Supports function

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3 total messages Started by Carlos Mon, 21 Jan 2008 19:44

#734

Author: Carlos
Date: Mon, 21 Jan 2008 19:44

16 lines
1312 bytes

Hello,

I am trying to use Supports function of SysUtils. But I don�t know how

TWinControl * pAC = Screen->ActiveControl;

            if ( pAC )
            {
                TcxCustomEdit * pCE = NULL;
                if ( Supports(pAC, _di_IcxInnerEditHelper) || Supports(pAC, 
_di_IcxContainerInnerControl) )
                    pCE = (TcxCustomEdit *)pAC->Owner;

Which is the correction ?

Thank you

Re: Supports function

#742

Author: Remy Lebeau (TeamB)
Date: Tue, 22 Jan 2008 19:30

42 lines
2019 bytes

"Carlos" <a@a.com> wrote in message 
news:4794f632$1@newsgroups.borland.com...

> I am trying to use Supports function of SysUtils. But I don�t know how

You are passing the interface types the wrong way.  Do not use the '_di_...' 
typedefs.  You need to use the interface IIDs instead, ie:

    TWinControl *pAC = Screen->ActiveControl;
    if( pAC )
    {
        TcxCustomEdit *pCE = NULL;
        if( Supports(pAC, IID_IcxInnerEditHelper) || Supports(pAC, 
IID_IcxContainerInnerControl) )
            pCE = (TcxCustomEdit*) pAC->Owner;
        //...
    }

Or:

    TWinControl *pAC = Screen->ActiveControl;
    if( pAC )
    {
        TcxCustomEdit *pCE = NULL;
        if( Supports(pAC, __uuidof(IcxInnerEditHelper)) || Supports(pAC, 
__uuidof(IcxContainerInnerControl)) )
            pCE = (TcxCustomEdit*) pAC->Owner;
        //...
    }

Or, you could simply use dynamic_cast and ignore Supports() altogether:

    TWinControl * pAC = Screen->ActiveControl;
    if( pAC )
    {
        TcxCustomEdit *pCE = dynamic_cast<TcxCustomEdit*>(pAC->Owner);
        //...
    }


Gambit

Re: Supports function

#529

Author: Carlos
Date: Mon, 28 Jan 2008 13:28

1 lines
1045 bytes

Thank you

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