Hi Brian,

Thanks for the confirmation; yes I am now doing this with file exports 
and imports which is not too much hassle but obviously extra steps. I 
did look at the calculations involved (they are provided on the OS web 
site) with the thought of using them in DP but they are very complex 
mathematical formulae including trig functions and iterations.

Cheers,
Michael



Brian Hancock wrote:
> Hi Michael,
>
> Unfortunately you will not be able to go that route with DP. Calling the DLL
> will be a Microsoft Windows Specific function, and it would require the
> programming language to support it, DP fit neither of this, DP does not need
> have the ability to call other DOS programs. 
>
> I presume that you are now doing this with file exports and imports,
> generally that is the only way to have DP interoperate with other programs,
> with the exception of WP Shell integration, but that also will not help you
> here
>
> Bye
> Brian
>
> -----Original Message-----
> From: [email protected]
> [mailto:[email protected]] On Behalf Of Michael Iannantuoni
> Sent: Sunday, 27 September 2009 3:32 AM
> To: DataPerfect Users Discussion Group
> Subject: [Dataperf] Calling external dll
>
> Not that I'm a programmer, but does anyone know if it possible to call 
> an external dll file from a DataPerfect field formula?
>
> I am using a database that I set up which, amongst other things, shows 
> entered GB OS Grid references and converts them to all numerical format 
> using a field link to a look up table. I then export this all numerical 
> format grid ref data to a file and load it into an external programme 
> that converts the data into Longitude, Latitude & Altitude. The 
> converted data is then imported into DP.
>
> According to the instructions with the external programme, it is 
> possible to call its dll to perform the conversion from another programme.
>
> Michael
>
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