From Tracker Software PDF SDK
Checks if it's a selection handler for specified selection (firstly the implementer should check the ID property of the selection).
HRESULT IsSelHandler([in] IPXV_Document* pDoc, [in] IPXV_DocSelection* pDocSel, [out, retval] VARIANT_BOOL* bIsHandler);
- [in] Pointer to IPXV_Document containing the source document.
- [in] Pointer to IPXV_DocSelection containing the document selection that should be checked.
- [out, retval] Pointer to VARIANT_BOOL containing whether the selection handler is a handler for the specified selection.
Returns S_OK if operation was successful or error code in other cases.