Fire events and event handlers : Event « Delegate « Visual C++ .NET

1. Visual C++ .NET
2. Delegate
3. Event

Fire events and event handlers

 
#include "stdafx.h"
using namespace System;
using namespace System::Threading;

ref class MyEventArgs : EventArgs
{
   public:
     property String^ Info;

     MyEventArgs(String^ info)
     {
        Info = info;
     }
};

delegate void MyEventHandler(Object^ sender, MyEventArgs^ args);


ref class Events
{
   public:
      event EventHandler^ Start;

      event EventHandler^ Exit;

      void RaiseStartEvent()
      {
          Start(this, gcnew EventArgs());
      }

      void RaiseExitEvent()
      {
          Exit(this, gcnew EventArgs());
      }

      void OnStart(Object^ sender, EventArgs^ args)
      {
         Console::WriteLine("Starting");
      }

      void OnExit(Object^ sender, EventArgs^ args)
      {
          Console::WriteLine("Exiting");
      }
};

void f(Events^ e)
{
   e->RaiseStartEvent();

   Console::WriteLine("Doing something.");

   e->RaiseExitEvent();
}

int main()
{

    Events^ events = gcnew Events();

    // add the event handlers for Start and Exit
    events->Start += gcnew EventHandler(events, &Events::OnStart);
    events->Exit += gcnew EventHandler(events, &Events::OnExit);

    f(events);

    // remove the event handlers
    events->Start -= gcnew EventHandler(events, &Events::OnStart);
    events->Exit -= gcnew EventHandler(events, &Events::OnExit);
}

   
  

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