Just for reference, With the help of Mike Ash I figured out how to do this
sensibly. Note, code typed straight into Mail.app, so it may not be dead
perfect, but it should show the idea:
//When creating the NSURLConnection and parser:
- (void)doMagicParsingStuff
{
NSInputStream *iStream;
NSOutputStream *oStream;
CFStreamCreateBoundPair(NULL, &iStream, &oStream, 4096);
[oStream setDelegate:self];
NSRunLoop *runLoop = [NSRunLoop currentRunLoop];
[iStream scheduleInRunLoop:runLoop forMode:NSDefaultRunLoopMode];
[oStream scheduleInRunLoop:runLoop forMode:NSDefaultRunLoopMode];
finishedLoading = NO;
[iStream open];
[oStream open];
[self setParserStream:oStream];
NSXMLParser *parser = [[[NSXMLParser alloc] initWithStream:iStream]
autorelease];
}
- (void)attemptToWriteToStream
{
NSUInteger written = [[self parserStream] writeBytes:[[self buffer] bytes]
maxLength:[[self buffer] length]];
[[self buffer] replaceBytesInRange:NSMakeRange(0,written) withBytes:""
length:0];
}
// In the output stream delegate:
- (void)stream:(NSStream *)s handleEvent:(NSStreamEvent)event
{
if (NSStreamEventHasSpaceAvailable == event)
{
if (finishedLoading && [[self buffer] length] == 0)
{
[[self parserStream] close];
}
else
{
[self attepmtToWriteToStream];
}
}
}
// In the NSURLConnection Delegate:
- (void)connection:(NSURLConnection *)connection didReceiveData:(NSData *)d
{
[[self buffer] appendData:d];
[self attemptToWriteToStream];
}
- (void)connectionDidFinishLoading:(NSURLConnection *)connection
{
finishedLoading = YES;
}
On 6 Aug 2011, at 12:14, Mikkel Islay wrote:
> You can't hook up NSURLConnection to NSXMLParser like that because it loads
> its data asynchronously. Rather, feed it (a copy of) the NSData object
> generated by NSURLConnection, or bypass NSURLConnection completely and load
> your data via NSInputStream. In either case you will have to verify that the
> data you feed to NSXMLParser is complete.
>
> Mikkel
>
> On 6 Aug 2011, at 12:02, Thomas Davie wrote:
>
>>
>> I'm trying to figure out how to download and parse XML at the same time.
>> NSXMLParser seems to have support for this by providing it with an
>> NSInputStream. However, I see no way to get an NSInputStream that contains
>> the data that an NSURLConnection is downloading.
>
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