Here are a few English Q&A questions that can be used as titles: * Why am I getting the \'missing method protoreflect\' error when importing proto files from different packages in Go? * How do I fix the \'missing method protoref

Unable to import proto files in different packages, resulting in "missing method protoreflect"

You may encounter this when importing proto files in different packages in Go programming "Method protoreflect is missing" error. The following analyzes the reasons and solutions for this error:

Cause of the problem

When you move the proto file to a separate package (such as "prototemps") and try to use it in another This error may occur when importing the proto file in a package (e.g. "reader"). This is because the proto reflection package (containing the protoreflect.ProtoMessage interface) is located in the "github.com/golang/protobuf/proto" or "google.golang.org/protobuf/proto" package, which you may use when importing the proto file It's another bag.

Workaround

To resolve this error you need to make sure you are using the correct package when importing the proto file. There are two options:

1. Use "github.com/golang/protobuf/proto" package:

   This works for older versions protoc-gen-go tool (usually before Go 1.11). Use the following import statements in your package:

   <code class="go">import "github.com/golang/protobuf/proto"</code>

2. Use the "google.golang.org/protobuf/proto" package:

   This works with newer versions of the protoc-gen-go tool (usually in Go 1.12 and above). Use the following import statements in your package:

   <code class="go">import "google.golang.org/protobuf/proto"</code>

Sample code:

Taking uw0uh's sample code as an example, you can Resolve the "missing method protoreflect" error by adding the following import statement to the "reader" package:

<code class="go">import "github.com/golang/protobuf/proto"</code>

This will ensure that you are using the correct proto reflection package and can use proto.Unmarshal successfully () function.

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