In your C struct example, you know the type "T" that has "int v" as a
member.
If you know that, you can do the same thing with protobuf:
// foo.proto
message T {
optional int32 v = 1;
}
// main.cc
T a;
a.set_v(5);
a.SerializeToString(&str);
T b;
b.ParseFromString(str);
On Thursday, January 4, 2018 at 11:36:06 PM UTC-8, 陆林 wrote:
>
> auto proto_des =
> google::protobuf::DescriptorPool::generated_pool()->FindMessageTypeByName(typeName);
> auto proto_type =
> google::protobuf::MessageFactory::generated_factory()->GetPrototype(descriptor);
> auto protobuf_message = type->New();
> protobuf_message->ParseFromArray(buf, len);
>
> when we know "typeName",
> we can get protobuf_message from an knowned length buf.
>
> if we dont know "typeName", but we know this length of buf is of couse a
> protobuf message!!!
> can we unserialize this buf to an protobuf message instance??
>
> just like c struct:
> struct T
> {
> int v;
> };
> T a;
> a.v = 5;
> char buf[128] = {0};
> memcpy(buf, &a, sizeof(T));
>
> T b;
> memcpy(&b, buf, sizeof(T));
> /////
> we can get b.v = 5;
>
> can protobuf just act like this??
>
>
>
>
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