NSURLConnection download large file (>40MB)

Question

I need to download large file (i.e. > 40MB) to my application from server, this file will be ZIP or PDF. I achieved it using NSURLConnection, that works wel

Answer 1

I had the same problem, and seems that I discovered some solution.

In your header file declare:

NSMutableData *webData;
NSFileHandle *handleFile;

In your .m file on downloadFileFromURL when you get the connection initiate the NSFileHandle:

if (theConnection) {

        webData = [[NSMutableData data] retain];

        if (![[NSFileManager defaultManager] fileExistsAtPath:filePath]) {
            [[NSFileManager defaultManager] createFileAtPath:filePath contents:nil attributes:nil];
        }

        handleFile = [[NSFileHandle fileHandleForWritingAtPath:filePath] retain];
    }

then in didReceiveData instead of appending data to memory write it to disk, like this:

- (void)connection:(NSURLConnection *)connection didReceiveData:(NSData *)data {

    [webData appendData:data];

    if( webData.length > SOME_FILE_SIZE_IN_BYTES && handleFile!=nil) {          
        [handleFile writeData:recievedData];
        [webData release];
        webData =[[NSMutableData alloc] initWithLength:0];
    }
}

when the download finish on connectionDidFinishLoading add this lines to write the file and to release connection:

[handleFile writeData:webData];
[webData release];
[theConnection release];

I'm trying it right now, hope it works..