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<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>Int16 is a type: System.Int16 and I am calling its constructor,
passing &#8220;output&#8221; as the value:&nbsp; System.Int16(output), just like in Python you
can call:&nbsp; int(3.5), this is very similar, except constructing .NET System.Int16
type.<o:p></o:p></span></p>

<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'><o:p>&nbsp;</o:p></span></p>

<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>Martin<o:p></o:p></span></p>

<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'><o:p>&nbsp;</o:p></span></p>

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<p class=MsoNormal><b><span style='font-size:10.0pt;font-family:"Tahoma","sans-serif"'>From:</span></b><span
style='font-size:10.0pt;font-family:"Tahoma","sans-serif"'>
users-bounces@lists.ironpython.com [mailto:users-bounces@lists.ironpython.com] <b>On
Behalf Of </b>jeff sacksteder<br>
<b>Sent:</b> Friday, October 13, 2006 2:39 PM<br>
<b>To:</b> Discussion of IronPython<br>
<b>Subject:</b> Re: [IronPython] Typing problem with vendor library?<o:p></o:p></span></p>

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<p class=MsoNormal><o:p>&nbsp;</o:p></p>

<p class=MsoNormal style='margin-bottom:12.0pt'>I'm finally getting back to
this project. I do not know the Int16() function that you call. Can you
elaborate?<o:p></o:p></p>

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<p class=MsoNormal><span class=gmailquote>On 7/20/06, <b>Martin Maly</b> &lt;<a
href="mailto:Martin.Maly@microsoft.com"> Martin.Maly@microsoft.com</a>&gt;
wrote:</span><o:p></o:p></p>

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<p><span style='font-size:10.0pt;font-family:"Verdana","sans-serif";color:navy'>The
problem is that the method is called with int as the last parameter, but the
two overloads in question take &quot;ref Int16&quot; and &quot;ref
UInt16&quot;. 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.</span><o:p></o:p></p>

<p><span style='font-size:10.0pt;font-family:"Verdana","sans-serif";color:navy'>&nbsp;</span><o:p></o:p></p>

<p><span style='font-size:10.0pt;font-family:"Verdana","sans-serif";color:navy'>You
can either select the method from Overloads, or cast the int to whichever type
you want to use:</span><o:p></o:p></p>

<p><span style='font-size:10.0pt;font-family:"Verdana","sans-serif";color:navy'>&nbsp;</span><o:p></o:p></p>

<p><span style='font-size:10.0pt;font-family:"Verdana","sans-serif";color:navy'>board.AIn(channel,
mode, Int16(output))</span><o:p></o:p></p>

<p><span style='font-size:10.0pt;font-family:"Verdana","sans-serif";color:navy'>&nbsp;</span><o:p></o:p></p>

<p><span style='font-size:10.0pt;font-family:"Verdana","sans-serif";color:navy'>Hope
this helps</span><o:p></o:p></p>

<p><span style='font-size:10.0pt;font-family:"Verdana","sans-serif";color:navy'>Martin</span><o:p></o:p></p>

<p><span style='font-size:10.0pt;font-family:"Verdana","sans-serif";color:navy'>&nbsp;</span><o:p></o:p></p>

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<p><b><span style='font-size:10.0pt;font-family:"Tahoma","sans-serif"'>From:</span></b><span
style='font-size:10.0pt;font-family:"Tahoma","sans-serif"'> <a
href="mailto:users-bounces@lists.ironpython.com" target="_blank">users-bounces@lists.ironpython.com</a>
[mailto:<a href="mailto:users-bounces@lists.ironpython.com" target="_blank">
users-bounces@lists.ironpython.com</a>] <b>On Behalf Of </b>jeff sacksteder<br>
<b>Sent:</b> Wednesday, July 19, 2006 9:54 PM<br>
<b>To:</b> <a href="mailto:users@lists.ironpython.com" target="_blank">users@lists.ironpython.com</a><br>
<b>Subject:</b> [IronPython] Typing problem with vendor library?</span><o:p></o:p></p>

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<p>&nbsp;<o:p></o:p></p>

<p>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:<br>
<br>
errorlevel = board.AIn(channel,mode,output)<br>
<br>
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...<br>
<br>
TypeError: no overloads of AIn could match (int, Range, int) <br>
&nbsp; AIn(int, Range, Reference[Int16])<br>
&nbsp; AIn(int, Range, Reference[UInt16])<br>
<br>
Surely an unsigned Int16 should be able to go into an Int32?<o:p></o:p></p>

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