how to use c++/cli dll in windows form applicaton (present in CLR under VC++ template)

Question

5.00/5 (1 vote)

See more:

Dear all,
i tried to create a dll (with using c++/cli)and for this i did -
choose VC++ template ->CLR-> and choose Class Library for making a simple dll with a method sum. code is look like:- Header file code is:-

C++

// dll_for_sum.h

#pragma once

using namespace System;

namespace dll_for_sum {

	public ref class Class1
	{
		// TODO: Add your methods for this class here.
	public:
		int sum( int x, int y );
	
	};
}

.cpp code is :-

C++

// This is the main DLL file.

#include "stdafx.h"

#include "dll_for_sum.h"

int dll_for_sum::Class1::sum(int x, int y)
{
	return x+y;
}

when i build it , it successfully build, here i get one dll_for_sum.dll in debug folder. now i want to use it in -visual studio -> new->choose and expand visual c++ template ->choose CLR -> *Window form application*
i want to call sum function on a button_click event.

 Could any body tell me what files ( only .dll or .dll + dll_for_sum.h ) i need to paste in window application route folder to call sum function??????????

when i wondered i found - CLR->CLass Library is of type c++/cli managed code so we only need .dll file to call it, here i set the ref of .dll in window application by using following step:-

 For references i go ->Properties ->references->framework & references ->add new references ->then browse and choose .dll file.

after this on_button_click area I WROTE:-

C++

private: System::Void button1_Click(System::Object^  sender, System::EventArgs^  e) {
                Class1 obj;
                obj.sum(2,3);
            }
   };

or
Perhaps object is created by differently in c++/CLI so i wrote:-

C++

Class1^ objectt = gcnew Class1();
				 
objectt->sum(10,12);

here in both cases i got the error like :-
1>c:\documents and settings\administrator\my documents\visual studio 2010\projects\call_sum_method\call_sum_method\Form1.h(81): error C2065: 'Class1' : undeclared identifier
1>c:\documents and settings\administrator\my documents\visual studio 2010\projects\call_sum_method\call_sum_method\Form1.h(81): error C2065: 'objectt' : undeclared identifier
1>c:\documents and settings\administrator\my documents\visual studio 2010\projects\call_sum_method\call_sum_method\Form1.h(81): error C2061: syntax error : identifier 'Class1'
1>c:\documents and settings\administrator\my documents\visual studio 2010\projects\call_sum_method\call_sum_method\Form1.h(82): error C2065: 'objectt' : undeclared identifier
1>c:\documents and settings\administrator\my documents\visual studio 2010\projects\call_sum_method\call_sum_method\Form1.h(82): error C2227: left of '->sum' must point to class/struct/union/generic type

Give me some way to come out with this problem

Posted 10-Oct-12 19:18pm

amit _pathak_aadi

Add a Solution

1 solution

Add a Solution

Add your solution here

Treat my content as plain text, not as HTML

Preview 0

…

Existing Members

Sign in to your account

...or Join us

Download, Vote, Comment, Publish.

Your Email
Password
Forgot your password?

Your Email
This email is in use. Do you need your password?
Optional Password

I have read and agree to the Terms of Service and Privacy Policy
Please subscribe me to the CodeProject newsletters

When answering a question please:

Read the question carefully.
Understand that English isn't everyone's first language so be lenient of bad spelling and grammar.
If a question is poorly phrased then either ask for clarification, ignore it, or edit the question and fix the problem. Insults are not welcome.
Don't tell someone to read the manual. Chances are they have and don't get it. Provide an answer or move on to the next question.

Let's work to help developers, not make them feel stupid.

This content, along with any associated source code and files, is licensed under The Code Project Open License (CPOL)

amit _pathak_aadi · Accepted Answer · 2012-10-11T02:13:00

Finally i get the solution. Hurray!!!!
I Asked

Could any body tell me what files ( only .dll or .dll + dll_for_sum.h ) i need to paste in window application route folder to call sum function??????????

My ans-
only .dll file require here, and what u need to do is to reference it in the project by following way:-

 Step -1 :- For references i go ->Properties ->references->framework & references ->add new references ->then browse and choose .dll file.

Step-2 go solution explorer -> header file -> stdafx.h and the write

VB

// TODO: reference additional headers your program requires here

using namespace dll_for_sum;

step -3
on a button click write following to call sum function:-

C++

private: System::Void button1_Click(System::Object^  sender, System::EventArgs^  e) {
                                  
Class1 obj;				
 int sum = obj.sum(100,300);				
 String ^s = Convert::ToString(sum);			
label1->Text = s;
}

or you can also write this;-

C++

private: System::Void button1_Click(System::Object^  sender, System::EventArgs^  e) {
                                
Class1 ^ obj = gcnew Class1; 				
int sum = obj->sum(10,10);				
String ^s = Convert::ToString(sum);				
label1->Text = s;
}