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OpinionsFirst of all, let me compliment you on your Barcode.NET Library. We evaluated a number of products to use in our application, and yours was our favorite. Dan Konigsberg  
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VintaSoftBarcode.NET SDK - FAQQuestions d'ordre général:
Redistribution:
Programmation:
Pour quels buts je peux utiliser VintaSoftBarcode.NET Library?La bibliothèque permet de lire et écrire 1D, postaux et codes-barres 2D à partir d'images numériques et des fichiers PDF.
La bibliothèque, que-ce qu’elle comprend?La bibliothèque comprend:
Dans quels langages de programmation je peux utiliser la bibliothèque VintaSoftBarcode.NET?La licence du développeur et la licence pour la société permettent utiliser composant à:
Licence pour serveur permet d’utiliser composant à:
Quels restrictions existe dans la version non enregistrée de la bibliothèque?La version non enregistrée de la bibliothèque a les limitations suivantes:
Je n'ai pas trouvé la réponse à ma question. Qu’est-ce que je dois faire?L'information sur la plupart des questions peut être trouvée dans la documentation sur le composant ou dans ce FAQ. Si vous n'avez pas trouvé la réponse à votre question, alors écrivez la lettre au service de la maintenance.
Quels fichiers je dois incorparer dans le distributif de mon logiciel?Vous ne devez insérer dans le distributif de votre logiciel qu’un fichier: Vintasoft.Barcode.dll. Après l'installation de Votre logiciel sur l'ordinateur ce fichier doit être placé au catalogue où il y avait une référence à la compilation du logiciel.
Est-ce que je peux diffuser le composant Vintasoft.Barcode.dll avec mon application?Oui, vous pouvez diffuser le composant avec votre application. Vous ne payez que pour l’enregistrement initial. La licence pour la société n'ont pas les restrictions de la diffusion. La licence du développeur a certains restrictions de la diffusion. La diffusion de licence du serveur n'est pas libre de droits. Regardez, s'il vous plaît, l'accord de licence.
Comment puis – je maximiser la vitesse de la lecture du code de barre?Voilà quelques conseils qui permettent de maximiser la vitesse de la lecture des codes de barre:
Quel est le moyen d’obtenir le plus stable système de création et d’identification des codes de barre?Pour accorder le système il faut utiliser l’attribut IBarcodeInfo.ReadingQuality.
Est-ce qu’il y a des recommandations à propos du création des codes de barre à une dimension pour leur identification réussie?Les codes de barre les plus résistants aux ruptures et déformations sont les codes de barre du type Code 39 et Code 128 (avec la somme de contrôle!).
Est-ce qu’il y a des recommandations à propos du création des codes de barre dimétriques pour leur identification réussie?Le code de barre les plus résistant aux ruptures et déformations est le code de barre du type Data Matrix. Le code de barre le plus compact est Aztec, puis DataMatrix, QR Code, et après PDF417.
Est-ce que la librairie supporte le multiflux?Oui. Commençant par la version 5.0 l’algorithme principal se divise en N flux.
Comment puis – je reconnaître le code de barre en image colorée de qualité inférieure?Il existe deux variantes:
[VB.NET]
Private Shared Sub ScanWithIterations(ByVal fileName As String, ByVal barcodes As BarcodeType, _
ByVal expectedBarcodes As Integer, ByVal iterationCount As Integer, ByVal minThreshold As Integer, ByVal maxThreshold As Integer)
Dim barcodeImage As Image = Image.FromFile(fileName)
Dim reader As New BarcodeReader()
reader.Settings.ScanBarcodeTypes = barcodes
reader.Settings.ExpectedBarcodes = expectedBarcodes
reader.Settings.ThresholdIterations = iterationCount
reader.Settings.Threshold1D = minThreshold
reader.Settings.Threshold2D = maxThreshold
' read barcodes
Dim barcodesInfo As IBarcodeInfo() = reader.readBarcodes(barcodeImage)
If barcodesInfo.Length = 0 Then
Console.WriteLine("No barcodes found.")
