You might be slightly confused regarding the workflow here. the .proto file that you pass as an argument to your test.py program does not belong there. This file is the protocol buffer specification that you pass to the protocol buffer compiler in order for it to generate the file addressbook_pb2.py This is described in the section "Compiling your Protocol Buffers".
Then if you notice you import that file in your python program therefore giving it the ability to understand how to operate on the types of messages you are describing in the .proto file. Now that file will be an addressbook. if you don't have one already (you probably don't) you need to create one via running the add_person.py program this program accepts an argument of an addressbook file to add a person and if that file is non existent it will create a new one (your case) so run python add_person.py abfile add the desired values and then you'll have a new file named abfile in that directory. that is what you have to pass as an argument to your test.py On Wednesday, October 26, 2016 at 2:21:40 PM UTC-6, Junhao Wen wrote: > > Hello, I followed the official tutorial for python, > https://developers.google.com/protocol-buffers/docs/pythontutorial > I run protoc 3.1.0 in my Mac, and in the tutorial, in the section of > >> Writing A Message >> >> Now let's try using your protocol buffer classes. The first thing you >> want your address book application to be able to do is write personal >> details to your address book file. To do this, you need to create and >> populate instances of your protocol buffer classes and then write them to >> an output stream. >> >> Here is a program which reads an AddressBook from a file, adds one new >> Person to it based on user input, and writes the new AddressBook back >> out to the file again. The parts which directly call or reference code >> generated by the protocol compiler are highlighted. >> > > What i understood here for the red line is that It refers the > addressbook.proto, I use the tutorial code and run it in terminal with this > command: > > python test.py addressbook.proto > > test.py contains the tutorial code, but i always got the error cause by > this line, address_book.ParseFromString(f.read()) > > Here is the error: > >> Traceback (most recent call last): >> >> File "test.py", line 56, in <module> >> >> address_book.ParseFromString(f.read()) >> >> File >>> "/Users/junhao.wen/anaconda2/lib/python2.7/site-packages/protobuf-3.1.0-py2.7.egg/google/protobuf/message.py", >>> >>> line 185, in ParseFromString >> >> self.MergeFromString(serialized) >> >> File >>> "/Users/junhao.wen/anaconda2/lib/python2.7/site-packages/protobuf-3.1.0-py2.7.egg/google/protobuf/internal/python_message.py", >>> >>> line 1087, in MergeFromString >> >> if self._InternalParse(serialized, 0, length) != length: >> >> File >>> "/Users/junhao.wen/anaconda2/lib/python2.7/site-packages/protobuf-3.1.0-py2.7.egg/google/protobuf/internal/python_message.py", >>> >>> line 1113, in InternalParse >> >> new_pos = local_SkipField(buffer, new_pos, end, tag_bytes) >> >> File >>> "/Users/junhao.wen/anaconda2/lib/python2.7/site-packages/protobuf-3.1.0-py2.7.egg/google/protobuf/internal/decoder.py", >>> >>> line 850, in SkipField >> >> return WIRETYPE_TO_SKIPPER[wire_type](buffer, pos, end) >> >> File >>> "/Users/junhao.wen/anaconda2/lib/python2.7/site-packages/protobuf-3.1.0-py2.7.egg/google/protobuf/internal/decoder.py", >>> >>> line 799, in _SkipGroup >> >> new_pos = SkipField(buffer, pos, end, tag_bytes) >> >> File >>> "/Users/junhao.wen/anaconda2/lib/python2.7/site-packages/protobuf-3.1.0-py2.7.egg/google/protobuf/internal/decoder.py", >>> >>> line 850, in SkipField >> >> return WIRETYPE_TO_SKIPPER[wire_type](buffer, pos, end) >> >> File >>> "/Users/junhao.wen/anaconda2/lib/python2.7/site-packages/protobuf-3.1.0-py2.7.egg/google/protobuf/internal/decoder.py", >>> >>> line 820, in _RaiseInvalidWireType >> >> raise _DecodeError('Tag had invalid wire type.') >> >> google.protobuf.message.DecodeError: Tag had invalid wire type. >> >> >> > Can anybody help me???? > > Thanks in advance > > > -- You received this message because you are subscribed to the Google Groups "Protocol Buffers" group. To unsubscribe from this group and stop receiving emails from it, send an email to protobuf+unsubscr...@googlegroups.com. To post to this group, send email to protobuf@googlegroups.com. Visit this group at https://groups.google.com/group/protobuf. For more options, visit https://groups.google.com/d/optout.
