I am simply trying to parse json using the foursquare venues API and make make some location visible in a list box in my windowphone application but I keep getting the error securityexception was unhandled when I run this line of code.
var providerResult = (Venues.RootObject)dataContractJsonSerializer.ReadObject(stream);
in
private void client_DownloadStringCompleted(object sender, DownloadStringCompletedEventArgs e) {
if (e.Error == null) {
using (MemoryStream stream = new MemoryStream(Encoding.UTF8.GetBytes(e.Result))) {
DataContractJsonSerializer dataContractJsonSerializer = new DataContractJsonSerializer(typeof(Venues.RootObject));
var providerResult = (Venues.RootObject)dataContractJsonSerializer.ReadObject(stream);
if (providerResult == null) {
MessageBox.Show("No location were found");
}
else {
locations.ItemsSource = providerResult.response.venues;
}
}
}
else {
MessageBox.Show(e.Error.Message);
}
}
Related
This question already has answers here:
Error for HttpResponseCode cannot be resolved to a type while checking URL status code for links
(1 answer)
requests.exceptions.MissingSchema: Invalid URL 'None': No schema supplied while trying to find broken links through Selenium and Python
(2 answers)
Closed 3 years ago.
Please check the below code which i tried
Here i want to check if all links are getting opened that should not contain any 404 page
public void alllinks() {
suites.setupEnviroment();
WebDriver driver = suites.getWebDriver();
driver.get(suites.WEB_PATH5);
Dimension d = new Dimension(1455, 900);
driver.manage().window().setSize(d);
try {
List<WebElement> links = driver.findElements(By.tagName("a"));
ArrayList<String> targets = new ArrayList<String>();
// collect targets locations
for (WebElement link : links) {
targets.add(link.getAttribute("href"));
}
for (String target : targets) {
driver.get(target);
try {
((WebDriver) links).getPageSource().contains("404");
} catch (Exception e) {
System.out.println("error");
}
// do what is needed in the target
}
Logger.getLogger("results").log(new LogRecord(Level.INFO,
MethodHandles.lookup().lookupClass().getCanonicalName() != null ? "success" : "failure"));
driver.close();
} catch (Exception e) {
Logger.getLogger("results").log(new LogRecord(Level.INFO,
MethodHandles.lookup().lookupClass().getCanonicalName() == null ? "success" : "failure"));
}
Thanks in advance!
this sample should do the job. Adapt it to your needs.
public class FindBrokenLinks {
private WebDriver driver;
private int invalidLinks = 0;
#BeforeClass
public void setUp() {
driver = new ChromeDriver();
driver.get("http://google.com"); // change the url
}
#Test
public void checkForBrokenLinks() {
try {
List<WebElement> links = driver.findElements(By.tagName("a"));
for (WebElement link : links) {
if (link != null) {
checkLink(link);
}
}
System.out.println("Total broken links: " + invalidLinks);
} catch (Exception e) {
e.printStackTrace();
}
}
#AfterClass
public void tearDown() {
if (driver != null)
driver.quit();
}
public void checkLink(WebElement linkElement) throws IOException {
HttpURLConnection connection = null;
try {
String link = linkElement.getAttribute("href");
URL url = new URL(link);
connection = (HttpURLConnection) url.openConnection();
connection.setRequestMethod("GET");
connection.connect();
int responseCode = connection.getResponseCode();
// change the code for your needs.
if (responseCode == 404) {
// you can trow error also ...