Else
For i As Integer = 0 To barcodesInfo.Length - 1
Dim inf As IBarcodeInfo = barcodesInfo(i)
Console.WriteLine(String.Format("[{0}] {1} (Threshold: {2})", inf.BarcodeType, inf.Value, inf.Threshold))
Next
End If
barcodeImage.Dispose()
End Sub
Private Shared Sub TestScanWithIterationsCode128orDataMatrix(ByVal fileName As String)
' find one Code 128 or DataMatrix barcode from 400 to 600 threshold (10 iterations)
ScanWithIterations(fileName, BarcodeType.Code128 Or BarcodeType.DataMatrix, 1, 10, 400, 600)
End Sub
[C#]
static void ScanWithIterations(string fileName, BarcodeType barcodes, int expectedBarcodes,
int iterationCount, int minThreshold, int maxThreshold)
{
Image barcodeImage = Image.FromFile(fileName);
BarcodeReader reader = new BarcodeReader();
reader.Settings.ScanBarcodeTypes = barcodes;
reader.Settings.ExpectedBarcodes = expectedBarcodes;
reader.Settings.ThresholdIterations = iterationCount;
reader.Settings.Threshold1D = minThreshold;
reader.Settings.Threshold2D = maxThreshold;
// read barcodes
IBarcodeInfo[] barcodesInfo = reader.ReadBarcodes(barcodeImage);
if (barcodesInfo.Length == 0)
{
Console.WriteLine("No barcodes found.");
}
else
{
for (int i = 0; i < barcodesInfo.Length; i++)
{
IBarcodeInfo inf = barcodesInfo[i];
Console.WriteLine(string.Format("[{0}] {1} (Threshold: {2})", inf.BarcodeType, inf.Value, inf.Threshold));
}
}
barcodeImage.Dispose();
}
static void TestScanWithIterationsCode128orDataMatrix(string fileName)
{
// find one Code 128 or DataMatrix barcode from 400 to 600 threshold (10 iterations)
ScanWithIterations(fileName, BarcodeType.Code128 | BarcodeType.DataMatrix, 1, 10, 400, 600);
}
Est-ce que je peux lire des codes à barres du fichier TIFF multi-page?Oui, l'exemple:
[VB.NET]
Private Shared Sub ReadBarcodesFromMiltipageTiffFile(ByVal fileName As String, ByVal barcodes As BarcodeType)
' open tiff image
Dim tiffImage As Image = Image.FromFile(fileName)
Dim index As Guid = tiffImage.FrameDimensionsList(0)
Dim dimension As New FrameDimension(index)
Dim pageCount As Integer = tiffImage.GetFrameCount(dimension)
' create reader
Dim reader As New BarcodeReader()
reader.Settings.ScanBarcodeTypes = barcodes
' read barcodes from all pages
For i As Integer = 0 To pageCount - 1
' selects a page
tiffImage.SelectActiveFrame(dimension, i)
' read barcodes from page i
Dim barcodesInfo As IBarcodeInfo() = reader.readBarcodes(tiffImage)
' write information
Console.WriteLine(String.Format("Page {0}: ", i))
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
' free resources
tiffImage.Dispose()
End Sub
[C#]
static void ReadBarcodesFromMiltipageTiffFile(string fileName, BarcodeType barcodes)
{
// open tiff image
Image tiffImage = Image.FromFile(fileName);
Guid index = tiffImage.FrameDimensionsList[0];
FrameDimension dimension = new FrameDimension(index);
int pageCount = tiffImage.GetFrameCount(dimension);
// create reader
BarcodeReader reader = new BarcodeReader();
reader.Settings.ScanBarcodeTypes = barcodes;
// read barcodes from all pages
for (int i = 0; i < pageCount; i++)
{
// selects a page
tiffImage.SelectActiveFrame(dimension, i);
// read barcodes from page i
IBarcodeInfo[] barcodesInfo = reader.ReadBarcodes(tiffImage);
// write information
Console.WriteLine(string.Format("Page {0}: ", i));
if (barcodesInfo.Length == 0)
{
Console.WriteLine("No barcodes found.");
}
else
{
for (int j = 0; j < barcodesInfo.Length; j++)
Console.WriteLine(string.Format("[{0}] {1}", barcodesInfo[j].BarcodeType, barcodesInfo[j].Value));
}
}
// free resources
tiffImage.Dispose();
}
Est-ce que je peux lire des codes à barres du document PDF?Oui, l'exemple:
