c++ - Loading an interface fails -

i'd use com function : createinstance http://msdn.microsoft.com/en-us/library/k2cy7zfz%28v=vs.80%29.aspx

like this

ipointer p=null; hresult hr=p.createinstance(xxx); 

however don't have clsid of xxx know interface name isubpointer can see interface description inside tlb file when view file oleview. should use createinstance ?

there 2 ways this:

1st: classfactory ,and

2nd: helper function create pointer.

i found this:

int main() {     imath* pimath;     hresult hr;      // 1. initialize com library     coinitialize(null);      // 2. call cocreateinstance imath interface pointer     hr = cocreateinstance ( __uuidof(cmathcomp), null, clsctx_inproc_server,                             __uuidof(imath), (void**) &pimath );      if ( failed(hr) )     {         return 0;     }      // 3. call interface functions     int sum = pimath->add(1, 3);     printf("sum = %d \n", sum);      int sub = pimath->sub(4, 3);     printf("sub = %d \n", sub);      // 4. release interface pointer if done     pimath->release();      // 5. un-initialize com library     couninitialize();      return 0; } 

also see msdn:

hresult cocreateinstance(   _in_   refclsid rclsid,   _in_   lpunknown punkouter,   _in_   dword dwclscontext,   _in_   refiid riid,   _out_  lpvoid *ppv ); 

if can gather clsid oleview use it, otherwise there must documentation this. can't deliver component without exposing ist clsid.