System.out.println("Found invalid link: " + link);
invalidLinks++;
}
connection.disconnect();
} catch (Exception e) {
e.printStackTrace();
if (connection != null) {
connection.getErrorStream().close();
}
}
}
}
I have a list wich is loaded with elements each time the user make a research...These elements contain an Icon which is dowloaded with an async method GetByteArrayAsync of the HttpClient object. I have an issue when the user make a second research while the icon of the first list are still downloading.Because the list of elements is changing while Icon downloads are processing on each element of the first list. So my guess is that I need to cancel these requests each time the user proceed to a new research...Ive readen some stuuf on Task.run and CancellationTokenSource but I can't find really helpful example for my case so here is my code...Hope you can help me with that ...Thank you
public static async Task<byte[]> DownloadElementFile(BdeskElement bdeskElement)
{
//create and send the request
DataRequest requesteur = new DataRequest();
byte[] encryptedByte = await requesteur.GetBytesAsync(dataRequestParam);
return encryptedByte;
}
public async Task<Byte[]> GetBytesAsync(DataRequestParam datarequesparam)
{
var handler = new HttpClientHandler { Credentials = new NetworkCredential(datarequesparam.AuthentificationLogin, datarequesparam.AuthentificationPassword, "bt0d0000") };
HttpClient httpClient = new HttpClient(handler);
try
{
byte[] BytesReceived = await httpClient.GetByteArrayAsync(datarequesparam.TargetUri);
if (BytesReceived.Length > 0)
{
return BytesReceived;
}
else
{
return null;
}
}
catch (WebException)
{
throw new MyException(MyExceptionsMessages.Webexception);
}
}
EDIT
public async Task<Byte[]> GetBytesAsync(DataRequestParam datarequesparam)
{
var handler = new HttpClientHandler { Credentials = new NetworkCredential(datarequesparam.AuthentificationLogin, datarequesparam.AuthentificationPassword, "bt0d0000") };
HttpClient httpClient = new HttpClient(handler);
try
{
cts = new CancellationTokenSource();
HttpResponseMessage reponse = await httpClient.GetAsync(datarequesparam.TargetUri,cts.Token);
if (reponse.StatusCode == HttpStatusCode.OK)
{
byte[] BytesReceived = reponse.Content.ReadAsByteArrayAsync().Result;
if (BytesReceived.Length > 0)
{
return BytesReceived;
}
else
{
return null;
}
}
else
{
return null;
}
}
catch (WebException)
{
throw new MyException(MyExceptionsMessages.Webexception);
}
catch(OperationCanceledException)
{
throw new OperationCanceledException();
}
EDIT2
I need to cancel this funntion when the user make a new research and the list "listBoxGetDocsLibs" changed.
private async void LoadIconDocLibs()
{
foreach (var doclib in listBoxGetDocsLibs)//ERROR HERE COLLECTION HAS CHANGED
{
doclib.Icon = new BitmapImage();
try
{
byte[] Icon = await ServerFunctions.GetDocLibsIcon(doclib);
if (Icon != null)
{
{
var ms = new MemoryStream(Icon);
BitmapImage photo = new BitmapImage();
photo.DecodePixelHeight = 64;
photo.DecodePixelWidth = 92;
photo.SetSource(ms);
doclib.Icon = photo;
}
}
}
catch(OperationCanceledException)
{
}
}
}
First you need to define CancellationTokenSource:
private System.Threading.CancellationTokenSource cts;
place above code somewhere, where you can access it with your Button or other method.
Unfortunately GetByteArrayAsync lacks Cancelling - so it cannot be used with cts.Token, but maybe you can accomplish your task using GetAsync - which supports Cancelling:
ctsDownload = new System.Threading.CancellationTokenSource();
HttpResponseMessage response = await httpClient.GetAsync(requestUri, cts.Token);
Then you can get your content from response.
And when you want to Cancel your Task it can look like this:
private void cancelBtn_Click(object sender, RoutedEventArgs e)
{
if (this.cts != null)
this.cts.Cancel();
}
When you Cancel task an Exception will be thrown.
If you want to cancel your own async Task, a good example you can find at Stephen Cleary blog.
