Home/ Questions/Simple solutions for the can only iterate over an array or an instance of java.lang.iterable error
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Brianna Anderson
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Asked: 2022-05-18T16:34:57+00:00 In:

Simple solutions for the can only iterate over an array or an instance of java.lang.iterable error

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I’m trying to run a new project. I do a couple of things like this:

import com.aspose.barcode.*;
 import com.aspose.barcoderecognition.BarCodeReadType;
 import com.aspose.barcoderecognition.BarCodeReader;
 import com.aspose.words.Document;
 import com.aspose.words.DocumentBuilder;
 import com.aspose.words.ImageType;
 import com.aspose.words.NodeCollection;
 import com.aspose.words.NodeType;
 import com.aspose.words.Shape;
 
  try
  {
  // Generate barcode image
  BarCodeBuilder builder = new BarCodeBuilder();
  builder.setSymbologyType(Symbology.Code39Standard);
  builder.setCodeText("test-123");
  String strBarCodeImageSave = "img.jpg";
  builder.save(strBarCodeImageSave);
 
  // Add the image to a Word doc
  Document doc = new Document();
  DocumentBuilder docBuilder = new DocumentBuilder(doc);
  docBuilder.insertImage(strBarCodeImageSave);
  String strWordFile = "docout.doc";
  doc.save(strWordFile);
 
  // Recognition part
  // Extract image from the Word document
  NodeCollection<Shape> shapes = doc.getChildNodes(NodeType.SHAPE, true, false);
  int imageIndex = 0;
 
  for(Shape shape: shapes)
  { 
  if (shape.hasImage())
  {
  // If this shape is an image, extract image to file
  String extension = ImageTypeToExtension(shape.getImageData().getImageType());
  String imageFileName = MessageFormat.format("Image.ExportImages.{0} Out.{1}", imageIndex, extension);
  String strBarCodeImageExtracted = "" + imageFileName;
  shape.getImageData().save(strBarCodeImageExtracted);
 
  // Recognize barcode from this image
  BarCodeReader reader = new BarCodeReader((BufferedImage) Toolkit.getDefaultToolkit().getImage(strBarCodeImageExtracted),BarCodeReadType.Code39Standard);
  while (reader.read())
  {
  System.out.println("codetext: " + reader.getCodeText());
  }
  imageIndex++;
  }
  }
  }
  catch(Exception ex)
  {
  System.out.println(ex.getMessage());
  }
  }
 
  private static String ImageTypeToExtension(int imageType) throws Exception
  {
  switch (imageType)
  {
  case ImageType.BMP:
  return "bmp";
  case ImageType.EMF:
  return "emf";
  case ImageType.JPEG:
  return "jpeg";
  case ImageType.PICT:
  return "pict";
  case ImageType.PNG:
  return "png";
  case ImageType.WMF:
  return "wmf";
  default:
  throw new Exception("Unknown image type.");
  }
  }}

But in my program, I am getting the warning:

Error: can only iterate over an array or an instance of java.lang.Iterable

Can someone explain why the “ can only iterate over an array or an instance of java.lang.iterable” issue happened? Where have I gone wrong? Thank you!

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2 Answers

  1. Best Answer
    Expert

    The cause: This warning expressly states that you should iterate on iterable objects.

    The solution: I assume Nodecollection is probably a com.aspose.words.NodeCollection. If you want to use the foreach syntax, you should do the following:

    Node[] shapesArray = shapes.toArray();
for (Node node : shapesArray ){ ...
    • 10

  2. Error: can only iterate over an array or an instance of java.lang.Iterable

    It is clear that it says you should only iterate on iterable objects.

    You are using a code 

    NodeCollection<Shape> shapes = doc.getChildNodes(NodeType.SHAPE, true, false);
... 
for(Shape shape: shapes)

    If the shapes base classes is an instance java.util.Collection, or java.lang.Iterable, then the for loop will fail.

    You can check if NodeCollection has a collection class that implemented java.lang.Iterable.

    Edit:

    the nodeCollection is from the com.aspose.words.

    NodeCollection implements generic Iterable directly without specifying which objects it would be handling. You should therefore generate the Iterator explicitly from the NodeCollection instance, and then iterate. 

    NodeCollection<Shape> shapes = doc.getChildNodes(NodeType.SHAPE, true, false);
Iterator<Shape> shapesIterator = shapes.iterator();
... 
// now use the above iterator in for loop, as below
for( Shape shape: shapesIterator )

    Refer for a similar answer so

    • 19

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