Creation and invocation of dynamic link libraries in C + +

Steps to create a dynamic connection library:

First, create NON-MFC DLL dynamic link library

1, open file-> new-> project option, select Win32 dynamic-link library->sample Project

-> Project Name: Dlldemo

2, a new one. h file DllDemo.h

#ifdef Dlldemo_exports

#define DLLAPI __declspec (dllexport)

#else

#define DLLAPI __declspec (dllimport)

extern "C"//compiled as is

{

Dllapi int __stdcall Max (int a,int b); __stdcall enables the ability to invoke APIs within non-C + + languages

}

#endif

3, import DllDemo.h file in DllDemo.cpp file, and implement Max (Int,int) function

#include "DllDemo.h"

Dllapi int __stdcall Max (int a,int b)

{

if (a==b)

return NULL;

else if (a>b)

return A;

Else

return b;

}

4, compile the program to generate dynamic connection library

Create a dynamic connection library DllDemo.dll with a. def file.

1, delete the Dlldemo project in the DllDemo.h file.

2, in the DllDemo.cpp file header, delete #include DllDemo.h statement.

3. Add a text file to the project, name it dlldemo.def and write the following statement:

LIBRARY Mydll

Exports

max@1

4, compile the program to generate dynamic Connection library.