How to pass the image converted in bytes to request in detectdocumenttextresult and detectdocumenttextresponse using .Net?

Question

Not able to pass the image which is converted to bytes to request. Due to which i am unable to use detectdocumenttextresult and detectdocumenttextresponse

This is the java code i have tried to convert in c#

string document = "input.png";

ByteBuffer imageBytes;
using (Stream inputStream = new FileStream(document, FileMode.Open, FileAccess.Read)) {
    imageBytes = ByteBuffer.wrap(IOUtils.toByteArray(inputStream));
}
AmazonTextract client = AmazonTextractClientBuilder.defaultClient();

DetectDocumentTextRequest request = (new DetectDocumentTextRequest()).withDocument(new Document()
                    .withBytes(imageBytes));

DetectDocumentTextResult result = client.detectDocumentText(request);

/* this is the c# code i am not able to pass the data to request*/

AmazonTextractClient Atc = new AmazonTextractClient(credentials, config);
Image img = Image.FromFile("D:\\Images\\1.Jpeg");
byte[] ImageBytes = (byte[])(new ImageConverter()).ConvertTo(img, typeof(byte[]));
DetectDocumentTextRequest request = new DetectDocumentTextRequest();
request.Document.Bytes.Read(ImageBytes, 0 , ImageBytes.Length);
DetectDocumentTextResponse res = Atc.DetectDocumentText(request);

You say you're not able to pass the data, are you getting an error message? — Nanhydrin, May 20 '19 at 11:26

score 0 · Accepted Answer · answered May 21 '19 at 15:53

Even though the property says bytes, it wants a raw memory stream. Photo is the file location of your image. Client is your AmazonTextractClient client however you want to instantiate it.

var client = new AmazonTextractClient("[KEY ID]", "[ACCESS KEY]", Amazon.RegionEndpoint.USEast1); 

Document MyDocument;
using (Image image = Image.FromFile(photo))
{
    using (MemoryStream m = new MemoryStream())
    {
        image.Save(m, image.RawFormat);
        MyDocument = new Document()
        {
            Bytes = m
        };
    }
}

Then for DetectDocumentTextRequest()

var request = new DetectDocumentTextRequest()
{
    Document = MyDocument
};

var response = client.DetectDocumentText(request);

AnalyzeDocumentRequest() also works

var DocRequest = new AnalyzeDocumentRequest()
{
    Document = MyDocument,
    FeatureTypes = new List<string> { FeatureType.FORMS, FeatureType.TABLES }
};

var response =  client.AnalyzeDocument(DocRequest);

Thanks:-) can you please tell me how to parse the data from key value pair and table from the analyse document response? — rahul shetty, May 23 '19 at 04:44
You just need to loop through and parse the Blocks property of the response. For each Block there is a BlockType and you can test for Key/Values/Entity Type or a Table or Cells of the table. — JAZ, May 23 '19 at 18:05

How to pass the image converted in bytes to request in detectdocumenttextresult and detectdocumenttextresponse using .Net?

1 Answers1