I wrote the below code to send location coordinates to server:
setTitle("version 5.0");
Criteria criteria = new Criteria();
criteria.setHorizontalAccuracy(Criteria.NO_REQUIREMENT);
criteria.setVerticalAccuracy(Criteria.NO_REQUIREMENT);
criteria.setCostAllowed(true);
criteria.setPreferredPowerConsumption(Criteria.POWER_USAGE_LOW);
// bc.setFailoverMode(GPSInfo.GPS_MODE_ssCDMA_MS_ASSIST, 2, 100);
try {
LocationProvider lp=LocationProvider.getInstance(criteria);
if(lp !=null)
{
Location loc=null;
// while(loc==null)
// {
loc=lp.getLocation(-1);
// }
if(loc!=null){
add(new EditField(loc.getQualifiedCoordinates().getLatitude()+"\n"+loc.getQualifiedCoordinates().getLongitude(),""));
}
else
add(new EditField("unable to find the location provider", ""));
}
else
{
add(new EditField("unable to find the location provider", ""));
}
} catch (LocationException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (Exception e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
ButtonField b = new ButtonField("Send");
add(b);
b.setChangeListener(new FieldChangeListener() {
public void fieldChanged(Field field, int context) {
// TODO Auto-generated method stub
try{
String url="http://56.91.532.72:8084/SFTS/updateLocation.jsp?empid=12304&lat=16.9477&lon=82.23970;deviceside=true";
Dialog.alert(url);
ConnectionFactory factory = new ConnectionFactory();
// use the factory to get a connection
ConnectionDescriptor conDescriptor = factory.getConnection(url, TransportInfo.TRANSPORT_TCP_CELLULAR,null);
if ( conDescriptor != null ) {
HttpConnection conn = (HttpConnection) conDescriptor.getConnection();
Dialog.alert("http");
//conn.setRequestMethod(HttpConnection.GET);
Dialog.alert("conn.setre");
int responseCode = conn.getResponseCode();
Dialog.alert(Integer.toString(responseCode));
if(responseCode == HttpConnection.HTTP_OK)
{
Dialog.alert("OK");
InputStream data = conn.openInputStream();
StringBuffer raw = new StringBuffer();
byte[] buf = new byte[4096];
int nRead = data.read(buf);
while(nRead > 0)
{
raw.append(new String(buf, 0, nRead));
nRead = data.read(buf);
}
}
}
}catch(Exception e){
Dialog.alert(e.getMessage());
}
}
});
I am getting an exception Critical tunnel failure. But i am able to retrieve the location coordinates correctly. I am using blackberry 8520 with airtel sim which is enabled with data services. Actually this app worked well in the mobile with version 5.0. But it's not working in the mobile which i've upgraded from 4.6.1.3 to 5.0.0 what might be the problem? Please provide me a solution. thank you
I also tried the below url's:
http://56.91.532.72:8084/SFTS/updateLocation.jsp?empid=12304&lat=16.9477&lon=82.23970;deviceside=true;apn=null
http://56.91.532.72:8084/SFTS/updateLocation.jsp?empid=12304&lat=16.9477&lon=82.23970;deviceside=true;apn=airtelgprs.com
I also enabled apn settings in my mobile
It is because you haven't set up the apn correctly. As you are using direct tcp, the apn has to be set in order to connect to the network.
Also , network connections should be done on a separate thread.
Related
I've implemented timer task on background application.
I've collected current lat and long. and send to server each 30 seconds.
I've used below code to send the information to server. It sends successfully..
My problem is, after i've checked 10 minutes, I'm unable to send. it throws a No Network error. I've checked browser too but no network.
If reset the device, its working again well. But the same problem occurs after 5 or 10 mins.
How to resolve this?
My code is,
try
{
StreamConnection connection = (StreamConnection) Connector.open(url+suffix);
((HttpConnection) connection).setRequestMethod(HttpConnection.GET);
int responseCode = ((HttpConnection) connection).getResponseCode();
if (responseCode != HttpConnection.HTTP_OK) {
showDialog("Unexpected response code :"+ responseCode);
connection.close();
return;
}
((HttpConnection) connection).getHeaderField("Content-type");
ByteArrayOutputStream baos = new ByteArrayOutputStream();
InputStream responseData = connection.openInputStream();
byte[] buffer = new byte[1000];
int bytesRead = responseData.read(buffer);
while (bytesRead > 0) {
baos.write(buffer, 0, bytesRead);
bytesRead = responseData.read(buffer);
}
baos.close();
connection.close();
String s = new String(baos.toByteArray());
showDialog("Responce from server "+s);
}
catch (IOException e)
{
}
Usually, when you have some problem where it works a few times, and then stops working, and you need to reset the device, you've done something that has used up all available resources, without releasing them when you're done.
When performing repeated network operations, you should clean up your streams and connections after each use.
