This document provides an overview of Metro style apps and the C++ language features for building them. It compares the architecture and frameworks of Metro style apps to desktop apps. It then summarizes key C++ language features for Metro style development including reference types, memory management, pointers, events, generics and libraries. The document promotes C++ for building high performance Metro style apps and provides examples of key language concepts.

4. Metro style apps

6. View Metro style Apps Desktop Apps
XAML HTML / CSS
Controller
C C# JavaScript
Model
HTML C C#
C++ VB (Chakra) JavaScrip
t C++ VB
WinRT APIs
System Services
Communication Graphics & Devices &
& Data Media Printing
Application Model Internet .NET
Explorer
Win32 / SL
Core
Windows Core OS Services

7. The Sweet Spot for C++…
Power,
Performance
and Portability.

9. XAML

11. Demo

12. Language Basics

15. 1. Person^ p = nullptr;
2. {
3. Person^ newP = ref new Person(); // refcount = 1
4. newP->Name = “John”; // refcount = 1
5. p = newP; // refcount = 2
6. } // refcount = 1
7. p = nullptr; // refcount = 0; ~Person()

16. Key Bindings Feature Summary
1. Data Types ref class Reference type
value class Value type
interface class Interface
property Property with get/set
event “Delegate property” with add/remove/raise
delegate Type-safe function pointer
generic Type-safe generics
2. Allocation ref new Reference-counted allocation
3. Pointer & ^ Strong pointer (“hat” or “handle”)
Reference % Strong reference

18. More Language

19. 1. delegate void CarouselInitDoneHandler(IUIAnimationVariable^ rotation);
2. void CarouselAnimation::Initialize(double angle, CarouselInitDoneHandler^ callback) {
3. // Create Animation Manager
4. using namespace Engine::Graphics;
5. UIAnimationManager animationManager;
6. // Create rotation animation variable
7. IUIAnimationVariable^ rotation = animationManager.CreateAnimationVariable(angle);
8. // Set the event handler for the story board
9. rotation->GetCurrentStoryBoard()->SetStoryBoardEventHandler(
10. ref new CarouselStoryBoardHandler(this, CarouselAnimation::StoryBoard)
11. );
12. // Invoke the callback when done
13. callback(rotation);
14. }

20. public ref class Person {
public: Person(String^ name, String^ email);
void Greet(Person^ other);
internal: ~Person();
void SetPassword(const std::wstring& passwd);
};
Person^ p = ref new Person(“John Surname”);
p->Greet(ref new Person(“Jim Surname”);

21. public interface class IAnimal { public interface class IFeline :
void Play(); IAnimal {
}; void Scratch();
};
IAnimal^ animal = ref new Cat(); ref class Cat : IFeline {
animal->Play(); public: virtual void Play();
virtual void Scratch();
};

22. public ref class DatabaseConnection {
public: ~ DatabaseConnection();
};
{
DatabaseConnection db();
db.SetName( “Employees”);
// …
// … lots of queries, updates, etc. …
// …
} // ~DatabaseConnection()

23. public: property String^ Name;
public: property Person^ Sibling {
Person^ get() { InitSiblings(); return _sibling; }
void set(Person^ value) { _sibling = value; NotifySibling(); }
}
private: Person^ _sibling;
Person^ p = ref new Person(“John”);
p->Sibling = ref new Person(p->Name);

24. public delegate void PropertyChanged( String^ propName, String^ propValue );
auto p = ref new PropertyChanged(
[](String^ pn, String^ pv) {
cout << pn << ” = “ << pv;
} );
auto p = ref new PropertyChanged( UIPropertyChanged );
auto p = ref new PropertyChanged( this, MainPage::OnPropertyChanged );
p( “Visible”, false );

