MFC and COM components

From:
Hector Santos <sant9442@nospam.gmail.com>
Newsgroups:
microsoft.public.vc.mfc
Date:
Thu, 25 Mar 2010 19:51:07 -0400
Message-ID:
<#IoaLYHzKHA.6140@TK2MSFTNGP05.phx.gbl>
I never did this before under MFC C/C++. I added COM components to
the Toolbar

         right click the ToolBox | Choose Items

and selected some Microsoft components, specifically the Microsoft
TabStrip component. It was added to the palette and now I can drop
the control into the dialog form. Then I right click the control and
"Add Variable" to create a m_tabs class member. When you do this, the
TLB information is used to a class wrapper for the dispatch commands.
  In this case, it created, TabStrip2.h and TabStrips2.cpp.

What I want to get access to is the SelectedItem, which it has these
get/put functions to be used in property members:

    LPDISPATCH get_SelectedItem()
    {
        LPDISPATCH result;
        InvokeHelper(0xf, DISPATCH_PROPERTYGET, VT_DISPATCH, (void*)&result,
NULL);
        return result;
    }
    void putref_SelectedItem(LPDISPATCH newValue)
    {
        static BYTE parms[] = VTS_DISPATCH ;
        InvokeHelper(0xf, DISPATCH_PROPERTYPUTREF, VT_EMPTY, NULL, parms,
newValue);
    }
    void put_SelectedItem(VARIANT * newValue)
    {
        static BYTE parms[] = VTS_PVARIANT ;
        InvokeHelper(0xf, DISPATCH_PROPERTYPUT, VT_EMPTY, NULL, parms,
newValue);
    }

The question is how do use these in properties with LPDISPATCH?

For example, it is easier for a BOOL types such as get_ShowTips and
put_ShowTips:

    BOOL get_ShowTips()
    {
        BOOL result;
        InvokeHelper(0x3, DISPATCH_PROPERTYGET, VT_BOOL, (void*)&result, NULL);
        return result;
    }
    void put_ShowTips(BOOL newValue)
    {
        static BYTE parms[] = VTS_BOOL ;
        InvokeHelper(0x3, DISPATCH_PROPERTYPUT, VT_EMPTY, NULL, parms,
newValue);
    }

By adding the following property to the TabStrip2.h class:

  _declspec(property(get=get_ShowTips,put=put_ShowTips)) BOOL ShowTips;

I now can access this member in m_tabs:

     m_tabs.ShowTips = FALSE;

What class or object is get_SelectedItem returning? I looked overall
google on this and there is no MFC C/C++ example with this.

I'm just explore it really, not sure if I will use it or not.

Thanks

--
HLS

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