PDF document can store barcode in raster form in image-resource of PDF document. Also PDF document can store barcode in vector form in vector content of PDF document.
Private Shared Sub ReadBarcodesFromPdfDocument(fileName As String, barcodeType As BarcodeType)
' create the PdfImageViewer object and open PDF document
Using pdfImageViewer As New PdfImageViewer(fileName)
' create the barcode reader
Using reader As New BarcodeReader()
' set barcode reader settings
reader.Settings.ScanBarcodeTypes = barcodeType
' for each page of PDF document
For i As Integer = 0 To pdfImageViewer.PageCount - 1
' get names of all image resources of page i
Dim imageNames As String() = pdfImageViewer.GetImageNames(i)
' for each image resource of page i
For k As Integer = 0 To imageNames.Length - 1
Console.WriteLine(String.Format("Page {0}, image {1}: ", i, imageNames(k)))
Dim barcodeImage As Image
' get image of image resource
Try
barcodeImage = pdfImageViewer.GetImage(i, imageNames(k))
Catch e As Exception
' not supported image format
Console.WriteLine(e.Message)
Continue For
End Try
' read barcodes from image
Dim barcodesInfo As IBarcodeInfo() = reader.ReadBarcodes(barcodeImage)
' free image resource
barcodeImage.Dispose()
' output information about barcodes
If barcodesInfo.Length = 0 Then
Console.WriteLine("No barcodes found.")
Else
For j As Integer = 0 To barcodesInfo.Length - 1
Console.WriteLine(String.Format("[{0}] {1}", barcodesInfo(j).BarcodeType, barcodesInfo(j).Value))
Next
End If
Next
Next
End Using
End Using
End Sub
// The project, which uses this code, must have references to the following assemblies:
// - Vintasoft.Barcode
/// <summary>
/// Reads barcodes from image-resources of PDF document.
/// </summary>
/// <param name="fileName">A path to a PDF document.</param>
/// <param name="barcodeTypes">The types of barcodes, which must be recognized.</param>
static void ReadBarcodesFromPdfDocument(string fileName, Vintasoft.Barcode.BarcodeType barcodeTypes)
{
// create the PdfImageViewer object and open PDF document
using (Vintasoft.Barcode.PdfImageViewer pdfImageViewer = new Vintasoft.Barcode.PdfImageViewer(fileName))
{
// create the barcode reader
using (Vintasoft.Barcode.BarcodeReader reader = new Vintasoft.Barcode.BarcodeReader())
{
// set barcode reader settings
reader.Settings.ScanBarcodeTypes = barcodeTypes;
// for each page of PDF document
for (int i = 0; i < pdfImageViewer.PageCount; i++)
{
// get names of all image resources of page i
string[] imageNames = pdfImageViewer.GetImageNames(i);
// for each image resource of page i
for (int k = 0; k < imageNames.Length; k++)
{
System.Console.WriteLine(string.Format("Page {0}, image {1}: ", i, imageNames[k]));
System.Drawing.Image barcodeImage;
// get image of image resource
try
{
barcodeImage = pdfImageViewer.GetImage(i, imageNames[k]);
}
catch (System.Exception ex)
{
// not supported image format
System.Console.WriteLine(ex.Message);
continue;
}
// read barcodes from image
Vintasoft.Barcode.IBarcodeInfo[] barcodesInfo = reader.ReadBarcodes(barcodeImage);
// free image resource
barcodeImage.Dispose();
// output information about barcodes
if (barcodesInfo.Length == 0)
{
System.Console.WriteLine("No barcodes found.");
}
else
{
for (int j = 0; j < barcodesInfo.Length; j++)
System.Console.WriteLine(string.Format("[{0}] {1}", barcodesInfo[j].BarcodeType,
barcodesInfo[j].Value));
}
}
}
}
}
}
' Important: You need Vintasoft.Barcode.dll,
' Vintasoft.Imaging.dll,
' Vintasoft.Imaging.Pdf.dll assemblies
' to run this code.
