dll动态链接库使用过程

      // 1.加载动态链接库      g_hDll = ::LoadLibrary("piano_dll.dll");      if(g_hDll){        // 2.得到各函数的地址        g_pCreateFun = (TYPEFUNCREATE)::GetProcAddress(g_hDll, "fun_Create");        g_pPlayFun   = (TYPEFUNPLAY)::GetProcAddress(g_hDll, "fun_playOneSound");        g_pReleaseFun = (TYPEFUNCREATE)::GetProcAddress(g_hDll, "fun_Release");        // 3.调用        g_pCreateFun(hWnd);      }