StdGlobalInterfaceTable provides a way for COM objects to be used from multiple threads in an application, when the threading model of the object doesn’t allow the cross-thread calls to be made from the pointer returned when the object was created.<\/p>\n
The sequence of events is as follows:<\/p>\n
<\/p>\n
Create the COM object:<\/strong><\/p>\n IDspPtr m_pDspX;<\/p>\n HRESULT hr = m_pDspX.CreateInstance(__uuidof(Dsp));<\/p>\n Now create a StdGlobalInterfaceTable object:<\/strong><\/p>\n CComPtr<IGlobalInterfaceTable> pGIT;<\/p>\n hr = CoCreateInstance(CLSID_StdGlobalInterfaceTable, Now register our object with the GIT:<\/strong><\/p>\n DWORD m_dsp_cookie; Use the GIT to get a pointer to the object (in a function that can be called from any thread)<\/strong><\/p>\n bool CPecoDsp::ReadProbe(int Mask) StdGlobalInterfaceTable provides a way for COM objects to be used from multiple threads in an application, when the threading model of the object doesn’t allow the cross-thread calls to be made from the pointer returned when the object was created. … Continue reading
\nNULL,
\nCLSCTX_INPROC_SERVER,
\nIID_IGlobalInterfaceTable,
\n(void **)&pGIT);<\/p>\n
\nhr = pGIT->RegisterInterfaceInGlobal(m_pDspX, __uuidof(IDsp), &m_dsp_cookie);
\n\/\/ m_dsp_cookie now gives us a way to access the dsp from different threads<\/p>\n
\n{
\nIDspPtr pDsp;
\nHRESULT hr = pGIT->GetInterfaceFromGlobal( m_dsp_cookie, __uuidof(IDsp), (void**)&pDsp );
\nif(FAILED(hr))
\n{
\npDsp = NULL;
\nreturn false;
\n}
\nreturn true;
\n}<\/p>\n","protected":false},"excerpt":{"rendered":"