Creating a .jpg image from with in the J2ME app

Question

Hi,
I want to send a document to the printer over bluetooth to print.
For that I searched on net, but couldn't find any APIs supported by J2ME to print it. I also found a link http://www.hcilab.org/documents/tutorials/Brother/ where I found that I can send the data by creating an image and then writing data (text or image ) in to it, and then sending that image to print.
Image img = Image.createImage(816, 40);
Graphics g = img.getGraphics();
g.setColor(0, 0, 0);
g.setFont(Font.getFont(Font.FACE_PROPORTIONAL, Font.STYLE_BOLD,Font.SIZE_LARGE));
g.drawString("Printing test from "
                         + System.getProperty("microedition.platform") + " on "
                         + new Date(), 10, 10, 0);
driver.print(img, btAddr);This code is working fine on this printer.
I am using HP 460cb printer, and I tried the same thing, but am not getting any results. Can any one of you tell me what mistake am I making.
                Image blankImage = Image.createImage(SpotBilling.MAX_IMG_WIDTH, SpotBilling.MAX_IMG_HEIGHT);
                Graphics g = blankImage.getGraphics();
                g.setColor(0,0,0);
                g.setFont(Font.getFont(Font.FACE_PROPORTIONAL, Font.STYLE_PLAIN, Font.SIZE_SMALL));
                g.drawString("Printing test on Wednesday - 18th Jan, 2006", 10, 50, Graphics.TOP|Graphics.LEFT);
                g.drawImage(imgTest, 60, 150, Graphics.HCENTER | Graphics.VCENTER);
                int width = blankImage.getWidth();
                int height = blankImage.getHeight();
                int y = 0;
                os.write(CMD_UNIVERSAL_EXIT);
                for(int i = 1; i<=height; i++){
                         blankImage.getRGB(temp, 0, width, 0, y, width, 1);
                         byte[] pixels = new byte[width];
                         for (int x = 0; x < temp.length; x++) {
                              pixels[x] = (byte) ((((temp[x] & 0x00FF0000) >> 16)
                                   + ((temp[x] & 0x0000FF00) >> 8) + (temp[x] & 0x000000FF)) / 3);
                         // Transfer Raster Graphics
                         os.write(TRANSFER_RASTER_DATA);
                         byte[] len = numToDecimal(pixels.length);
                         os.write(len);
                         os.write(DATA);
                         os.write(pixels);
                         y++;
                    }I have another query, if I can not do this. Is there any way I can create a .jpg image from with in the J2ME application.
I have some text and an image that I get by invoking camera from the code and then capturing a picture. I need to combine them both, and then send it to the printer.
If there is any way, I can convert this blankImage mentioned above (containing both text and Image), please provide me the solution.
Any document or any source code is appreciated.
regards,
Ashish

Answer 1

I have succeeded in creating a mutable image that contains text and image (.png), through
                     Image img;
                     img = Image.createImage(50, 60);
     protected void paint(Graphics g){
          g.drawImage(img, getWidth()/2, getHeight()/2, Graphics.HCENTER | Graphics.VCENTER);
          Graphics graph = img.getGraphics();
          graph.setColor(0, 0, 0);
          graph.setFont(Font.getFont(Font.FACE_PROPORTIONAL, Font.STYLE_BOLD,
                         Font.SIZE_LARGE));
          graph.drawString("Printing test from "
                                   + System.getProperty("microedition.platform") + " on ", 10, 10, 0);
          graph.drawImage(image, img.getWidth()/2, img.getHeight()/2,Graphics.HCENTER|Graphics.VCENTER);
          graph.fillArc(0,0,10,10,0, 360);
     }Now I want to create a .jpg image of this img image(Mutable image).
What I am doing is that,
1. I am converting this image in to int array, using getRGB() method.
2. Then I am converting int array in to byte array.
3. And then I am opening a file(extension is .jpg)
4. Then I am sending this byte array in to the file which is .jpg
The .jpg file is getting created, but the data in it is very absurd, like yyyyyyyyyyyyyyyyyyyyyyyy.
Please help me in this matter.
Regards,
Ashish