Java error creating BufferedImage from ByteArrayInputStream

Question

I'm trying to create a BufferedImage from a ByteArrayInputStream with:

  byte[] imageData = getData(imageFile); // returns file as byte[]

  InputStream inputStream = new ByteArrayInputStream(imageData);
  String format = getFormatName(inputStream);

  BufferedImage img = ImageIO.read(inputStream);

But img is always null. The input stream is valid (since I use it before to get the image format). What could be making ImageIO return null? Do I need to use flush or close in any place?

mhaller · Accepted Answer · 2010-12-27 13:03:34Z

5

Your call to getFormatName consumes the inputStream, so the stream pointer is at the end of the byte array. Any try to read from that stream will tell that it's at the end of the 'file'. You need to reset the stream (or create a new one) before you hand it over to the ImageIO.read() method:

String format = getFormatName(new ByteArrayInputStream(imageData));
BufferedImage img = ImageIO.read(new ByteArrayInputStream(imageData));

answered Dec 27, 2010 at 13:03

mhaller

14.2k2 gold badges44 silver badges62 bronze badges

Sign up to request clarification or add additional context in comments.

Collectives™ on Stack Overflow

Java error creating BufferedImage from ByteArrayInputStream

1 Answer 1

Comments

Your Answer

Hot Network Questions

Collectives™ on Stack Overflow

1 Answer 1

Comments

Your Answer

Sign up or log in

Post as a guest

Related