ByteScout Barcode Reader SDK - ASP.NET VB - Read Barcodes From PDF - ByteScout

ByteScout Barcode Reader SDK – ASP.NET VB – Read Barcodes From PDF

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How to read barcodes from PDF in ASP.NET VB with ByteScout BarCode Reader SDK

Write code in ASP.NET VB to read barcodes from PDF with this step-by-step tutorial

Source code documentation samples provide quick and easy way to add a required functionality into your application. ByteScout BarCode Reader SDK is the SDK for barcode decoding. Can read all popular types from Code 128, GS1, UPC and Code 39 to QR Code, Datamatrix, PDF417. Images, pdf, TIF images and live web camera are supported as input. Designed to handle documents with noise and defects. Includes optional splitter and merger for pdf and tiff based on barcodes. Batch mode is optimized for high performance with multiple threads. Decoded values can be exported to XML, JSON, CSV or into custom data format. It can read barcodes from PDF in ASP.NET VB.

This code snippet below for ByteScout BarCode Reader SDK works best when you need to quickly read barcodes from PDF in your ASP.NET VB application. In order to implement the functionality, you should copy and paste this code for ASP.NET VB below into your code editor with your app, compile and run your application. Test ASP.NET VB sample code examples whether they respond your needs and requirements for the project.

Free trial version of ByteScout BarCode Reader SDK is available for download from our website. Get it to try other source code samples for ASP.NET VB.

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Default.aspx
      
<%@ Page Language="C#" AutoEventWireup="true" CodeBehind="Default.aspx.cs" Inherits="WebTestSharp._Default" %> <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> <html xmlns="http://www.w3.org/1999/xhtml" > <head runat="server"> <title>Web Barcode Reader Tester (C#)</title> </head> <body> <form id="form1" runat="server"> <div> Click browse button to upload a PDF document<br /> <asp:FileUpload ID="FileUpload1" runat="server" /><br /> <br /> <asp:Button id="UploadButton" Text="Upload file" OnClick="UploadButton_Click" runat="server"> </asp:Button> <br /> <br /> <asp:Label id="UploadStatusLabel" Text="" runat="server"></asp:Label> <br /> <asp:ListBox ID="ListBox1" runat="server" Visible="False"></asp:ListBox><br /> <br /> </div> </form> </body> </html>

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Default.aspx.designer.vb
      
'------------------------------------------------------------------------------ ' <auto-generated> ' This code was generated by a tool. ' Runtime Version:2.0.50727.4927 ' ' Changes to this file may cause incorrect behavior and will be lost if ' the code is regenerated. ' </auto-generated> '------------------------------------------------------------------------------ ''' <summary> ''' _Default class. ''' </summary> ''' <remarks> ''' Auto-generated class. ''' </remarks> Public Partial Class _Default ''' <summary> ''' form1 control. ''' </summary> ''' <remarks> ''' Auto-generated field. ''' To modify move field declaration from designer file to code-behind file. ''' </remarks> Protected form1 As Global.System.Web.UI.HtmlControls.HtmlForm ''' <summary> ''' FileUpload1 control. ''' </summary> ''' <remarks> ''' Auto-generated field. ''' To modify move field declaration from designer file to code-behind file. ''' </remarks> Protected FileUpload1 As Global.System.Web.UI.WebControls.FileUpload ''' <summary> ''' UploadButton control. ''' </summary> ''' <remarks> ''' Auto-generated field. ''' To modify move field declaration from designer file to code-behind file. ''' </remarks> Protected UploadButton As Global.System.Web.UI.WebControls.Button ''' <summary> ''' UploadStatusLabel control. ''' </summary> ''' <remarks> ''' Auto-generated field. ''' To modify move field declaration from designer file to code-behind file. ''' </remarks> Protected UploadStatusLabel As Global.System.Web.UI.WebControls.Label ''' <summary> ''' ListBox1 control. ''' </summary> ''' <remarks> ''' Auto-generated field. ''' To modify move field declaration from designer file to code-behind file. ''' </remarks> Protected ListBox1 As Global.System.Web.UI.WebControls.ListBox End Class

