LEADTOOLSバーコード(Leadtools.Barcodeアセンブリ)

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QRBarcodeDataクラス








メンバ 
単一のQRバーコードのためにデータを格納します。
オブジェクトモデル
構文
'Declaration
 
<TypeConverterAttribute()>
<SerializableAttribute()>
Public Class QRBarcodeData 
   Inherits BarcodeData
   Implements System.ICloneable 
'Usage
 
Dim instance As QRBarcodeData
public sealed class QRBarcodeData : System.ICloneable  
@interface LTQRBarcodeData : LTBarcodeData >NSCopying<
public class QRBarcodeData extends BarcodeData
function Leadtools.Barcode.QRBarcodeData()
[TypeConverterAttribute()]
[SerializableAttribute()]
public ref class QRBarcodeData : public BarcodeData, System.ICloneable  
解説

QRBarcodeDataBarcodeData基本クラスから派生したクラスで、QRバーコードの読み取りまたは書き込みに使用できる固有のデータが追加されています。

読み取りバーコード

BarcodeReaderオブジェクトがQR(BarcodeSymbology.QR)を検出して読み取るとき、BarcodeReader.ReadBarcodeBarcodeReader.ReadBarcodesのメソッドは、見つかったバーコードごとに、基本BarcodeDataクラスにキャストされたQRBarcodeDataオブジェクトを返します。

NET標準のキャストによってオブジェクトをQRBarcodeDataとして取得してから、このバーコード体系に関連する追加のデータプロパティを調べます。

ベースBarcodeDataオブジェクトで通常返されるすべてのデータメンバに加えて、このクラスには以下のメンバが追加されています。

上記のメンバに加えて、バーコードデータに関連しないそのほかの他のQR読み取りオプションをQRBarcodeReadOptionsクラスを使用して設定できます。

バーコードの書き込み

BarcodeWriterクラスには、画像へのバーコードの書き込みに使用するWriteBarcodeメソッドがあります。このメソッドは、ベースBarcodeDataとしてデータパラメータを受け取りますオブジェクト。QRバーコードを書き込むには、QRBarcodeDataのインスタンスを作成して必要なパラメーターを設定し、このオブジェクトをWriteBarcodeのデータパラメーターに渡します。

ベースBarcodeDataオブジェクトで通常通り設定されなければならなくて、以下のメンバを指定するすべてのデータメンバに加えて:

上記のメンバに加えて、バーコードデータに関係しないそのほかのQR書き込みオプションはQRBarcodeWriteOptionsクラスを使用して設定できます。

次のように、static (Visual BasicではShared)BarcodeData.CreateDefaultBarcodeDataメソッドを使用して、画像への書き込み用に設定されたデフォルトパラメーターを含むQRBarcodeDataの新しいインスタンスを作成できます。

[Visual Basic]


             Dim qrData As QRBarcodeData = DirectCast(BarcodeData.CreateDefaultBarcodeData(BarcodeSymbology.QR), QRBarcodeData)
             

[C#]


             QRBarcodeData qrData = BarcodeData.CreateDefaultBarcodeData(BarcodeSymbology.QR) as QRBarcodeData;
             
サンプル

このサンプルは、異なるオプションを使用していくつかのQRバーコードを画像に書き込んだ後、再び読み取ります。

Copy Code  
Imports Leadtools
Imports Leadtools.Codecs
Imports Leadtools.Forms
Imports Leadtools.Barcode
Imports Leadtools.ImageProcessing

      
Public Sub QRBarcode_Example()
   Dim imageFileName As String = Path.Combine(LEAD_VARS.ImagesDir, "MyQRBarcodes.tif")
   Dim engine As New BarcodeEngine()

   ' Create the image to write the barcodes to
   Dim resolution As Integer = 300
   Using image As RasterImage = RasterImage.Create(CType(8.5 * resolution, Integer), CType(11.0 * resolution, Integer), 1, resolution, RasterColor.FromKnownColor(RasterKnownColor.White))
      ' Write two QR barcodes
      WriteBarcode(engine.Writer, image, QRBarcodeSymbolModel.Model1AutoSize, "QR Data 1", False)
      WriteBarcode(engine.Writer, image, QRBarcodeSymbolModel.Model2Version30, "QR Data 2", True)

      ' Save the image
      Using codecs As New RasterCodecs()
         codecs.Save(image, imageFileName, RasterImageFormat.CcittGroup4, 1)
      End Using
   End Using

