Uploading Large NSData to the Web

Question

I\'m currently working on an application that has to upload large files (mainly movies/videos) to the web. After reading what I can, I went the the approach of converting t

Answer 1

In case anyone got here and couldn't solve your problems, I figured out a way to do this. You have to firstly write your ALAssetRepresentation to disk (as described here):

NSUInteger chunkSize = 100 * 1024;
NSString *tempFile = [NSTemporaryDirectory() stringByAppendingPathComponent:@"temp.tmp"];

uint8_t *chunkBuffer = malloc(chunkSize * sizeof(uint8_t));
NSUInteger length = [rep size];

NSFileHandle *fileHandle = [[NSFileHandle fileHandleForWritingAtPath: tempFile] retain];
if(fileHandle == nil) {
    [[NSFileManager defaultManager] createFileAtPath:tempFile contents:nil attributes:nil];
    fileHandle = [[NSFileHandle fileHandleForWritingAtPath:tempFile] retain];
}

NSUInteger offset = 0;
do {
    NSUInteger bytesCopied = [rep getBytes:chunkBuffer fromOffset:offset length:chunkSize error:nil];
    offset += bytesCopied;
    NSData *data = [[NSData alloc] initWithBytes:chunkBuffer length:bytesCopied];
    [fileHandle writeData:data];
    [data release];
} while (offset < length);
[fileHandle closeFile];
[fileHandle release];
free(chunkBuffer);
chunkBuffer = NULL;

Then you have to create an NSData object that can map the disk without using memory resources (kind of like David's answer, but inspired by this answer):

NSError *error;
NSData *fileData = [NSData dataWithContentsOfFile:tempFile options:NSDataReadingMappedIfSafe error:&error];
if (!fileData) {
    NSLog(@"Error %@ %@", error, [error description]);
    NSLog(@"%@", tempFile);
    //do what you need with the error
}

EDIT Although, if you are uploading the file somewhere, you should open a connection and send small buffers of the file, kind of like what I did above. I had to write a C++ class to handle the socket and the connection