Asynchronous ASIHTTPRequest crashing

[Guthook]

I've been trying to get downloads with ASIHTTPRequest working, and so far I've made some progress, but selectors are giving me trouble.

I'm trying to download lists of files from several folders in a S3 bucket. When using synchronous requests, everything works fine, but it stops the app for a few seconds, so I want to use async requests to make the request work in the background. Here's the method that's crashing:

for (int i = 1; i <= numberOfFolders; i++) {
     ASIS3BucketRequest *listRequest = [ASIS3BucketRequest requestWithBucket:bucket];
[listRequest setAccessKey:accessKey];
[listRequest setSecretAccessKey:secretAccessKey];


    NSString *baseDirectory = @"mapTiles/batches";

    NSString *pathToBatch = [NSString stringWithFormat:@"%@/Folder%i", baseDirectory, i];
[listRequest setPrefix:pathToBatch];
        [listRequest setDelegate:self];
[listRequest setDidFinishSelector:@selector(finishedDownloadingTileList:)];
[listRequest setDidFailSelector:@selector(failedDownloadingTileList:)];
        [listRequest startAsynchronous];
}

The two selectors right now do nothing but write "success" or "failure" in NSLog, but the app doesn't make it that far-- just crashes when I call startAsynchronous.

Any pointers for me? The ASI how-to's website got me to this point, but I'm not sure how to get past this. Thanks for any help!

[BrianSlick]

What is the crash message in the console?

[Guthook]

Originally Posted by BrianSlick

What is the crash message in the console?

Dang... I knew I should have included that. I'm away from my computer today, so I'll get that as soon as I get home tonight. I suspect the issue has something to do with setting up the [self] class as a ASIHTTPRequestDelegate or using selectors, since those are two things I haven't fully grasped yet.

[Guthook]

Originally Posted by BrianSlick

What is the crash message in the console?

Okay. Got back to my computer and tried it out, and the console says:
"sharedlibrary apply-load-rules all
(gdb)"

And the debug navigator says "Thread 1: Program received signal: EXC_BAD_ACCESS".

Any clues there?

[BrianSlick]

Not really. Post the entire method.

Also, depending on how many downloads you are firing off, you may want to use a download queue.

[Guthook]

Thanks for looking at this Brian. I should indeed use a queue. I was having trouble figuring out how to get the examples on ASI's website to work, since the examples have a few property variables that I didn't recognize.

Problem solved, though! The method for downloading those lists of files was in its own class, which the mainViewController would create an instance of in order to handle these big downloads. The mainViewController was releasing the instance of the downloader class before the Async (or queue) was done, which seems to be the cause of the crash. I guess I need to declare and release the downloader class somewhere other than where I've been doing that.