How to call function from cpp file in winform?

Question

Windows Forms

Hello.
I am new to Winforms, only worked with C++ in console.

In the MyForm.cpp file, a function is declared - int check() , how can I call it in the form and write return to some variable?
Visual Studio 2017 development environment

Code in MyForm.cpp :

#include "MyForm.h"
#include "MyForm1.h"
#include <iostream>
#include <Windows.h>
#include <string>
#include <stdlib.h>
#include <conio.h>
#include <tchar.h>

using namespace System;
using namespace System::Windows::Forms;

DWORD pid;

[STAThread]
int main(array<String^>^ arg){
  Application::EnableVisualStyles();
  Application::SetCompatibleTextRenderingDefault(false);
  Project1::MyForm form; //WinFormsTest - имя вашего проекта
  Application::Run(%form);
}

int reply = 0;

int check(){
  HWND hWnd = FindWindowA(0, ("notepad"));
  GetWindowThreadProcessId(hWnd, &pid);
  if(hWnd){
    reply = 1;
    return reply;
  }else{
    reply = 2;
    return reply;
  }
}

Answer 1

1. Right click on project -- > Properties --> Configuration Properties --> Linker --> Input
2. Select the 'Additional Dependencies" property node and then Click the on the 3 dotted (...) button
3. Then on the 'Additional Dependencies' popup, input "user32.lib" on the top textbox and click on 'Ok' button
4. Click on 'Apply' button and re-compile your application. .............. the linker errors are gone!