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Listing 14-5. Validating the Monsters.xml File Using DTD using namespace System; using namespace System::Xml; using namespace System::Xml::Schema; ref class ValidateXML { public: ValidateXML(String ^filename) { XmlReader ^vreader; try { XmlReaderSettings ^settings = gcnew XmlReaderSettings(); settings->ProhibitDtd = false; settings->ValidationType = ValidationType::DTD; vreader = XmlReader::Create(filename, settings); while(vreader->Read()) { // ... Process nodes just like XmlTextReader() } Console::WriteLine("Finished Processing"); } catch (Exception ^e) { Console::WriteLine(e->Message); } finally { if (vreader->ReadState != ReadState::Closed) { vreader->Close(); } } } }; void main() { Console::WriteLine("Bad Monsters file"); Console::WriteLine("-----------------"); gcnew ValidateXML("BadMonsters.xml"); Console::WriteLine("\nGood Monsters file"); Console::WriteLine("------------------"); // Note this is a custom Monsters.xml because it needs: // <!DOCTYPE MonsterList SYSTEM "Monsters.dtd"> // added to it for validation gcnew ValidateXML("Monsters.xml"); }

Listing 14-6 shows in a minimal fashion how to validate an XML file with an XSD. Listing 14-6. Validating the Monsters.xml File Using XSD using namespace System; using namespace System::Xml; using namespace System::Xml::Schema; ref class ValidateXML { public: ValidateXML(String ^filename) { XmlReader ^vreader; try { XmlReaderSettings ^settings = gcnew XmlReaderSettings(); settings->ValidationType = ValidationType::Schema; settings->Schemas->Add(nullptr, "..\\Monsters.xsd"); vreader = XmlReader::Create(filename, settings); while(vreader->Read()) { // ... Process nodes just like XmlTextReader() } Console::WriteLine("Finished Processing"); } catch (Exception ^e) { Console::WriteLine(e->Message); } finally { if (vreader->ReadState != ReadState::Closed) { vreader->Close(); } } } }; void main() { Console::WriteLine("Bad Monsters file"); Console::WriteLine("-----------------"); gcnew ValidateXML("BadMonsters.xml"); Console::WriteLine("\nGood Monsters file"); Console::WriteLine("------------------"); gcnew ValidateXML("..\\Monsters.xml"); }

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#define SYNTHESIZE_SINGLETON_FOR_CLASS(classname) \ \ static classname *shared##classname = nil; \ \ + (classname *)shared##classname \ { \ @synchronized(self) \ { \ if (shared##classname == nil) \ { \ shared##classname = [[self alloc] init]; \ } \ } \ \ return shared##classname; \ } \ \ + (id)allocWithZone:(NSZone *)zone \ { \ @synchronized(self) \ { \ if (shared##classname == nil) \ { \ shared##classname = [super allocWithZone:zone]; \ return shared##classname; \ } \ } \ \ return nil; \ } \ \ - (id)copyWithZone:(NSZone *)zone \ { \ return self; \ } \ \ - (id)retain \ { \ return self; \ } \ \ - (NSUInteger)retainCount \ { \ return NSUIntegerMax; \ } \ \ - (void)release \ { \

Caution The server name must be a name from the list of servers known by the local machine. In this

As you can see, there isn t much difference between implementing validation using DTD or XSD. The difference is two lines: settings->ProhibitDtd = false; settings->ValidationType = ValidationType::DTD; versus settings->ValidationType = ValidationType::Schema; settings->Schemas->Add(nullptr, "..\\Monsters.xsd"); Since the DTD file location is embedded directly in the XML file, all you have to do is set XmlReaderSettings s ValidationType property to ValidationType::DTD. You also have to set the ProhibitDtd property to false or you will get a rather ugly security exception.

For XSD validation, you set XmlReaderSettings s ValidationType property to ValidationType::Schema, and you also have to let it know which schema or schemas you want to apply. You do this by adding your XSD schema to the XmlReaderSettings s XmlSchemaSet collection Schemas. Because the autogenerated XSD file does not include a targetNamespace attribute, when adding a schema you set the first parameter to nullptr. If you were to add a targetNamespace attribute in your XSD, you would have to include it in the first parameter and in your XML file. Therefore, if the XSD started with <xs:schema attributeFormDefault="unqualified" elementFormDefault="qualified" targetNamespace="http://www.procppcli.net/monsters" xmlns:xs="http://www.w3.org/2001/XMLSchema"> your XML file would need the following change: <MonsterList xmlns="http://www.procppcli.net/monsters"> and your Schemas->Add line would be settings->Schemas->Add("http://www.procppcli.net/monsters", "..\\Monsters.xsd"); As you can also see, there isn t much difference between implementing a simple XmlReader and a validated XmlReader. In fact, the only difference is that an instance of the XmlReaderSettings class is created and passed as a parameter to the XmlReader class s Create() method. When you run this on the Monsters.xml file listed earlier, Finished Processing displays on the console. To test that validation is happening, create an invalid XML file with an Easy Monster with its HitDice element placed after the Weapon element, as shown in Listing 14-7.

case, kiona was the specified server name. However, there are numerous occasions when you may not be working on your local network and instead need to enter an IP address to reach the server. If you do this, you must supply the IP address as the server name.

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