In protobuf, we can't store null strings so to denote a string that isn't
set we use the empty string. For this reason, the parsing is returning
false to tell you that there isn't a field there but as you're seeing will
still parse as an empty string.
On Wednesday, June 14, 2023 at 1:37:05 AM UTC-7 Krati Chordia wrote:
> Hi,
> I am trying to send a message on wire with the following protobuf structure
>
> message TestMsg {
> string status = 1;
> }
>
> I create an instance of TestMsg and set status as empty and serialize it
> to a string.
>
> TestMsg m1;
> m1.set_status("");
>
> std::string str = m1.SerializeAsString();
>
> Post serialization, str is sent over wire and tried to be parsed.
> ParseFromString returns false whereas it should not. For any other value,
> it parses successfully.
>
> TestMsg m2;
> m2.ParseFromString(str); <----- this returns false
>
> Also, if I try to retrieve the value of m2.status(), it will return an
> empty string even though the parsing returns false.
>
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