iOS: How to load a portion of a larger file for uploading?

Question

I am working with large instances of ALAsset and I am trying to split the asset up into smaller chunks for uploading.

What is a good approach to split a large file up into smaller chunks without loading the entire file into memory?

Thanks for your response Cole. I realize that this is trivial for most developers, but could you elaborate (perhaps with a simplified code snippet) in an answer. This way I can accept the answer and mark the question as answered. — John Leaveston, Jul 15 '12 at 07:13

score 2 · Accepted Answer · answered Jul 15 '12 at 14:47

I did this in a text editor but it should compile. NSFileHandle is a thin wrapper around the UNIX file utilities.

    #define CHUNK_SIZE 2048

        NSFileHandle *fh = [NSFIleHandle fileHandleForReadingAtPath:<the file path as a 

string>];

    while(YES) {
        NDSata *chunk = [fh readDataOfLength:CHUNK_SIZE];

        NSUInteger length = [chunk length];
        if(length == 0) break; // done

        // send the data
    }
    fh = nil; // under arc this releases the object

Thanks for your answer, David. I was also thinking in the direction of NSFileHandle. I will definitely give this a try. — John Leaveston, Jul 15 '12 at 17:32

iOS: How to load a portion of a larger file for uploading?

1 Answers1