App crashed when downloading video - iphone

Question

In my app im downloading some videos using NSURLConnection. It shows two memory warnings.
Received memory warning. Level=1
Received memory warning. Level=2
And then after sometime the App Crashes is there any way to solve this issue.
Can anyone help me with this issue.
Thanks in advance.
Code i used:
NSURLRequest *theRequest=[NSURLRequest requestWithURL:[NSURL URLWithString:[exer1 objectAtIndex:i-1]]cachePolicy:NSURLRequestUseProtocolCachePolicy
timeoutInterval:60.0];
NSLog(#"%# urlrequest ",theRequest);
NSURLConnection *theConnection=[[NSURLConnection alloc] initWithRequest:theRequest delegate:self startImmediately:YES];
HUD = [[MBProgressHUD showHUDAddedTo:self.view animated:YES] retain];
HUD.labelText =[NSString stringWithFormat:#"Downloading %d Video",[exer1 count]-(i-1)];
if (theConnection) {
// Create the NSMutableData to hold the received data.
// receivedData is an instance variable declared elsewhere.
receivedData = [[NSMutableData data] retain];
} else {
// Inform the user that the connection failed.
}
}
}
- (void)connection:(NSURLConnection *)connection didReceiveResponse:(NSURLResponse *)response
{
expectedLength = [response expectedContentLength];
currentLength = 0;
HUD.mode = MBProgressHUDModeDeterminate;
NSLog(#"%d expectedLength",expectedLength);
// This method is called when the server has determined that it
// has enough information to create the NSURLResponse.
// It can be called multiple times, for example in the case of a
// redirect, so each time we reset the data.
// receivedData is an instance variable declared elsewhere.
[receivedData setLength:0];
}
- (void)connection:(NSURLConnection *)connection didReceiveData:(NSData *)data
{
currentLength += [data length];
HUD.progress = currentLength / (float)expectedLength;
// Append the new data to receivedData.
// receivedData is an instance variable declared elsewhere.
[receivedData appendData:data];
}
- (void)connection:(NSURLConnection *)connection
didFailWithError:(NSError *)error
{
[HUD hide:YES];
// release the connection, and the data object
// [connection release];
// receivedData is declared as a method instance elsewhere
// [receivedData release];
// inform the user
NSLog(#"Connection failed! Error - %# %#",
[error localizedDescription],
[[error userInfo] objectForKey:NSURLErrorFailingURLStringErrorKey]);
if(tempz == 1){
tempz =0;
UIAlertView *alert = [[UIAlertView alloc]initWithTitle:#"The Internet connection appears to be offline." message:nil delegate:self cancelButtonTitle:#"ok" otherButtonTitles:nil, nil];
[alert show];
[alert release];
}
}
- (void)connectionDidFinishLoading:(NSURLConnection *)connection
{
NSError *err;
NSFileManager *fman = [NSFileManager defaultManager];
NSString *path = [[[fman URLsForDirectory:NSDocumentDirectory inDomains:NSUserDomainMask] lastObject] path];
NSDictionary *fattr = [fman attributesOfFileSystemForPath:path error:&err];
//Error checking
NSUInteger freeSize = [[fattr objectForKey:NSFileSystemFreeSize] unsignedIntegerValue];
NSLog(#"Free Space %d", freeSize);
NSArray* paths1 = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
struct statfs tStats;
statfs([[paths1 lastObject] cString], &tStats);
float total_space = (float)(tStats.f_blocks * tStats.f_bsize);
NSLog(#"%f total_space",total_space);
[SavedVid addObject:[exer1 objectAtIndex:i-1]];
NSUserDefaults *currentDefaults6 = [NSUserDefaults standardUserDefaults];
[currentDefaults6 setObject:[NSKeyedArchiver archivedDataWithRootObject:SavedVid] forKey:#"SavedVid"];
[currentDefaults6 synchronize];
NSString* cacheDirectory = [NSHomeDirectory() stringByAppendingString:#"/Library/Caches"] ;
/* NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
NSString *documentsDirectory = [paths objectAtIndex:0];
NSLog(#"%# documentsDirectory",documentsDirectory);
if (!documentsDirectory) {
NSLog(#"Documents directory not found!");
}
*/
NSString *file2 = [NSString stringWithFormat:#"%#/%#.mp4",cacheDirectory,[elementw.description objectAtIndex:i-1]];
/* NSLog(#"%# documentsDirectory",file2);
NSLog(#"%# ---- i elementw.description ---- %d ",elementw.description,i);
*/
[receivedData writeToFile:file2 atomically:YES];
NSLog(#" %# file 2 ",file2);
HUD.customView = [[[UIImageView alloc] initWithImage:[UIImage imageNamed:#"tick.png"]] autorelease];
HUD.mode = MBProgressHUDModeCustomView;
[HUD hide:YES afterDelay:2];
[self initializPlayer];
// release the connection, and the data object
// [connection release];
// [receivedData release];
}

Answer 1

When the data is received, you need to store it in a temporary (or not-so-temporary) file. The problem is that the whole file is being download into memory, which would consume most of the memory.
The application crashes because it's using too much memory, so writing to a file is the best option.
Something like this:
- (void)connection:(NSURLConnection *)connection didReceiveData:(NSData *)data {
currentLength += [data length];
HUD.progress = currentLength / (float)expectedLength;
NSString *temporaryFile = [NSString stringWithFormat:#"%#/fileDownload.part", NSTemporaryDirectory()];
if (![[NSFileManager defaultManager] fileExistsAtPath:temporaryFile]) {
[[NSFileManager defaultManager] createFileAtPath:temporaryFile contents:nil attributes:nil];
}
NSFileHandle *fileHandle = [NSFileHandle fileHandleForUpdatingAtPath:temporaryFile];
[fileHandle seekToEndOfFile];
[fileHandle writeData:data];
[fileHandle closeFile];
if (currentLength == expectedLength) {
//read from the file stored at temporaryFile
//perhaps move to a permanent location and change
//its file name and extension.
}
}

Answer 2

I think you are keeping the Video in your memory. Depending on the size it can cause memory problems.