Arijeet Ghosh

Arijeet Ghosh

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Made a function in C but how to...?

Jul 3 2020 10:49 PM
he examples given by Sir....if I change a little bit then the program runs OK.
But I don't know how to store the result in C#. Please assist.......
So I mention the code here:-
VC++ Code:-
In Ctest1.h
#include<stdio.h>
#include "pch.h"
#pragma once
class __declspec(dllexport) Ctest1
{
public:
Ctest1();
~Ctest1();
char* func();
};
In Ctest1.cpp
#include "pch.h"
#include "Ctest1.h"
char* Ctest1::func()
{
char sname[] = { "kkk" };
return sname;
}
Ctest1::Ctest1()
{}
Ctest1::~Ctest1()
{}
In Caller.h
#include "Ctest1.h"
#include "pch.h"
#ifdef __cplusplus
extern "C"
{
#endif
extern __declspec(dllexport) Ctest1* _Create();
extern __declspec(dllexport)void dispose(Ctest1* _pObject);
extern __declspec(dllexport)char* func(Ctest1* _pObject);
#ifdef __cplusplus
}
#endif
In Caller.cpp:-
#include "pch.h"
#include "Caller.h"
Ctest1* _Create()
{
//Ctest1 c = new Ctest1();
return new Ctest1();
}
void dispose(Ctest1* _pObject)
{
if (_pObject != NULL)
{
delete _pObject;
_pObject = NULL;
}
}
char* func(Ctest1* _pObject)
{
if (_pObject != NULL)
{
char* str = _pObject->func();
return str;
}
}
And in C# Code:-
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Runtime.InteropServices;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;
namespace WindowsFormsApp1
{
public partial class Form1 : Form
{
[DllImport("First.dll", CallingConvention = CallingConvention.Cdecl)]
public static extern IntPtr _Create();
[DllImport("First.dll", CallingConvention = CallingConvention.Cdecl)]
public static extern void dispose(IntPtr pCtest1);
[DllImport("First.dll", CallingConvention = CallingConvention.Cdecl)]
public static extern IntPtr func(IntPtr pTest);
public Form1()
{
InitializeComponent();
}
private void button1_Click(object sender, EventArgs e)
{
IntPtr ptestClass = _Create();
IntPtr p= func(ptestClass);
/// Now how to get the string in C-funcion
dispose(ptestClass);
}
}
}
So sir how to get the string returned from C++ and store it in C#

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Answers (2)