读取协议缓冲区中枚举扩展的值 [英] Read value of enum extension in protocol buffer
问题描述
我刚刚询问此问题,并决定为枚举值写入扩展名在我的协议缓冲区。然而,我有一个非常困难的时间实际读取的值,即使有这个简单的.proto文件:
I just asked this question and have resolved to write an extension for enum values in my protocol buffer. However I am having an extremely difficult time actually reading the values back, even with this simple .proto file:
package test;
import "google/protobuf/descriptor.proto";
extend google.protobuf.EnumValueOptions {
optional string abbr = 54321;
}
message Person {
required string name = 1;
required int32 id = 2;
optional string email = 3;
enum PhoneType { MOBILE = 0 [(abbr)="Mobile ph"]; HOME = 1 [(abbr)="HomePhone"]; WORK = 2 [(abbr)="Work number"]; }
message PhoneNumber {
required string number = 1;
optional PhoneType type = 2 [default = HOME];
}
repeated PhoneNumber phone = 4;
}
message AddressBook {
repeated Person person = 1;
}
我一直在尝试这些和其他变体:
I've been trying these and other variants:
test::Person::PhoneNumber::descriptor()->options().GetExtension(test::abbr);
test::Person::PhoneNumber::descriptor().GetExtension(test::abbr);
test::Person::descriptor()->options().GetExtension(test::abbr);
const google::protobuf::Descriptor* message = test::Person::PhoneNumber::descriptor();
const google::protobuf::Descriptor* desc = phone2.descriptor();
desc->options().GetExtension(test::abbr); //D.N.E.
google::protobuf::MessageOptions opts = message->options();
opts.GetExtension(test::abbr);
const google::protobuf::EnumDescriptor* enm = message->FindEnumTypeByName("PhoneNumber"); // null, not found
google::protobuf::EnumValueOptions opts2 = enm->value(1)->options();
opts2.GetExtension(test::abbr);
test::Person::PhoneNumber::descriptor()->options().GetExtension(test::abbr);
上述任何一项工作 - 方法不存在或者没有匹配的调用到该函数签名。我已经经历了几个小时的文档无济于事。我知道这应该是可能的,但唯一的例子是写.proto文件,而不是从他们回来 - 我该怎么做?一个简短的例子将被极大地赞赏。先感谢。
None of the above work - either the method does not exist at all, or there is no matching call to that function signature. I've been going through the documentation for hours to no avail. I know it should be possible, but the only examples are of writing the .proto files, not reading back from them -- How do I do this? A short example would be immensely appreciated. Thanks in advance.
推荐答案
这是一个有点复杂,但你需要获得 EnumValueDescriptor
电话类型,然后在此上调用 options()。GetExtension(test :: abbr)
。
It's a wee bit convoluted, but you need to get the EnumValueDescriptor
for the phone type, and then call options().GetExtension(test::abbr)
on this.
:
test::Person person;
person.set_name("Caol Ila");
person.set_id(1);
test::Person::PhoneNumber *phone = person.add_phone();
phone->set_number("01496 840207");
phone->set_type(test::Person::MOBILE);
phone = person.add_phone();
phone->set_number("01496 840207");
phone->set_type(test::Person::HOME);
phone = person.add_phone();
phone->set_number("01496 840207");
phone->set_type(test::Person::WORK);
phone = person.add_phone();
phone->set_number("01496 840207");
const google::protobuf::EnumDescriptor* enum_desc =
test::Person::PhoneType_descriptor();
std::string value;
for (int phone_index = 0; phone_index < person.phone_size(); ++phone_index) {
if (person.phone(phone_index).has_type()) {
int phone_type = person.phone(phone_index).type();
value = enum_desc->value(phone_type)->options().GetExtension(test::abbr);
}
}
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