java - Protobuf 错误 :Protocol message tag had invalid wire type

Question

我在尝试用 java 读取消息时遇到以下错误

Exception in thread "main" com.google.protobuf.InvalidProtocolBufferException: Protocol message tag had invalid wire type.
    at com.google.protobuf.InvalidProtocolBufferException.invalidWireType(InvalidProtocolBufferException.java:78)
    at com.google.protobuf.UnknownFieldSet$Builder.mergeFieldFrom(UnknownFieldSet.java:498)
    at com.google.protobuf.GeneratedMessage$Builder.parseUnknownField(GeneratedMessage.java:438)

FileInputStream fis = new FileInputStream("F:/Newfolder/sample_message.txt");
Nt nlc = Nt.parseFrom(fis);

if(nlc.hasMessageId())
{
    System.out.println("MessageId: "+nta2sse.getMessageId());
}

我在 if(nlc.hasMessageId()) 处遇到异常

---

这是完整的堆栈跟踪。

Exception in thread "main" com.google.protobuf.InvalidProtocolBufferException: Protocol message tag had invalid wire type.
    at com.google.protobuf.InvalidProtocolBufferException.invalidWireType(InvalidProtocolBufferException.java:78)
    at com.google.protobuf.UnknownFieldSet$Builder.mergeFieldFrom(UnknownFieldSet.java:498)
    at com.google.protobuf.GeneratedMessage$Builder.parseUnknownField(GeneratedMessage.java:438)
    at com.soeasy.aanta.nta.sse.NtaSse$Nta2Sse$Builder.mergeFrom(NtaSse.java:523)
    at com.soeasy.aanta.nta.sse.NtaSse$Nta2Sse$Builder.mergeFrom(NtaSse.java:1)
    at com.google.protobuf.AbstractMessage$Builder.mergeFrom(AbstractMessage.java:1)
    at com.google.protobuf.AbstractMessageLite$Builder.mergeFrom(AbstractMessageLite.java:212)
    at com.google.protobuf.AbstractMessage$Builder.mergeFrom(AbstractMessage.java:746)
    at com.google.protobuf.AbstractMessage$Builder.mergeFrom(AbstractMessage.java:1)
    at com.google.protobuf.AbstractMessageLite$Builder.mergeDelimitedFrom(AbstractMessageLite.java:282)
    at com.google.protobuf.AbstractMessage$Builder.mergeDelimitedFrom(AbstractMessage.java:760)
    at com.google.protobuf.AbstractMessageLite$Builder.mergeDelimitedFrom(AbstractMessageLite.java:288)
    at com.google.protobuf.AbstractMessage$Builder.mergeDelimitedFrom(AbstractMessage.java:752)
    at com.soeasy.aanta.nta.sse.NtaSse$Nta2Sse.parseDelimitedFrom(NtaSse.java:338)
    at com.soeasy.aanta.nta.sse.NtaSseServer.main(NtaSseServer.java:60)

样本 _message.txt 具有以下内容:

message_id: 1
batch_meas_update {
  device_update {
    unique_device_id {
      device_type: ME
      device_id: 161
    }
    meas_update {
      override_status: OVERRIDE_INACTIVE
      bad_data_status: GOOD_DATA
      scada_status: SCADA_ACTIVE
      weight: 1.0
      value: 406.596
    }
  }
}

是按照.proto文件

谢谢

Answer 1

我非常怀疑你在那里得到异常 - 我希望你在 parseFrom 中得到它。您能否发布完整 堆栈跟踪而不只是前三行？

我强烈怀疑您的文件基本上已损坏。您为应该是二进制 文件的内容提供了.txt 扩展名这一事实有点令人怀疑……该文件实际上是什么样子的？您不会像这样使用 parseFrom 来解析 protobuf 消息的 ASCII 表示。

编辑:根据评论中链接的问题，您正在尝试使用为二进制 数据设计的方法来解析文本 文件。

你想使用类似的东西:

// Use the normal try/finally for closing reliably
InputStreamReader reader = new InputStreamReader(fis, "ASCII");

Nt.Builder builder = Nt.newBuilder();
TextFormat.merge(reader, builder);
Nt nt = builder.build();