在本文中,我們將講解如何使用Aspose.BarCode for .NET 和 Aspose.Pdf for .NET從Pdf文檔中識別條碼。
步驟如下:
1 使用 Aspose.Pdf for .NET從Pdf文檔中提取圖像
2 以流的形式保存提取的圖像
3 將圖像以流的形式傳遞到Aspose.BarCode for .NET
4 從圖像中讀取條碼
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);
} |
[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()
LoopCatch
ex As Exception
Console.WriteLine(ex.Message)
End
Try |
