NSurlconncetion received data length always 0 but file saving works - iphone

Question

Hi i want to show the received bytes in the console.
(void)connection:(NSURLConnection *)connection didReceiveData:(NSData *)data {
[receivedData appendData:data];
NSNumber *resourceLength = [NSNumber numberWithUnsignedInteger:[receivedData length]];
NSLog(#"resourceData length: %d ", [resourceLength intValue]);
if (file) {
[file seekToEndOfFile];
}
[file writeData:data];
}
the file successfully downloads and safed it into docoument dir but the nslog show always
resourceData length: 0
receivedata is NSMutableData *receivedData; in the .h file
the strange thing is that the exceptedbytes work well. here the code for that:
- (void)connection:(NSURLConnection )connection didReceiveResponse:(NSURLResponse)response {
localFilename = [[[url2 absoluteString] lastPathComponent] copy];
NSLog(localFilename);
NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
NSString *documentsDirectory = [paths objectAtIndex:0] ;
NSString *appFile = [documentsDirectory stringByAppendingPathComponent:localFilename];
[[NSFileManager defaultManager] createFileAtPath:appFile contents:nil attributes:nil];
expectedBytes = [response expectedContentLength];
NSLog(#"content-length: %lli Bytes", expectedBytes);
file = [[NSFileHandle fileHandleForUpdatingAtPath:appFile] retain];
if (file) {
[file seekToEndOfFile];
}
}
can somebody help me. i really dont know what i am doing wrong
kind regards
tammo

Answer 1

Have you allocated and initialised receivedData? One usually does
receivedData = [[NSMutableData data] retain];
right after creating an NSURLConnection instance, and then
[receivedData setLength:0];
upon receiving a response via -connection:didReceiveResponse:, and
[receivedData appendData:data];
upon receiving data via -connection:didReceiveData:. This is exemplified in the URL Loading System Programming Guide. If you haven’t instantiated receivedData, it is probably nil and [receivedData length] returns 0 in that case.