Download PDF Files in background

[TheFrenchGuy]

Hello,

Today i download pdf files in background and save it like this :

-(void)savePdfFile:(NSString *)object
{
    NSAutoreleasePool * pool=[[NSAutoreleasePool alloc] init];
    NSString * theFileName=[NSString stringWithFormat:@"%@.pdf",[[object lastPathComponent] stringByDeletingPathExtension]];
    NSArray *paths2 = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
    NSString *documentsDirectory2 = [paths2 objectAtIndex:0];
    NSString *pdfPath2 = [documentsDirectory2 stringByAppendingPathComponent:theFileName];
    //test if file exists
    BOOL fileExists = [[NSFileManager defaultManager] fileExistsAtPath:pdfPath2];

    if (!fileExists) 
    {
        DebugLog(@"file n'existe pas");
        NSURL *urlFile = [NSURL URLWithString:object];
        NSData *data = [NSData dataWithContentsOfURL:urlFile];
        NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
        NSString *documentsDirectory = [paths objectAtIndex:0];
        NSString *pdfPath = [documentsDirectory stringByAppendingPathComponent:theFileName];
        [data writeToFile:pdfPath atomically:YES];
    }   
    [pool release];
}

Some people said that it is not very. They say that's i need to use NSURLConnection. But my method is not good ?
How do i do ??
Thank you in advance.