How to access API function of a Managed C++ application?

[Renato T. Forti]

Hi all,

How to access API function of a Managed C++ application?

Sample:

This doesn't work. (::MessageBox.)

----------------------------------------------------------------------------
------------------------

#pragma once

namespace teste

{

using namespace System;

using namespace System::Compone ntModel;

using namespace System::Collect ions;

using namespace System::Windows ::Forms;

using namespace System::Data;

using namespace System::Drawing ;

/// <summary>

/// Summary for Form1

///

/// WARNING: If you change the name of this class, you will need to
change the

/// 'Resource File Name' property for the managed resource
compiler tool

/// associated with all .resx files this class depends on.
Otherwise,

/// the designers will not be able to interact properly with
localized

/// resources associated with this form.

/// </summary>

public __gc class Form1 : public System::Windows ::Forms::Form

{

public:

Form1(void)

{

InitializeCompo nent();

}

protected:

void Dispose(Boolean disposing)

{

if (disposing && components)

{

components->Dispose();

}

__super::Dispos e(disposing);

}

private: System::Windows ::Forms::LinkLa bel * CallingAPI;

private:

/// <summary>

/// Required designer variable.

/// </summary>

System::Compone ntModel::Contai ner * components;

/// <summary>

/// Required method for Designer support - do not modify

/// the contents of this method with the code editor.

/// </summary>

void InitializeCompo nent(void)

{

this->CallingAPI = new
System::Windows ::Forms::LinkLa bel();

this->SuspendLayout( );

//

// CallingAPI

//

this->CallingAPI->Location = System::Drawing ::Point(96,
96);

this->CallingAPI->Name = S"CallingAPI ";

this->CallingAPI->TabIndex = 0;

this->CallingAPI->TabStop = true;

this->CallingAPI->Text = S"linkLabel1 ";

this->CallingAPI->LinkClicked += new
System::Windows ::Forms::LinkLa belLinkClickedE ventHandler(thi s,
CallingAPI_Link Clicked);

//

// Form1

//

this->AutoScaleBaseS ize = System::Drawing ::Size(5, 13);

this->ClientSize = System::Drawing ::Size(292, 266);

this->Controls->Add(this->CallingAPI);

this->Name = S"Form1";

this->Text = S"Form1";

this->ResumeLayout(f alse);

}

private: System::Void CallingAPI_Link Clicked(System: :Object * sender,
System::Windows ::Forms::LinkLa belLinkClickedE ventArgs * e)

{

::MessageBox(NU LL, "Call API MessageBox Function",
NULL, NULL); /*************** ********HERE*** *************** ****/

}

};

}

And COM+, How to access ? Any Idea?

--

:o)

[Bart Jacobs]

Renato,

Renato T. Forti wrote:

How to access API function of a Managed C++ application?
Remember to include the windows.h header file!

In form1.cpp, it reads:

#include "Form1.h"
#include <windows.h>

Change this to:

#include <windows.h>
#include "Form1.h"

Now it should work.
And COM+, How to access ? Any Idea?

COM+ components are known in .NET as serviced components. See

MSDN Library
-> Visual Studio .NET
-> .NET Framework
-> Programming with the .NET Framework
-> Writing Serviced Components

Bart Jacobs