How to read barcode from uploaded file for barcode reader API in C# using PDF.co Web API
How to read barcode from uploaded file for barcode reader API in C#: Step By Step Tutorial
Source code documentation samples provide quick and easy way to add a required functionality into your application. PDF.co Web API was made to help with barcode reader 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.
The SDK samples like this one below explain how to quickly make your application do barcode reader API in C# with the help of PDF.co Web API. Sample code in C# is all you need. Copy-paste it to your the code editor, then add a reference to PDF.co Web API and you are ready to try it! Code testing will allow the function to be tested and work properly with your data.
ByteScout free trial version is available for FREE download from our website. Programming tutorials along with source code samples are included.
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ByteScoutWebApiExample.csproj
<?xml version="1.0" encoding="utf-8"?>
<Project ToolsVersion="12.0" DefaultTargets="Build" xmlns="http://schemas.microsoft.com/developer/msbuild/2003">
<Import Project="$(MSBuildExtensionsPath)\$(MSBuildToolsVersion)\Microsoft.Common.props" Condition="Exists('$(MSBuildExtensionsPath)\$(MSBuildToolsVersion)\Microsoft.Common.props')" />
<PropertyGroup>
<Configuration Condition=" '$(Configuration)' == '' ">Debug</Configuration>
<Platform Condition=" '$(Platform)' == '' ">AnyCPU</Platform>
<ProjectGuid>{1E1C2C34-017E-4605-AE2B-55EA3313BE51}</ProjectGuid>
<OutputType>Exe</OutputType>
<AppDesignerFolder>Properties</AppDesignerFolder>
<RootNamespace>ByteScoutWebApiExample</RootNamespace>
<AssemblyName>ByteScoutWebApiExample</AssemblyName>
<TargetFrameworkVersion>v4.0</TargetFrameworkVersion>
<FileAlignment>512</FileAlignment>
</PropertyGroup>
<PropertyGroup Condition=" '$(Configuration)|$(Platform)' == 'Debug|AnyCPU' ">
<PlatformTarget>AnyCPU</PlatformTarget>
<DebugSymbols>true</DebugSymbols>
<DebugType>full</DebugType>
<Optimize>false</Optimize>
<OutputPath>bin\Debug\</OutputPath>
<DefineConstants>DEBUG;TRACE</DefineConstants>
<ErrorReport>prompt</ErrorReport>
<WarningLevel>4</WarningLevel>
</PropertyGroup>
<PropertyGroup Condition=" '$(Configuration)|$(Platform)' == 'Release|AnyCPU' ">
<PlatformTarget>AnyCPU</PlatformTarget>
<DebugType>pdbonly</DebugType>
<Optimize>true</Optimize>
<OutputPath>bin\Release\</OutputPath>
<DefineConstants>TRACE</DefineConstants>
<ErrorReport>prompt</ErrorReport>
<WarningLevel>4</WarningLevel>
</PropertyGroup>
<ItemGroup>
<Reference Include="Newtonsoft.Json, Version=10.0.0.0, Culture=neutral, PublicKeyToken=30ad4fe6b2a6aeed, processorArchitecture=MSIL">
<HintPath>packages\Newtonsoft.Json.10.0.3\lib\net40\Newtonsoft.Json.dll</HintPath>
<Private>True</Private>
</Reference>
<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" />
<Compile Include="Properties\AssemblyInfo.cs" />
</ItemGroup>
<ItemGroup>
<None Include="packages.config" />
<Content Include="sample.pdf">
<CopyToOutputDirectory>Always</CopyToOutputDirectory>
</Content>
</ItemGroup>
<Import Project="$(MSBuildToolsPath)\Microsoft.CSharp.targets" />
<!-- To modify your build process, add your task inside one of the targets below and uncomment it.
Other similar extension points exist, see Microsoft.Common.targets.
