ストリーム(IStream)の読み込み

    // shlwapi.dll version 5.0 or later 互換

    static HRESULT Emulete_IStream_Read(

        IStream *pstm,

        VOID *pv,

        ULONG cb)

    {

        if (pstm == NULL)

        {

            return E_FAIL;

        }

        HRESULT hr = S_OK;

        try

        {

            ULONG cbRead = 0;

            hr = pstm->Read(pv, cb, &cbRead);

            if (FAILED(hr))

            {

                return hr;

            }

        }

        catch (...)

        {

            return E_FAIL;

        }

        return hr;

    }