ByteScout Cloud API Server – Document Parser API – C# – Parse From URL Asynchronously

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ByteScoutWebApiExample.csproj

      
<?xml version="1.0" encoding="utf-8"?>
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    <ProjectGuid>{1E1C2C34-017E-4605-AE2B-55EA3313BE51}</ProjectGuid>
    <OutputType>Exe</OutputType>
    <RootNamespace>ByteScoutWebApiExample</RootNamespace>
    <AssemblyName>ByteScoutWebApiExample</AssemblyName>
    <TargetFrameworkVersion>v4.0</TargetFrameworkVersion>
    <FileAlignment>512</FileAlignment>
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  </PropertyGroup>
  <ItemGroup>
    <Reference Include="Newtonsoft.Json, Version=10.0.0.0, Culture=neutral, PublicKeyToken=30ad4fe6b2a6aeed, processorArchitecture=MSIL">
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    <Reference Include="System" />
    <Reference Include="System.Core" />
    <Reference Include="System.Xml.Linq" />
    <Reference Include="System.Data" />
    <Reference Include="System.Xml" />
  </ItemGroup>
  <ItemGroup>
    <Compile Include="Program.cs" />
  </ItemGroup>
  <ItemGroup>
    <None Include="MultiPageTable-template1.yml">
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       Other similar extension points exist, see Microsoft.Common.targets.
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ByteScoutWebApiExample.sln

      

Microsoft Visual Studio Solution File, Format Version 12.00
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MinimumVisualStudioVersion = 10.0.40219.1
Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "ByteScoutWebApiExample", "ByteScoutWebApiExample.csproj", "{1E1C2C34-017E-4605-AE2B-55EA3313BE51}"
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Global
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MultiPageTable-template1.yml

      
---
# Template that demonstrates parsing of multi-page table using only 
# regular expressions for the table start, end, and rows.
# If regular expression cannot be written for every table row (for example, 
# if the table contains empty cells), try the second method demonstrated 
# in `MultiPageTable-template2.yml` template.
templateVersion: 3
templatePriority: 0
sourceId: Multipage Table Test
detectionRules:
  keywords:
  - Sample document with multi-page table
fields:
  total:
    type: regex
    expression: TOTAL {{DECIMAL}}
    dataType: decimal
tables:
- name: table1
  start:
    # regular expression to find the table start in document
    expression: Item\s+Description\s+Price\s+Qty\s+Extended Price
  end:
    # regular expression to find the table end in document
    expression: TOTAL\s+\d+\.\d\d
  row:
    # regular expression to find table rows
    expression: '^\s*(?<itemNo>\d+)\s+(?<description>.+?)\s+(?<price>\d+\.\d\d)\s+(?<qty>\d+)\s+(?<extPrice>\d+\.\d\d)'
  columns: 
  - name: itemNo
    type: integer
  - name: description
    type: string
  - name: price
    type: decimal
  - name: qty
    type: integer
  - name: extPrice
    type: decimal
  multipage: true
    

Program.cs

      
using System;
using System.Collections.Generic;
using System.IO;
using System.Net;
using System.Text;
using System.Threading;
using Newtonsoft.Json;
using Newtonsoft.Json.Linq;

// Please NOTE: In this sample we're assuming Cloud Api Server is hosted at "https://localhost". 
// If it's not then please replace this with with your hosting url.

// Cloud API asynchronous "Document Parser" job example.
// Allows to avoid timeout errors when processing huge or scanned PDF documents.

namespace ByteScoutWebApiExample
{
    class Program
    {
        // Source PDF file
        const string SourceFileUrl = "https://bytescout-com.s3.amazonaws.com/files/demo-files/cloud-api/document-parser/MultiPageTable.pdf";

        // Destination TXT file name
        const string DestinationFile = @".\result.json";

        // (!) Make asynchronous job
        const bool Async = true;


        static void Main(string[] args)
        {
            // Template text. Use Document Parser SDK (https://bytescout.com/products/developer/documentparsersdk/index.html)
            // to create templates.
            // Read template from file:
            String templateText = File.ReadAllText(@".\MultiPageTable-template1.yml");

            // Create standard .NET web client instance
            WebClient webClient = new WebClient();

            try
            {
                // PARSE UPLOADED PDF DOCUMENT

                // URL for `Document Parser` API call
                string query = Uri.EscapeUriString(string.Format(
                    "https://localhost/pdf/documentparser?url={0}&async={1}",
                    SourceFileUrl,
                    Async));

                Dictionary<string, string> requestBody = new Dictionary<string, string>();
                requestBody.Add("template", templateText);

                // Execute request
                string response = webClient.UploadString(query, "POST", JsonConvert.SerializeObject(requestBody));

                // Parse response
                JObject json = JObject.Parse(response);

                if (json["error"].ToObject<bool>() == false)
                {
                    // Asynchronous job ID
                    string jobId = json["jobId"].ToString();
                    // Get URL of generated JSON file
                    string resultFileUrl = json["url"].ToString();

                    // Check the job status in a loop. 
                    // If you don't want to pause the main thread you can rework the code 
                    // to use a separate thread for the status checking and completion.
                    do
                    {
                        string status = CheckJobStatus(webClient, jobId); // Possible statuses: "working", "failed", "aborted", "success".

                        // Display timestamp and status (for demo purposes)
                        Console.WriteLine(DateTime.Now.ToLongTimeString() + ": " + status);

                        if (status == "success")
                        {
                            // Download JSON file
                            webClient.DownloadFile(resultFileUrl, DestinationFile);

                            Console.WriteLine("Generated JSON file saved as \"{0}\" file.", DestinationFile);
                            break;
                        }
                        else if (status == "working")
                        {
                            // Pause for a few seconds
                            Thread.Sleep(3000);
                        }
                        else 
                        {
                            Console.WriteLine(status);
                            break;
                        }
                    }
                    while (true);
                }
                else
                {
                    Console.WriteLine(json["message"].ToString());
                }
            }
            catch (WebException e)
            {
                Console.WriteLine(e.ToString());
            }

            webClient.Dispose();

            Console.WriteLine();
            Console.WriteLine("Press any key...");
            Console.ReadKey();
        }

        static string CheckJobStatus(WebClient webClient, string jobId)
        {
            string url = "https://localhost/job/check?jobid=" + jobId;

            string response = webClient.DownloadString(url);
            JObject json = JObject.Parse(response);

            return Convert.ToString(json["status"]);
        }
    }
}

    

packages.config

      
<?xml version="1.0" encoding="utf-8"?>
<packages>
  <package id="Newtonsoft.Json" version="10.0.3" targetFramework="net40" />
</packages>
    

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