CoInitialize

HRESULT CoInitialize(pReserved)

Initialize the Common Object Model library so that it can be used. With the exception of CoBuildVersion, this function must be called by applications before any other function in the library. Calls to CoInitialize must be balanced by corresponding calls to CoUninitialize. Typically, CoInitialize is called only once by the process that wants to use the COM library, although multiple calls can be made. Subsequent calls to CoInitialize return S_FALSE.

Argument	Type	Description
pReserved	void*	Reserved for future use. Presently, must be NULL.

Return Value	Meaning
S_OK	Success. Initialization has succeeded. This was the first initialization call in this process.
S_FALSE	Success. Initialization has succeeded, but this was not the first initialization call in this process.
E_UNEXPECTED	An unknown error occurred.