调用不同dll中的同一函数

就是使用LoadLibrary取得相应的dll句柄，然后使用GetProcAddress取得相应函数接口的入口地址，

通过函数指针调用就行了。可以使用Dependency Walk 工具查看dll中有哪些接口。

我和我的组长各写了一个，高下立断。

主要我没有判断NULL值，需要注意。

我的代码：

 1 class DX8Interface

 2 {

 3     typedef HRESULT (WINAPI * DX8_D3DXCreateSprite)(LPDIRECT3DDEVICE8, LPD3DXSPRITE *);

 4 public:

 5     static HRESULT WINAPI D3DXCreateSprite(LPDIRECT3DDEVICE8 pDevice, LPD3DXSPRITE* ppSprite);

 6     static bool Initial();

 7     static bool Free();

 8 private:

 9     static HMODULE            m_hDX8Module;

10     static DX8_D3DXCreateSprite m_pfD3DXCreateSprite;

11 };

12 DX8Interface::DX8_D3DXCreateSprite DX8Interface::m_pfD3DXCreateSprite = NULL;

13 HMODULE DX8Interface::m_hDX8Module = NULL;

14 HRESULT WINAPI DX8Interface::D3DXCreateSprite(LPDIRECT3DDEVICE8 pDevice, LPD3DXSPRITE* ppSprite)

15 {

16     if(NULL == m_pfD3DXCreateSprite) Initial();

17     return m_pfD3DXCreateSprite(pDevice, ppSprite);

18 }

19 bool DX8Interface::Initial()

20 {

21     m_hDX8Module = ::LoadLibrary(_T("D3DX8ab.dll"));

22     m_pfD3DXCreateSprite = (DX8_D3DXCreateSprite)GetProcAddress(m_hDX8Module, "D3DXCreateSprite");

23 

24     return true;

25 }

26 bool DX8Interface::Free()

27 {

28     return ::FreeLibrary(m_hDX8Module);

29 }

leader代码：

 1 class DX9Interface

 2 {

 3     typedef HRESULT (WINAPI *D3DXCreateSpriteFun)(LPDIRECT3DDEVICE9, LPD3DXSPRITE*);

 4 public:

 5     static bool Initial()

 6     {

 7         m_hModule = LoadLibrary(_T("D3dx9_42.dll"));

 8         if(m_hModule == NULL)

 9         {

10             TRACEE(_T("Load D3dx9_42.dll failed."));

11             return false;

12         }

13 

14         m_pD3DXCreateSprite = (D3DXCreateSpriteFun)GetProcAddress(m_hModule, "D3DXCreateSprite");

15         if(m_pD3DXCreateSprite == NULL)

16         {

17             TRACEE(_T("Get D3DXCreateSpriteFun for D3dx9_42.dll failed."));

18             return false;

19         }

20 

21         return true;

22     }

23 

24     static void Destory()

25     {

26         m_pD3DXCreateSprite = NULL;

27 

28         if(m_hModule)

29         {

30             FreeLibrary(m_hModule);

31             m_hModule = NULL;

32         }

33     }

34 

35     static HRESULT D3DXCreateSprite(LPDIRECT3DDEVICE9 pDevice, LPD3DXSPRITE* ppSprite)

36     {

37         if(m_pD3DXCreateSprite == NULL)

38         {

39             if(!Initial())

40             {

41                 return S_FALSE;

42             }

43         }

44         return m_pD3DXCreateSprite(pDevice, ppSprite);

45     }

46 private:

47     static HMODULE m_hModule;

48     static D3DXCreateSpriteFun m_pD3DXCreateSprite;

49 };