EDIT - you can also build your own method (for example with HttpWebRequest) which will support Cancelling:
For this purpose you will have to extend HttpWebRequest (under WP it lacks GetResponseAsync):
// create a static class in your namespace
public static class Extensions
{
public static Task<HttpWebResponse> GetResponseAsync(this HttpWebRequest webRequest)
{
TaskCompletionSource<HttpWebResponse> taskComplete = new TaskCompletionSource<HttpWebResponse>();
webRequest.BeginGetResponse(
asyncResponse =>
{
try
{
HttpWebRequest responseRequest = (HttpWebRequest)asyncResponse.AsyncState;
HttpWebResponse someResponse = (HttpWebResponse)responseRequest.EndGetResponse(asyncResponse);
taskComplete.TrySetResult(someResponse);
}
catch (WebException webExc)
{
HttpWebResponse failedResponse = (HttpWebResponse)webExc.Response;
taskComplete.TrySetResult(failedResponse);
}
catch (Exception exc) { taskComplete.SetException(exc); }
}, webRequest);
return taskComplete.Task;
}
}
Then your method can look like this:
public async Task<Byte[]> GetBytesAsync(DataRequestParam datarequesparam, CancellationToken ct)
{
HttpWebRequest request = HttpWebRequest.CreateHttp(datarequesparam.TargetUri);
request.Method = "GET";
request.Credentials = new NetworkCredential(datarequesparam.AuthentificationLogin, datarequesparam.AuthentificationPassword, "bt0d0000");
request.AllowReadStreamBuffering = false;
try
{
if (request != null)
{
using (HttpWebResponse response = await request.GetResponseAsync())
using (Stream mystr = response.GetResponseStream())
using (MemoryStream output = new MemoryStream())
{
const int BUFFER_SIZE = 10 * 1024;
byte[] buf = new byte[BUFFER_SIZE];
int bytesread = 0;
while ((bytesread = await mystr.ReadAsync(buf, 0, BUFFER_SIZE)) > 0)
{
output.Write(buf, 0, bytesread);
ct.ThrowIfCancellationRequested();
}
return output.ToArray();
}
}
else return null;
}
catch (WebException)
{
throw new MyException(MyExceptionsMessages.Webexception);
}
}
You can freely change Buffer Size which will affect how often Cancellation will be checked.
I haven't tried this but I think it should work.
I would like to run a task during the waiting of a web request. If the task finishes before the request can return a response, then I would display a message "The server is taking too long". I'm using a WebClient object, how can I manage the time out?
public Class Result
{
protected override void OnNavigatedTo(NavigationEventArgs e)
{
if (NavigationContext.QueryString.TryGetValue("critere", out sCritere))
{
try
{
_datamanager = new DataManager();
_datamanager.m_evt_Client_DownloadStringCompleted += OnDownloadStringCompleted;
_datamanager.DownloadXmlData(DataManager.URL_RECHERCHE, sCritere);
//HERE I NEED TO RUN A TIMER If the response is too long i would display a message
}
catch(Exception ex)
{
MessageBox.Show(ex.Message, "Erreur", MessageBoxButton.OK);
NavigationService.GoBack();
NavigationService.RemoveBackEntry();
}
}
}
}
public Class DataManager
{
public void DownloadXmlData(string uri, string critere = "")
{
try
{
WebClient client = new WebClient();
client.DownloadStringCompleted += new DownloadStringCompletedEventHandler(client_DownloadStringCompleted);
client.Credentials = new NetworkCredential(UserSaved, PasswordSaved, domain);
client.DownloadStringAsync(new Uri(uri + critere));
}
catch(WebException )
{
throw new WebException(MyExceptionsMessages.Webexception) ;
}
catch (Exception )
{
throw new UnknowException(MyExceptionsMessages.UnknownError);
}
}
public void client_DownloadStringCompleted(object sender, DownloadStringCompletedEventArgs e)
{
//raise Downloadstringcompleted event if error==null
}
}
You can use BackgroundWorker..
BackgroundWorker bw = new BackgroundWorker();
bw.DoWork += (s, e) =>
{
// your task to do while webclient is downloading
};
bw.RunWorkerCompleted += (s, e) =>
{
// check whether DownloadStringCompleted is fired or not
// if not, cancel the WebClient's asynchronous call and show your message.
client.CancelAsync();
MessageBox.Show("message");
}
client.DownloadStringAsync(uri);
bw.RunWorkerAsync();
I do a webrequest with DownloadStringAsync() but I need to return the result only when the DownloadStringCompleted event has been called. After the downloadasync-method, I need to wait for the result and then I could return it in a string property. So I implemented a while(Result == "") but I don't know what to do there. I already tried Thread.sleep(500) but it seems the download never gets completed. And the code remains in the while forever.
string Result = "";
public String Query(DataRequestParam dataRequestParam)
{
try
{
WebClient web = new WebClient();
if (!string.IsNullOrEmpty(dataRequestParam.AuthentificationLogin))
{
System.Net.NetworkCredential account = new NetworkCredential(dataRequestParam.AuthentificationLogin, dataRequestParam.AuthentificationPassword);
web.Credentials = account;
}
web.DownloadStringCompleted += OnDownloadStringCompleted;
web.DownloadStringAsync(dataRequestParam.TargetUri);
while (Result == "")
{
//What am i supposed to do here ?