25. public: event PropertyChanged^ OnPropertyChanged;
public: event PropertyChanged^ OnNetworkChanged {
EventRegistrationToken add(PropertyChanged^);
void remove(EventRegistrationToken t);
void raise(String^, String^);
}
person->OnPropertyChanged += propertyChangedDelegate;
auto token = person->OnPropertyChanged::add(propertyChangedDelegate);
person->OnPropertyChanged -= token;
person->OnPropertyChanged::remove(token);

26. HRESULT Exception
E_OUTOFMEMORY OutOfMemoryException
E_INVALIDARG InvalidArgumentException
E_NOINTERFACE InvalidCastException
E_POINTER NullReferenceException
E_NOTIMPL NotImplementedException
E_ACCESSDENIED AccessDeniedException
throw ref new InvalidArgumentException(); E_FAIL FailureException
throw ref new COMException(E_*); E_BOUNDS OutOfBoundsException
E_CHANGED_STATE ChangedStateException
REGDB_E_CLASSNOTREG ClassNotRegisteredException
try { … } catch (OutOfMemoryException^ ex) E_DISCONNECTED
{ … }
E_ABORT
DisconnectedException
OperationCanceledException
ex->HResult
• catch (Platform::Exception^)

27. generic<typename T, typename U> ref class PairStringUri:
public interface class IPair { IPair<String^, Uri^> {
property T First; public:
property U Second; property String^ First;
}; property Uri^ Second;
};
IPair<String^, Uri^>^ uri = GetUri();
auto first = uri->First; // type is String^
auto second = uri->Second; // type is Uri^

28. template<typename T, typename U>
ref class Pair: IPair<T, U>
{
public:
property T First;
property U Second;
Pair(T first, U second) { First = first; Second = second; }
};
IPair<String^, Uri^>^ pair = ref new Pair<String^, Uri^>(
“//BUILD/”, ref new Uri(“http://www.buildwindows.com”));

29. #using <Company.Component.winmd>
public

30. private partial ref class MainPage: UserControl, IComponentConnector
{
public:
void InitializeComponent();
void Connect() { btn1->Click += ref new EventHandler(this, &MainPage::Button_Click); }
};
ref class MainPage
{
public:
MainPage() { InitializeComponent(); }
void Button_Click(Object^ sender, RoutedEventArgs^ e);
};

31. Libraries

32. using namespace Platform;
Vector<String^>^ items = ref new Vector<String^>();
items->Append(“Hello”);
• Returning a read-only view of the vector
IVectorView<String^>^ GetItems () {
return items->GetView();
}
items->VectorChanged +=
ref new VectorChangedEventHandler<String^>
(this, &MyClass::VectorChanged);

33. using namespace Platform;
Map<String^, Uri^> favorites = ref new Map<String^, Uri^>();
favorites->Insert(“MSDN”, ref new Uri(“http://msdn.com”));
if (favorites->HasKey(“MSDN”))
favorites->Remove(“MSDN”);

34. Begin()/End()
std::vector<int> v;
begin() end() v.push_back(10);
auto items = ref new Vector<int>(v);
IVector<int>^ v = GetItems();
int sum = 0; Vector<int>^ items = …;
std::for_each( begin(v), end(v), std::vector<int> v = to_vector(items);
[&sum](int element) {
sum += element;
} );

36. Building your first Windows Metro style app
Roadmap for creating Metro style apps
Tour of the IDE
• XAML designer
C++ Reference for Windows Runtime
Windows Runtime Components in C++
Asynchronous Programming in C++ Using PPL

37. (Since 10th of January 2012)
http://BeCPP.org/
Aim? quarterly meetings
Audience? free for everyone
Where? At Microsoft offices in Zaventem or at sponsor company
locations (we’re still looking for hosts / sponsors!)
Announcements? subscribe to our blog to stay up-to-date
Questions? BeCPP@BeCPP.org
or visit the TechDays MEET Corner during breaks

38. MICROSOFTC++
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PARTICIPATE IN C++
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39. http://aka.ms/mbl-win8
http://aka.ms/mbl-win8/build
http://aka.ms/mbl-win8/devprev
http://aka.ms/mbl-win8/store