[IronPython] Typing problem with vendor library?

[jeff sacksteder]

I'm finally getting back to this project. I do not know the Int16() function
that you call. Can you elaborate?

On 7/20/06, Martin Maly <Martin.Maly at microsoft.com> wrote:
>
>  The problem is that the method is called with int as the last parameter,
> but the two overloads in question take "ref Int16" and "ref UInt16". So the
> conversion is happening in the opposite direction and IronPython cannot
> safely choose between Int16 and UInt16 given that the input is Int32. They
> are both narrowing conversions.
>
>
>
> You can either select the method from Overloads, or cast the int to
> whichever type you want to use:
>
>
>
> board.AIn(channel, mode, Int16(output))
>
>
>
> Hope this helps
>
> Martin
>
>
>  ------------------------------
>
> *From:* users-bounces at lists.ironpython.com [mailto:
> users-bounces at lists.ironpython.com] *On Behalf Of *jeff sacksteder
> *Sent:* Wednesday, July 19, 2006 9:54 PM
> *To:* users at lists.ironpython.com
> *Subject:* [IronPython] Typing problem with vendor library?
>
>
>
> I have a data-acquisition device whose vendor provides a dotnet library
> for software integration. The dynamic nature of IP is giving me a bit of a
> problem. To record data from the unit, I make a method call like this:
>
> errorlevel = board.AIn(channel,mode,output)
>
> It seems that the library wants to put an UInt16 value into the 'output'
> variable. I would not expect this to be a problem, but this produces...
>
> TypeError: no overloads of AIn could match (int, Range, int)
>   AIn(int, Range, Reference[Int16])
>   AIn(int, Range, Reference[UInt16])
>
> Surely an unsigned Int16 should be able to go into an Int32?
>
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>
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