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Showing content from https://docs.microsoft.com/en-us/windows/win32/api/combaseapi/nf-combaseapi-clsidfromstring below:

CLSIDFromString function (combaseapi.h) - Win32 apps

CLSIDFromString function (combaseapi.h)

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Converts a string generated by the StringFromCLSID function back into the original CLSID.

Syntax 
HRESULT CLSIDFromString(
  [in]  LPCOLESTR lpsz,
  [out] LPCLSID   pclsid
);
Parameters

[in] lpsz

The zero terminated string representation of the CLSID or the ProgID or NULL.

[out] pclsid

A pointer to the CLSID.

Return value

This function can return the standard return value E_INVALIDARG, as well as the following values.

Return code Description
NOERROR
The CLSID was obtained successfully.
CO_E_CLASSSTRING
The class string was improperly formatted.

The CLSID format is {xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx}.

Passing the ProgID results in saving associated CLSID in pclsid. Passing NULL results in GUID_NULL.

Requirements Requirement Value Minimum supported client Windows 2000 Professional [desktop apps | UWP apps] Minimum supported server Windows 2000 Server [desktop apps | UWP apps] Target Platform Windows Header combaseapi.h (include Objbase.h) Library Ole32.lib DLL Ole32.dll See also

CLSIDFromProgID

StringFromCLSID

Additional resources

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