   ' Now read the barcodes again
   Using codecs As New RasterCodecs()
      Using image As RasterImage = codecs.Load(imageFileName)
         ' Read all the QR barcodes
         ReadBarcodes(engine.Reader, image)
      End Using
   End Using
End Sub

Private Sub WriteBarcode(ByVal writer As BarcodeWriter, ByVal image As RasterImage, ByVal symbolModel As QRBarcodeSymbolModel, ByVal value As String, ByVal topLeft As Boolean)
   ' Create the barcode data
   Dim barcode As QRBarcodeData = DirectCast(BarcodeData.CreateDefaultBarcodeData(BarcodeSymbology.QR), QRBarcodeData)
   barcode.SymbolModel = symbolModel
   barcode.Value = value

   ' We will use the alignment to position the barcodes, so use all of the image
   barcode.Bounds = New LogicalRectangle(0, 0, image.ImageWidth, image.ImageHeight, LogicalUnit.Pixel)

   ' Set the write options
   Dim options As New QRBarcodeWriteOptions()

   If topLeft Then
      options.HorizontalAlignment = BarcodeAlignment.Near
      options.VerticalAlignment = BarcodeAlignment.Near
   Else
      options.HorizontalAlignment = BarcodeAlignment.Far
      options.VerticalAlignment = BarcodeAlignment.Far
   End If

   options.GroupNumber = 0
   options.GroupTotal = 0
   options.XModule = 30
   options.ECCLevel = QRBarcodeECCLevel.LevelL

   ' Write it
   Console.WriteLine("Writing barcode with symbol model: {0} and Data: {1}", symbolModel, value)
   writer.WriteBarcode(image, barcode, options)
End Sub

Private Sub ReadBarcodes(ByVal reader As BarcodeReader, ByVal image As RasterImage)
   ' Setup read options
   Dim options As New QRBarcodeReadOptions()
   options.EnableDoublePass = False

   Console.WriteLine("Reading QR barcodes")
   Dim barcodes() As BarcodeData = reader.ReadBarcodes(image, LogicalRectangle.Empty, 0, New BarcodeSymbology() {BarcodeSymbology.QR}, New BarcodeReadOptions() {options})
   Console.WriteLine("{0} barcodes found:", barcodes.Length)
   For Each barcode As QRBarcodeData In barcodes
      Dim value As String = BarcodeData.ParseECIData(barcode.GetData())
      If String.IsNullOrEmpty(value) Then
         value = barcode.Value
      End If

      Console.WriteLine(" At {0}, symbol model: {1} and data: {2}", barcode.Bounds, barcode.SymbolModel, value)
   Next
End Sub

Public NotInheritable Class LEAD_VARS
Public Const ImagesDir As String = "C:\Users\Public\Documents\LEADTOOLS Images"
End Class
using Leadtools;
using Leadtools.Codecs;
using Leadtools.Forms;
using Leadtools.Barcode;
using Leadtools.ImageProcessing;

      
public void QRBarcode_Example()
{
   string imageFileName = Path.Combine(LEAD_VARS.ImagesDir, "MyQRBarcodes.tif");
   BarcodeEngine engine = new BarcodeEngine();

   // Create the image to write the barcodes to
   int resolution = 300;
   using(RasterImage image = RasterImage.Create((int)(8.5 * resolution), (int)(11.0 * resolution), 1, resolution, RasterColor.FromKnownColor(RasterKnownColor.White)))
   {
      // Write two QR barcodes
      WriteBarcode(engine.Writer, image, QRBarcodeSymbolModel.Model1AutoSize, "QR Data 1", false);
      WriteBarcode(engine.Writer, image, QRBarcodeSymbolModel.Model2Version30, "QR Data 2", true);

      // Save the image
      using(RasterCodecs codecs = new RasterCodecs())
      {
         codecs.Save(image, imageFileName, RasterImageFormat.CcittGroup4, 1);
      }
   }

   // Now read the barcodes again
   using(RasterCodecs codecs = new RasterCodecs())
   {
      using(RasterImage image = codecs.Load(imageFileName))
      {
         // Read all the QR barcodes
         ReadBarcodes(engine.Reader, image);
      }
   }
}

private void WriteBarcode(BarcodeWriter writer, RasterImage image, QRBarcodeSymbolModel symbolModel, string value, bool topLeft)
{
   // Create the barcode data
   QRBarcodeData barcode = BarcodeData.CreateDefaultBarcodeData(BarcodeSymbology.QR) as QRBarcodeData;
   barcode.SymbolModel = symbolModel;
   barcode.Value = value;

