Re: detour patch cocreateinstance error

I am using detours to patch CocreateInstance But i am gettting error
at runtime saying
value of ESP not properly saved.Calling Function declared with one
calling convention with a function pointer
declared with another calling convention

But it is working fine with Win32 APIs Sleep and MessageBox

Is there anything wrong with fun pointer definition.Compiler doesnot
give any error.

static long (WINAPI * True_CoCreateInstance)(REFCLSID rclsid,
                                            IUnknown* pUnkOuter,
                                            DWORD dwClsContext,
                                            REFIID riid,
                                            void** ppv) =
CoCreateInstance;

LONG Patch_CoCreateInstance( REFCLSID rclsid,
                                IUnknown* pUnkOuter,
                                DWORD dwClsContext,
                                REFIID riid,
                                 LPVOID* ppv)
{

        True_CoCreateInstance( rclsid, pUnkOuter, dwClsContext, riid,
ppv );
        return S_OK;

}

BOOL WINAPI DllMain(HINSTANCE hinst, DWORD dwReason, LPVOID reserved)
{
         if (dwReason == DLL_PROCESS_ATTACH)
         {
                    DetourTransactionBegin();
                    DetourUpdateThread(GetCurrentThread());
                   DetourAttach(&(PVOID&)True_CoCreateInstance,
Patch_CoCreateInstance);
                    DetourTransactionCommit();
         }
       else if (dwReason == DLL_PROCESS_DETACH)
      {
                 DetourTransactionBegin();
                 DetourUpdateThread(GetCurrentThread());
                DetourDetach(&(PVOID&)True_CoCreateInstance,
Patch_CoCreateInstance);
                DetourTransactionCommit();
       }
       return TRUE;

}

in the client side calling

        HINSTANCE hinstLib = NULL;
        // Get a handle to the DLL module.
        hinstLib = LoadLibrary("sleepdetour.dll");
        DWORD dwError = GetLastError();
               if (hinstLib == NULL)
               {
                return 0;
        }
        CoInitialize(NULL);

        IDetourPatchDemo * pIDetourPatchDemo = NULL;
        CoCreateInstance(CLSID_DetourPatchDemo, NULL, CLSCTX_INPROC_SERVER,\
                IID_IDetourPatchDemo, (void**)&pIDetourPatchDemo);
        pIDetourPatchDemo->Release();
        CoUninitialize( );
        FreeLibrary(hinstLib);

Thanks in advance
Bejoy