didReceiveAuthenticationChallenge沒有被調用使用ftp協議

Question

我一直在我的應用程序的NSURLConnection問題掙扎了幾天。我需要連接到一個服務器（調用getPdfFromServerAtIndex），使用ftp協議來獲得一個對象（一個pdf頁面，但沒關係！）。當我嘗試連接到一個http url時，我沒有問題。同樣的事情需要一個http url請求認證，所有我的委託方法被調用。

但是，當我使用下面顯示的URL，使用ftp協議構建，像didReceiveAuthenticationChallenge，canAuthenticateAgainstProtectionSpace這樣的委託方法永遠不會被調用。

當「while（！finished）」正在循環時，僅調用connectionShouldUseCredentialStorage方法，並且比didFailWithError方法給我的錯誤「連接失敗！錯誤 - 您無權訪問請求的資源ftp://ftp.www.thephilosopher.org/」 。不過，當我嘗試在我的瀏覽器上粘貼ftp url時，我被要求填寫用戶名和密碼。

任何想法爲什麼使用ftp協議我無法驗證和訪問服務器？

-(void)getPdfFromServerAtIndex:(NSUInteger)index{ 

// Create the request. 
// Set finished to false 
finished = FALSE; 

NSString *pageNumber = [NSString stringWithFormat:@"ftp://ftp.www.thephilosopher.org/Iphone/0%i.pdf",index+1]; 

NSURL* nsurl = [NSURL URLWithString:pageNumber]; 
urlReq = [[NSMutableURLRequest alloc] initWithURL:nsurl]; 
BOOL canHandle = [NSURLConnection canHandleRequest:urlReq]; 


NSURLConnection *conn = [[NSURLConnection alloc] initWithRequest:urlReq delegate:self]; 


if (conn && canHandle) { 
    // Create the NSMutableData to hold the received data. 
    // receivedData is an instance variable declared elsewhere. 
    receivedData = [[NSMutableData data] retain]; 
} else { 
    // Inform the user that the connection failed. 
    NSLog(@"Connection Failed!"); 
} 


while(!finished) { 
    [[NSRunLoop currentRunLoop] runMode:NSDefaultRunLoopMode beforeDate:[NSDate distantFuture]];} 
} 

-(void)connectionDidFinishLoading:(NSURLConnection *)connection{ 
finished = TRUE; 

// receivedData is declared as a method instance elsewhere 
NSLog(@"Succeeded! Received %d bytes of data",[receivedData length]); 

// release the connection, and the data object 
[connection release]; 
} 

- (BOOL)connection:(NSURLConnection *)connection canAuthenticateAgainstProtectionSpace:(NSURLProtectionSpace*)tmpProtectionSpace { 
// Check the NSURLProtectionSpace 
return YES;} 

-(NSURLRequest *)connection:(NSURLConnection *)inConnection willSendRequest:(NSURLRequest *)inRequest redirectResponse:(NSURLResponse *)inRedirectResponse{  
if(inRedirectResponse){ 
    NSMutableURLRequest *r = [[urlReq mutableCopy] autorelease]; // original request 
    [r setURL: [inRequest URL]]; 
    return r; 
} else { 
    return inRequest; 
} 
} 

-(BOOL)connectionShouldUseCredentialStorage:(NSURLConnection*)connection{ 
NSLog(@"connectionShouldUseCredentialStorage"); 
return YES; 
} 

-(void)connection:(NSURLConnection *)connection didReceiveAuthenticationChallenge:(NSURLAuthenticationChallenge *)challenge{ 
if([challenge previousFailureCount] == 0) { 
    NSURLCredential *newCredential; 
    newCredential=[NSURLCredential credentialWithUser:@"XXXX" password:@"XXXXX" persistence:NSURLCredentialPersistenceNone]; 
[[challenge sender] useCredential:newCredential forAuthenticationChallenge:challenge];} 
else { 
[[challenge sender] cancelAuthenticationChallenge:challenge]; 
NSLog(@"Bad Username Or Password");} 
} 

- (void)connection:(NSURLConnection *)connection didFailWithError:(NSError *)error{ 
// release the connection, and the data object 
[connection release]; 
// receivedData is declared as a method instance elsewhere 
[receivedData release]; 

// inform the user 
NSLog(@"Connection failed! Error - %@ %@", 
     [error localizedDescription], 
     [[error userInfo] objectForKey:NSURLErrorFailingURLStringErrorKey]); 
} 

- (void)connection:(NSURLConnection *)connection didReceiveData:(NSData *)data{ 

NSLog(@"Data received"); 
[receivedData appendData:data]; 
} 

- (void)connection:(NSURLConnection *)connection didReceiveResponse:(NSURLResponse *)response{ 
NSLog(@"Response received"); 
[receivedData setLength:0]; 
} 

Answer 1

剛剛發出NSURL格式爲 「FTP：//用戶名：密碼@ ip地址/文件路徑/」

你的情況

：ftp://username:password@ftp.www.thephilosopher.org/Iphone/0%i.pdf