   // We will use the alignment to position the barcodes, so use all of the image
   barcode.Bounds = new LogicalRectangle(0, 0, image.ImageWidth, image.ImageHeight, LogicalUnit.Pixel);

   // Set the write options
   QRBarcodeWriteOptions options = new QRBarcodeWriteOptions();

   if(topLeft)
   {
      options.HorizontalAlignment = BarcodeAlignment.Near;
      options.VerticalAlignment = BarcodeAlignment.Near;
   }
   else
   {
      options.HorizontalAlignment = BarcodeAlignment.Far;
      options.VerticalAlignment = BarcodeAlignment.Far;
   }

   options.GroupNumber = 0;
   options.GroupTotal = 0;
   options.XModule = 30;
   options.ECCLevel = QRBarcodeECCLevel.LevelL;

   // Write it
   Console.WriteLine("Writing barcode with symbol model: {0} and Data: {1}", symbolModel, value);
   writer.WriteBarcode(image, barcode, options);
}

private void ReadBarcodes(BarcodeReader reader, RasterImage image)
{
   // Setup read options
   QRBarcodeReadOptions options = new QRBarcodeReadOptions();
   options.EnableDoublePass = false;

   Console.WriteLine("Reading QR barcodes");
   BarcodeData[] barcodes = reader.ReadBarcodes(image, LogicalRectangle.Empty, 0, new BarcodeSymbology[] { BarcodeSymbology.QR }, new BarcodeReadOptions[] { options });
   Console.WriteLine("{0} barcodes found:", barcodes.Length);
   foreach(QRBarcodeData barcode in barcodes)
   {
      string value = BarcodeData.ParseECIData(barcode.GetData());
      if(string.IsNullOrEmpty(value))
         value = barcode.Value;

      Console.WriteLine(" At {0}, symbol model: {1} and data: {2}", barcode.Bounds, barcode.SymbolModel, value);
   }
}

static class LEAD_VARS
{
public const string ImagesDir = @"C:\Users\Public\Documents\LEADTOOLS Images";
}
using Leadtools;
using Leadtools.Codecs;
using Leadtools.Barcode;
using Leadtools.ImageProcessing;

      
public async Task QRBarcode_Example()
{
   string imageFileName = @"MyQRBarcodes.tif";
   BarcodeEngine engine = new BarcodeEngine();

   // Create the image to write the barcodes to
   int resolution = 300;
   using(RasterImage image = RasterImage.Create((int)(8.5 * resolution), (int)(11.0 * resolution), 1, resolution, RasterColorHelper.FromKnownColor(RasterKnownColor.White)))
   {
      // Write two QR barcodes
      WriteBarcode(engine.Writer, image, QRBarcodeSymbolModel.Model1AutoSize, "QR Data 1", false);
      WriteBarcode(engine.Writer, image, QRBarcodeSymbolModel.Model2Version30, "QR Data 2", true);

      // Save the image
      using(RasterCodecs codecs = new RasterCodecs())
      {
         StorageFile saveFile = await Tools.AppLocalFolder.CreateFileAsync(imageFileName);
         await codecs.SaveAsync(image, LeadStreamFactory.Create(saveFile), RasterImageFormat.CcittGroup4, 1);
      }
   }

   // Now read the barcodes again
   using(RasterCodecs codecs = new RasterCodecs())
   {
      StorageFile loadFile = await Tools.AppInstallFolder.GetFileAsync(imageFileName);
      using(RasterImage image = await codecs.LoadAsync(LeadStreamFactory.Create(loadFile)))
      {
         // Read all the QR barcodes
         ReadBarcodes(engine.Reader, image);
      }
   }
}

private void WriteBarcode(BarcodeWriter writer, RasterImage image, QRBarcodeSymbolModel symbolModel, string value, bool topLeft)
{
   // Create the barcode data
   BarcodeData barcode = BarcodeData.CreateDefaultBarcodeData(BarcodeSymbology.QR);
   barcode.QRSymbolModel = symbolModel;
   barcode.Value = value;

   // We will use the alignment to position the barcodes, so use all of the image
   barcode.Bounds = LeadRectHelper.Create(0, 0, image.ImageWidth, image.ImageHeight);