Public Shared Sub ReadBarcodesFromPDFDocumentResources(pdfFilename As String)
' open PDF document
Using document As New PdfDocument(pdfFilename)
' for each PDF page
For i As Integer = 0 To document.Pages.Count - 1
' get image resources of PDF page
Dim imageResources As PdfImageResource() = document.Pages(i).GetImages()
' foreach image resources
For j As Integer = 0 To imageResources.Length - 1
' get image resource
Using imageResource As VintasoftImage = imageResources(j).GetImage()
' get image of image resource
Using bitmap As Image = imageResource.GetAsBitmap()
Console.WriteLine(String.Format("[Page {0}, resource {1}]", i + 1, j + 1))
' read barcodes from image
ReadBarcodesFromImage(bitmap)
End Using
End Using
Next
Next
End Using
End Sub
Public Shared Sub ReadBarcodesFromImage(barcodeImage As Image)
' create barcode reader
Using reader As New BarcodeReader()
' specify that reader must search for Code39, Code39Extended,
' Code128, SSCC18 and DataMatrix barcodes
reader.Settings.ScanBarcodeTypes = BarcodeType.Code39 Or BarcodeType.Code128 Or BarcodeType.DataMatrix
reader.Settings.ScanBarcodeSubsets.Add(BarcodeSymbologySubsets.Code39Extended)
reader.Settings.ScanBarcodeSubsets.Add(BarcodeSymbologySubsets.SSCC18)
' specify that reader must search for horizontal and vertical barcodes only
reader.Settings.ScanDirection = ScanDirection.Horizontal Or ScanDirection.Vertical
' use Automatic Recognition
reader.Settings.AutomaticRecognition = True
' expected one barcode
reader.Settings.ExpectedBarcodes = 1
' scan interval - 5 pixels
reader.Settings.ScanInterval = 5
' read barcodes from image
Dim infos As IBarcodeInfo() = reader.ReadBarcodes(barcodeImage)
' if barcodes are not detected
If infos.Length = 0 Then
Console.WriteLine("No barcodes found.")
Else
' if barcodes are detected
' get information about extracted barcodes
Console.WriteLine(String.Format("{0} barcodes found:", infos.Length))
Console.WriteLine()
For i As Integer = 0 To infos.Length - 1
Dim info As IBarcodeInfo = infos(i)
Console.WriteLine(String.Format("[{0}:{1}]", i + 1, info.BarcodeType))
Console.WriteLine(String.Format("Value: {0}", info.Value))
Console.WriteLine(String.Format("Region: {0}", info.Region))
Console.WriteLine()
Next
End If
End Using
End Sub
// The project, which uses this code, must have references to the following assemblies:
// - Vintasoft.Barcode
/// <summary>
/// Reads barcodes from image-resources of PDF document.
/// </summary>
/// <param name="pdfFilename">A path to a PDF document.</param>
public static void ReadBarcodesFromPdfDocumentResources(string pdfFilename)
{
// open PDF document
using (Vintasoft.Imaging.Pdf.PdfDocument document = new Vintasoft.Imaging.Pdf.PdfDocument(pdfFilename))
{
// for each PDF page
for (int i = 0; i < document.Pages.Count; i++)
{
// get image resources of PDF page
Vintasoft.Imaging.Pdf.Tree.PdfImageResource[] imageResources = document.Pages[i].GetImages();
// foreach image resources
for (int j = 0; j < imageResources.Length; j++)
{
// get image resource
using (Vintasoft.Imaging.VintasoftImage imageResource = imageResources[j].GetImage())
{
// get image of image resource
using (System.Drawing.Image bitmap = imageResource.GetAsBitmap())
{
System.Console.WriteLine(string.Format("[Page {0}, resource {1}]", i + 1, j + 1));
// read barcodes from image
ReadBarcodesFromImage(bitmap);
}
}
}
}
}
}
/// <summary>
/// Reads barcodes from an image.
