在本文中,我们将讲解如何使用Aspose.BarCode for .NET 和 Aspose.Pdf for .NET从Pdf文档中识别条码。
步骤如下:
1 使用 Aspose.Pdf for .NET从Pdf文档中提取图像
2 以流的形式保存提取的图像
3 将图像以流的形式传递到Aspose.BarCode for .NET
4 从图像中读取条码
C#
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try
{
// set the license for Aspose.BarCode for .NET and Aspose.Pdf for .NET components
Aspose.BarCodeRecognition.License licenceBarCodeRecognition =
new
Aspose.BarCodeRecognition.License();
licenceBarCodeRecognition.SetLicense(
@"Aspose.Total.Product.Family.lic"
);
Aspose.Pdf.License licensePdf =
new
Aspose.Pdf.License();
licensePdf.SetLicense(
@"Aspose.Total.Product.Family.lic"
);
// bind the pdf document
Aspose.Pdf.Facades.PdfExtractor pdfExtractor =
new
Aspose.Pdf.Facades.PdfExtractor();
pdfExtractor.BindPdf(
@"document.pdf"
);
// set page range for image extraction
pdfExtractor.StartPage = 1;
pdfExtractor.EndPage = 1;
// extract the images
Console.WriteLine(
"Extracting images....."
);
pdfExtractor.ExtractImage();
// save images to stream in a loop
while
(pdfExtractor.HasNextImage())
{
Console.WriteLine(
"Getting next image...."
);
// save image to stream
MemoryStream imageStream =
new
MemoryStream();
pdfExtractor.GetNextImage(imageStream);
imageStream.Position = 0;
Console.WriteLine(
"Recognizing barcode...."
);
// recognize the barcode from the image stream above
Aspose.BarCodeRecognition.BarCodeReader barcodeReader =
new
Aspose.BarCodeRecognition.BarCodeReader(imageStream, BarCodeReadType.Code39Standard);
while
(barcodeReader.Read())
{
Console.WriteLine(
"Codetext found: "
+ barcodeReader.GetCodeText() +
", Symbology: "
+ barcodeReader.GetReadType().ToString());
}
// close the reader
barcodeReader.Close();
}
}
catch
(Exception ex)
{
Console.WriteLine(ex.Message);
}
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[VB.NET]
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Try
' set the license for Aspose.BarCode for .NET and Aspose.Pdf for .NET components
Dim
licenceBarCodeRecognition
As
New
Aspose.BarCodeRecognition.License()
licenceBarCodeRecognition.SetLicense(
"Aspose.Total.Product.Family.lic"
)
Dim
licensePdf
As
New
Aspose.Pdf.License()
licensePdf.SetLicense(
"Aspose.Total.Product.Family.lic"
)
' bind the pdf document
Dim
pdfExtractor
As
New
Aspose.Pdf.Facades.PdfExtractor()
pdfExtractor.BindPdf(
"docuemnt.pdf"
)
' set page range for image extraction
pdfExtractor.StartPage = 1
pdfExtractor.EndPage = 1
' extract the images
Console.WriteLine(
"Extracting images....."
)
pdfExtractor.ExtractImage()
' save images to stream in a loop
Do
While
pdfExtractor.HasNextImage()
Console.WriteLine(
"Getting next image...."
)
' save image to stream
Dim
imageStream
As
New
MemoryStream()
pdfExtractor.GetNextImage(imageStream)
imageStream.Position = 0
Console.WriteLine(
"Recognizing barcode...."
)
' recognize the barcode from the image stream above
Dim
barcodeReader
As
New
Aspose.BarCodeRecognition.BarCodeReader(imageStream, BarCodeReadType.Code39Standard)
Do
While
barcodeReader.Read()
Console.WriteLine(
"Codetext found: "
& barcodeReader.GetCodeText() &
", Symbology: "
& barcodeReader.GetReadType().ToString())
Loop
' close the reader
barcodeReader.Close()
Loop
Catch
ex
As
Exception
Console.WriteLine(ex.Message)
End
Try
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