How to use DispatcherTimer class with C++?

Question

I can ref new a DispatcherTimer object in my metro CPP project,but I have no idea how to fire it up?

and how to declare the TimeSpan,Tick and Interval? any demo with CPP?

Answer 1

using namespace Windows::UI::Xaml;
using namespace Windows::Foundation;

void Application1::MainPage::Button_Click(Platform::Object^ sender, Windows::UI::Xaml::RoutedEventArgs^ e)
{
	DispatcherTimer^ timer = ref new DispatcherTimer;
	timer->Tick += ref new Windows::UI::Xaml::EventHandler(this, &Application1::MainPage::DispatcherTimer_Tick);
	TimeSpan t;
	t.Duration=1000;
	timer->Interval = t;
	timer->Start();
}

void Application1::MainPage::DispatcherTimer_Tick(Platform::Object^ sender, Platform::Object^ e)
{
   // TO DO...
}

Just declare the DispatcherTimer, and register one event handler on it.

---

Bob Bao [MSFT]
MSDN Community Support | Feedback to us

Answer 2

In Windows 8 Metro

timer->Tick += ref new Windows::UI::Xaml::EventHandler(this, &Application1::MainPage::DispatcherTimer_Tick);

The Windows::UI::Xaml::EventHandler generated an error: expected a type specifier.

And timer->Tick += timer->Tick generated an add error.

---

Charlie Chang L

Answer 3

The sample code in this thread is from the Developer Preview. The EventHandler type moved to Windows::Foundation. 

        dispatcherTimer->Tick += ref new Windows::Foundation::EventHandler<Object^>(this, &Application1::DispatcherTimer_Tick); 

--Rob
   

Answer 4

Great. That DispatcherTimer += worked. But

timer->Tick += timer->Tick

worked in C# generates a syntax error in C++. Any solution?

---

Charlie Chang L

Answer 5

What are you trying to do with timer->Tick += timer->Tick? That doesn't look like it should work in either C# or C++.

To set a Tick event handler in C++ use the syntax I provided. The syntax in C# is slightly different.

--Rob

Answer 6

It is my mistake. In C# it should be:

timer.Tick += DispatcherTimer_Tick;

timer->Tick += ref new Windows::Foundation::EventHandler<Object^>(this, &Application1::DispatcherTimer_Tick);

But in C++ below it is an error (without ref new).

timer->Tick += DispatcherTimer_Tick;

---

Charlie Chang L

Answer 7

C# and C++ are different languages. You cannot use C# syntax in a C++ app.

--Rob