   // Set the write options
   QRBarcodeWriteOptions options = new QRBarcodeWriteOptions();

   if(topLeft)
   {
      options.HorizontalAlignment = BarcodeAlignment.Near;
      options.VerticalAlignment = BarcodeAlignment.Near;
   }
   else
   {
      options.HorizontalAlignment = BarcodeAlignment.Far;
      options.VerticalAlignment = BarcodeAlignment.Far;
   }

   options.GroupNumber = 0;
   options.GroupTotal = 0;
   options.XModule = 30;
   options.ECCLevel = QRBarcodeECCLevel.LevelL;

   // Write it
   Debug.WriteLine("Writing barcode with symbol model: {0} and Data: {1}", symbolModel, value);
   writer.WriteBarcode(image, barcode, options);
}

private void ReadBarcodes(BarcodeReader reader, RasterImage image)
{
   // Setup read options
   QRBarcodeReadOptions options = new QRBarcodeReadOptions();
   options.EnableDoublePass = false;

   Debug.WriteLine("Reading QR barcodes");
   BarcodeData[] barcodes = reader.ReadBarcodes(image, LeadRectHelper.Empty, 0, new BarcodeSymbology[] { BarcodeSymbology.QR }, new IBarcodeReadOptions[] { options });
   if (barcodes == null)
   {
      Debug.WriteLine("No barcodes found");
      return;
   }

   Debug.WriteLine("{0} barcodes found:", barcodes.Length);
   foreach(BarcodeData barcode in barcodes)
   {
      Debug.WriteLine(" At {0}, symbol model: {1} and data: {2}", barcode.Bounds, barcode.QRSymbolModel, barcode.Value);
   }
}
using Leadtools;
using Leadtools.Codecs;
using Leadtools.Forms;
using Leadtools.Barcode;
using Leadtools.ImageProcessing;
using Leadtools.Examples;

public void QRBarcode_Example(RasterImage image, Stream outStream)
{
   BarcodeEngine engine = new BarcodeEngine();
   // Create the image to write the barcodes to
   RasterCodecs codecs = new RasterCodecs();

   // Write two QR barcodes
   WriteBarcode(engine.Writer, image, QRBarcodeSymbolModel.Model1AutoSize, "QR Data 1", false);
   WriteBarcode(engine.Writer, image, QRBarcodeSymbolModel.Model2Version30, "QR Data 2", true);

   // Save the image
   codecs.Save(image, outStream, RasterImageFormat.CcittGroup4, 1);

   // Now read the barcodes again
   // Read all the QR barcodes
   ReadBarcodes(engine.Reader, image);
}

private void WriteBarcode(BarcodeWriter writer, RasterImage image, QRBarcodeSymbolModel symbolModel, string value, bool topLeft)
{
   // Create the barcode data
   QRBarcodeData barcode = BarcodeData.CreateDefaultBarcodeData(BarcodeSymbology.QR) as QRBarcodeData;
   barcode.SymbolModel = symbolModel;
   barcode.Value = value;

   // We will use the alignment to position the barcodes, so use all of the image
   barcode.Bounds = new LogicalRectangle(0, 0, image.ImageWidth, image.ImageHeight, LogicalUnit.Pixel);

   // Set the write options
   QRBarcodeWriteOptions options = new QRBarcodeWriteOptions();

   if(topLeft)
   {
      options.HorizontalAlignment = BarcodeAlignment.Near;
      options.VerticalAlignment = BarcodeAlignment.Near;
   }
   else
   {
      options.HorizontalAlignment = BarcodeAlignment.Far;
      options.VerticalAlignment = BarcodeAlignment.Far;
   }

   options.GroupNumber = 0;
   options.GroupTotal = 0;
   options.XModule = 30;
   options.ECCLevel = QRBarcodeECCLevel.LevelL;

   // Write it
   Console.WriteLine("Writing barcode with symbol model: {0} and Data: {1}", symbolModel, value);
   writer.WriteBarcode(image, barcode, options);
}

private void ReadBarcodes(BarcodeReader reader, RasterImage image)
{
   // Setup read options
   QRBarcodeReadOptions options = new QRBarcodeReadOptions();
   options.EnableDoublePass = false;

   Console.WriteLine("Reading QR barcodes");
   BarcodeData[] barcodes = reader.ReadBarcodes(image, LogicalRectangle.Empty, 0, new BarcodeSymbology[] { BarcodeSymbology.QR }, new BarcodeReadOptions[] { options });
   Console.WriteLine("{0} barcodes found:", barcodes.Length);
   foreach(QRBarcodeData barcode in barcodes)
   {
      Console.WriteLine(" At {0}, symbol model: {1} and data: {2}", barcode.Bounds, barcode.SymbolModel, barcode.Value);
   }
}
Imports Leadtools
Imports Leadtools.Codecs
Imports Leadtools.Forms
Imports Leadtools.Barcode
Imports Leadtools.ImageProcessing

