Question

I’m trying to do it like I found in some example :

TimerID = gcnew System::Windows::Forms::Timer(); 
TimerID->Tick += gcnew System::EventHandler(this, &Bridge::timer1_Tick);

and

System::Void Bridge::timer1_Tick(System::Object^  sender, System::EventArgs^  e) 
{
    Bridge::DoUpdate();
}

But can’t create event handler because of error :

error C3364: ‘System::EventHandler’ : invalid argument for delegate
constructor; delegate target needs to be a pointer to a member
function

Bridge is unmanaged class.
So I’m declaring TimerID this way :

gcroot<System::Windows::Forms::Timer ^> TimerID;

What am I doing wrong here ? How to add Tick event proper ?

Answer 1

You didn’t post enough code to diagnose the error. This compiles:

public ref class Bridge : public System::Windows::Forms::Form
{
    Timer^ TimerID;
public:
    Bridge(void) {
        InitializeComponent();
        TimerID = gcnew System::Windows::Forms::Timer(); 
        TimerID->Tick += gcnew System::EventHandler(this, &Bridge::timer1_Tick);        
    }
private:
    void Bridge::timer1_Tick(System::Object^  sender, System::EventArgs^  e) {
    }
    void InitializeComponent(void) {
        // etc...
    }
};