/// </summary>
/// <param name="barcodeImage">An image with barcodes.</param>
public static void ReadBarcodesFromImage(System.Drawing.Image barcodeImage)
{
// create barcode reader
using (Vintasoft.Barcode.BarcodeReader reader = new Vintasoft.Barcode.BarcodeReader())
{
// specify that reader must search for Code39, Code39Extended,
// Code128, SSCC18 and DataMatrix barcodes
reader.Settings.ScanBarcodeTypes =
Vintasoft.Barcode.BarcodeType.Code39 |
Vintasoft.Barcode.BarcodeType.Code128 |
Vintasoft.Barcode.BarcodeType.DataMatrix;
reader.Settings.ScanBarcodeSubsets.Add(Vintasoft.Barcode.SymbologySubsets.BarcodeSymbologySubsets.Code39Extended);
reader.Settings.ScanBarcodeSubsets.Add(Vintasoft.Barcode.SymbologySubsets.BarcodeSymbologySubsets.SSCC18);
// specify that reader must search for horizontal and vertical barcodes only
reader.Settings.ScanDirection = Vintasoft.Barcode.ScanDirection.Horizontal | Vintasoft.Barcode.ScanDirection.Vertical;
// use Automatic Recognition
reader.Settings.AutomaticRecognition = true;
// expected one barcode
reader.Settings.ExpectedBarcodes = 1;
// scan interval - 5 pixels
reader.Settings.ScanInterval = 5;
// read barcodes from image
Vintasoft.Barcode.IBarcodeInfo[] infos = reader.ReadBarcodes(barcodeImage);
// if barcodes are not detected
if (infos.Length == 0)
{
System.Console.WriteLine("No barcodes found.");
}
// if barcodes are detected
else
{
// get information about extracted barcodes
System.Console.WriteLine(string.Format("{0} barcodes found:", infos.Length));
System.Console.WriteLine();
for (int i = 0; i < infos.Length; i++)
{
Vintasoft.Barcode.IBarcodeInfo info = infos[i];
System.Console.WriteLine(string.Format("[{0}:{1}]", i + 1, info.BarcodeType));
System.Console.WriteLine(string.Format("Value: {0}", info.Value));
System.Console.WriteLine(string.Format("Region: {0}", info.Region));
System.Console.WriteLine();
}
}
}
}
' Important: You need Vintasoft.Barcode.dll,
' Vintasoft.Imaging.dll,
' Vintasoft.Imaging.Pdf.dll assemblies
' to run this code.
Public Shared Sub ReadBarcodesFromVectorPDFDocument(pdfFilename As String)
' create the image collection
Using pdfPages As New ImageCollection()
' add PDF document to the image collection
pdfPages.Add(pdfFilename)
' set the rendering settings if necessary
pdfPages.SetRenderingSettings(New RenderingSettings(New Resolution(200, 200)))
' for each PDF page
For Each image As VintasoftImage In pdfPages
' get page image
Using pageImage As Image = image.GetAsBitmap()
' read barcodes from image
ReadBarcodesFromImage(pageImage)
End Using
Next
' clear image collection
pdfPages.ClearAndDisposeItems()
End Using
End Sub
Public Shared Sub ReadBarcodesFromImage(barcodeImage As Image)
' create barcode reader
Dim reader As New BarcodeReader()
' specify that reader must search for Code39, Code39Extended,
' Code128, SSCC18 and DataMatrix barcodes
reader.Settings.ScanBarcodeTypes = BarcodeType.Code39 Or BarcodeType.Code128 Or BarcodeType.DataMatrix
reader.Settings.ScanBarcodeSubsets.Add(BarcodeSymbologySubsets.Code39Extended)
reader.Settings.ScanBarcodeSubsets.Add(BarcodeSymbologySubsets.SSCC18)
' specify that reader must search for horizontal and vertical barcodes only
reader.Settings.ScanDirection = ScanDirection.Horizontal Or ScanDirection.Vertical
' use Automatic Recognition
reader.Settings.AutomaticRecognition = True
' read barcodes from image
Dim infos As IBarcodeInfo() = reader.ReadBarcodes(barcodeImage)
' if barcodes are not detected
If infos.Length = 0 Then
Console.WriteLine("No barcodes found.")