Public Sub QRBarcode_Example(ByVal image As RasterImage, ByVal outStream As Stream)
  Dim engine As BarcodeEngine = New BarcodeEngine()
  ' Create the image to write the barcodes to
  Dim codecs As RasterCodecs = New RasterCodecs()

  ' Write two QR barcodes
  WriteBarcode(engine.Writer, image, QRBarcodeSymbolModel.Model1AutoSize, "QR Data 1", False)
  WriteBarcode(engine.Writer, image, QRBarcodeSymbolModel.Model2Version30, "QR Data 2", True)

  ' Save the image
  codecs.Save(image, outStream, RasterImageFormat.CcittGroup4, 1)

  ' Now read the barcodes again
  ' Read all the QR barcodes
  ReadBarcodes(engine.Reader, image)
End Sub

Private Sub WriteBarcode(ByVal writer As BarcodeWriter, ByVal image As RasterImage, ByVal symbolModel As QRBarcodeSymbolModel, ByVal value As String, ByVal topLeft As Boolean)
  ' Create the barcode data
  Dim barcode As QRBarcodeData = TryCast(BarcodeData.CreateDefaultBarcodeData(BarcodeSymbology.QR), QRBarcodeData)
  barcode.SymbolModel = symbolModel
  barcode.Value = value

  ' We will use the alignment to position the barcodes, so use all of the image
  barcode.Bounds = New LogicalRectangle(0, 0, image.ImageWidth, image.ImageHeight, LogicalUnit.Pixel)

  ' Set the write options
  Dim options As QRBarcodeWriteOptions = New QRBarcodeWriteOptions()

  If topLeft Then
    options.HorizontalAlignment = BarcodeAlignment.Near
    options.VerticalAlignment = BarcodeAlignment.Near
  Else
    options.HorizontalAlignment = BarcodeAlignment.Far
    options.VerticalAlignment = BarcodeAlignment.Far
  End If

  options.GroupNumber = 0
  options.GroupTotal = 0
  options.XModule = 30
  options.ECCLevel = QRBarcodeECCLevel.LevelL

  ' Write it
  Console.WriteLine("Writing barcode with symbol model: {0} and Data: {1}", symbolModel, value)
  writer.WriteBarcode(image, barcode, options)
End Sub

Private Sub ReadBarcodes(ByVal reader As BarcodeReader, ByVal image As RasterImage)
  ' Setup read options
  Dim options As QRBarcodeReadOptions = New QRBarcodeReadOptions()
  options.EnableDoublePass = False

  Console.WriteLine("Reading QR barcodes")
  Dim barcodes As BarcodeData() = reader.ReadBarcodes(image, LogicalRectangle.Empty, 0, New BarcodeSymbology() { BarcodeSymbology.QR }, New BarcodeReadOptions() { options })
  Console.WriteLine("{0} barcodes found:", barcodes.Length)
  For Each barcode As QRBarcodeData In barcodes
    Console.WriteLine(" At {0}, symbol model: {1} and data: {2}", barcode.Bounds, barcode.SymbolModel, barcode.Value)
  Next barcode
End Sub
必要条件

ターゲットプラットホーム

参照

参照

QRBarcodeDataメンバ
Leadtools.Barcode名前空間
BarcodeDataクラス
BarcodeReaderクラス
BarcodeWriterクラス
BarcodeSymbology列挙体
BarcodeEngineクラス
MicroPDF417BarcodeDataクラス
PDF417BarcodeDataクラス
DatamatrixBarcodeDataクラス
QRBarcodeReadOptionsクラス
QRBarcodeWriteOptionsクラス
BarcodeReader.ReadBarcode
BarcodeReader.ReadBarcodes
BarcodeWriter.WriteBarcode
LEADTOOLSのQRバーコード
LEADTOOLSバーコードによるプログラミング
サポートされているバーコード体系
バーコードサポートのロック解除
読み取りバーコードチュートリアル
バーコードの書き込みチュートリアル
バーコードの書き込み―四角形とXModule

Leadtools.Barcodeは、バーコードモジュールのライセンスと、解除キーが必要です。詳細は、以下を参照してください。LEADTOOLSツールキット機能