How to add function in C++, Visual Studio Community 2022

Renjie Zhang 40

How to add function in C++, Visual Studio Community 2022.

System: Windows 11 Home

Viorel 117.2K Reputation points

2024-03-17T10:25:09.12+00:00
Did you already create a new C++ project (“Console App”)?

https://learn.microsoft.com/en-us/cpp/build/vscpp-step-1-create

The function can be defined before the main function.

2 answers

Minxin Yu 11,586 Reputation points Microsoft Vendor

2024-03-18T03:01:46.5866667+00:00
Hi, @Renjie Zhang

Functions (C++)

Provide a function declaration in the header(.h) file and provide a definition of the function in the associated .cpp file.

declaration :

//Sum.h int sum(int a, int b);

definition :

//Sum.cpp #include"Sum.h" int sum(int a, int b) { return a + b; }

Use the function in ConsoleApplication.cpp

#include<iostream> #include"Sum.h"// include the header file int main() { int i = sum(10, 32); int j = sum(i, 66); std::cout << "The value of j is" << j << std::endl; // 108 }

Best regards,

Minxin Yu

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Minxin Yu 11,586 Reputation points Microsoft Vendor

2024-03-20T01:34:29.3666667+00:00

Hi, @Renjie Zhang

May I know if you have got any chance to check my answer?

Renjie Zhang 40 Reputation points

2024-03-21T03:59:00.9133333+00:00

In Windows, adding functions in MFC cann't be directly copied from the method used in VC++. In general, how to add functions in Window?

Minxin Yu 11,586 Reputation points Microsoft Vendor

2024-03-21T04:09:36.8433333+00:00

I do not quite understand what you mean. There is no difference using functions between MFC and Win32 C++. Can you provide an example?

Renjie Zhang 40 Reputation points

2024-03-21T09:57:02.6466667+00:00

Hi, Minxin,

The example you provided is for adding a method in the console, not in Windows.

In the console, we only need to define the function type and add variables; in the window, we also need to add resources. The system we applied is VS C++, not VC++.

The below case is for console, not for Windows.

So would you kindly let me know how to add functions in Windows, C++, Visual Studio Community 2022?

Regards,

Renjie

Minxin Yu 11,586 Reputation points Microsoft Vendor

2024-03-21T10:11:00.29+00:00

For example:
MFC application type: dialog based.

#pragma once //Sum.h int sum(int a, int b);

//Sum.cpp

#include"Sum.h" #include"pch.h"// if pch is enabled int sum(int a, int b) { return a + b; }

Drag one button from toolbar to designer and double click it to add click event.

Then add #include"Sum.h" in MFCDialogApplication1.h.

and #include<string> MFCDialogApplication1.h. //Todo: Convert int to string
in MFCDialogApplication1.cpp

void CMFCApplication1Dlg::OnBnClickedButton1() { // TODO: Add your control notification handler code here int i = sum(10, 32); MessageBoxA(this->GetSafeHwnd(), std::to_string(i).c_str(), "", NULL); }

Renjie Zhang 40 Reputation points

2024-03-24T08:02:19.8933333+00:00

Dear Minxin,

Thank you for your response.

This is a screenshot of a windows program in VC++ (Appendix 1)， similar to your example. I am not familiar with the way to add functions in Visual Studio, so I would like to inquire about it. What I need is a custom function in VS.C++ under the Windows environment.

Regards,

Renjie

A windows program in VC++ (Appendix 1):

ON_COMMAND(ID_FILE_OPEN, &CCGuGisProjectionView::OnFileOpen)

//CGuGisprojectView.h

public:

afx_msg void OnFileOpen();

// 属性

bool m_bLButtonDown,   m_bDraw;

char //a



      // D

      m_cDaseName[1024],

      // F

//      m_cFileHead[_FILEHEAD],// 文件头 2019.06.25

      m_cFileHead[_FILEHEAD_2048],// 文件头 2019.06.25

      m_cFilePathNameImgDbf[_FILEHEAD],

      m_cFirstInitBitmapImage,

      m_cFirst,    // m_cShapeType,

      * m_pcFilePathName,

      * m_pcFilePathNameT,

      // I

      m_cInitBitmap,

      m_cInitBitImage,m_cInitBitImage_2,m_cInitBitmapImage,m_cDraw,

      m_cInstantComputingCoefficient,

public:

afx_msg void OnFileOpen();

// 属性

bool m_bLButtonDown,   m_bDraw;

char //a



      // D

      m_cDaseName[1024],

      // F

//      m_cFileHead[_FILEHEAD],// 文件头 2019.06.25

      m_cFileHead[_FILEHEAD_2048],// 文件头 2019.06.25

      m_cFilePathNameImgDbf[_FILEHEAD],

      m_cFirstInitBitmapImage,

      m_cFirst,    // m_cShapeType,

      * m_pcFilePathName,

      * m_pcFilePathNameT,

      // I

      m_cInitBitmap,

      m_cInitBitImage,m_cInitBitImage_2,m_cInitBitmapImage,m_cDraw,

      m_cInstantComputingCoefficient,

Minxin Yu 11,586 Reputation points Microsoft Vendor

2024-03-25T01:54:16.9133333+00:00

Is OnFileOpen your custom function? Can you provide more description about your custom function. What is the declaration and definition of the function, and where do you intend to utilize it?

Renjie Zhang 40 Reputation points

2024-04-06T06:04:34.4266667+00:00

OnFileOpen is not my custom function, and it's a predefined function in VC++.

Recently I purchased a new computer, but there are some issues, so now I communicate with customer support. My plan is to create a custom function in Windows for computer graphics and compensating for the shortcomings of the laptops.

OnFileOpen is a predefined function in VC++. Recently I intend to create a custom function called GuFileOpen(). However, I don’t know how to draft VS. C++ in MFC, Windows.

For Void GuFileOpen(), I am not sure what symbol to add in front of the function to modify it, scheduled to add from menu.

Minxin Yu 11,586 Reputation points Microsoft Vendor

2024-04-08T02:50:08.0066667+00:00

It is void GuFileOpen();
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Renjie Zhang 40 Reputation points

2024-03-21T09:59:06.74+00:00

Dear Minxin，

The example you provided is for adding a method in the console, not in Windows.

In the console, we only need to define the function type and add variables; in the window, we also need to add resources. The system we applied is VS C++, not VC++.

The below case is for console, not for Windows.

So would you kindly let me know how to add functions in Windows, C++, Visual Studio Community 2022?

Regards,

Renjie
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