191 lines
2.8 KiB
C++
191 lines
2.8 KiB
C++
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/*++
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<EFBFBD> 1998 Seagate Software, Inc. All rights reserved
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Module Name:
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wsbvar.cpp
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Abstract:
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This class is a wrapper for the VARIANT structure, providing
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conversion and cleanup automatically. Current supported types
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for conversion are OLECHAR * (BSTR), IUnknown / IDispatch, and
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GUID. GUIDs are represented internally as strings.
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Author:
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Rohde Wakefield [rohde] 21-Jan-1997
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Revision History:
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--*/
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#include "stdafx.h"
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#include "wsb.h"
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//
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// OLECHAR (wide-character) methods
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//
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CWsbVariant::CWsbVariant ( const OLECHAR * string )
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{
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Init ( );
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if ( 0 != ( bstrVal = WsbAllocString ( string ) ) )
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vt = VT_BSTR;
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}
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CWsbVariant & CWsbVariant::operator = ( const OLECHAR * string )
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{
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Clear ( );
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if ( 0 != ( bstrVal = WsbAllocString ( string ) ) )
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vt = VT_BSTR;
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return ( *this );
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}
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CWsbVariant::operator OLECHAR * ( )
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{
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if ( VT_BSTR != vt )
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VariantChangeType ( this, this, 0, VT_BSTR );
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return ( VT_BSTR == vt ) ? bstrVal : 0;
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}
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//
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// COM Interface methods
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//
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CWsbVariant::CWsbVariant ( IUnknown * pUnk )
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{
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Init ( );
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if ( 0 != pUnk ) {
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punkVal = pUnk;
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punkVal->AddRef ( );
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vt = VT_UNKNOWN;
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}
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}
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CWsbVariant::CWsbVariant ( IDispatch * pDisp )
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{
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Init ( );
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if ( 0 != pDisp ) {
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pdispVal = pDisp;
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pdispVal->AddRef ( );
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vt = VT_DISPATCH;
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}
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}
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CWsbVariant::operator IUnknown * ( )
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{
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//
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// Ok to return IDispatch as IUnknown since it
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// derives from IUnknown
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//
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if ( IsInterface ( ) )
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return punkVal;
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return 0;
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}
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CWsbVariant::operator IDispatch * ( )
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{
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if ( IsDispatch ( ) ) {
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return pdispVal;
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}
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if ( IsInterface ( ) ) {
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IDispatch * pDisp;
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if ( SUCCEEDED ( punkVal->QueryInterface ( IID_IDispatch, (void**)&pDisp ) ) ) {
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punkVal->Release ( );
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pdispVal = pDisp;
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vt = VT_DISPATCH;
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return ( pdispVal );
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}
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}
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return 0;
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}
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CWsbVariant & CWsbVariant::operator = ( IUnknown * pUnk )
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{
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Clear ( );
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vt = VT_UNKNOWN;
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punkVal = pUnk;
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punkVal->AddRef ( );
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return ( *this );
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}
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CWsbVariant & CWsbVariant::operator = ( IDispatch * pDisp )
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{
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Clear ( );
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vt = VT_DISPATCH;
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pdispVal = pDisp;
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pdispVal->AddRef ( );
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return ( *this );
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}
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//
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// Methods to work with GUIDs
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//
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CWsbVariant::CWsbVariant ( REFGUID rguid )
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{
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Init ( );
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*this = rguid;
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}
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CWsbVariant & CWsbVariant::operator = ( REFGUID rguid )
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{
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Clear ( );
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if ( 0 != ( bstrVal = WsbAllocStringLen( 0, WSB_GUID_STRING_SIZE ) ) ) {
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if ( SUCCEEDED ( WsbStringFromGuid ( rguid, bstrVal ) ) ) {
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vt = VT_BSTR;
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}
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}
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return ( *this );
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}
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CWsbVariant::operator GUID ()
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{
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GUID guid;
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WsbGuidFromString ( (const OLECHAR *)*this, &guid );
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return guid;
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}
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