Delegate Callback with parameter

[Budi]

Hi,

We try callback C# method from C++ DLL using delegate, using delegate
without argument works fine for me however the
CallBackFunctio nWithParameter which call delegate with parameter crash
the application after being called .
Any suggestion will help and really appreaciated


Thanks

Budi


Here is the code :

In C#
=============== =============== =============== =============== ===========
using System;
using System.Drawing;
using System.Collecti ons;
using System.Componen tModel;
using System.Windows. Forms;
using System.Data;
using System.Runtime. InteropServices ;

namespace FunctionCallbac ks
{
public class Form1 : System.Windows. Forms.Form
{
delegate void delegateMethod ();
delegate void delegateMethodW ithParameter(in t i);
private System.Windows. Forms.Button button1;

/// <summary>
/// Required designer variable.
/// </summary>
private System.Componen tModel.Containe r components = null;

[DllImport("..\\ ..\\..\\C++\\De bug\\C++.dll")]
private static extern void CallBackFunctio n (delegateMethod method);

[DllImport("..\\ ..\\..\\C++\\De bug\\C++.dll")]
private static extern void CallBackFunctio nWithParameter
(delegateMethod WithParameter method);


public Form1()
{
//
// Required for Windows Form Designer support
//
InitializeCompo nent();
}

/// <summary>
/// Clean up any resources being used.
/// </summary>
protected override void Dispose( bool disposing )
{
if( disposing )
{
if (components != null)
{
components.Disp ose();
}
}
base.Dispose( disposing );
}

#region Windows Form Designer generated code
/// <summary>
/// Required method for Designer support - do not modify
/// the contents of this method with the code editor.
/// </summary>
private void InitializeCompo nent()
{
this.button1 = new System.Windows. Forms.Button();
this.SuspendLay out();
//
// button1
//
this.button1.Lo cation = new System.Drawing. Point(88, 120);
this.button1.Na me = "button1";
this.button1.Ta bIndex = 0;
this.button1.Te xt = "button1";
this.button1.Cl ick += new System.EventHan dler(this.butto n1_Click);
//
// Form1
//
this.AutoScaleB aseSize = new System.Drawing. Size(5, 13);
this.ClientSize = new System.Drawing. Size(292, 266);
this.Controls.A dd(this.button1 );
this.Name = "Form1";
this.Text = "Form1";
this.Load += new System.EventHan dler(this.Form1 _Load);
this.ResumeLayo ut(false);

}
#endregion

/// <summary>
/// The main entry point for the application.
/// </summary>
[STAThread]
static void Main()
{
Application.Run (new Form1());
}

private void Form1_Load(obje ct sender, System.EventArg s e)
{
}

private void button1_Click(o bject sender, System.EventArg s e)
{
delegateMethod d = new delegateMethod( PrintMessage);
delegateMethodW ithParameter f = new
delegateMethodW ithParameter(Pr intMessageWithP arameter);
CallBackFunctio n (d); //in C++ dll
CallBackFunctio nWithParameter( f); //in C++ dll
}


public void PrintMessage ( )
{
MessageBox.Show ("Hello");
}

public void PrintMessageWit hParameter(int i)
{
MessageBox.Show (i.ToString());
}
}
}





=============== =============== =============== =============== ===========

In Win32 DLL
=============== =============== =============== =============== ===========.
..
..
//takes a function pointer as an argument
extern "C" __declspec(dlle xport) void CallBackFunctio n
(void(*callFunc tion()))
{
callFunction (); //call 'PrintMessage() ' method in C#
}


//takes a function pointer as an argument
extern "C" __declspec(dlle xport) void CallBackFunctio nWithParameter
(void (*callFunctionW ithParameter) (int i))
{
callFunctionWit hParameter(111) ; // call 'PrintMessage() ' method
// in C#
}
..
..
..