Q: Must one use special LabVIEW types (e.g. float64) for DLLs in LabWINDOWS/CVI?

Hello,
I have recently started compiling C code using LabWindows/CVI, and have successfully called a simple DLL function from within LabVIEW.
I have a question about the types defined in LabVIEW's extcode.h file:
These are defined to explicitly quantify the number of bits used for each data type (e.g. float64 instead of float) in order to eliminate ambiguity across compilers.
When I am using LabWindows/CVI to compile, do I need to use the LabView numeric types defined in LabView's extcode.h, or can I use the standard C types (int, float, etc.)?
Is there a distinction between having to use these special types for CIN versus shared library calls in LabVIEW?
Thanks
in advance,
Frenk

You do not have to use the defines in extcode.h, but you certainly can if you want to.
The float64 is equivalent to CVI's "double", and the float32 is equivalent to CVI's "float".
These correspond to the double- and single-precision types in the IEEE Standard for Floating Point Arithmetic, IEEE-754.
I hope this helps.
Brian

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I want to use Cisco 1250 series devices ( AIR-LAP1252G-E-K9 at 2.4 GHZ ) with wireless
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Go to Solution.

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Certified LabVIEW Architect, Certified TestStand Developer
NI Days (and A&DF): 2010, 2011, 2013, 2014
NI Week: 2012, 2014
Knowledgeable in all things Giant Tetris and WebSockets

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>
One observation has been the clause
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>
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I build a dll from labview, the prototype is : double getchannelpower(double f, uintptr_t *VISAResourceName);
I don't know how to pass VISAResourceName to this function.How can I get the VISAResourceName of this type(uintptr_t *)?
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Regards,

smercurio_fc wrote:
MCFSE wrote:
This is a good question that does not appear to be addressed in that other thread.
But is addressed via several NI KnowledgeBase articles and NI Community examples. For example: https://decibel.ni.com/content/docs/DOC-14564
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endif.
commit work.
chk this
Give points if useful

Q: Must one use special LabVIEW types (e.g. float64) for DLLs in LabWINDOWS/CVI?

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