HTTP CONNECTION PROBLEM

[jennieanxa]

Hello,

I am having problem downloading a text file vile htto connection.
I am the source code below to downloand the file and it is working well in any emulator and on the motorola razor phone.

But when i tried testing them on a nokia 3220 phone(ser 40), is throwingthis exception:

java.io.ioException: error in http operation

it is throwing exception on this line

is = c.openInputStream();

when i tried adding a get response code

int rc = c.getResponseCode();

it throws the exception in this line

Below is my source code:

/*********************source code***************** */
public String getDataFromUrl(String url) //throws IOException
{
int rc=0;
try{
StringBuffer b = new StringBuffer();
InputStream is = null;
HttpConnection c = null;
c = (HttpConnection)Connector.open(url);
// Getting the response code will open the connection,
// send the request, and read the HTTP response headers.
// The headers are stored until requested.
is = c.openInputStream();
// Get the ContentType
String type = c.getType();
// Get the length and process the data
int len = (int)c.getLength();
if (len > 0) {
byte[] raw = new byte[len];
int length = is.read(raw);
b = new StringBuffer(new String(raw,0,length));
}else {
int ch;
while ((ch = is.read()) != -1)
{
len = is.available() ;
b.append((char)ch);
}
}
is.close();
return b.toString();
}catch(Exception e){
return null;
}
}

[dcrocha]

Hi,

Couple of observations:

1) Are you using an Internet Access Point, instead of a WAP one?
2) Your code has some inconsistencies:

if (len > 0) {
byte[] raw = new byte[len];
int length = is.read(raw); // THIS IS NOT GUARANTEED TO WORK, THE READ METHOD MAY OR MAY NOT READ THE ENTIRE FILE. THE ONLY GUARANTEED METHOD IS DATAINPUTSTREAM.READFULLY
b = new StringBuffer(new String(raw,0,length));

len = is.available() ;// you keep calling this every time in the "else" clause. No need.

Lastly, you call close() before returning the value. You should do it withing the "finally" clause.

Daniel

[Jason Glass]

dont you also have to sometimes get response code, before opening input stream? so as to flush the headers and create connection?

[dcrocha]

Yes, it is also a good practice to get the response codes, so you can flush the headers and catch errors such as 500 (very frequent), 404, 403, etc.

Daniel

[ph0en1x]

I'm getting an error code 403. How do I catch that error and flush the headers?

[Jason Glass]

figure it out phoenix?

[jaceline]

At every Http connection, please check the response by adding this at every http connection.

int respcode = connection.getResponseCode();
if (respcode != HttpConnection.HTTP_OK)
{
mStat = new Alert("Error", "Error code:"+respcode, null, AlertType.INFO);
mStat.setTimeout(Alert.FOREVER);
disp.setCurrent(alStatus);
}
else
{
}

Regards,
Jac

[Jason Glass]

jaceline

also when porting code amongst manufacturers, I have found now that does not always work, if you connect through a wrong wap gatewy, sometimes you get 200, but then, when you try to use the connection, you get an exception

seems to happen more often if the WAP gateway is involved, as compared to explicitly in code not specifying a wap gateway, and in the case of https

Just FYI, as it gave me a headache

[jaceline]

Just make sure you insert the try-catch to catch the exception error. It will not be our fault for having the exception error.Just make sure everything is properly controlled and not stuck without knowing the exception