Question

I am trying to set up a NSURLRequest to download a simple index.html with its externa style.css sheet but I am not quite sure how to do this.. I have only ever just formatted the URL of the request to the file I want.. but this has to be slightly different and I cannot find a good example of what I am trying to do.

this is my code so far:

#pragma mark - NSURLConnection methods

- (void)htmlRequest
{
    // Create the request.
    NSURLRequest *theRequest=[NSURLRequest requestWithURL:[NSURL URLWithString:@"http://www.mywebsite.com/index.html"]
                                              cachePolicy:NSURLRequestReloadIgnoringCacheData
                                          timeoutInterval:60.0];

    // create the connection with the request
    // and start loading the data
    NSURLConnection *theConnection=[[NSURLConnection alloc] initWithRequest:theRequest delegate:self];
    if (theConnection) {
        // Create the NSMutableData to hold the received data.
        // receivedData is an instance variable declared elsewhere.
        receivedData = [NSMutableData data];
    } else {
        // Inform the user that the connection failed.
        NSLog(@"Connection Fail");
    }
}


- (void)connection:(NSURLConnection *)connection didReceiveResponse:(NSURLResponse *)response
{
    // 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
{

    // Append the new data to receivedData.
    // receivedData is an instance variable declared elsewhere.
    [receivedData appendData:data];
}

- (void)connection:(NSURLConnection *)connection didFailWithError:(NSError *)error
{
    // inform the developer of error type

}

// This method uses methodName to determin which Initalizer method to send the response data to in EngineResponses.m
- (void)connectionDidFinishLoading:(NSURLConnection *)connection
{
//    EngineResponses *engineResponses = [EngineResponses sharedManager];

//        [engineResponses GetManufacturers:receivedData];

    NSString *myString = [[NSString alloc] initWithData:receivedData encoding:NSUTF8StringEncoding];
    NSLog(@"%@", myString);

}

as you can see I am just calling index.html directly.. I would like to know how to format my request so i get the index.html as well as style.css

any help would be greatly appreciated.

Answer 1

I always create a new data structure,which has a -connection property and a -request property,like this

@interface connectionWrapper : NSObject
@property(retain) NSURLRequest *request
@property(retain) NSURLConnection *connection

by retaining this data structure in an mutable array, you can distinguish the connections in callback methods by iterate the array and compare each connectionWrapper instance’s -connection property with the connection parameter the of the callback method, if they match(points to a same object), then you can retrieve the -request property of the connectionWrapper instance, then -url property of NSURLRequest instance.

as I’m not an native English speaker, I think code is a better tutor.

-(NSURLRequest*)getRequestByConnection:(NSURLConnection*)connection
{
    for(connectionWrapper *w in theArrayContainingAllConnectionWrappers)
    {
        if(w == connection)
            return w.request;
    }
}

In callback method:

-(void)connection:(NSURLConnection*)connection didReceiveResponse(NSURLResponse*)response
{
    NSURLRequest *request = [self getRequestByConnection:connection];
    NSURL *url = [request url];
    /*apply different approach to different url/*
}

PS:it’s very sad that NSURLConnection don’t have a -request property so that we can retrieve the request associated with the connection easily.