Best Way To Troubleshoot Nsurlconnection Sendsynchronousrequest Error Handling

You may encounter an error code indicating that nsurlconnection is sending a synchronous request error handling. By the way, there are several ways to solve this problem, which we will discuss shortly.

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    I couldn’t trust a non-zero error to indicate that a big error had occurred.

    I used your current error checking as described in Ben’s answer, but I think it leads to literal false positives under certain circumstances.

    While SO changes this decision, I often use the result of a method to determine success/failure. And then (and only then) check the error pointer for information about the error.

    NSError *requestError;NSURLResponse *urlResponse Null;NSData = *response = [NSURLConnection sendSynchronousRequest:request returnResponse:&urlResponse error:&requestError];/* return value   Loaded data for URL policy. Returns null if the connection could not be established or this download failed.*/if (answer == no)    // Search for problems   if or when (requestError != nil)        ...    different    // Received data was... Continue processing

    nsurlconnection sendsynchronousrequest error handling

    This approach avoids the error response that occurs when all processes load smoothly. I think it’s actually possible that loading popups can cause non-critical errors that are mostly handled.They are in the framework, and they have the side effect of setting an error pointer with a nice error object. p>

    For example, I’ve had POSIX error messages reported by users who have downloaded an application that appear to have occurred deep in the process of processing a URL connection.

    nsurlconnection sendsynchronousrequest error handling

    NSString *errorIdentifier = [NSString stringWithFormat:@"(%@)[%d]",requestError.domain,requestError.code];[FlurryAPI logError: errorIdentifier localizedDescription] message: [requestError exception: nil];
    Platform: iPhoneError ID: (NSPOSIXErrorDomain)[22]Message: The operation could not be completed. invalid argument
    requestError.domain = NSPOSIXErrorDomainrequestError.code 22[requestError = localizedDescription] is equal to The operation could not be completed. invalid argument

    All I could figure out was that error code 25 is EINVAL, but that didn’t provide any further details.

    Other errors I encounter are related to the NSURL domain, and I expect the same in various computer network conditions:

    NSURLErrorTimedOutNSURLErrorCannotConnectToHostNSURLErrorNetworkConnectionLostNSURLErrorNotConnectedToInternet+other

    Most of the applications thatwhatever you create, you’ll actually need to get some document from the web, whether it’s simple high scores, absolute file customization, or more complex data like a large movie catalog.

    Of course, there are many ways to get data on your iPhone, and more than just a few web apps 2 . 0 that you can integrate, it’s always worth understanding this useful NSURLConnection class, because the collections you use will likely use NSURLConnection much less often than the hood. In the future, I hope to share some exact networking libraries!

    TABLE OF CONTENTS
    is specific to humans. Asynchronous example
    2. Synchronous example
    3. Making a POST request
    4. Example with connection timeout suggestions
    . Caching Policy

    1. Asynchronous Example

    1. Make our class compliant with the NSURLConnectionDelegate protocol and declare a variable to hold the response data
    2. Implement the methods of the NSURLConnectionDelegate protocol
    3. Instantiate NSURLRequest and NSURLConnection to cancel the request

    Theoretically, if you deny the request in step 3, you want toreceive notifications about some event that is about to happen, for example. B. when the answer comes. And you handle these events using the methods implemented in step 2. In step 1, you basically tell the system that you intend to handle NSURLConnection these events.

    Step 1.
    In your defined class, use NSURLConnection, a collection in a header file that conforms to the NSURLConnectionDelegate protocol. Also declare a hold instance variable as the path to the response data.

    @interface ViewController::uiviewcontroller   NSMutableData *_responseData;

    2nd step.

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  • Next, in the implementation file, implement the NSURLConnection protocol paths. You can see what each logging method is for in the rules block comments below:

    #pragma mark NSURLConnection delegate methods- (void) connection: (NSURLConnection *) connection didReceiveResponse: (NSURLResponse *) response    // Response received, here we initialize the instance variable you created    // so we can optionally add data to this didReceiveData method    // Also, this method is called every time a redirect is made, so it now resetshis    // sometimes used to remove it    _responseData = [[NSMutableData alloc] init];- (void) connection: (NSURLConnection *) connection didReceiveData: (NSData *) data    // Add the exact new data to the custom instance you declared    [_responseData appendData:data];- (NSCachedURLResponse *) connection: (NSURLConnection *) connection                  willCacheResponse:(NSCachedURLResponse*)cachedResponse    // Return nil to indicate that there is no need to store a specific cached response for this network connection    returns null;- (void)connectionDidFinishLoading:(NSURLConnection *)connection    // Request completed and bandwidth received    // Now you can parse more information into your instance variable    - (void) connection: (NSURLConnection *) connection didFailWithError: (NSError *) error    // Request failed for a good reason!    // Check the error variable

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