Thanks!

Your links seems to be dead.

Personally I am very happy about phasing out ActiveX. It is a major source of bugs and security gaps for Windows.

<t>I was a long time unavailable due holiday, courses. Sorry for the late response.<br/> <br/> Now I see how this help is build up.<br/> When you search for dpConnect you get in the CTR-function or in a Special Functions wich return an (undocumented) int. Where the error is handled by the GetLastErr...

<t>Various functions from WinCC OA return HRESULT<br/> A complete overview of functions returning HRESULT can be found in help -> Search -> search: <br/> <br/> <br/> E.g. dpConnect is documented as<br/> HRESULT dpConnect([in] VAROAMT vIdent, [in] VARIANT vDpName, [in, default........<br/> <br/> But ...

Does anyone know where I can find the definitaion of HRESULT?

I am unable to find it in the help in WinCC OA 3.9.
Or should I use the HRESULT defined by MS?