3. Creating a Dynamic Link Library
3.1 DLL on VC++ Command-Line
file: libmath2.h
#ifndef __LIBMATHFUNC_H__
#define __LIBMATHFUNC_H__
__declspec(dllexport) int plus(int a, int b);
__declspec(dllexport) int minus(int a, int b);

file: libmath2.c
#include "libmath.h“
__declspec(dllexport) int plus(int a, int b)
        return (a+b);
__declspec(dllexport) int minus(int a, int b)
    return (a-b);
Note: “__declspec(dllexport)” modifiers enable the method to be exported by the DLL so that it can be    used by other applications.
Write and Compile the Implicit caller
suffix .dll
command cl
create cl /LD libmath2.c [–o libmath2.dll]
linking cl -o prog2.exe prog2.c libmath2.lib
– /LD: creates a DLL.
file: prog2.c
#include <stdio.h>
#include "libmath2.h"

int main()
printf("%d+%d=%d\n", 3, 2, plus(3, 2));
printf("%d+%d=%d\n", 3, 2, minus(3, 2));

return 0;
Write and Compile the explicit caller
linking cl -o prog3.exe prog3.c
#include <stdio.h>
#include <windows.h>

typedef int(*pPlus)(int, int);
typedef int(*pMinus)(int, int);

int main()
    HINSTANCE hInstance;
    pPlus plus;
    pMinus minus;


    plus = (pPlus)GetProcAddress(hInstance, "plus");
    minus = (pMinus)GetProcAddress(hInstance, "minus");

    printf("%d+%d=%d\n", 3, 2, plus(3, 2));
    printf("%d+%d=%d\n", 3, 2, minus(3, 2));

    return 0;
3.2 DLL in Visual Studio
Creating a new DLL project in Visual Studio
① From the File menu, select New and then Project….
② On the Project types pane, under Visual C++, select Win32.
③ On the Templates pane, select Win32 Console Application.
④ Choose a name for the project, such as libhello, and type it in the Name field. Choose a name for     the solution, such as DynamicLibrary, and type it in the Solution Name field.
⑤ Click OK to start the Win32 application wizard. On the Overview page of the Win32 Application     Wizard dialog box, click Next.
⑥ On the Application Settings page of the Win32 Application Wizard, under Application type, select     DLL if it is available or Console application if DLL is not available. Some versions of Visual Studio     do not support creating a DLL project by using wizards. You can change this later to make your     project compile into a DLL.
⑦ On the Application Settings page of the Win32 Application Wizard, under Additional options, select     Empty project.
⑧ Click Finish to create the project.
The implicit caller
– Link a library module.
The explicit caller
– Building without any setting.
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