Make Turbo C DLL to use in C# windows application

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In some cases of our professional life we need to parse or decode or handle large number of file. As you knew that for IO purpose turbo C is faster than other technologies like dot net or something else. In my cases i need to develop an ASN decoder where i need to decode more than million of files. In such cases i need to develop a ASN decoder. In my cases i have done the following way:

1. Create a Turbo C program which will decode ASN files.
2. Convert the Turbo C program to a DLL to use in C# windows application.
3. After that upload data into the SQL Server/Oracle database.

Here in this article i will explain only how one can create a DLL file created in Turbo C and then use this DLL file in C# windows application. Steps were given below:



1. Create a Turbo C program Like below:

#include<stdio.h>
#include<conio.h>

int ADDs(int num1,int num2)
{
 return num1+num2;
}

int Subtract(int num1,int num2)
{
  return num1-num2;
}

void main()
{
 //printf("%d",ADDs(10,10));
}

2. Now open Visual Studio 2005.
3. Go to File--> New --> Project.
4. Now configure Language= VC++ and from templates select Win32 Project like below:



5. Now type the name of the DLL and then click on OK.
6. Now click on Next.
7. Select Application Type=DLL like below:



8. Now click Finish.
9. Now write the two function ADDs and Subtract in the following way:



10. Now your VC++ code window will like below:

#include "stdafx.h"


#ifdef _MANAGED
#pragma managed(push, off)
#endif

BOOL APIENTRY DllMain( HMODULE hModule,
                       DWORD  ul_reason_for_call,
                       LPVOID lpReserved
      )
{
    return TRUE;
}


int ADDs(int num1,int num2)
{
 return num1+num2;
}

int Subtract(int num1,int num2)
{
  return num1-num2;
}


#ifdef _MANAGED
#pragma managed(pop)
#endif

11. Now we need to create a definition file.
12. Now go to File-->New-->File. You will get below window:



13. Save the file as Export.def in the project root folder.
14. Now write the below content in Export.Def file:

LIBRARY "mymath"
EXPORTS
  ADDs
  Subtract

Or

Right cilck on mymath solution. Click Add-->New Item like below:



15. Now go to the Project--> Project Properties and define the Export.def file in the following way:



16. Now build your project.
17. Go to the debug folder and copy the mymath.dll file into your system32 folder.
18. Now create an C# windows application. Within the form Add two textboxes and one command button.
19. Now under button click event write below sample code:

private void button1_Click(object sender, EventArgs e)
        {
            int a=Adds(Convert.ToInt32(textBox1.Text), Convert.ToInt32(textBox2.Text));
            MessageBox.Show(a.ToString());
        }

20. Don't forget to import DLL as well as including using System.Runtime.InteropServices; So full code will be:

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Text;
using System.Windows.Forms;
using System.Runtime.InteropServices;

namespace WindowsApplication1
{
    public partial class Form1 : Form
    {
        [DllImport("mymath.dll")]
        public static extern int Adds(int Num1, int Num2);

        public Form1()
        {
            InitializeComponent();
        }

        private void button1_Click(object sender, EventArgs e)
        {
            int a=Adds(Convert.ToInt32(textBox1.Text), Convert.ToInt32(textBox2.Text));
            MessageBox.Show(a.ToString());
        }
    }
}

21. Now run the project. Hope you will get your desired output.