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Default.aspx.vb
      
Imports Bytescout.BarCodeReader Public Partial Class _Default Inherits Web.UI.Page ' IF YOU SEE TEMPORARY FOLDER ACCESS ERRORS: ' Temporary folder access is required for web application when you use ByteScout SDK in it. ' If you are getting errors related to the access to temporary folder like "Access to the path 'C:\Windows\TEMP\... is denied" then you need to add permission for this temporary folder to make ByteScout SDK working on that machine and IIS configuration because ByteScout SDK requires access to temp folder to cache some of its data for more efficient work. ' SOLUTION: ' If your IIS Application Pool has "Load User Profile" option enabled the IIS provides access to user's temp folder. Check user's temporary folder ' If you are running Web Application under an impersonated account or IIS_IUSRS group, IIS may redirect all requests into separate temp folder like "c:\temp\". ' In this case ' - check the User or User Group your web application is running under ' - then add permissions for this User or User Group to read and write into that temp folder (c:\temp or c:\windows\temp\ folder) ' - restart your web application and try again Protected Sub UploadButton_Click(ByVal sender As Object, ByVal e As EventArgs) Dim savePath As String = "\uploads\" If FileUpload1.HasFile Then Dim fileName As [String] = FileUpload1.FileName savePath += fileName FileUpload1.SaveAs(Server.MapPath(savePath)) Dim barcodeReader As New Reader() ' Limit search to 1D barcodes only (exclude 2D barcodes to speed up the search). ' Change to barcodeReader.BarcodeTypesToFind.SetAll() to scan for all supported 1D and 2D barcodes ' or select specific type, e.g. barcodeReader.BarcodeTypesToFind.PDF417 = True barcodeReader.BarcodeTypesToFind.SetAll1D() 'reader.MediumTrustLevelCompatible = true ' uncomment this line to enable Medium Trust compatible mode (slows down the recognition process as direct image data access is disabled in Medium Trust mode) UploadStatusLabel.Visible = False ListBox1.Items.Clear() ListBox1.Visible = True ListBox1.Items.Add("Reading barcode(s) from PDF file """ + fileName + """") Dim barcodes As FoundBarcode() = barcodeReader.ReadFrom(Server.MapPath(savePath)) If barcodes.Length = 0 Then ListBox1.Items.Add("No barcodes found") Else For Each barcode As FoundBarcode In barcodes ListBox1.Items.Add(String.Format("Found barcode with type '{0}' and value '{1}' at page {2} at {3}", barcode.Type, barcode.Value, barcode.Page, barcode.Rect.ToString())) Next End If Else ' Notify the user that a file was not uploaded. UploadStatusLabel.Text = "You did not specify a file to upload." End If End Sub End Class

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Web.config
      
<?xml version="1.0"?> <configuration> <appSettings/> <connectionStrings/> <system.web> <!-- Set compilation debug="true" to insert debugging symbols into the compiled page. Because this affects performance, set this value to true only during development. --> <compilation debug="true" targetFramework="4.0"/> <!-- The <authentication> section enables configuration of the security authentication mode used by ASP.NET to identify an incoming user. --> <authentication mode="Windows"/> <!-- The <customErrors> section enables configuration of what to do if/when an unhandled error occurs during the execution of a request. Specifically, it enables developers to configure html error pages to be displayed in place of a error stack trace. <customErrors mode="RemoteOnly" defaultRedirect="GenericErrorPage.htm"> <error statusCode="403" redirect="NoAccess.htm" /> <error statusCode="404" redirect="FileNotFound.htm" /> </customErrors> --> <pages controlRenderingCompatibilityVersion="3.5" clientIDMode="AutoID"/></system.web> </configuration>

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