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Java Forum / General / May 2007Image from byte[]
Hello, I have a byte[]img (constructed from an actual .bmp image) and want to use it to make an object of type Image, not to display it but apply to it getPixels(). I know the width and height. I've tried various things without success. I'd be most grateful for a simple solution. > Hello, I have a byte[]img (constructed from an actual .bmp image) > and want to use it to make an object of type Image, not to display > it but apply to it getPixels(). I know the width and height. > I've tried various things without success. I'd be most grateful for a > simple solution. Have you tried: javax.imageio.ImageIO.read(new java.io.ByteArrayInputStream(yourByteArray);  SignatureMike W >> Hello, I have a byte[]img (constructed from an actual .bmp image) >> and want to use it to make an object of type Image, not to display [quoted text clipped - 5 lines] > > javax.imageio.ImageIO.read(new java.io.ByteArrayInputStream(yourByteArray); or Toolkit.createImage(byte[] imagedata) SignatureKnute Johnson email s/nospam/knute/ >>> Hello, I have a byte[]img (constructed from an actual .bmp image) >>> and want to use it to make an object of type Image, not to display [quoted text clipped - 9 lines] > > Toolkit.createImage(byte[] imagedata) Hello Knute, this gives error: cannot be referenced from static context. Ivan Knute Johnson wrote: >> Toolkit.createImage(byte[] imagedata) > Hello Knute, this gives error: cannot be referenced from static context. Your response to Knute's suggestion is rather surreal. You show no code and did not quote the error message, so I will make some guesses absent that crucial information: Toolkit is a class, and createImage() a static method, so that cannot be the problem. Therefore, assuming the quoted line is where the error occurs, the compiler must be barfing over imagedata. (A better name would be imageData, btw.) That means that imagedata must be a non-static variable, and you must be calling Toolkit from a static method (main(), perhaps?). These errors have nothing to do with the value of Knute's suggestion. Fix your bugs and try again. SignatureLew > Knute Johnson wrote: >>> Toolkit.createImage(byte[] imagedata) [quoted text clipped - 15 lines] > > Fix your bugs and try again. Hello, I have this: Image img; void applytexture(byte[]texture,etc){ bla-bla; img= Toolkit.createImage(texture); etc } javac gives: non-static method createImage(byte[]) cannot be referenced from a static context img=Toolkit.createImage(texture); ^ I've got nothing static. Thanks for your interest. Ivan Lew wrote: >> You show no code and did not quote the error message, so I will make some >> guesses absent that crucial information: >> Toolkit is a class, and createImage() a static method, I was wrong. That's what I get for guessing. <http://java.sun.com/javase/6/docs/api/java/awt/Toolkit.html#createImage(java.lan g.String)> Of course, I would not have made this wrong guess if you had provided the error message in the first place. >> These errors have nothing to do with the value of Knute's suggestion. >> >> Fix your bugs and try again. Here I was not wrong. > Hello, I have this: > Image img; > void applytexture(byte[]texture,etc){ > bla-bla; "Bla-bla" is not good for an SSCCE, since it doesn't compile, but it didn't matter this time. > img= > Toolkit.createImage(texture); [quoted text clipped - 7 lines] > > I've got nothing static. Yes, you do. The call to createImage() is made through a static context, but it's not a static method. Ergo, error. Whenever you call a method just through the class name it's a static call. Since the method is not declared static, you got an error. Read the Javadoc on the method. Invoke it through an instance of Toolkit. <http://java.sun.com/javase/6/docs/api/java/awt/Component.html#getToolkit()> SignatureLew Lew wrote: >> You show no code and did not quote the error message, so I will make some guesses absent that crucial information: >> Toolkit is a class, and createImage() a static method, I was wrong. That's what I get for guessing. <http://java.sun.com/javase/6/docs/api/java/awt/Toolkit.html#createImage(java.lan g.String)> Of course, I would not have made this wrong guess if you had provided the error message in the first place. >> These errors have nothing to do with the value of Knute's suggestion. >> >> Fix your bugs and try again. Here I was not wrong. > Hello, I have this: > Image img; > void applytexture(byte[]texture,etc){ > bla-bla; "Bla-bla" is not good for an SSCCE, since it doesn't compile, but it didn't matter this time. > img= Toolkit.createImage(texture); > etc [quoted text clipped - 4 lines] > ^ > I've got nothing static. Yes, you do. The call to createImage() is made through a static context, but it's not a static method. Ergo, error. Whenever you call a method just through the class name it's a static call. Since the method is not declared static, you got an error. Read the Javadoc on the method. Invoke it through an instance of Toolkit. <http://java.sun.com/javase/6/docs/api/java/awt/Component.html#getToolkit()> SignatureLew >> Hello, I have a byte[]img (constructed from an actual .bmp image) >> and want to use it to make an object of type Image, not to display [quoted text clipped - 5 lines] > > javax.imageio.ImageIO.read(new java.io.ByteArrayInputStream(yourByteArray); Hello Mike, this worked fine. Thanks very much. Ivan >Hello, I have a byte[]img (constructed from an actual .bmp image) >and want to use it to make an object of type Image, not to display Here is a simple example how to paint into an int array and then create a BufferedImage object from it. This image then is saved as a jpeg image. WARNING: A file »generated.jpg« will be o v e r w r i t t e n by the process. public class Main { public static void main ( final java.lang.String[] args ) { int width = 800; int height = 600; int[] target = new int[ width * height ]; for( int y = 0; y < height; y++ ) { for( int x = 0; x < width; x++ ) { target[ x + y * width ]=( x )% 255 +(( y )% 255 )* 256; }} java.awt.image.BufferedImage output = new java.awt.image.BufferedImage ( width, height, java.awt.image.BufferedImage.TYPE_INT_RGB ); output.setRGB( 0, 0, width, height, target, 0, width ); java.io.BufferedOutputStream out = null; try { out = new java.io.BufferedOutputStream ( new java.io.FileOutputStream( "generated.jpg" )); } catch( final java.io.FileNotFoundException fileNotFoundException ) { throw new java.lang.RuntimeException( fileNotFoundException ); } com.sun.image.codec.jpeg.JPEGImageEncoder encoder = com.sun.image.codec.jpeg.JPEGCodec.createJPEGEncoder( out ); com.sun.image.codec.jpeg.JPEGEncodeParam param = encoder.getDefaultJPEGEncodeParam( output ); param.setQuality( 1.0f, false); encoder.setJPEGEncodeParam( param ); try { encoder.encode( output ); out.close(); } catch( final java.io.IOException ioException ) { throw new java.lang.RuntimeException( ioException ); }}} Free MagazinesGet these publications absolutely FREE for up to 12 months. 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