C DLL does not working in LabVIEW-2011, but works good in LabVIEW-2009
The C-Language dll which I have for an instrument is working good in LV2009 without any errors, but in 2011 it throws 1097 Error code. In this link, it is mentioned that calling convention in "Call Library Node" is changed since LV2010 which I guess could be the reason for the error. But trgically I need to develop my code in LV2011. Does anyone have an workaround to make the dll work in LV2011?
Thanks,
Ajay.
Solved!
Go to Solution.
And the particular issue at hand is, that stdcall functions CAN have but DON'T have to have a particular naming decoration in their exported name (a @<number> appended to the name, and LabVIEW doesn't show this decoration in the drop down box). Before LabVIEW 2010 the Call Library Node automagically corrected a configured C calling configuration to stdcall if it recognized that decoration. They removed that in 2010 because it is possible, and most probably happened in the wild, for a C function to be explicitedly named with this pattern but get exported as C calling convention. With this automatic and hidden correction, LabVIEW is totally unable to call such a function.
The not so nice thing about this would be IMHO that this automagic correction happened sneakily in the background without even being visible at all (the option in the Call Library Node stayed C calling convention, despite that LabVIEW really decided to use stdcall). And it got made even worse by the fact that 2010 removed this sneaky correction but did not add any mutation code to correct for that, when updating a VI from a previous LabVIEW version. That all said the evil has been done and can't be reversed now. Everybody just has to live with it.
Rolf Kalbermatter
CIT Engineering Netherlands
a division of Test & Measurement Solutions
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