用宏定义封装LoadLibrary，方便的动态加载dll

同学们动态加载dll的时候是不是感觉挺麻烦的，每次都::LoadLibrary，::GetProcAddress，还要typedef一堆函数。最近闲来无聊，用宏封装了一下，可以少写不少代码，用来也挺方便的。

不过最多支持5个参数，同学们可以自己加。等着下次用flexbison写一个生成工具，我感觉还是不错的。

 #pragma once
 /*! \brief 动态加载dll，并调用导出函数
 author:12178761@qq.com
 */
 #define DLLLOADER_BEGIN( NAME)\
 class DLLLOADER_##NAME\
 {\
 public:\
     static BOOL Init( LPCWSTR sDllPath){\
     if ( RefHModule())\
         {\
         return TRUE;\
         }\
         RefHModule() = ::LoadLibrary( sDllPath);\
         if ( !RefHModule())\
         {\
         return FALSE;\
         }\
         return TRUE;\
     }\
     static void UnInit(){\
     if ( RefHModule())\
         {\
         FreeLibrary( RefHModule());\
         RefHModule() = NULL;\
         }\
     }\
     static HMODULE& RefHModule(){\
     static HMODULE M = NULL;\
     return M;\
     }
 #define DLLLOADER_ENTRY_0( FUNNAME, FUNDESC, FUNRET, FUNRETDEF)\
     typedef FUNRET (FUNDESC *_##FUNNAME)();\
     static _##FUNNAME Ref##FUNNAME(){\
     _##FUNNAME F = (_##FUNNAME)::GetProcAddress( RefHModule(), #FUNNAME);\
     return F;\
     }\
     static FUNRET FUNNAME(){\
     if ( Ref##FUNNAME())\
         {\
         return Ref##FUNNAME()();\
         }\
         return FUNRETDEF;\
     }
 #define DLLLOADER_ENTRY_VOID0( FUNNAME, FUNDESC)\
     typedef void (FUNDESC *_##FUNNAME)();\
     static _##FUNNAME Ref##FUNNAME(){\
     _##FUNNAME F = (_##FUNNAME)::GetProcAddress( RefHModule(), #FUNNAME);\
     return F;\
     }\
     static void FUNNAME(){\
     if ( Ref##FUNNAME())\
         {\
         Ref##FUNNAME()();\
         }\
     }
 #define DLLLOADER_ENTRY_1( FUNNAME, FUNDESC, FUNRET, FUNRETDEF, PARAMTYPE1)\
     typedef FUNRET (FUNDESC *_##FUNNAME)(PARAMTYPE1);\
     static _##FUNNAME Ref##FUNNAME(){\
     _##FUNNAME F = (_##FUNNAME)::GetProcAddress( RefHModule(), #FUNNAME);\
     return F;\
     }\
     static FUNRET FUNNAME( PARAMTYPE1 PARAM1){\
     if ( Ref##FUNNAME())\
         {\
         return Ref##FUNNAME()( PARAM1);\
         }\
         return FUNRETDEF;\
     }
 #define DLLLOADER_ENTRY_VOID1( FUNNAME, FUNDESC, PARAMTYPE1)\
     typedef void (FUNDESC *_##FUNNAME)(PARAMTYPE1);\
     static _##FUNNAME Ref##FUNNAME(){\
     _##FUNNAME F = (_##FUNNAME)::GetProcAddress( RefHModule(), #FUNNAME);\
     return F;\
     }\
     static void FUNNAME( PARAMTYPE1 PARAM1){\
     if ( Ref##FUNNAME())\
         {\
         Ref##FUNNAME()( PARAM1);\
         }\
     }
 #define DLLLOADER_ENTRY_2( FUNNAME, FUNDESC, FUNRET, FUNRETDEF, PARAMTYPE1, PARAMTYPE2)\
     typedef FUNRET (FUNDESC *_##FUNNAME)(PARAMTYPE1, PARAMTYPE2);\
     static _##FUNNAME Ref##FUNNAME(){\
     _##FUNNAME F = (_##FUNNAME)::GetProcAddress( RefHModule(), #FUNNAME);\
     return F;\
     }\
     static FUNRET FUNNAME( PARAMTYPE1 PARAM1, PARAMTYPE2 PARAM2){\
     if ( Ref##FUNNAME())\
         {\
         return Ref##FUNNAME()( PARAM1, PARAM2);\
         }\
         return FUNRETDEF;\
     }
 #define DLLLOADER_ENTRY_VOID2( FUNNAME, FUNDESC, PARAMTYPE1, PARAMTYPE2)\
     typedef void (FUNDESC *_##FUNNAME)(PARAMTYPE1, PARAMTYPE2);\
     static _##FUNNAME Ref##FUNNAME(){\
     _##FUNNAME F = (_##FUNNAME)::GetProcAddress( RefHModule(), #FUNNAME);\
     return F;\
     }\
     static void FUNNAME( PARAMTYPE1 PARAM1, PARAMTYPE2 PARAM2){\
     if ( Ref##FUNNAME())\
         {\
         Ref##FUNNAME()( PARAM1, PARAM2);\
         }\
     }
 #define DLLLOADER_ENTRY_3( FUNNAME, FUNDESC, FUNRET, FUNRETDEF, PARAMTYPE1, PARAMTYPE2, PARAMTYPE3)\
