Python 打印人类友好的 Protobuf 消息
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Print human friendly Protobuf message
提问by Alexandru Irimiea
I couldn't find anywhere a possibility to print a human friendly content of a Google Protobuf message.
我找不到任何地方可以打印 Google Protobuf 消息的人类友好内容。
Is there an equivalent in Python for Java's toString()or C++'s DebugString()?
Python 中是否有 JavatoString()或 C++的等价物DebugString()？
采纳答案by cdonts
回答by Rafael Lerm
As answered, printand __str__do work, but I wouldn't use them for anything more than debug strings.
正如回答的那样，print并且__str__可以工作，但除了调试字符串之外，我不会将它们用于任何其他用途。
If you're writing to something that users could see, it's better to use the google.protobuf.text_formatmodule, which has some more controls (e.g. escaping UTF8 strings or not), as well as functions for parsing text-format as protobufs.
如果您正在编写用户可以看到的内容，最好使用该google.protobuf.text_format模块，该模块具有更多控件（例如转义 UTF8 字符串或不转义），以及用于将文本格式解析为 protobuf 的函数。
回答by Neil Z. Shao
Here's an example for read/write human friendlytext file using protobuf 2.0in python.
这是在python 中使用的读/写人类友好文本文件的示例。protobuf 2.0
from google.protobuf import text_format
read from a text file
从文本文件中读取
f = open('a.txt', 'r')
address_book = addressbook_pb2.AddressBook() # replace with your own message
text_format.Parse(f.read(), address_book)
f.close()
write to a text file
写入文本文件
f = open('b.txt', 'w')
f.write(text_format.MessageToString(address_book))
f.close()
The c++equivalent is:
在C ++当量是：
bool ReadProtoFromTextFile(const std::string filename, google::protobuf::Message* proto)
{
int fd = _open(filename.c_str(), O_RDONLY);
if (fd == -1)
return false;
google::protobuf::io::FileInputStream* input = new google::protobuf::io::FileInputStream(fd);
bool success = google::protobuf::TextFormat::Parse(input, proto);
delete input;
_close(fd);
return success;
}
bool WriteProtoToTextFile(const google::protobuf::Message& proto, const std::string filename)
{
int fd = _open(filename.c_str(), O_WRONLY | O_CREAT | O_TRUNC, 0644);
if (fd == -1)
return false;
google::protobuf::io::FileOutputStream* output = new google::protobuf::io::FileOutputStream(fd);
bool success = google::protobuf::TextFormat::Print(proto, output);
delete output;
_close(fd);
return success;
}