[VB.NET]
Private Shared Sub ReadBarcodesFromPdfDocument(ByVal fileName As String, ByVal barcodes As BarcodeType)
' open PDF document
Dim pdfImageViewer As New PdfImageViewer(fileName)
' create reader
Dim reader As New BarcodeReader()
reader.Settings.ScanBarcodeTypes = barcodes
' read barcodes from all pages
For i As Integer = 0 To pdfImageViewer.PageCount - 1
' get all images names from page i
Dim imageNames As String() = pdfImageViewer.GetImageNames(i)
' foreach images in 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 with name imageNames[k]
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
Dim barcodesInfo As IBarcodeInfo() = reader.readBarcodes(barcodeImage)
' write information
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
' free resources
pdfImageViewer.Dispose()
End Sub
[C#]
static void ReadBarcodesFromPdfDocument(string fileName, BarcodeType barcodes)
{
// open PDF document
PdfImageViewer pdfImageViewer = new PdfImageViewer(fileName);
// create reader
BarcodeReader reader = new BarcodeReader();
reader.Settings.ScanBarcodeTypes = barcodes;
// read barcodes from all pages
for (int i = 0; i < pdfImageViewer.PageCount; i++)
{
// get all images names from page i
string[] imageNames = pdfImageViewer.GetImageNames(i);
// foreach images in page i
for (int k = 0; k < imageNames.Length; k++)
{
Console.WriteLine(string.Format("Page {0}, image {1}: ", i, imageNames[k]));
Image barcodeImage;
// get image with name imageNames[k]
try
{
barcodeImage = pdfImageViewer.GetImage(i, imageNames[k]);
}
catch(Exception e)
{
// not supported image format
Console.WriteLine(e.Message);
continue;
}
// read barcodes
IBarcodeInfo[] barcodesInfo = reader.ReadBarcodes(barcodeImage);
// write information
if (barcodesInfo.Length == 0)
{
Console.WriteLine("No barcodes found.");
}
else
{
for (int j = 0; j < barcodesInfo.Length; j++)
Console.WriteLine(string.Format("[{0}] {1}", barcodesInfo[j].BarcodeType, barcodesInfo[j].Value));
}
}
}
// free resources
pdfImageViewer.Dispose();
}
Comment puis-je placer le code de barre en document PDF en forme vectorielle?L'exemple:
[VB.NET]
' Important: You need Vintasoft.Barcode.dll, Vintasoft.Imaging.dll, Vintasoft.Pdf.dll assemblies to run this code.
Private Shared Sub MarkPDF(ByVal pdfFilename As String)
' create barcodeWriter
Dim barcodeWriter As New BarcodeWriter()
' using DataMatrix 2D barcode
barcodeWriter.Settings.Barcode = BarcodeType.Code128
' barcode padding
Dim padding As Single = 5
' open PDF document
Dim document As New PdfDocument(pdfFilename)
' foreach pages
For i As Integer = 0 To document.Pages.Count - 1
Dim page As PdfPage = document.Pages(i)
' barcode value - page number
barcodeWriter.Settings.Value = (i + 1).ToString()
' write barcode graphics path
Dim barcodePath As GraphicsPath = barcodeWriter.GetBarcodeAsGraphicsPath()
' translate barcode to right-bottom page corner
Using m As New Matrix()
Dim barcodeWidth As Single = barcodePath.GetBounds().Width
m.Translate(page.MediaBox.Right - barcodeWidth - padding, padding)
barcodePath.Transform(m)
End Using
' fill barcode path
Using g As PdfGraphics = page.GetGraphics()
Dim brush As New PdfBrush(Color.Black)
g.FillPath(brush, barcodePath)
End Using
barcodePath.Dispose()
Next
' saving document
Dim resultFileName As String = Path.GetFileNameWithoutExtension(pdfFilename) & "_marked.pdf"
document.Save(Path.Combine(Path.GetDirectoryName(pdfFilename), resultFileName))
' free resources
document.Dispose()
End Sub
[C#]
// Important: You need Vintasoft.Barcode.dll, Vintasoft.Imaging.dll, Vintasoft.Pdf.dll assemblies to run this code.