Normally, the proper way to write network code is to declare network variables outside a try block, assign and use them inside the try, while catching any IOExceptions thrown. Then, you use a finally block to clean up your resources, no matter whether the code finished successfully or not.
I'll also note that when debugging network problems, you don't want to have a catch() handler that simply traps exceptions and does nothing with them. Print out a message to the console (for testing) or log the error to a file.
Finally, I can't see your showDialog() method, but if it's displaying a UI to the user/tester, you need to do that on the UI thread. But, the network code that you show above should be run on a background thread to keep the UI responsive. So, inside showDialog(), just make sure you use code to modify the UI on the UI thread.
So, a better implementation might be this:
private void requestFromServer() {
StreamConnection connection = null;
ByteArrayOutputStream baos = null;
InputStream responseData = null;
try
{
connection = (StreamConnection) Connector.open(url+suffix);
((HttpConnection) connection).setRequestMethod(HttpConnection.GET);
int responseCode = ((HttpConnection) connection).getResponseCode();
if (responseCode != HttpConnection.HTTP_OK) {
showDialog("Unexpected response code :"+ responseCode);
return;
}
((HttpConnection) connection).getHeaderField("Content-type");
baos = new ByteArrayOutputStream();
responseData = connection.openInputStream();
byte[] buffer = new byte[1000];
int bytesRead = responseData.read(buffer);
while (bytesRead > 0) {
baos.write(buffer, 0, bytesRead);
bytesRead = responseData.read(buffer);
}
String s = new String(baos.toByteArray());
showDialog("Responce from server "+s);
}
catch (IOException e)
{
System.out.println("Network error: " + e.getMessage());
}
finally
{
try {
if (connection != null) {
connection.close();
}
if (baos != null) {
baos.close();
}
if (responseData != null) {
responseData.close();
}
} catch (IOException e) {
// nothing to do here
}
}
}
private void showDialog(final String msg) {
UiApplication.getUiApplication().invokeLater(new Runnable() {
public void run() {
Dialog.alert(msg);
}
});
}
this is the code i wrote to send the url request using a thread:
while(true)
{
String url="http://192.168.1.7:8084/SFTS/updateLocation.jsp?empid=12304&lat=16.23&lon=21.998;interface=wifi";
try{
StreamConnection conn = (StreamConnection)Connector.open(url, Connector.READ_WRITE);
conn.openInputStream();
Thread.sleep(30*1000);
conn.close();
}catch(Exception e)
{
e.printStackTrace();
}
try {
Thread.sleep(30*1000);
} catch (InterruptedException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
the code i used to this thread:
Calendar cal=Calendar.getInstance();
long time=cal.get(Calendar.HOUR);
add(new RichTextField(String.valueOf(time)));
(new test()).start();
by using this code i am able to send one request successfully but after that server is not receiving other request. please provide me a solution.
Firstly, when you're using a while loop like this, you shouldn't put the sleep within the try method.
while(true)
{
try{
String url="http://192.19.18.10:8084/SFTS/updateLocation.jsp?empid=12304&lat="+lan+".23&lon=21.998;interface=wifi";
StreamConnection conn = (StreamConnection)Connector.open(url, Connector.READ_WRITE);
conn.openInputStream();;
}catch(Exception e)
{
e.printStackTrace();
}
try {
Thread.sleep(30*1000);
} catch (InterruptedException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
Secondly, you're constantly trying to create a new stream without first closing the previous connection. Either read up on how StreamConnection works effectively, or simply use ConnectionFactory and not StreamConnection.
ConnectionFactory connFact = new ConnectionFactory();
ConnectionDescriptor connDesc;
connDesc = connFact.getConnection(url);
if (connDesc != null) {
try {
HttpConnection httpConn;
httpConn = (HttpConnection) connDesc.getConnection();
httpConn.close();
} catch (IOException e) {
System.err.println("Caught IOException: " + e.getMessage());
}
The above is for OS 5 and above, in your case... as the connection seems to work the first time, in your existing code I would try simply closing the connection using:
conn.close();
I am working with OS 5.0 and I am trying to get some info from a wcf.
On the emulator it works like a champ, but on a device, with wifi connected, I get the error:
APN is not specified
my code:
HttpConnection con = null;
InputStream is = null;
try {
con = (HttpConnection) Connector.open(url);
final int responseCode = con.getResponseCode();
if (responseCode != HttpConnection.HTTP_OK) {
System.out.println(responseCode);
}
is = con.openInputStream();
byte[] responseData = new byte[10000];
int length = 0;
StringBuffer rawResponse = new StringBuffer();
while (-1 != (length = is.read(responseData))) {
rawResponse.append(new String(responseData, 0, length));
}
final String result = rawResponse.toString();
_labelField.setText(result);
} catch (final Exception ex) {
System.out.println(ex.getMessage());
_labelField.setText(ex.getMessage());
} finally {
try {
is.close();
is = null;
con.close();
con = null;
} catch (Exception e) {
}
}
Check this article "Different ways to make HTTP Socket Connection". This article would help you understand how to make network connections if you are on BES network or BIS or WiFi or 3G network etc.
