didReceiveAuthenticationChallenge没有被调用使用ftp协议

Question

我一直在我的应用程序的NSURLConnection问题挣扎了几天。我需要连接到一个服务器（调用getPdfFromServerAtIndex），使用ftp协议来获得一个对象（一个pdf页面，但没关系！）。当我尝试连接到一个http url时，我没有问题。同样的事情需要一个http url请求认证，所有我的委托方法被调用。

但是，当我使用下面显示的URL，使用ftp协议构建，像didReceiveAuthenticationChallenge，canAuthenticateAgainstProtectionSpace这样的委托方法永远不会被调用。

当“while（！finished）”正在循环时，仅调用connectionShouldUseCredentialStorage方法，并且比didFailWithError方法给我的错误“连接失败！错误 - 您无权访问请求的资源ftp://ftp.www.thephilosopher.org/” 。不过，当我尝试在我的浏览器上粘贴ftp url时，我被要求填写用户名和密码。

任何想法为什么使用ftp协议我无法验证和访问服务器？

-(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

刚刚发出NSURL格式为 “FTP：//用户名：密码@ ip地址/文件路径/”

你的情况

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