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POApp crashes on click of Back button in iPhone
 

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  1. POApp crashes on click of Back button in iPhone
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    <p>I am new to iPhone,</p> <p>I am currently developing an iPhone app and in which i have implement the ability to download file from the url. I have created the UIWebView, when users clicks on download link in the <code>webview</code>, download will start and i am saving that file to a specified folder in the documents directory, this all things are working fine in my <code>Second View</code>..</p> <p>but after this when i press a back button for navigating to a my <code>First view</code>, my app gets crashed... shows <code>EXC_BAD_ACCESS</code></p> <pre><code>-(void)viewWillAppear:(BOOL)animated{ //Doing some operation and it works fine... NSLog(@"viewWillAppear in First View......."); } -(void)viewDidAppear:(BOOL)animated{ NSLog(@"viewDidAppear in First View......."); } </code></pre> <p>I am able to see above <code>Log</code> When i hit back button but my app crashes after 1 or half second.</p> <p>Here is my code in <code>Second View</code>,</p> <pre><code>- (void)connection:(NSURLConnection *)connection didReceiveResponse:(NSURLResponse *)response { [receivedData setLength:0]; } - (void)connection:(NSURLConnection *)connection didReceiveData:(NSData *)data1 { [receivedData appendData:data1]; } - (void)connectionDidFinishLoading:(NSURLConnection *)connection { NSLog(@"Succeeded! Received %d bytes of data",[receivedData length]); DirPath=[self applicationDocumentsDirectory]; NSLog(@"DirPath=%@",DirPath); [receivedData writeToFile:DirPath atomically:YES]; UIAlertView* Alert = [[UIAlertView alloc] initWithTitle:@"Download Complete !" message:nil delegate:nil cancelButtonTitle:@"OK" otherButtonTitles:nil]; [Alert show]; [Alert release]; // release the connection, and the data object [connection release]; [receivedData release]; } - (void)connection:(NSURLConnection *)connection didFailWithError:(NSError *)error1 { [connection release]; [receivedData release]; // inform the user NSLog(@"Connection failed! Error - %@ %@", [error1 localizedDescription], [[error1 userInfo] objectForKey:NSURLErrorFailingURLStringErrorKey]); } - (BOOL)webView:(UIWebView*)webView shouldStartLoadWithRequest:(NSURLRequest*)request navigationType:(UIWebViewNavigationType)navigationType { url = [request URL]; //CAPTURE USER LINK-CLICK. DirPath=[self applicationDocumentsDirectory]; Durl=[[url absoluteString]copy]; //Checking for Duplicate .FILE at downloaded path.... BOOL success =[[NSFileManager defaultManager] fileExistsAtPath:path]; lastPath=[[url lastPathComponent] copy]; if (success) //if duplicate file found... { UIAlertView* Alert = [[UIAlertView alloc] initWithTitle:@"This FILE is already present in Library." message:@"Do you want to Downlaod again ?" delegate:self cancelButtonTitle:nil otherButtonTitles:@"Yes",@"No",nil]; [Alert show]; [Alert release]; } else //if duplicate file not found directly start download... { // Create the request. NSURLRequest *theRequest=[NSURLRequest requestWithURL:[NSURL URLWithString:Durl] cachePolicy:NSURLRequestUseProtocolCachePolicy timeoutInterval:60.0]; // create the connection with the request and start loading the data NSURLConnection *theConnection=[[NSURLConnection alloc] initWithRequest:theRequest delegate:self]; if (theConnection) { // Create the NSMutableData to hold the received data. receivedData = [[NSMutableData data] retain]; } else { NSLog(@"Inform the user that the connection failed."); } return YES; } - (void)alertView:(UIAlertView *)alertView clickedButtonAtIndex:(NSInteger)buttonIndex { if (buttonIndex == 0) { // Create the request. NSURLRequest *theRequest1=[NSURLRequest requestWithURL:[NSURL URLWithString:Durl] cachePolicy:NSURLRequestUseProtocolCachePolicy timeoutInterval:60.0]; // create the connection with the request and start loading the data NSURLConnection *theConnection1=[[NSURLConnection alloc] initWithRequest:theRequest1 delegate:self]; if (theConnection1) { // Create the NSMutableData to hold the received data. receivedData = [[NSMutableData data] retain]; } else { NSLog(@"Inform the user that the connection failed."); } } else {[alertView dismissWithClickedButtonIndex:1 animated:TRUE];} } - (void)webView:(UIWebView *)webview didFailLoadWithError:(NSError *)error1 { NSLog(@"didFailLoadWithError: %@; stillLoading:%@", error1,(webview.loading?@"NO":@"YES")); } </code></pre> <p>My Log shows: <code>didFailLoadWithError: Error Domain=WebKitErrorDomain Code=102 "Frame load interrupted" UserInfo=0x6b34910 {NSErrorFailingURLKey=MY_URL, NSErrorFailingURLStringKey=MY_URL, NSLocalizedDescription=Frame load interrupted}; stillLoading:YES</code></p> <p><code>DirPath=/Users/krunal/Library/Application Support/iPhone Simulator/5.0/Applications/FCDDDE83-A9B3-4C14-A56C-E8C5FCE7F5C4/Documents/DownloadedFile.epub</code></p> <p><strong>Any help will be appriciated.</strong></p>
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    1. PO
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      1. PTAnswer
    1. This table or related slice is empty.
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    1. USKrunal
    1. USKrunal
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    1. This table or related slice is empty.
    1. This table or related slice is empty.
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    1. PO
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    2. PO
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    3. PO
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    1. VO
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      1. POApp crashes on click of Back button in iPhone
      1. USKrunal
      1. VTBountyStart
    1. COi am not sure but please try to comment "[connection release];" code
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      1. POApp crashes on click of Back button in iPhone
      1. USShamsudheen TK
    2. COA good practice for releasing instance variables is to set them `nil` after you're releasing them and plan to not use them anymore. That way many `EXC_BAD_ACCESS` errors by accidentally accessing the ivar after the release can be prevented.
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      1. POApp crashes on click of Back button in iPhone
      1. USstigi
    3. CO@Ramshad: i tried but still crashes.
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      1. POApp crashes on click of Back button in iPhone
      1. USKrunal
 

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