Delegate Callback with parameter

Hi,

We try callback C# method from C++ DLL using delegate, using delegate
without argument works fine for me however the
CallBackFunctionWithParameter 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.Collections;
using System.ComponentModel;
using System.Windows.Forms;
using System.Data;
using System.Runtime.InteropServices;

namespace FunctionCallbacks
{
public class Form1 : System.Windows.Forms.Form
{
delegate void delegateMethod ();
delegate void delegateMethodWithParameter(int i);
private System.Windows.Forms.Button button1;

/// <summary>
/// Required designer variable.
/// </summary>
private System.ComponentModel.Container components = null;

[DllImport("..\\..\\..\\C++\\Debug\\C++.dll")]
private static extern void CallBackFunction (delegateMethod method);

[DllImport("..\\..\\..\\C++\\Debug\\C++.dll")]
private static extern void CallBackFunctionWithParameter
(delegateMethodWithParameter method);


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

/// <summary>
/// Clean up any resources being used.
/// </summary>
protected override void Dispose( bool disposing )
{
if( disposing )
{
if (components != null)
{
components.Dispose();
}
}
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 InitializeComponent()
{
this.button1 = new System.Windows.Forms.Button();
this.SuspendLayout();
//
// button1
//
this.button1.Location = new System.Drawing.Point(88, 120);
this.button1.Name = "button1";
this.button1.TabIndex = 0;
this.button1.Text = "button1";
this.button1.Click += new System.EventHandler(this.button1_Click);
//
// Form1
//
this.AutoScaleBaseSize = new System.Drawing.Size(5, 13);
this.ClientSize = new System.Drawing.Size(292, 266);
this.Controls.Add(this.button1);
this.Name = "Form1";
this.Text = "Form1";
this.Load += new System.EventHandler(this.Form1_Load);
this.ResumeLayout(false);

}
#endregion

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

private void Form1_Load(object sender, System.EventArgs e)
{
}

private void button1_Click(object sender, System.EventArgs e)
{
delegateMethod d = new delegateMethod(PrintMessage);
delegateMethodWithParameter f = new
delegateMethodWithParameter(PrintMessageWithParameter);
CallBackFunction (d); //in C++ dll
CallBackFunctionWithParameter(f); //in C++ dll
}


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

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





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

In Win32 DLL
=======================================================================.
..
..
//takes a function pointer as an argument
extern "C" __declspec(dllexport) void CallBackFunction
(void(*callFunction()))
{
callFunction (); //call 'PrintMessage()' method in C#
}


//takes a function pointer as an argument
extern "C" __declspec(dllexport) void CallBackFunctionWithParameter
(void (*callFunctionWithParameter) (int i))
{
callFunctionWithParameter(111); // call 'PrintMessage()' method
// in C#
}
..
..
..