}
return Result;
}
catch(WebException we)
{
MessageBox.Show(we.Message);
return null;
}
}
private void OnDownloadStringCompleted(object sender, DownloadStringCompletedEventArgs e)
{
if (e.Error != null)
{
//Error treating
}
else
{
Result = e.Result;
}
}
UI CODE
protected override void OnNavigatedTo(NavigationEventArgs e)
{
base.OnNavigatedTo(e);
if (e.NavigationMode != NavigationMode.Back)
{
ServerFunctions.SetUserProfil(User.UserLogin,User.UserPassword);
this.listBoxGetDocsLibs.Clear();
List<BdeskDocLib> list = new List<BdeskDocLib>();
try
{
//HERE THE START OF THE DOWNLOAD
ServerFunctions.GetDocLibs(true);
}
catch (Exception ex)
{
//error
}
foreach (BdeskDocLib docLib in list)
{
this.listBoxGetDocsLibs.Add(docLib);
}
}
}
the ServerFunction static class
public static List<BdeskDocLib> GetDocLibs(bool onlyDocLibPerso)
{
string xmlContent = GetXml(URL_GETDOCLIBS);
List<BdeskDocLib> result = BdeskDocLib.GetListFromXml(xmlContent, onlyDocLibPerso);
return result;
}
private static String GetXml(string partialUrl)
{
string url = GenerateUrl(partialUrl);
DataRequestParam dataRequestParam = new DataRequestParam();
dataRequestParam.TargetUri = new Uri(url);
dataRequestParam.UserAgent = "BSynchro";
dataRequestParam.AuthentificationLogin = userLogin;
dataRequestParam.AuthentificationPassword = userPwd;
//HERE I START THE QUERY method
// NEED QUERY RETURNS A STRING or Task<String>
DataRequest requesteur = new DataRequest();
xmlResult=requesteur.Query(dataRequestParam);
if (CheckErrorConnexion(xmlResult) == false)
{
throw new Exception("Erreur du login ou mot de passe");
}
return xmlResult;
}
There is nothing good in blocking main UI (unless you really need to). But if you want to wait for your result you can make some use of async-await and TaskCompletitionSource - you can find more about on this blog and how to use TCS in this answer:
public static Task<string> myDownloadString(DataRequestParam dataRequestParam)
{
var tcs = new TaskCompletionSource<string>();
var web = new WebClient();
if (!string.IsNullOrEmpty(dataRequestParam.AuthentificationLogin))
{
System.Net.NetworkCredential account = new NetworkCredential(dataRequestParam.AuthentificationLogin, dataRequestParam.AuthentificationPassword);
web.Credentials = account;
}
web.DownloadStringCompleted += (s, e) =>
{
if (e.Error != null) tcs.TrySetException(e.Error);
else if (e.Cancelled) tcs.TrySetCanceled();
else tcs.TrySetResult(e.Result);
};
web.DownloadStringAsync(dataRequestParam.TargetUri);
return tcs.Task;
}
public async Task<string> Query(DataRequestParam dataRequestParam)
{
string Result = "";
try
{
Result = await myDownloadString(dataRequestParam);
}
catch (WebException we)
{
MessageBox.Show(we.Message);
return null;
}
return Result;
}
(I've not tried this code, there maight be some mistakes, but it should work)
Basing on this code you can also extend your WebClient with awaitable version of download string.
I am trying to post some data to our webservice(written in c#) and get the response. The response is in JSON format.
I am using the Blackberry Code Sample which is BlockingSenderDestination Sample. When I request a page it returns with no problem. But when I send my data to our webservice it does not return anything.
