[英]Error: can only iterate over an array or an instance of java.lang.Iterable
please help me with my error can't seem to make it work because of that can only iterate over an array or an instance of java.lang.Iterable. 请帮助我,我的错误似乎无法使其工作,因为它只能迭代数组或java.lang.Iterable的实例。 i want to create a barcode and read it and add it to the word document
我想创建一个条形码并阅读它并将其添加到word文档中
Update Post the nodeCollection is from the com.aspose.words. 更新发布 nodeCollection来自com.aspose.words。
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.");
}
}}
Error: can only iterate over an array or an instance of java.lang.Iterable
错误:只能遍历数组或java.lang.Iterable的实例
It clearly says that you should iterate only on objects which are iterable. 它清楚地表明你应该只迭代可迭代的对象。
In your code you are using 在您使用的代码中
NodeCollection<Shape> shapes = doc.getChildNodes(NodeType.SHAPE, true, false);
...
for(Shape shape: shapes)
The for
loop fails unless the shapes
base class is an instance of a java.util.Collection
or java.lang.Iterable
. 除非
shapes
基类是java.util.Collection
或java.lang.Iterable
的实例,否则for
循环失败。
Check if NodeCollection
is a collection type class that implemented java.lang.Iterable
. 检查
NodeCollection
是否是实现java.lang.Iterable
的集合类型类。
Edit : 编辑 :
the nodeCollection is from the com.aspose.words.
nodeCollection来自com.aspose.words。
NodeCollection
implements generic Iterable
directly, without specifying the type of objects it would be handling. NodeCollection
直接实现泛型Iterable
,而不指定它将处理的对象的类型。 Hence you should explicitly generate the Iterator
from the NodeCollection
instance and on that you can iterate. 因此,您应该从
NodeCollection
实例显式生成Iterator
,然后您可以迭代。
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 to a similar answer on so 请参阅 类似的答案
I assume Nodecollection is a com.aspose.words.NodeCollection. 我假设Nodecollection是一个com.aspose.words.NodeCollection。
If you want to use the foreach syntax you better do: 如果您想使用foreach语法,最好:
Node[] shapesArray = shapes.toArray();
for (Node node : shapesArray ){ ...
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