static void MarkPDF(string pdfFilename)
{
// create barcodeWriter
BarcodeWriter barcodeWriter = new BarcodeWriter();
// using DataMatrix 2D barcode
barcodeWriter.Settings.Barcode = BarcodeType.DataMatrix;
// barcode padding
float padding = 5;
// open PDF document
PdfDocument document = new PdfDocument(pdfFilename);
// foreach pages
for (int i = 0; i < document.Pages.Count; i++)
{
PdfPage page = document.Pages[i];
// barcode value - page number
barcodeWriter.Settings.Value = (i + 1).ToString();
// write barcode graphics path
GraphicsPath barcodePath = barcodeWriter.GetBarcodeAsGraphicsPath();
// translate barcode to right-bottom page corner
using (Matrix m = new Matrix())
{
float barcodeWidth = barcodePath.GetBounds().Width;
m.Translate(page.MediaBox.Right - barcodeWidth - padding, padding);
barcodePath.Transform(m);
}
// fill barcode path
using (PdfGraphics g = page.GetGraphics())
{
PdfBrush brush = new PdfBrush(Color.Black);
g.FillPath(brush, barcodePath);
}
barcodePath.Dispose();
}
// saving document
string resultFileName = Path.GetFileNameWithoutExtension(pdfFilename) + "_marked.pdf";
document.Save(Path.Combine(Path.GetDirectoryName(pdfFilename), resultFileName));
// free resources
document.Dispose();
}
Comment puis-je utiliser mon contrôle(checksum) dans le lecteur/écrivain de code barres?Vous devez utiliser la propriété ReaderSettings.VerifyBarcodeMethod pour la vérification du code de barre (de sa somme de contrôle). Voila l’exemple du code qui montre comment créer et reconnaître Code 39 le code de barre avec la somme de contrôle par le module 1000:
[VB.NET]
' Generate checksum at base 1000.
Private Shared Function GenerateChecksum(ByVal value As String) As String
Dim checkSum As Integer = 0
For i As Integer = 0 To value.Length - 1
checkSum += CByte(AscW(value(i))) * i
checkSum = checkSum Mod 1000
Next
'result - [000..999]
Return checkSum.ToString().PadLeft(3, "0"c)
End Function
' Testing Checksum in barcode value.
Private Shared Function TestChecksum(ByVal barcodeValue As String) As Boolean
Dim value As String = barcodeValue.Substring(0, barcodeValue.Length - 3)
Dim readChecksum As String = barcodeValue.Substring(barcodeValue.Length - 3)
Return readChecksum = GenerateChecksum(value)
End Function
' Verify barcode method.
Private Shared Sub VerifyBarcodeMethod(ByVal reader As BarcodeReader, ByVal barcodeInfo As IBarcodeInfo)
If TestChecksum(barcodeInfo.Value) Then
barcodeInfo.Confidence = 100
Else
barcodeInfo.Confidence = 0
End If
End Sub
Private Shared Sub TestCode39Barcode(ByVal value As String)
' create writer
Dim writer As New BarcodeWriter()
writer.Settings.Barcode = BarcodeType.Code39
' create reader
Dim reader As New BarcodeReader()
reader.Settings.ScanBarcodeTypes = BarcodeType.Code39
reader.Settings.MinConfidence = 100
reader.Settings.AutomaticRecognition = True
reader.Settings.ExpectedBarcodes = 1
' write barcode without checksum
writer.Settings.Value = value
Dim barcodeNoChecksumImage As Image = writer.GetBarcodeAsBitmap()
' write barcode with checksum
writer.Settings.Value = value & GenerateChecksum(value)
Dim barcodeWithMyChecksumImage As Image = writer.GetBarcodeAsBitmap()
'set VerifyBarcodeMethod
reader.Settings.VerifyBarcodeMethod = AddressOf VerifyBarcodeMethod
Dim infos As IBarcodeInfo()
'read barcodes from barcode image without checksum
'no barcodes found
infos = reader.readBarcodes(barcodeNoChecksumImage)
Console.WriteLine("Scan (NoChecksum):")
For i As Integer = 0 To infos.Length - 1
Console.WriteLine(infos(i).Value)
Next
'read barcodes from barcode image with checksum
'found one barcode
infos = reader.readBarcodes(barcodeWithMyChecksumImage)
Console.WriteLine("Scan (MyChecksum):")
For i As Integer = 0 To infos.Length - 1
Console.WriteLine(infos(i).Value)
Next
End Sub
[C#]
// Generate checksum at base 1000.
