Getting Image from URL/server [duplicate]

Question

I'm fairly new to iPhone development and trying to fetch 'Images from Server' in my application.

I'm using the following method to do this:

- (UIImage *)imageFromURLString:(NSString *)urlString 
{
    NSURL *url = [NSURL URLWithString:urlString];
    NSMutableURLRequest *request = [[NSMutableURLRequest alloc] initWithURL:url];
    [request setHTTPMethod:@"GET"];

    NSURLResponse *response = nil;
    NSError *error = nil;
    NSData *result = [NSURLConnection sendSynchronousRequest:request          
    returningResponse:&response error:&error];
    [request release];
    [self handleError:error];
    UIImage *resultImage = [UIImage imageWithData:(NSData *)result];

    NSLog(@"urlString: %@",urlString);
    return resultImage;
}

This function does not return the expected image although I can see in debugger that NSData for the Image object has some value (in bytes)

Although, a very similar function for getting text from server works and I get expected values.

- (NSString *)jsonFromURLString:(NSString *)urlString
{

    NSURL *url = [NSURL URLWithString:urlString];
    NSMutableURLRequest *request = [[NSMutableURLRequest alloc] initWithURL:url];
    [request setHTTPMethod:@"GET"];

    NSURLResponse *response = nil;
    NSError *error = nil;
    NSData *result = [NSURLConnection sendSynchronousRequest:request
    returningResponse:&response error:&error];
    [request release];
    [self handleError:error];
    NSString *resultString = [[NSString alloc] initWithData:result
    encoding:NSUTF8StringEncoding];

    return [resultString autorelease];
}

This method works fine.

Could someone please help me in understanding why I'm not getting the Image from server?

Thanks

Answer 1

If all you are trying to do is grab an image from a web server via a URL there is an easier way.

This is what I use:

UIImage* myImage = [UIImage imageWithData: 
    [NSData dataWithContentsOfURL: 
    [NSURL URLWithString: @"http://example.com/image.jpg"]]];

And if you want to use it on an image view just do the following:

// Let's assume the picture is an instantiated UIImageView
[picture setImage: myImage];
[myImage release];

I'm sure there are reasons why a person might not want to use this approach, but I would start with this and see if it will do what you need it to.

Answer 2

I've written RemoteImage class to load images over the network asynchronously. It also takes care of freeing the memory when necessary. See this post: http://www.dimzzy.com/blog/2009/11/remote-image-for-iphone/