1 #ifndef _DLL_H_ 2 #define _DLL_H_ 3  4 #if BUILDING_DLL 5 #define DLLIMPORT __declspec(dllexport) 6 #else 7 #define DLLIMPORT __declspec(dllimport) 8 #endif 9 10 DLLIMPORT int add(int i,int j);11 12 #endif

 1 /* Replace "dll.h" with the name of your header */ 2 #include "dll.h" 3 #include <windows.h> 4  5 DLLIMPORT int add(int i, int j) 6 { 7     return i+j; 8 } 9 10 BOOL WINAPI DllMain(HINSTANCE hinstDLL,DWORD fdwReason,LPVOID lpvReserved)11 {12     switch(fdwReason)13     {14         case DLL_PROCESS_ATTACH:15         {16             break;17         }18         case DLL_PROCESS_DETACH:19         {20             break;21         }22         case DLL_THREAD_ATTACH:23         {24             break;25         }26         case DLL_THREAD_DETACH:27         {28             break;29         }30     }31     32     /* Return TRUE on success, FALSE on failure */33     return TRUE;34 }

 1 #include <windows.h> 2 #include <stdio.h> 3   4 typedef int (*Fun)(int,int);     //这里声明一个函数指针，typedef 关键字是必须的，好像要显示调用dll中的函数，都需要这样用函数指针给出声明 5   6 int main() 7 { 8     HINSTANCE hDll; 9     Fun Add;10     hDll=LoadLibrary("myDll.dll");11     if (hDll==NULL)12     {13         printf("%s","failed to load dll!\n");14     }15     else16     {17         printf("%s","succeeded in loading dll\n");18         Add=(Fun)GetProcAddress(hDll,"add");19         if (Add!=NULL)20         {21             int i,j;22             printf("%s","input the first number:");23             scanf("%d",&i);24             printf("%s","input the first number:");25             scanf("%d",&j);26             printf("sum = %d\n",Add(i,j));27         }28     }29     FreeLibrary(hDll);30     31     system("pause");32     return 0;33 }