static string GenerateChecksum(string value)
{
int checkSum = 0;
for (int i = 0; i < value.Length; i++)
{
checkSum += ((byte)value[i]) * i;
checkSum %= 1000;
}
//result - [000..999]
return checkSum.ToString().PadLeft(3, '0');
}
// Testing Checksum in barcode value.
static bool TestChecksum(string barcodeValue)
{
string value = barcodeValue.Substring(0, barcodeValue.Length - 3);
string readChecksum = barcodeValue.Substring(barcodeValue.Length - 3);
return readChecksum == GenerateChecksum(value);
}
// Verify barcode method.
static void VerifyBarcodeMethod(BarcodeReader reader, IBarcodeInfo barcodeInfo)
{
if (TestChecksum(barcodeInfo.Value))
barcodeInfo.Confidence = 100;
else
barcodeInfo.Confidence = 0;
}
static void TestCode39Barcode(string value)
{
// create writer
BarcodeWriter writer = new BarcodeWriter();
writer.Settings.Barcode = BarcodeType.Code39;
// create reader
BarcodeReader reader = new BarcodeReader();
reader.Settings.ScanBarcodeTypes = BarcodeType.Code39;
reader.Settings.MinConfidence = 100;
reader.Settings.AutomaticRecognition = true;
reader.Settings.ExpectedBarcodes = 1;
// write barcode without checksum
writer.Settings.Value = value;
Image barcodeNoChecksumImage = writer.GetBarcodeAsBitmap();
// write barcode with checksum
writer.Settings.Value = value + GenerateChecksum(value);
Image barcodeWithMyChecksumImage = writer.GetBarcodeAsBitmap();
//set VerifyBarcodeMethod
reader.Settings.VerifyBarcodeMethod = VerifyBarcodeMethod;
IBarcodeInfo[] infos;
//read barcodes from barcode image without checksum
//no barcodes found
infos = reader.ReadBarcodes(barcodeNoChecksumImage);
Console.WriteLine("Scan (NoChecksum):");
for (int i = 0; i < infos.Length; i++)
Console.WriteLine(infos[i].Value);
//read barcodes from barcode image with checksum
//found one barcode
infos = reader.ReadBarcodes(barcodeWithMyChecksumImage);
Console.WriteLine("Scan (MyChecksum):");
for (int i = 0; i < infos.Length; i++)
Console.WriteLine(infos[i].Value);
}
Comment puis-je dessiner un code de barre avec la dimension et résolution donnée (DPI)?
[VB.NET]
Private Shared Function DrawBarcode(ByVal barcode As BarcodeType, ByVal value As String, ByVal resolution As Single, _
ByVal width As Single, ByVal height As Single, ByVal units As UnitOfMeasure) As Image
Dim writer As New BarcodeWriter()
writer.Settings.Barcode = barcode
writer.Settings.Value = value
writer.Settings.Resolution = resolution
writer.Settings.SetWidth(width, units)
writer.Settings.SetHeight(height, units)
Return writer.GetBarcodeAsBitmap()
End Function
Private Shared Sub TestDrawBarcode(ByVal fileName As String)
' Draw barcode 6x2 cm in 600 DPI
Dim barcodeImage As Image = DrawBarcode(BarcodeType.Code128, "TESTBARCODE", 600, 6, 2, UnitOfMeasure.Centimeters)
barcodeImage.Save(fileName)
barcodeImage.Dispose()
End Sub
[C#]
static Image DrawBarcode(BarcodeType barcode, string value, float resolution, float width, float height, UnitOfMeasure units)
{
BarcodeWriter writer = new BarcodeWriter();
writer.Settings.Barcode = barcode;
writer.Settings.Value = value;
writer.Settings.Resolution = resolution;
writer.Settings.SetWidth(width, units);
writer.Settings.SetHeight(height, units);
return writer.GetBarcodeAsBitmap();
}
static void TestDrawBarcode(string fileName)
{
// Draw barcode 6x2 cm in 600 DPI
Image barcodeImage = DrawBarcode(BarcodeType.Code128, "TESTBARCODE", 600, 6, 2, UnitOfMeasure.Centimeters);
barcodeImage.Save(fileName);
barcodeImage.Dispose();
}
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