On Sun, Feb 28, 2010 at 3:47 AM, adamdms <adam.kwintkiew...@gmail.com>wrote:
> I created (from tutorial example) below message.
>
> Person ID: 1
> Name: Adam
> E-mail address: adam...@tlen.pl
> Home phone #: 12345
> Mobile phone #: 9999
> Person ID: 2
> Name: Honorata
> E-mail address: hon...@wp.pl
> Work phone #: 44444
> Home phone #: 22222
> Person ID: 3
> Name: Przemek
> E-mail address: przemek©...@tlen.pl
> Home phone #: 555555
>
> It was encoded as:
> 0A 2E 0A 04 41 64 61 6D 10 01 1A 0F 61 64 61 6D 64 6D 73 40 74 6C 65
> 6E 2E 70 6C 22 09 0A 05 31 32 33 34 35 10 01 22 08 0A 04 39 39 39 39
> 10 00 0A 30 0A 08 48 6F 6E 6F 72 61 74 61 10 02 1A 0C 68 6F 6E 63 69
> 6B 40 77 70 2E 70 6C 22 09 0A 05 34 34 34 34 34 10 02 22 09 0A 05 32
> 32 32 32 32 10 01 0A 2D 0A 07 50 72 7A 65 6D 65 6B 10 03 1A 14 70 72
> 7A 65 6D 65 6B C2 A9 63 6F 73 40 74 6C 65 6E 2E 70 6C 22 0A 0A 06 35
> 35 35 35 35 35 10 01
>
> I don't understand that encoding!
> 0A - 0|000 1010 - wire type 0 (variant); field number 1 (but in .proto
> field "Person ID" has number 2)
>
This is field number 1, wire type 2 (length-delimited).
Remember that the thing you are encoding is an AddressBook, not a Person.
message AddressBook {
repeated Person person = 1;
}
So the first byte is the tag for a person in the AddressBook.
> 2E - 0|010 1110 - 46 (but first person has ID = 1)
>
This is the length of the Person message.
> 0A - 0|000 1010 - wire type 0 (variant, but that field is string, it
> should be type = 2); field number 1 (it is ok)
>
Now we're actually in the Person, so this is the "name" field. Note that
fields are ordered by field number, so "name" always comes *before* "id".
> 04 - length is ok
> 41 - "A"
> 64 - "d"
> 61 - "a"
> 6D - "m"
> ...
>
> Can someone explain this to me?
>
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