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🦑HOW TO CREATE .DLL FILES ?
DLL files are dynamic-linked library files written and controlled with .DLLs make sharing, storing, and saving your code simple.we will show you how to create a DLL file with Visual Studio, the Windows application, or Visual Studio for Mac. Make sure you have “Desktop Development with C++” checked when you install. If you already have Visual Studio but didn’t check that box, you can run the installer again to make sure you do.
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🦑🅻🅴🆃 🆂 🆂🆃🅰️🆁🆃:

1) Open Visual Studio. You can find this in your Start Menu or Applications folder. Since a DLL is a library of information, it is only one piece of a project, and usually requires an accompanying app to access it.

> You can get Visual Studio for Windows here: https://docs.microsoft.com/en-us/visualstudio/install/install-visual-studio?view=vs-2019

> Visual Studio for Mac can be downloaded here: https://docs.microsoft.com/en-us/visualstudio/mac/installation?view=vsmac-2019

2) Click New and Project. The “Create a New Project” dialog box will pop up.

3)
Set the options for Language, Platform, and Project Type. These will filter what kinds of project templates appear.

> Click Language to get a drop-down menu and click C++.

4) Click Platform to get a drop-down menu and click Windows.

5) Click Dynamic-link Library (DLL). Your choice will highlight blue. Click Next to continue.

6) Type a name in the Name Box for the project. For example, type “MathLibrary” in the box for a sample name.

7) Click Create. The DLL project is created.

8)
Add a header file to the DLL. You can do this by clicking “Add New Item” from “Project” in the menu bar.

> Select Visual C++ from the left menu of the dialog box.

> Select Header file (.h) from the center of the dialog box.

> Type the name as “MathLibrary.h” in the name field below the menu choices.

> Click Add to generate the blank header file.

9) Type the following code into the blank header file:

// MathLibrary.h - Contains declarations of math functions
#pragma once

#ifdef MATHLIBRARY_EXPORTS
#define MATHLIBRARY_API __declspec(dllexport)
#else
#define MATHLIBRARY_API __declspec(dllimport)
#endif

// The Fibonacci recurrence relation describes a sequence F
// where F(n) is { n = 0, a
// { n = 1, b
// { n > 1, F(n-2) + F(n-1)
// for some initial integral values a and b.
// If the sequence is initialized F(0) = 1, F(1) = 1,
// then this relation produces the well-known Fibonacci
// sequence: 1, 1, 2, 3, 5, 8, 13, 21, 34, ...

// Initialize a Fibonacci relation sequence
// such that F(0) = a, F(1) = b.
// This function must be called before any other function.
extern "C" MATHLIBRARY_API void fibonacci_init(
const unsigned long long a, const unsigned long long b);

// Produce the next value in the sequence.
// Returns true on success and updates current value and index;
// false on overflow, leaves current value and index unchanged.
extern "C" MATHLIBRARY_API bool fibonacci_next();

// Get the current value in the sequence.
extern "C" MATHLIBRARY_API unsigned long long fibonacci_current();

// Get the position of the current value in the sequence.
extern "C" MATHLIBRARY_API unsigned fibonacci_index();

12) Add a CPP file to the DLL. You can do this by clicking Add New Item from “Project” in the menu bar.

> Select “Visual C++” from the left menu of the dialog box.

> Select “C++ File (.cpp)” from the center of the dialog box.

> Type the name as “MathLibrary.cpp” in the name field below the menu choices.

> Click Add to generate the blank file.

+ ADd ANY EXtra code for fonctional you need

13) Click Build in the menu bar. You’ll find this either above the project space (Windows) or along the top of your screen (Macs).

@ ̵͑Steave(tm)
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