Je reçois EXC_BAD_ACCESS tandis que NSURLREQUEST

Question

Je reçois EXC_BAD_ACCESS pendant que NSURLREQUEST. Je donne l'URL de pdf du serveur au webview par l'intermédiaire de l'actuel bookBookPressed de AppDelegate_iPhone. s'il vous plaît quelqu'un peut-il dire quel est le problème ... Code: -

@class AppDelegate_iPhone; 
@interface PdfShowViewController : UIViewController<UIWebViewDelegate> { 

    UIWebView *pdfWebview; 
    AppDelegate_iPhone *appDelegate; 
    NSMutableData *receivedData; 
    UIActivityIndicatorView *myIndicator; 
    IBOutlet UIProgressView *progress; 

    NSURLRequest* DownloadRequest; 
    NSURLConnection* DownloadConnection; 

    long long bytesReceived; 
    long long expectedBytes; 

} 


@property (nonatomic,retain) UIWebView *pdfWebview; 
@property (nonatomic,retain) UIActivityIndicatorView *myIndicator; 
@property (nonatomic,retain) IBOutlet UIProgressView *progress; 
@property (nonatomic,retain) NSMutableData *receivedData; 
@property (nonatomic, readonly, retain) NSURLRequest* DownloadRequest; 
@property (nonatomic, readonly, retain) NSURLConnection* DownloadConnection; 

-(IBAction)onTapBack; 

@end 


#import "PdfShowViewController.h" 
#import "AppDelegate_iPhone.h" 

@implementation PdfShowViewController 

@synthesize pdfWebview,myIndicator,progress,receivedData,DownloadRequest,DownloadConnection; 

- (void)connection:(NSURLConnection *)connection didReceiveData:(NSData *)data { 
    [receivedData appendData:data]; 

    unsigned char byteBuffer[[receivedData length]]; 
    [receivedData getBytes:byteBuffer]; 
    NSLog(@"Data === %ld",receivedData); 

    NSInteger receivedLen = [data length]; 
    bytesReceived = (bytesReceived + receivedLen); 
    NSLog(@"received Bytes == %f",bytesReceived); 

    if(expectedBytes != NSURLResponseUnknownLength) 
    { 
     NSLog(@"Expected Bytes in if == %f",expectedBytes); 
     NSLog(@"received Bytes in if == %f",bytesReceived); 

     float value = ((float) (bytesReceived *100/expectedBytes))/100; 
     NSLog(@"Value == %f",value); 
     progress.progress=value; 
    } 

} 

- (void)connection:(NSURLConnection *)connection didFailWithError:(NSError *)error { 
    //[connection release]; 
} 

- (void)connection:(NSURLConnection *)connection didReceiveResponse:(NSURLResponse *)response { 
    expectedBytes = [response expectedContentLength]; 
    NSLog(@"%f",expectedBytes); 

} 

- (void)connectionDidFinishLoading:(NSURLConnection *)connection { 

    [myIndicator stopAnimating]; 
    [myIndicator removeFromSuperview]; 

    pdfWebview = [[UIWebView alloc] initWithFrame:CGRectMake(0, 40, 320, 420)]; 
    [pdfWebview setAutoresizingMask:UIViewAutoresizingFlexibleWidth]; 
    [pdfWebview setScalesPageToFit:YES]; 
    [pdfWebview setAutoresizesSubviews:YES]; 

    [pdfWebview loadRequest:DownloadRequest]; 

    [self.view addSubview:pdfWebview]; 

    //[connection release]; 


} 

// Implement viewDidLoad to do additional setup after loading the view, typically from a nib. 
- (void)viewDidLoad { 
    [super viewDidLoad]; 

    appDelegate = (AppDelegate_iPhone *)[[UIApplication sharedApplication] delegate]; 

    myIndicator = [[UIActivityIndicatorView alloc] initWithActivityIndicatorStyle:UIActivityIndicatorViewStyleWhiteLarge]; 
    myIndicator.center = self.view.center; 
    myIndicator.hidesWhenStopped = NO; 
    [self.view addSubview:myIndicator]; 
    [myIndicator startAnimating]; 

    //receivedData = [[NSMutableData alloc] initWithLength:0]; 
    NSLog(@"%@",appDelegate.currentBookPressed); 
    NSString * urlString = [appDelegate.currentBookPressed stringByAddingPercentEscapesUsingEncoding:NSASCIIStringEncoding]; 
    NSLog(@"%@",urlString); 

    NSURL *targetURL = [NSURL URLWithString:urlString]; 
    NSLog(@"%@",targetURL); 

// Here comes Acception 

    DownloadRequest = [NSURLRequest requestWithURL:[NSURL URLWithString:targetURL] cachePolicy:NSURLRequestReturnCacheDataElseLoad timeoutInterval:120.0]; 
    DownloadConnection = [[NSURLConnection alloc] initWithRequest:DownloadRequest delegate:self]; 

    if (DownloadConnection) { 
     receivedData = [[[NSMutableData data]initWithLength:0]retain]; 
    } 

} 

// Override to allow orientations other than the default portrait orientation. 
- (BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)interfaceOrientation { 
    return YES; 
} 


- (void)didReceiveMemoryWarning { 
    [super didReceiveMemoryWarning]; 
} 

- (void)viewDidUnload { 
    [super viewDidUnload]; 
} 
-(IBAction)onTapBack 
{ 
    [self dismissModalViewControllerAnimated:YES]; 
} 

- (void)dealloc { 
    [super dealloc]; 
    [pdfWebview release]; 
    [receivedData release]; 
} 


@end 

Answer 1

Vous devez remplacer la ligne

DownloadRequest = [NSURLRequest requestWithURL:[NSURL URLWithString:targetURL] cachePolicy:NSURLRequestReturnCacheDataElseLoad timeoutInterval:120.0]; 

avec la ligne

DownloadRequest = [NSURLRequest requestWithURL:targetURL cachePolicy:NSURLRequestReturnCacheDataElseLoad timeoutInterval:120.0]; 

Il est parce que la méthode requestWithURL:cachePolicy:timeoutInterval: en premier le paramètre attend l'objet de la classe NSURL. Dans targerURL vous avez exactement celui-là.

En outre, dans la méthode [NSURL URLWithString:targetURL] (si vous en avez besoin), vous devez passer NSString comme premier paramètre, mais vous passez NSURL.

Answer 2

Votre problème dans cette ligne

DownloadRequest = [NSURLRequest requestWithURL:[NSURL URLWithString:targetURL] cachePolicy:NSURLRequestReturnCacheDataElseLoad timeoutInterval:120.0]; 

Le problème dans votre cas se pose parce que paramètre pour + (id)URLWithString:(NSString *)URLString est NSString et vous passez NSURL et méthode essayant d'obtenir la longueur de la chaîne supposée en appelant -length, qui existe pour NSString mais pas pour NSURL.