C# Delegates in vc++

[Anu_Bala]

Hi, Im using C# in VC++ for WPF. I create one Delegates in C# as follow

public delegate void NameTab(string msg);
public static event NameTab CallClick;

private void Callbutton_Click(object sender, RoutedEventArgs e)
{
String msg = comboBox1.Text;
CallClick(msg);
}

Im using in my VC++ code as follow

Tabcontrol::SecondTab::CallClick += gcnew Tabcontrol::SecondTab::NameTab(OnCallClick);

And OnCallClick fucntion is

static void OnCallClick(CString msg)
{
}

But it shows error error C3352: 'OnCallClick' : the specified function does not match the delegate type 'void (System::String ^)' Im using button click event handler and its woking perfectly.But this only shows error.As i want to get the text in combox,im passing that text as parametes and im uisng that text in vc++ code. pls help me.

Anu

[teejayem]

that is because your callback needs to accept a System.String datatype instead of CString. If you need to marshal String^ to Cstring just do the following.

static void OnCallClick(String ^msg)
{
CString nativeString = msg;
}

And guess what! You may have noticed that you don't have to marshal System.String into a CString in your code. That is because of a little trick in cstringt.h

#if defined(__cplusplus_cli)

template <class SystemString>
CStringT( SystemString^ pString ) :
	CThisSimpleString( StringTraits::GetDefaultManager() )
{
	cli::pin\_ptr<const System::Char> pChar = PtrToStringChars( pString );
	const wchar\_t \*psz = pChar;
	\*this = psz;
}

this function handles the marshaling for you :)

Don't be overcome by evil, but overcome evil with good