png and jpg

[simonesec]

I have a problem...i get a jpg image from Internet and then i try to show it in a canvas.
Off course this method don't work!
I think that the problem is in the metodh drawImage that don't support the jpg format.

Anyone can tell me how to get a solution for my problem?

It's possible to convert jpg to png?

[simonesec]

the code I used is this....




import java.io.*;
import javax.microedition.io.*;
import javax.microedition.lcdui.Image;
import javax.microedition.rms.*;

public class Connessione extends Thread {
ContentConnection c = null;
InputStream iStrm=null;
String url="";
//byte imageData[];
MyCanvas can=null;
WBL m=null;
Image im=null;

public Connessione(MyCanvas c,String str,WBL ma){
if(str.length()>0){
url=str;
}else{
url="http://www.abc.com/test.jpg";
}
can=c;
m=ma;
}

public void run(){
System.out.println("run");
try{
c = (ContentConnection)Connector.open(url);
iStrm = c.openInputStream();
im = Image.createImage(iStrm);
} catch(Exception e){
System.out.println("errore connesione al web:"+e);
}

try{
c.close();
}catch( Exception e){
System.out.println("ecc");
}
System.out.println("Fine caricamento");
//m.al.setTimeout(9900);
//m.attendi(1);
can.CreaImm(im);

}

}


in this way the size of the image is 0...
i tried also to use this method=>
import java.io.*;
import javax.microedition.io.*;
import javax.microedition.rms.*;

public class Connessione extends Thread {
ContentConnection c = null;
DataInputStream iStrm=null;
String url="";
byte imageData[];
MyCanvas can=null;
main m=null;

public Connessione(MyCanvas c,String str,main ma){
if(str.length()>0){
url=str;
}else{
url="http://www.lanponet.it/allarm.jpg";
}
can=c;
m=ma;
}

public void run(){

try{
c = (ContentConnection)Connector.open(url);
iStrm = c.openDataInputStream();
}
catch(Exception e){
System.out.println("errore connesione al web:"+e);
}

try{
int length = (int) c.getLength();
imageData = new byte[length];
iStrm.readFully(imageData);
}
catch(Exception e){
System.out.println("errore lettura immagine da web:"+e);
}


try{
RecordStore rs = RecordStore.openRecordStore("immagini3", true );
System.out.println(rs.getNumRecords());
if(rs.getNumRecords()>0)
{
rs.setRecord(1,imageData,0,imageData.length);
System.out.println("set");
}
else
{
rs.addRecord(imageData,0,imageData.length);
System.out.println("add");
}
System.out.println("Dim da memorizzare:"+imageData.length);
rs.closeRecordStore();
}
catch(Exception e){
System.out.println("Errore salvataggio:"+e);
}

try{
c.close();
}catch( Exception e){
}
m.al.setTimeout(100000);
m.attendi(1);
can.CreaImm();
}

}
...
...
...
...
...
...
public void CreaImm(){
try{

RecordStore rs = RecordStore.openRecordStore("immagini3", true );
imageData=new byte[rs.getRecordSize(1)];
rs.getRecord(1,imageData,0);
rs.closeRecordStore();
}
catch(Exception e){
System.out.println("Errore lettura da memoria:"+e.toString());
}

try {
System.out.println("Dim da visualizzare:"+imageData.length);
im = Image.createImage(imageData,0,imageData.length);
} catch (Exception e) {
System.err.println("Non riesco a caricare"+e);
}
rimpicciolisci();
}
...
...
..
but in this way it gives me an IllegalArgumentException

[KiwiChriss]

Well, I think the JPEG Format is generally supported... I never had problems drawing a JPEG. Why don't u use the createImage("/.../yourJPEG.jpg") method to create it?

[simonesec]

The method createImage("/.../yourJPEG.jpg") is ok, the problem is that the image i have to use for my application is on a LAN network or on internet and to get it i have to use an httpConnetction or something similar, and then put the byte of the image into an array ...in that way my prog don't work.