get IStream from File and Clone It

See more:

C++

COM

Hi All,

I'm trying to load an IStream on a file and share it with several classes (clients). The Code is as Follow :

IStream* pStream;

HRESULT hr = ::SHCreateStreamOnFileEx(wsfilePath, STGM_FAILIFTHERE | STGM_DIRECT_SWMR | STGM_READ | STGM_SHARE_DENY_NONE, FILE_ATTRIBUTE_READONLY, FALSE, NULL, &pStream);
if(hr == S_OK)
{
	for(auto it=ptrCallbackMap.begin();it!=ptrCallbackMap.end();++it)
	{
		IStream* cliStream ;
		HRESULT hr = pStream->Clone(&cliStream);
		if(hr == S_OK)
		{
			//etc
		}
	}
}

The problem is that the Clone method is returning E_NOT_IMPL. So I'm thinking about creating class that inherits from IStream and implements the Clone method ... but still belive there is easier way to solve the problem.

Anyone can help ??