     typedef FUNRET (FUNDESC *_##FUNNAME)(PARAMTYPE1, PARAMTYPE2, PARAMTYPE3);\
     static _##FUNNAME Ref##FUNNAME(){\
     _##FUNNAME F = (_##FUNNAME)::GetProcAddress( RefHModule(), #FUNNAME);\
     return F;\
     }\
     static FUNRET FUNNAME( PARAMTYPE1 PARAM1, PARAMTYPE2 PARAM2, PARAMTYPE3 PARAM3){\
     if ( Ref##FUNNAME())\
         {\
         return Ref##FUNNAME()( PARAM1, PARAM2, PARAM3);\
         }\
         return FUNRETDEF;\
     }
 #define DLLLOADER_ENTRY_VOID3( FUNNAME, FUNDESC, PARAMTYPE1, PARAMTYPE2, PARAMTYPE3)\
     typedef void (FUNDESC *_##FUNNAME)(PARAMTYPE1, PARAMTYPE2, PARAMTYPE3);\
     static _##FUNNAME Ref##FUNNAME(){\
     _##FUNNAME F = (_##FUNNAME)::GetProcAddress( RefHModule(), #FUNNAME);\
     return F;\
     }\
     static void FUNNAME( PARAMTYPE1 PARAM1, PARAMTYPE2 PARAM2, PARAMTYPE3 PARAM3){\
     if ( Ref##FUNNAME())\
         {\
         Ref##FUNNAME()( PARAM1, PARAM2, PARAM3);\
         }\
     }
 #define DLLLOADER_ENTRY_4( FUNNAME, FUNDESC, FUNRET, FUNRETDEF, PARAMTYPE1,\
 PARAMTYPE2, PARAMTYPE3, PARAMTYPE4)\
     typedef FUNRET (FUNDESC *_##FUNNAME)(PARAMTYPE1, PARAMTYPE2, PARAMTYPE3, PARAMTYPE4);\
     static _##FUNNAME Ref##FUNNAME(){\
     _##FUNNAME F = (_##FUNNAME)::GetProcAddress( RefHModule(), #FUNNAME);\
     return F;\
     }\
     static FUNRET FUNNAME( PARAMTYPE1 PARAM1, PARAMTYPE2 PARAM2, PARAMTYPE3 PARAM3, PARAMTYPE4 PARAM4){\
     if ( Ref##FUNNAME())\
         {\
         return Ref##FUNNAME()( PARAM1, PARAM2, PARAM3, PARAM4);\
         }\
         return FUNRETDEF;\
     }
 #define DLLLOADER_ENTRY_VOID4( FUNNAME, FUNDESC, PARAMTYPE1,\
 PARAMTYPE2, PARAMTYPE3, PARAMTYPE4)\
     typedef void (FUNDESC *_##FUNNAME)(PARAMTYPE1, PARAMTYPE2, PARAMTYPE3, PARAMTYPE4);\
     static _##FUNNAME Ref##FUNNAME(){\
     _##FUNNAME F = (_##FUNNAME)::GetProcAddress( RefHModule(), #FUNNAME);\
     return F;\
     }\
     static void FUNNAME( PARAMTYPE1 PARAM1, PARAMTYPE2 PARAM2, PARAMTYPE3 PARAM3, PARAMTYPE4 PARAM4){\
     if ( Ref##FUNNAME())\
         {\
         Ref##FUNNAME()( PARAM1, PARAM2, PARAM3, PARAM4);\
         }\
     }
 #define DLLLOADER_ENTRY_5( FUNNAME, FUNDESC, FUNRET, FUNRETDEF, PARAMTYPE1,\
     PARAMTYPE2, PARAMTYPE3, PARAMTYPE4, PARAMTYPE5)\
     typedef FUNRET (FUNDESC *_##FUNNAME)(PARAMTYPE1, \
     PARAMTYPE2, PARAMTYPE3, PARAMTYPE4, PARAMTYPE5);\
     static _##FUNNAME Ref##FUNNAME(){\
     _##FUNNAME F = (_##FUNNAME)::GetProcAddress( RefHModule(), #FUNNAME);\
     return F;\
     }\
     static FUNRET FUNNAME( PARAMTYPE1 PARAM1, PARAMTYPE2 PARAM2, \
     PARAMTYPE3 PARAM3, PARAMTYPE4 PARAM4, PARAMTYPE5 PARAM5){\
     if ( Ref##FUNNAME())\
         {\
         return Ref##FUNNAME()( PARAM1, PARAM2, PARAM3, PARAM4, PARAM5);\
         }\
         return FUNRETDEF;\
     }
 #define DLLLOADER_ENTRY_VOID5( FUNNAME, FUNDESC, PARAMTYPE1,\
     PARAMTYPE2, PARAMTYPE3, PARAMTYPE4, PARAMTYPE5)\
     typedef void (FUNDESC *_##FUNNAME)(PARAMTYPE1, \
     PARAMTYPE2, PARAMTYPE3, PARAMTYPE4, PARAMTYPE5);\
     static _##FUNNAME Ref##FUNNAME(){\
     _##FUNNAME F = (_##FUNNAME)::GetProcAddress( RefHModule(), #FUNNAME);\
     return F;\
     }\
     static void FUNNAME( PARAMTYPE1 PARAM1, PARAMTYPE2 PARAM2, \
     PARAMTYPE3 PARAM3, PARAMTYPE4 PARAM4, PARAMTYPE5 PARAM5){\
     if ( Ref##FUNNAME())\
         {\
         Ref##FUNNAME()( PARAM1, PARAM2, PARAM3, PARAM4, PARAM5);\
         }\
     }
 #define DLLLOADER_END()\
 };

