How to read Json response into Document object of Document AI in C#

Question

I am trying to read json file from cloud storage and trying to convert that into Google.Cloud.DocumentAI.V1.Document.

I have done POC, but its throwing exception Google.Protobuf.InvalidProtocolBufferException: 'Protocol message end-group tag did not match expected tag.'

First I am reading .Json file into MemoryStream and trying to Merge in to Document.

  using Google.Cloud.DocumentAI.V1;

  public static void StreamToDocument()
    {
        byte[] fileContents = File.ReadAllBytes("C:\\upload\\temp.json");
        
        using (Stream memoryStream = new MemoryStream(fileContents))
        {
            Document doc = new Document();
            var byteArray = memoryStream;
            doc.MergeFrom(byteArray);
        }           
    }

Error Message I am getting is

Is there any other way I can achieve this ?

Does your JSON file follow this structure? cloud.google.com/document-ai/docs/reference/rest/v1/Document — Ricco D
– Ricco D, Commented May 3, 2022 at 0:29
yes, json structure as per Document type. This Json is DocumentAI output json. — tt0206
– tt0206, Commented May 3, 2022 at 2:24
Can you provide a sample JSON that could reproduce the issue? Just so the community can easily test this out. — Ricco D
– Ricco D, Commented May 3, 2022 at 5:25

Jon Skeet · Accepted Answer · 2022-05-03 08:06:23Z

4

The code that you've specified there expects the data to be binary protobuf content. For JSON, you want:

string json = File.ReadAllText("C:\\upload\\temp.json");
Document document = Document.Parser.ParseJson(json);

answered May 3, 2022 at 8:06

Jon Skeet

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2 Comments

tt0206 Over a year ago

we have done it something like this. var txtOut = File.ReadAllText(rawJson); JsonParser.Settings settings = new JsonParser.Settings(10); Google.Protobuf.JsonParser parser = new JsonParser(settings); var d1 = parser.Parse<Document>(txtOut);

Jon Skeet Over a year ago

@tt0206: Yes, that'll be fine too (although I wouldn't expect the default recursion limit of 100 to actually cause a problem).

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