From Tracker Software PDF SDK
This method is called when new font is being found on the document's page.
HRESULT OnNewFont([in] IPXC_Font* pFont, [out, retval] VARIANT_BOOL* bCancel);
- [in] Pointer to IPXC_Font containing the new font.
- [out, retval] Pointer to VARIANT_BOOL that can be used to cancel the enumeration process.
Returns S_OK if operation was successful or error code in other cases.