How to parse uploaded file for document parser API in C# using PDF.co Web API

Step-by-step tutorial:How to parse uploaded file to have document parser API in C#

Quick guide:Learn how to parse uploaded file in C#. PDF.co Web API was designed to assist document parser API in C#. PDF.co Web API is the flexible Web API that includes full set of functions from e-signature requests to data extraction, OCR, images recognition, pdf splitting and pdf splitting. Can also generate barcodes and read barcodes from images, scans and pdf.

If you want to speed up the application’s code writing then C# code samples for C# developers help to implement using PDF.co Web API. This sample code in C# is all you need. Just copy-paste it to the code editor, then add a reference to PDF.co Web API and you are ready to try it! Enjoy writing a code with ready-to-use sample C# codes to implement document parser API using PDF.co Web API.

PDF.co Web API – free trial version is available on our website. Also, there are other code samples to help you with your C# application included into trial version.

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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: 2 templatePriority: 0 sourceId: Multipage Table Test detectionRules: keywords: - Sample document with multi-page table fields: total: expression: TOTAL {{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

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Program.cs
      
using System; using System.Collections.Generic; using System.Collections.Specialized; using System.IO; using System.Net; using System.Text; using Newtonsoft.Json; using Newtonsoft.Json.Linq; namespace ByteScoutWebApiExample { class Program { // The authentication key (API Key). // Get your own by registering at https://app.pdf.co/documentation/api const String API_KEY = "***********************************"; // Source PDF file const string SourceFile = @".\MultiPageTable.pdf"; // PDF document password. Leave empty for unprotected documents. const string Password = ""; // Destination TXT file name const string DestinationFile = @".\result.json"; 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(); // Set API Key webClient.Headers.Add("x-api-key", API_KEY); // 1. RETRIEVE THE PRESIGNED URL TO UPLOAD THE FILE. // * If you already have a direct file URL, skip to the step 3. // Prepare URL for `Get Presigned URL` API call string query = Uri.EscapeUriString(string.Format( "https://api.pdf.co/v1/file/upload/get-presigned-url?contenttype=application/octet-stream&name={0}", Path.GetFileName(SourceFile))); try { // Execute request string response = webClient.DownloadString(query); // Parse JSON response JObject json = JObject.Parse(response); if (json["error"].ToObject<bool>() == false) { // Get URL to use for the file upload string uploadUrl = json["presignedUrl"].ToString(); string uploadedFileUrl = json["url"].ToString(); // 2. UPLOAD THE FILE TO CLOUD. webClient.Headers.Add("content-type", "application/octet-stream"); webClient.UploadFile(uploadUrl, "PUT", SourceFile); // You can use UploadData() instead if your file is byte[] or Stream webClient.Headers.Remove("content-type"); // 3. PARSE UPLOADED PDF DOCUMENT // URL for `Document Parser` API call query = Uri.EscapeUriString(string.Format( "https://api.pdf.co/v1/pdf/documentparser?url={0}", uploadedFileUrl)); Dictionary<string, string> requestBody = new Dictionary<string, string>(); requestBody.Add("template", templateText); // Execute request response = webClient.UploadString(query, "POST", JsonConvert.SerializeObject(requestBody)); // Parse response json = JObject.Parse(response); if (json["error"].ToObject<bool>() == false) { // Get URL of generated JSON file string resultFileUrl = json["url"].ToString(); // Download JSON file webClient.DownloadFile(resultFileUrl, DestinationFile); Console.WriteLine("Generated JSON file saved as \"{0}\" file.", DestinationFile); } else { Console.WriteLine(json["message"].ToString()); } } else { Console.WriteLine(json["message"].ToString()); } } catch (WebException e) { Console.WriteLine(e.ToString()); } webClient.Dispose(); Console.WriteLine(); Console.WriteLine("Press any key..."); Console.ReadKey(); } } }

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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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