How to use 'PluginApi.dll' from MFC?

Hi..
How to use 'PluginApi.dll' from MFC?

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HMODULE h;
h = LoadLibrary(_T("PluginApi.dll"));
typedef double (*aa)(void);
aa a;
a = (aa)GetProcAddress(h, "Get_RollOutput");

LoadLibrary 's return h = exist but .. GetPorcAddress 's return is 'NULL'
please help me..



This is 'pluginapi.dll' - visual basic source

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Public Interface IPlugin
ReadOnly Property Name() As String
ReadOnly Property ProcessName() As String
ReadOnly Property PluginAuthorsName() As String
ReadOnly Property Port() As String
ReadOnly Property Is_MemoryMap() As Boolean
ReadOnly Property Is_DashBoard() As Boolean
ReadOnly Property Is_MemoryHook() As Boolean
Sub Process_MemoryHook()
Sub Process_MemoryMap()
'run at start/stop
Sub StartupCommands()
Sub ShutDownCommands()
'patching
Function PatchGame(ByVal MyPath As String, ByVal MyIp As String) As Boolean
Sub PatchPathInfo()
Sub UnPatchGame(ByVal MyPath As String)
Function ValidatePatchPath(ByVal MyPath As String) As Boolean
'GameEngine - process info
Sub Process_PacketRecieved(ByVal Text As String)
'Game_Manager
Function GetDOFsUsed() As String
'output
Function Get_RollOutput() As Double
Function Get_PitchOutput() As Double
Function Get_HeaveOutput() As Double
Function Get_YawOutput() As Double
Function Get_SwayOutput() As Double
Function Get_SurgeOutput() As Double
Function Get_Extra1Output() As Double
Function Get_Extra2Output() As Double
Function Get_Extra3Output() As Double
Function Get_RollMemHook() As Double
Function Get_PitchMemHook() As Double
Function Get_HeaveMemHook() As Double
Function Get_YawMemHook() As Double
Function Get_SwayMemHook() As Double
Function Get_SurgeMemHook() As Double
Function Get_Extra1MemHook() As Double
Function Get_Extra2MemHook() As Double
Function Get_Extra3MemHook() As Double
Function Get_RollMemMap() As Double
Function Get_PitchMemMap() As Double
Function Get_HeaveMemMap() As Double
Function Get_YawMemMap() As Double
Function Get_SwayMemMap() As Double
Function Get_SurgeMemMap() As Double
Function Get_Extra1MemMap() As Double
Function Get_Extra2MemMap() As Double
Function Get_Extra3MemMap() As Double
Function Get_Dash1_Output() As String
Function Get_Dash2_Output() As String
Function Get_Dash3_Output() As String
Function Get_Dash4_Output() As String
Function Get_Dash5_Output() As String
Function Get_Dash6_Output() As String
Function Get_Dash7_Output() As String
Function Get_Dash8_Output() As String
Function Get_Dash9_Output() As String
Function Get_Dash10_Output() As String
Function Get_Dash11_Output() As String
Function Get_Dash12_Output() As String
Function Get_Dash13_Output() As String
Function Get_Dash14_Output() As String
Function Get_Dash15_Output() As String
Function Get_Dash16_Output() As String
Function Get_Dash17_Output() As String
Function Get_Dash18_Output() As String
Function Get_Dash19_Output() As String
Function Get_Dash20_Output() As String
'reset
Sub ResetDOFVars()
Sub ResetMapVars()
Sub ResetHookVars()
Sub ResetDashVars()
End Interface

Please answer

I want to use it('PluginApi.dll, game ***plugin.dll) in my program.
My development environment is 'Visual Studio 2008 - MFC C++'


HMODULE h;
h = LoadLibrary(_T("PluginApi.dll"));
typedef double (*aa)(void);
aa a;
a = (aa)GetProcAddress(h, "Get_RollOutput");
LoadLibrary 's return value h = exist

but .. GetPorcAddress 's return value is 'NULL'

please help me..