ASIHTTPRequest set下載目標路徑失敗

Question

我有一種方法尋找某個pdf，如果它沒有在本地找到它，它使用ASIHTTPRequest異步下載它。但是，如果行 [request setDownloadDestinationPath:currentDetailItem]; 未註釋，請求將始終失敗，請求開始並且進度增加，直到100％，然後執行請求失敗塊。

這是相關NSLogs請求失敗時：

2012-08-16 12:08:34.398 XXXX[1675:707] Request started with url :http://XXXX.com/gwas/sites/default/files/Responding%20to%20Severe%20Weather%20Events.pdf 
filePath :/var/mobile/Applications/322C24CF-9664-403D-9CC5-13C396F39F84/Documents/Responding%20to%20Severe%20Weather%20Events.pdf 
2012-08-16 12:08:39.018 XXXX[1675:707] Request failed:HTTP/1.1 200 OK 

下面是方法的代碼：

- (void)setDetailItem:(NSString *)newDetailItem { 
    NSArray *downloadPaths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES); 
    NSArray *components = [newDetailItem componentsSeparatedByString:@"/"]; 
    NSString *filePath = [[downloadPaths objectAtIndex:0] stringByAppendingFormat:@"/%@", [components lastObject]]; 
    currentDetailItem = filePath; 

    if (![self fileExistsLocally:[components lastObject]]) { 
     //Download the file 
     [self displayProgressView]; 
     ASIHTTPRequest *request = [ASIHTTPRequest requestWithURL:[NSURL URLWithString:newDetailItem]]; 
     [request setDownloadDestinationPath:currentDetailItem]; 
     [request setDownloadProgressDelegate:progressBar]; 
     [request setCompletionBlock:^ 
     { 
      [self showPdf:currentDetailItem]; 
      [self hideProgressView]; 
      NSLog(@"%f, Request finished :%@", progressBar.progress, request.responseStatusMessage); 
     }]; 
     [request setFailedBlock:^ 
     { 
      NSLog(@"Request failed:%@", request.responseStatusMessage); 
      [self hideProgressView]; 
      [SVProgressHUD showErrorWithStatus:@"Request failed"]; 
     }]; 
     [request startAsynchronous]; 

     NSLog(@"Request started with url :%@\nfilePath :%@", newDetailItem, currentDetailItem); 
    } 
    else { 
     [self showPdf:currentDetailItem]; 
    } 
} 

如果我評論該線路[request setDownloadDestinationPath:currentDetailItem];出來，請求成功。有任何想法嗎？謝謝！

Answer 1

對於任何人誰是有興趣的，我通過交換到NSURLConnection的解決了這一問題，下面的代碼：

- (void)setDetailItem:(NSString *)newDetailItem { 
    NSArray *downloadPaths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES); 
    NSArray *components = [newDetailItem componentsSeparatedByString:@"/"]; 
    NSString *filePath = [[downloadPaths objectAtIndex:0] stringByAppendingFormat:@"/%@", [components lastObject]]; 
    currentDetailItem = filePath; 

    if (![self fileExistsLocally:[components lastObject]]) { 
     [self displayProgressView]; 
     data_ = [[NSMutableData alloc] init]; 
     NSURLRequest *urlRequest = [NSURLRequest requestWithURL:[NSURL URLWithString:newDetailItem] cachePolicy:NSURLRequestUseProtocolCachePolicy timeoutInterval:60.0]; 
     NSURLConnection *connection = [[NSURLConnection alloc] initWithRequest:urlRequest delegate:self startImmediately:YES]; 
     if (!connection) { 
      [SVProgressHUD showErrorWithStatus:@"Request failed"]; 
      return; 
     } 
     else { 
      data_ = [[NSMutableData alloc] init]; 
     } 
    } 
    else { 
     [self showPdf:currentDetailItem]; 
    } 
} 

#pragma mark NSURLConnectionDelegate methods 

- (void)connection: (NSURLConnection*) connection didReceiveResponse: (NSHTTPURLResponse*) response 
{ 
    if ([response statusCode] == 200) { 
     currentDownloadSize = [response expectedContentLength]; 
    } 
    [data_ setLength:0]; 
} 

- (void) connection: (NSURLConnection*) connection didReceiveData: (NSData*) data 
{ 
    [data_ appendData:data]; 
    progressBar.progress = ((float) [data_ length]/(float) currentDownloadSize); 

} 

- (void)connectionDidFinishLoading:(NSURLConnection *)connection 
{ 
    //Save file locally 
    NSURL *url = [NSURL fileURLWithPath:currentDetailItem]; 
    NSError *error = nil; 
    [data_ writeToURL:url options:0 error:&error]; 
    if (error) { 
     NSLog(@"Write failed with error:%@", error); 
    } 
    else { 
     NSLog(@"Request successful"); 
     [self showPdf:currentDetailItem]; 
    } 

    [self hideProgressView]; 
} 

- (void)connection:(NSURLConnection *)connection 
    didFailWithError:(NSError *)error 
{ 
    [self hideProgressView]; 
    [SVProgressHUD showErrorWithStatus:@"Request failed"]; 
    NSLog(@"Connection failed! Error - %@ %@", 
      [error localizedDescription], 
      [[error userInfo] objectForKey:NSURLErrorFailingURLStringErrorKey]); 
}