Windows writes dynamic-link library DLLs

1. In the VC new Win32 Console project, the project calls the dynamic link library My.dll in the function add, implementation of the addition, the code is as follows

#include <stdio.h> #include <windows.h>typedef int (*lpaddfun) (int, int);//macro defines function pointer type int main (int argc, Char *argv[]) {    hinstance hdll;//dll handle    lpaddfun addfun;//function pointer    hdll = LoadLibrary ("My.dll");//Load Library    if (hdll ! = NULL)    {        Addfun = (lpaddfun) GetProcAddress (hDLL, "add");//Get the Add function pointer        if (addfun! = NULL)        {            int result = Addfun (2, 3);            printf ("%d\n", result);        }        FreeLibrary (hDLL);    }    return 0;}

2. Create a new dynamic link library in VC My, which has an addition function add, the code is as follows

extern "C" __declspec (dllexport) int add (int, int);//export library function addint Add (int a, int b) {return a + B;}

This DLL can be called by putting the compiled DLL of the project into the same directory as the console project in 1.

Windows writes dynamic-link library DLLs