 /*
 例子：
 DLLLOADER_BEGIN( SAMPLE)
 DLLLOADER_ENTRY_0( Function1, BOOL, FALSE, )
 DLLLOADER_ENTRY_VOID0( Function2, )
 DLLLOADER_ENTRY_1( Function3, BOOL, FALSE, , LPCWSTR)
 DLLLOADER_END()

 DLLLOADER_BEGIN(KERNEL32)
 DLLLOADER_ENTRY_1( LoadLibraryW, WINAPI, HMODULE, 0, LPCWSTR)
 DLLLOADER_ENTRY_3( GetModuleFileNameW, WINAPI, DWORD, 0, HMODULE, LPWSTR, DWORD)
 DLLLOADER_END()

 int _tmain(int argc, _TCHAR* argv[])
 {
     DLLLOADER_SAMPLE::Init( L"C:\\Users\\sosopop\\Documents\\Visual Studio 2005\\Projects\\testHandle\\debug\\testLoadDll.dll");
     DLLLOADER_SAMPLE::Function1();
     DLLLOADER_SAMPLE::Function2();
     DLLLOADER_SAMPLE::Function3(L"Function3 Hello");
     DLLLOADER_SAMPLE::Function4(L"Function4", L"Hello");
     DLLLOADER_SAMPLE::UnInit();

     DLLLOADER_KERNEL32::Init( L"c:\\windows\\system32\\kernel32.dll");
     HMODULE h =DLLLOADER_KERNEL32::LoadLibraryW( L"user32.dll");
     WCHAR sFileName[MAX_PATH]={0};
     DWORD nSize = DLLLOADER_KERNEL32::GetModuleFileNameW( NULL, sFileName, _countof(sFileName));

     return 0;
 }
 */