> On Apr 9, 2015, at 12:37 AM, Daryle Walker <dary...@mac.com> wrote: > > NSProgress, one of those APIs too new to be well used. Does anyone know how > to use it with a downloading task?
Hey! I just started using NSProgress too, yesterday. > One problem is that it’s a secret which API groups support NSProgress. …and I just ran into this too. The really annoying part is when you make an NSProgress current because you want to add a child, but while it’s current you call a system API that itself uses NSProgress, so you end up adding multiple children to your top-level object, which completely screws up the fractionComplete calculation. > But I don’t know if NSFileManager supports NSProgress, nor where to insert > manual calls if it doesn’t. Apparently it does; it’s the API that I alluded to above. At least, the -createFileAtPath: method uses NSProgress. NSFileManager isn’t the best API for writing a downloaded file, though. If you’re downloading incrementally, use NSFileHandle or something like it (or just plain old fopen / fwrite / fclose.) You’d put the NSProgress calls in the NSURLSession delegate methods. Every time you receive a chunk of data, first write it to the file, then add the length of the chunk to the progress’s completedUnitCount. —Jens
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