Downloading large videos gives memory warning - iphone

Question

-(void)connection:(NSURLConnection *)connection didReceiveData:(NSData *)data
{
if(data != nil){
//open output stream
NSOutputStream *stream=[[NSOutputStream alloc] initToFileAtPath:_filePath append:YES];
[stream open];
NSString *str=(NSString *)data;
//write to file
NSUInteger left = [str length];
NSUInteger bytesWritten = 0;
do {
bytesWritten = [stream write:[data bytes] maxLength:left];
downloadedData = downloadedData + bytesWritten;
if (-1 == bytesWritten) break;
left -= bytesWritten;
} while (left > 0);
if (left) {
NSLog(#"stream error: %#", [stream streamError]);
[self handleForCurreptedDownloading];
}
[stream close];
}
else{
NSLog(#"data nil");
}
}
Tried with this code also but not working as it is giving same memory warning
downloadedData += [data length];
NSFileHandle *fileHandle = [NSFileHandle fileHandleForUpdatingAtPath:_filePath];
[fileHandle seekToEndOfFile];
[fileHandle writeData:data];
[fileHandle closeFile];
This is the code i have used with fileSystem i am directly writing and appending into file. I have also used ARC. Still it is giving memory warning and getting crashed when i try to download large video files.
I have also checked before downloading the disk space
+ (NSNumber *)getFreeSpace
{
// float freeSpace = 0.0f;
NSError *error = nil;
NSArray *paths = NSSearchPathForDirectoriesInDomains(NSCachesDirectory, NSUserDomainMask, YES);
NSDictionary *dictionary = [[NSFileManager defaultManager] attributesOfFileSystemForPath:[paths lastObject] error: &error];
NSNumber *fileSystemFreeSizeInBytes = 0;
if (dictionary) {
fileSystemFreeSizeInBytes = [dictionary objectForKey: NSFileSystemFreeSize];
// freeSpace = [fileSystemFreeSizeInBytes floatValue];
} else {
//Handle error
}
return fileSystemFreeSizeInBytes;
}
I have checked with allocations and it is giving me the stable graph.
Is there any other way to download and manage large video files?

Answer 1

You are getting the complete downloaded file data in the didReceiveData function - which probably is HUGE.
I would use a framework like AFNetworking for your download needs, it makes things a lot simpler.
For example, for downloading large files without getting the whole data at once and then write it to a file, use a NSOutputStream to write parts of the file while they are downloaded.
This is from the AFNetworking documentation:
operation.outputStream = [NSOutputStream outputStreamToFileAtPath:#"download.zip" append:NO];