ByteScout Barcode Reader SDK - ASP.NET VB - Decode page by page from PDF OR TIFF - ByteScout

ByteScout Barcode Reader SDK – ASP.NET VB – Decode page by page from PDF OR TIFF

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How to decode page by page from PDF OR TIFF in ASP.NET VB with ByteScout BarCode Reader SDK

Tutorial on how to decode page by page from PDF OR TIFF in ASP.NET VB

The sample shows steps and algorithm of how to decode page by page from PDF OR TIFF and how to make it work in your ASP.NET VB application. ByteScout BarCode Reader SDK can decode page by page from PDF OR TIFF. It can be used from ASP.NET VB. 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.

This code snippet below for ByteScout BarCode Reader SDK works best when you need to quickly decode page by page from PDF OR TIFF in your ASP.NET VB application. Just copy and paste the code into your ASP.NET VB application’s code and follow the instruction. Further enhancement of the code will make it more vigorous.

Trial version of ByteScout BarCode Reader SDK can be downloaded for free from our website. It also includes source code samples for ASP.NET VB and other programming languages.

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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/TIFF document<br /> <asp:FileUpload ID="FileUpload1" runat="server" /><br /> <br /> Page No. to read barcode from: <asp:TextBox ID="txtPageNo" Text="1" runat="server"></asp:TextBox> <br /> <br /> <asp:Button ID="UploadButton" Text="Upload file and read barcodes" 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. ' ' Changes to this file may cause incorrect behavior and will be lost if ' the code is regenerated. ' </auto-generated> '------------------------------------------------------------------------------ Option Strict On Option Explicit On Partial Public Class _Default '''<summary> '''form1 control. '''</summary> '''<remarks> '''Auto-generated field. '''To modify move field declaration from designer file to code-behind file. '''</remarks> Protected WithEvents 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 WithEvents FileUpload1 As Global.System.Web.UI.WebControls.FileUpload '''<summary> '''txtPageNo control. '''</summary> '''<remarks> '''Auto-generated field. '''To modify move field declaration from designer file to code-behind file. '''</remarks> Protected WithEvents txtPageNo As Global.System.Web.UI.WebControls.TextBox '''<summary> '''UploadButton control. '''</summary> '''<remarks> '''Auto-generated field. '''To modify move field declaration from designer file to code-behind file. '''</remarks> Protected WithEvents 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 WithEvents 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 WithEvents 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) ' Page No to read Dim PageNoToRead As Integer = Convert.ToInt32(txtPageNo.Text) UploadStatusLabel.Visible = False ListBox1.Items.Clear() ListBox1.Visible = True ListBox1.Items.Add("Reading barcode(s) from file """ + fileName + ", Page No:" + PageNoToRead.ToString()) ' Reading barcode from document on page-by-page basic Dim barcodes As FoundBarcode() = barcodeReader.ReadFrom(Server.MapPath(savePath), (PageNoToRead - 1)) 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 - Type: '{0}', Value: '{1}', Position: '{2}'", barcode.Type, barcode.Value, 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> <httpRuntime maxRequestLength="1048576" /> <!-- 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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