Getting back to your problem, if you want to connect through Wi-Fi, you will need to modify your connection url. Replace the following:
con = (HttpConnection) Connector.open(url);
With this:
con = (HttpConnection) Connector.open(url+";interface=wifi");
Now it would work on device with Wi-Fi connectivity.
I am new in developing Blackberry Application.
In these three days, I already searched and learned in both forum and tutorial from the RIM itself. But none of them can solve my problem. >.<
So. I already tried some different methods to establish http connection over BIS in 4.6.
These are the following codes:
1.
HttpConnection httpConnection;
String url = "myURL;deviceside=true";
try{
httpConnection = (HttpConnection) Connector.open(url);
Dialog.inform(">.<");
}
catch(Exception e)
{
Dialog.inform(e.getMessage());
}
From the code #1 above, none of the dialogs are displayed.
String url = "myURL";
try {
StreamConnection s = (StreamConnection)Connector.open(url);
InputStream input = s.openInputStream();
Dialog.inform("sblm byte");
byte[] data = new byte[256];
int len = 0;
StringBuffer raw = new StringBuffer();
Dialog.inform("stlh buat byte");
while( -1 != (len = input.read(data))) {
raw.append(new String(data, 0, len));
}
Dialog.inform("stlh while");
response = raw.toString();
Dialog.inform(response);
input.close();
s.close();
}
catch(Exception e) { }
As well as code #1, this code above also doesnt pop up any dialog.
I am desperately need the right guide for establishing simple http connection. Is there any technique that I missed? Do I need any signature for this? Do I need extra setting in both my Blackberry device (BB 8900 with OS 5.00) or in my compiler, Eclipse?
Thank you.
Try this code.
try {
HttpConnection httpConnection=(HttpConnection)Connector.open(url);
httpConnection.setRequestMethod(HttpConnection.GET);
if(httpConnection.getResponseCode()==HttpConnection.HTTP_OK)
{
InputStream is=httpConnection.openInputStream();
int ch;
StringBuffer buffer=new StringBuffer();
while((ch=is.read())!=-1)
{
buffer.append((char)ch);
}
}
} catch (IOException e) {
System.out.println("Exception From Thread"+e);
e.printStackTrace();
}
}
i am new to black berry.i am doing one task,i have one webservice to show some url.i need to retrive it and connect to that url.i tried with two threads one is to retrive url and other is to connect to url which is in webservice but it shows nullpointer exception.please help me.
Thank You.
since you have not posted any code, it's very difficult to diagnose the problem. But look at the following code which tries to open an absolute url. This can be helpful.
Use this method for both of your connection (Web Service and URL returned from Web Service). Be sure to call this method in a separate thread otherwise it will freeze the UI.
public static ResponseBean sendRequestAndReceiveResponse(
String method, String absoluteURL, String bodyData, boolean readResponseBody)
throws IOException
{
ResponseBean responseBean = new ResponseBean();
HttpConnection httpConnection = null;
try
{
String formattedURL = absoluteURL + "deviceside=true;interface=wifi"; // If you are using WiFi
//String formattedURL = absoluteURL + "deviceside=false"; // If you are using BES
//String formattedURL = absoluteURL + "deviceside=true"; // If you are using TCP
if(DeviceInfo.isSimulator()) // if simulator is running
formattedURL = absoluteURL;
httpConnection = (HttpConnection) Connector.open(formattedURL);
httpConnection.setRequestMethod(method);
if (bodyData != null && bodyData.length() > 0)
{
OutputStream os = httpConnection.openOutputStream();
os.write(bodyData.getBytes("UTF-8"));
}
int responseCode = httpConnection.getResponseCode();
responseBean.setResponseCode(responseCode);
if (readResponseBody)
{
responseBean.setBodyData(readBodyData(httpConnection));
}
}
catch (IOException ex)
{
System.out.println("!!!!!!!!!!!!!!! IOException in NetworkUtil::sendRequestAndReceiveResponse(): " + ex);
throw ex;
}
catch(Exception ex)
{
System.out.println("!!!!!!!!!!!!!!! Exception in NetworkUtil::sendRequestAndReceiveResponse(): " + ex);
throw new IOException(ex.toString());
}
finally
{
if (httpConnection != null)
httpConnection.close();
}
return responseBean;
}
public static StringBuffer readBodyData(HttpConnection httpConnection) throws UnsupportedEncodingException, IOException
{
if(httpConnection == null)
return null;
StringBuffer bodyData = new StringBuffer(256);
InputStream inputStream = httpConnection.openDataInputStream();
byte[] data = new byte[256];
int len = 0;
int size = 0;
while ( -1 != (len = inputStream.read(data)) )
{
bodyData.append(new String(data, 0, len,"UTF-8"));
size += len;
}
if (inputStream != null)
{
inputStream.close();
}
return bodyData;
}