Else
' if barcodes are detected
' get information about extracted barcodes
Console.WriteLine(String.Format("{0} barcodes found:", infos.Length))
Console.WriteLine()
For i As Integer = 0 To infos.Length - 1
Dim info As IBarcodeInfo = infos(i)
Console.WriteLine(String.Format("[{0}:{1}]", i + 1, info.BarcodeType))
Console.WriteLine(String.Format("Value: {0}", info.Value))
Console.WriteLine(String.Format("Region: {0}", info.Region))
Console.WriteLine()
Next
End If
End Sub
// The project, which uses this code, must have references to the following assemblies:
// - Vintasoft.Barcode
/// <summary>
/// Reads barcodes from a vector PDF document.
/// </summary>
/// <param name="pdfFilename">A path to a PDF document.</param>
public static void ReadBarcodesFromVectorPDFDocument(string pdfFilename)
{
// create the image collection
using (Vintasoft.Imaging.ImageCollection pdfPages = new Vintasoft.Imaging.ImageCollection())
{
// add PDF document to the image collection
pdfPages.Add(pdfFilename);
// set the rendering settings if necessary
pdfPages.SetRenderingSettings(new Vintasoft.Imaging.Codecs.Decoders.RenderingSettings(new Vintasoft.Imaging.Resolution(200, 200)));
// for each PDF page
foreach (Vintasoft.Imaging.VintasoftImage image in pdfPages)
{
// get page image
using (System.Drawing.Image pageImage = image.GetAsBitmap())
{
// read barcodes from image
ReadBarcodesFromImage(pageImage);
}
}
// clear image collection
pdfPages.ClearAndDisposeItems();
}
}
/// <summary>
/// Reads barcodes from an image.
/// </summary>
/// <param name="barcodeImage">An image with barcodes.</param>
public static void ReadBarcodesFromImage(System.Drawing.Image barcodeImage)
{
// create barcode reader
Vintasoft.Barcode.BarcodeReader reader = new Vintasoft.Barcode.BarcodeReader();
// specify that reader must search for Code39, Code39Extended,
// Code128, SSCC18 and DataMatrix barcodes
reader.Settings.ScanBarcodeTypes =
Vintasoft.Barcode.BarcodeType.Code39 |
Vintasoft.Barcode.BarcodeType.Code128 |
Vintasoft.Barcode.BarcodeType.DataMatrix;
reader.Settings.ScanBarcodeSubsets.Add(Vintasoft.Barcode.SymbologySubsets.BarcodeSymbologySubsets.Code39Extended);
reader.Settings.ScanBarcodeSubsets.Add(Vintasoft.Barcode.SymbologySubsets.BarcodeSymbologySubsets.SSCC18);
// specify that reader must search for horizontal and vertical barcodes only
reader.Settings.ScanDirection = Vintasoft.Barcode.ScanDirection.Horizontal | Vintasoft.Barcode.ScanDirection.Vertical;
// use Automatic Recognition
reader.Settings.AutomaticRecognition = true;
// read barcodes from image
Vintasoft.Barcode.IBarcodeInfo[] infos = reader.ReadBarcodes(barcodeImage);
// if barcodes are not detected
if (infos.Length == 0)
{
System.Console.WriteLine("No barcodes found.");
}
// if barcodes are detected
else
{
// get information about extracted barcodes
System.Console.WriteLine(string.Format("{0} barcodes found:", infos.Length));
System.Console.WriteLine();
for (int i = 0; i < infos.Length; i++)
{
Vintasoft.Barcode.IBarcodeInfo info = infos[i];
System.Console.WriteLine(string.Format("[{0}:{1}]", i + 1, info.BarcodeType));
System.Console.WriteLine(string.Format("Value: {0}", info.Value));
System.Console.WriteLine(string.Format("Region: {0}", info.Region));
System.Console.WriteLine();
}
}
}