I have a pdf files that have many pages (1000 +) each page as a barcode that
needs to be read (bitmap 2D data matrix).
This is not a technical problem, I loop through all the image on a page and
scan each one until I find the barcode.
What I’m faced with is performance issue. Instead of checking every image is
there way to get an image base on its location?
Below is how I’m checking the images, I’m checking the location of every
image until I get the one in the location of the barcode. This just seems a
long way to do it.
public class MyImageRenderListener : IRenderListener
{
public void RenderText(TextRenderInfo renderInfo) { }
public void BeginTextBlock() { }
public void EndTextBlock() { }
public List<byte[]> Images = new List<byte[]>();
// public List<string> ImageNames = new List<string>();
private Boolean doExit = false;
public void RenderImage(ImageRenderInfo renderInfo)
{
PdfImageObject image = renderInfo.GetImage();
try
{
if (doExit) return;
var matrix = renderInfo.GetImageCTM();
float left = matrix[6];
float top = matrix[7];
float width = matrix[0];
float height = matrix[4];
image = renderInfo.GetImage();
if (image == null) return;
if (left == 516.0 && top == 18.0)
{
doExit = true;
using (MemoryStream ms = new
MemoryStream(image.GetImageAsBytes()))
{
Images.Add(ms.ToArray());
}
}
}
catch (IOException ie)
{
/*
* pass-through; image type not supported by iText[Sharp];
e.g. jbig2
*/
}
}
}
public string BarScanner(int page)
{
string results = String.Empty;
PdfReaderContentParser parser = new
PdfReaderContentParser(pdfReader);
MyImageRenderListener listener = new MyImageRenderListener();
parser.ProcessContent(page, listener);
for (int i = 0; i < listener.Images.Count; ++i)
{
Stream stream = new MemoryStream(listener.Images[i]);
string[] data = BarcodeScanner.Scan(stream/*,
BarCodeType.DataMatrix*/);
foreach (string bar in data)
{
//Debug.WriteLine("The scanning result is: {0}.", bar);
if (QuickMatch(bar))
{
results = bar;
break;
}
}
if (results.Length > 0) break;
}
return results;
}
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