The code part that I added is :
ByteMessage myMsg = bsd.createByteMessage();
//myMsg.setStringPayload("I love my BlackBerry device!");
myMsg.setMessageProperty("querytpe","myspecialkey");//here is my post data
myMsg.setMessageProperty("uname","myusername");
myMsg.setMessageProperty("pass","password");
((HttpMessage) myMsg).setMethod(HttpMessage.POST);
// Send message and wait for response myMsg
response = bsd.sendReceive(myMsg);
What am i doing wrong? And what is the alternatives or more efficients way to do Post with Blackberry.
Regards.
Here is my whole code:
class BlockingSenderSample extends MainScreen implements FieldChangeListener {
ButtonField _btnBlock = new ButtonField(Field.FIELD_HCENTER);
private static UiApplication _app = UiApplication.getUiApplication();
private String _result;
public BlockingSenderSample()
{
_btnBlock.setChangeListener(this);
_btnBlock.setLabel("Fetch page");
add(_btnBlock);
}
public void fieldChanged(Field button, int unused)
{
if(button == _btnBlock)
{
Thread t = new Thread(new Runnable()
{
public void run()
{
Message response = null;
String uriStr = "http://192.168.1.250/mobileServiceOrjinal.aspx"; //our webservice address
//String uriStr = "http://www.blackberry.com";
BlockingSenderDestination bsd = null;
try
{
bsd = (BlockingSenderDestination)
DestinationFactory.getSenderDestination
("name", URI.create(uriStr));//name for context is name. is it true?
if(bsd == null)
{
bsd =
DestinationFactory.createBlockingSenderDestination
(new Context("ender"),
URI.create(uriStr)
);
}
//Dialog.inform( "1" );
ByteMessage myMsg = bsd.createByteMessage();
//myMsg.setStringPayload("I love my BlackBerry device!");
myMsg.setMessageProperty("querytpe","myspecialkey");//here is my post data
myMsg.setMessageProperty("uname","myusername");
myMsg.setMessageProperty("pass","password");
((HttpMessage) myMsg).setMethod(HttpMessage.POST);
// Send message and wait for response myMsg
response = bsd.sendReceive(myMsg);
if(response != null)
{
BSDResponse(response);
}
}
catch(Exception e)
{
//Dialog.inform( "ex" );
// process the error
}
finally
{
if(bsd != null)
{
bsd.release();
}
}
}
});
t.start();
}
}
private void BSDResponse(Message msg)
{
if (msg instanceof ByteMessage)
{
ByteMessage reply = (ByteMessage) msg;
_result = (String) reply.getStringPayload();
} else if(msg instanceof StreamMessage)
{
StreamMessage reply = (StreamMessage) msg;
InputStream is = reply.getStreamPayload();
byte[] data = null;
try {
data = net.rim.device.api.io.IOUtilities.streamToBytes(is);
} catch (IOException e) {
// process the error
}
if(data != null)
{
_result = new String(data);
}
}
_app.invokeLater(new Runnable() {
public void run() {
_app.pushScreen(new HTTPOutputScreen(_result));
}
});
}
}
..
class HTTPOutputScreen extends MainScreen
{
RichTextField _rtfOutput = new RichTextField();
public HTTPOutputScreen(String message)
{
_rtfOutput.setText("Retrieving data. Please wait...");
add(_rtfOutput);
showContents(message);
}
// After the data has been retrieved, display it
public void showContents(final String result)
{
UiApplication.getUiApplication().invokeLater(new Runnable()
{
public void run()
{
_rtfOutput.setText(result);
}
});
}
}
HttpMessage does not extend ByteMessage so when you do:
((HttpMessage) myMsg).setMethod(HttpMessage.POST);
it throws a ClassCastException. Here's a rough outline of what I would do instead. Note that this is just example code, I'm ignoring exceptions and such.
//Note: the URL will need to be appended with appropriate connection settings
HttpConnection httpConn = (HttpConnection) Connector.open(url);
httpConn.setRequestMethod(HttpConnection.POST);
OutputStream out = httpConn.openOutputStream();
out.write(<YOUR DATA HERE>);
out.flush();
out.close();
InputStream in = httpConn.openInputStream();
//Read in the input stream if you want to get the response from the server
if(httpConn.getResponseCode() != HttpConnection.OK)
{
//Do error handling here.
}