是github上的:https://github.com/google/protobuf If you get the source from github, you need to generate the configure script first: $ ./autogen.sh This will download gtest source (which is used for C++ Protocol Buffer unit-tests) to the current direc