Problems writing to an XML file in Xcode

I created a client-server restaurant project in which I read from an XML file. But I need to write and update the XML file. I faced a lot of problem when I write XML . I searched various websites and forums, but I could not found any solutions. Please help me if anyone knows how to do this.

I wrote the following code to create a sample project which I found from a tutorial. But some errors occur when I build:

Error:NSXMLDocument , NSXmlNode undeclared

I tried adding the Cocoa framework to solve this, but it didn't seem to work.

- (NSData *)constructXMLRequest
{
    NSXMLElement *root = [[NSXMLElement alloc] initWithName:@"Request"];
    [root addAttribute:[NSXMLNode attributeWithName:@"Attribute1" stringValue:@"Value1"]];
    [root addAttribute:[NSXMLNode attributeWithName:@"Attribute2" stringValue:@"Value2"]];
    [root addAttribute:[NSXMLNode attributeWithName:@"Attribute3" stringValue:@"Value3"]];

    NSXMLElement *childElement1 = [[NSXMLElement alloc] initWithName:@"ChildElement1"];
    [root addChild:childElement1];
    [childElement1 release];

    NSXMLElement *childElement2 = [[NSXMLElement alloc] initWithName:@"ChildElement2"];
    [childElement2 addAttribute:[NSXMLNode attributeWithName:@"ChildAttribute2.1" stringValue:@"Value2.1"]];
    [childElement2 setStringValue:@"ChildValue2.1"];
    [root addChild:childElement2];
    [childElement2 release];

    NSXMLDocument *xmlRequest = [NSXMLDocument documentWithRootElement:root];
    [root release];
    NSLog(@"XML Document\n%@", 开发者_如何学运维xmlRequest);
    return [xmlRequest XMLData];
}

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I know this is an old post, but might help someone.

<Cocoa/Cocoa.h> is not supported in iOS.

C out KissXML. Add it to your project, and just change the NSXMLElement to DDXMLElement in the above code.

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Here is Sample code in iOS Reference Library.

SeismicXML

XMLPerformance