首页set(GOOGLE_PROTOBUF_DIR ${PROJECT_SOURCE_DIR}/protobuf)

set(GOOGLE_PROTOBUF_DIR ${PROJECT_SOURCE_DIR}/protobuf)

时间: 2023-12-18 14:02:40 浏览: 129

google protobuf 源码

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Protocol Buffers What is it? Protocol Buffers are a way of encoding structured data in an efficient yet extensible format. Google uses Protocol Buffers for almost all of its internal RPC protocols and file formats. Latest Updates http://protobuf.googlecode.com/svn/trunk/CHANGES.txt Documentation Read the documentation. Discussion Visit the discussion group. Quick Example You write a .proto file like this: message Person { required int32 id = 1; required string name = 2; optional string email = 3; } Then you compile it with protoc, the protocol buffer compiler, to produce code in C++, Java, or Python. Then, if you are using C++, you use that code like this: Person person; person.set_id(123); person.set_name("Bob"); person.set_email("bob@example.com"); fstream out("person.pb", ios::out | ios::binary | ios::trunc); person.SerializeToOstream(&out); out.close(); Or like this: Person person; fstream in("person.pb", ios::in | ios::binary); if (!person.ParseFromIstream(&in)) { cerr << "Failed to parse person.pb." << endl; exit(1); } cout << "ID: " << person.id() << endl; cout << "name: " << person.name() << endl; if (person.has_email()) { cout << "e-mail: " << person.email() << endl; } For a more complete example, see the tutorials. v2.3.0 http://code.google.com/p/protobuf/ sample command: protoc.exe -I=.\ --cpp_out=.\ unittest.proto

这段代码是设置变量 `GOOGLE_PROTOBUF_DIR` 的值为 `${PROJECT_SOURCE_DIR}/protobuf`，其中 `${PROJECT_SOURCE_DIR}` 是 CMake 中的一个内置变量，表示当前 CMakeLists.txt 所在的目录。这段代码的作用可能是为了指定 Google Protocol Buffers 库的安装路径或源码路径。

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