Delphi, Visual C++ and Visual Basic

Floris Brouwer

Delphi Developer

Sat, 13 Apr 2002 03:00:00 GMT

Delphi, Visual C++ and Visual Basic

Hello,

I hope someone could give me some additional information.

I'm making COM objects in Delphi, they have to be used by VB en VC++ too and
I'm wondering;
- Should I make all interfaces dual for VB (it looks like VB only supports
dispatches).
- I'm using Istrings * for stringlist, does anybofy know about compatibility
with VB / VC++.
- I make my own errorHandling COM object, so I decided to use stdcall's
instead of safecall.

thanks in advance!
Floris.

serge_v..

Delphi Developer

Sun, 14 Apr 2002 03:00:00 GMT

Re:Delphi, Visual C++ and Visual Basic

Hi,

Quote

> I'm wondering;
> - Should I make all interfaces dual for VB (it looks like VB only
> supports dispatches).

VB5 and above supports non-dual interfaces **BUT** VBScript does not.
I strongly suggest to make all "automatable" interfaces dual.

Quote

> - I'm using Istrings * for stringlist, does anybofy know about
> compatibility with VB / VC++.

Should be without problem (use AXCtrls.GetOleString to obtain a
Borland-stamped IString object)

Quote

> - I make my own errorHandling COM object, so I decided to use
> stdcall's instead of safecall.

You could use :
- safecall with Try ... Except blocks.
- TComObject.ServerExceptionHandler
- your suggestion

Regards

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