<Target Name="BeforeBuild">
</Target>
<Target Name="AfterBuild">
</Target>
-->
</Project>
ByteScoutWebApiExample.sln
Microsoft Visual Studio Solution File, Format Version 12.00
# Visual Studio 2013
VisualStudioVersion = 12.0.40629.0
MinimumVisualStudioVersion = 10.0.40219.1
Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "ByteScoutWebApiExample", "ByteScoutWebApiExample.csproj", "{1E1C2C34-017E-4605-AE2B-55EA3313BE51}"
EndProject
Global
GlobalSection(SolutionConfigurationPlatforms) = preSolution
Debug|Any CPU = Debug|Any CPU
Release|Any CPU = Release|Any CPU
EndGlobalSection
GlobalSection(ProjectConfigurationPlatforms) = postSolution
{1E1C2C34-017E-4605-AE2B-55EA3313BE51}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
{1E1C2C34-017E-4605-AE2B-55EA3313BE51}.Debug|Any CPU.Build.0 = Debug|Any CPU
{1E1C2C34-017E-4605-AE2B-55EA3313BE51}.Release|Any CPU.ActiveCfg = Release|Any CPU
{1E1C2C34-017E-4605-AE2B-55EA3313BE51}.Release|Any CPU.Build.0 = Release|Any CPU
EndGlobalSection
GlobalSection(SolutionProperties) = preSolution
HideSolutionNode = FALSE
EndGlobalSection
EndGlobal
Program.cs
using System;
using System.Collections.Generic;
using System.IO;
using System.Net;
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 file name
const string SourceFile = @".\sample.pdf";
// Comma-separated list of barcode types to search.
// See the documentation: https://apidocs.pdf.co/?#barcode-reader
const string BarcodeTypes = "Code128,Code39,Interleaved2of5,EAN13";
// Comma-separated list of page indices (or ranges) to process. Leave empty for all pages. Example: '0,2-5,7-'.
const string Pages = "";
static void Main(string[] args)
{
// Create standard .NET web client instance
WebClient webClient = new WebClient();
// Set API Key
webClient.Headers.Add("x-api-key", API_KEY);
// Upload file to the cloud
string uploadedFileUrl = UploadFile(SourceFile);
if (string.IsNullOrEmpty(uploadedFileUrl))
{
Console.WriteLine("File upload error.");
return;
}
// READ BARCODES FROM UPLOADED FILE
// Prepare requests params as JSON
// See documentation: https://apidocs.pdf.co/?#barcode-reader
Dictionary<string, string> parameters = new Dictionary<string, string>();
parameters.Add("url", uploadedFileUrl);
parameters.Add("type", BarcodeTypes);
parameters.Add("pages", Pages);
// Convert dictionary of params to JSON
string jsonPayload = JsonConvert.SerializeObject(parameters);
try
{
// URL of "Barcode Reader" endpoint
string url = "https://api.pdf.co/v1/barcode/read/from/url";
// Execute POST request with JSON payload
string response = webClient.UploadString(url, jsonPayload);
// Parse JSON response
JObject json = JObject.Parse(response);
if (json["error"].ToObject<bool>() == false)
{
// Display found barcodes in console
foreach (JToken token in json["barcodes"])
{
Console.WriteLine("Found barcode:");
Console.WriteLine(" Type: " + token["TypeName"]);
Console.WriteLine(" Value: " + token["Value"]);
Console.WriteLine(" Document Page Index: " + token["Page"]);
Console.WriteLine(" Rectangle: " + token["Rect"]);
Console.WriteLine(" Confidence: " + token["Confidence"]);
Console.WriteLine();
}
}
else
{
// Display service reported error
Console.WriteLine(json["message"].ToString());
}
}
catch (WebException e)
{
// Display request error
Console.WriteLine(e.ToString());
}
finally
{
webClient.Dispose();
}
Console.WriteLine();
Console.WriteLine("Press any key...");
Console.ReadKey();
}
/// <summary>
/// Uploads file to the cloud and return URL of uploaded file to use in further API calls.
/// </summary>
/// <param name="file">Source file name (path).</param>
/// <returns>URL of uploaded file</returns>
static string UploadFile(string file)
{
// Create standard .NET web client instance
WebClient webClient = new WebClient();
// Set API Key
webClient.Headers.Add("x-api-key", API_KEY);
try
{
// 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(file)));
// 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();
// Get URL of uploaded file to use with later API calls
string uploadedFileUrl = json["url"].ToString();
// 2. UPLOAD THE FILE TO CLOUD.
webClient.Headers.Add("content-type", "application/octet-stream");
webClient.UploadFile(uploadUrl, "PUT", file); // You can use UploadData() instead if your file is in byte[] or Stream
return uploadedFileUrl;
}
else
{
// Display service reported error
Console.WriteLine(json["message"].ToString());
}
}
catch (Exception e)
{
Console.WriteLine(e);
throw;
}
finally
{
webClient.Dispose();
}
return null;
}
}
}
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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See also:
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See also:
printable version:
PDF-co-Web-API-C-sharp-Read-Barcode-From-Uploaded-File.pdf
PDF-co-Web-API-C-sharp-Read-Barcode-From-Uploaded-File.pdf
