Question

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SOLVED: the filename was an autoreleased string no longer available when called at createFileAtPath:

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I’m trying to track the progress of the download of a file and the code I’m trying to implement is this (edited):

 connection = [[NSURLConnection alloc] initWithRequest:urlRequest delegate:self];

    if (connection)
        receivedData = [[NSMutableData data] retain];    

    -(void) connection:(NSURLConnection *)connection didReceiveResponse:(NSURLResponse *)response
{
    [receivedData setLength:0];

    totalBytes = [[NSNumber numberWithLongLong:[response expectedContentLength]] intValue];
    NSLog(@"content-length: %i bytes", totalBytes);
}

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

    int resourceLength = [[NSNumber numberWithUnsignedInteger:[receivedData length]] intValue];
    NSLog(@"receivedData length: %i", resourceLength);
}

-(void) connectionDidFinishLoading:(NSURLConnection *)connection
{
    [fileMgr createFileAtPath:filename contents:receivedData attributes:nil];

    //if instead i write only the Apple example:
    //NSLog(@"Succeeded! Received %d bytes of data",[receivedData length]);
    //there's no SIGABRT
    [receivedData release];
    [connection release];
}

but the createFileAtPath:contents:attributes: just gives SIGABRT:

-[__NSCFData
getFileSystemRepresentation:maxLength:]:
unrecognized selector sent to instance
0x2ba510

* Terminating app due to uncaught exception
‘NSInvalidArgumentException’, reason:
‘-[__NSCFData
getFileSystemRepresentation:maxLength:]:
unrecognized selector sent to instance
0x2ba510’

what am i doing wrong? isn’t this the way to download a file asynchronously ?

2 more things: a) the content-length NSLog is correct. b) if I don’t initWithCapacity:content-lenght in didReceiveResponse and just init, the receivedData length only grows about two times the content-length…

Answer 1

SOLVED: the filename was an autoreleased string no longer available when called at createFileAtPath: