c++ CoCreateInstance method return "No Such Interface supported"

May 21, 2015 0 Comments

I am getting the error “No such interface supported” when I call the CoCreateInstance() in dll. I am trying to create an instance of IGroupPolicyObject. When I run this sample code snippet through exe it returns S_OK but if I run through DLL then I get an error.
I have added the sample code snippet.

HRESULT hr =S_OK;
IGroupPolicyObject* pLGPO = NULL;

// MSVC is finicky about these ones => redefine them
const IID my_IID_IGroupPolicyObject = 
 { 0xea502723, 0xa23d, 0x11d1, {0xa7, 0xd3, 0x0, 0x0, 0xf8, 0x75, 0x71, 0xe3} };

const IID my_CLSID_GroupPolicyObject = 
 { 0xea502722, 0xa23d, 0x11d1, {0xa7, 0xd3, 0x0, 0x0, 0xf8, 0x75, 0x71, 0xe3} };

GUID ext_guid = REGISTRY_EXTENSION_GUID;

// This next one can be any GUID you want
GUID snap_guid = { 0x3d271cfc, 0x2bc6, 0x4ac2, {0xb6, 0x33, 0x3b, 0xdf, 0xf5, 0xbd, 0xab, 0x2a} };

CoInitializeEx(NULL, COINIT_APARTMENTTHREADED);

// Create an instance of the IGroupPolicyObject class
hr = CoCreateInstance(my_CLSID_GroupPolicyObject,
                      NULL,
                      CLSCTX_INPROC_SERVER,
                      my_IID_IGroupPolicyObject,
                      (LPVOID*)&pLGPO
                     );

if (SUCCEEDED(hr))
{   
    hr = pLGPO->OpenLocalMachineGPO( GPO_OPEN_LOAD_REGISTRY);
}

Please tell me am I doing anything wrong?

Source: dll