Load file

gistfile1.m

 NSString *path;
    NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
    path = [[paths objectAtIndex:0] stringByAppendingPathComponent:@"My Directory"];
    path = [path stringByAppendingPathComponent:@"My Filename"];

    if ([[NSFileManager defaultManager] fileExistsAtPath:path])
    {
        //File exists
        NSData *file1 = [[NSData alloc] initWithContentsOfFile:path];
        if (file1)
        {
            [self MyFunctionWantingAFile:file1];
            [file1 release];

        }
    }
    else
    {
        NSLog(@"File does not exist");
    }