How to create dll in Matlab to be used in Labview

Hi all,

I have problem with converting m-file in Matlab to dll file to be used in Labview. I used MCC to create dll from which Labview cannot find inputs and outputs. And is there any way to convert m-file to be used in Labview except using Matlab node due to its slow calculation speed? Thank you in advance.

Answer 1

[Kaustubha Govind]

I'm not sure exactly what kind of interface LabVIEW requires, but this is how you need to interface with a DLL generated using MATLAB Compiler. Note that you will also need to install the MATLAB Compiler Runtime (MCR) on the machine that the DLL is being deployed upon.

I wonder of what you actually need is a standalone DLL (independent of the MCR) - in that case using MATLAB Coder might be the better option.

[Fred Smith]

Kaustubha probably meant "MATLAB Coder might be the better option."

[Kaustubha Govind]

Oops! Yes, indeed. Thanks Fred. I fixed my answer.

[Jong-Hwan Kim]

Thank you for your answer. I used MCR and MCC to create dll, finally DLL was successfully created, but Labview still cannot find inputs and outputs. :(

[Kaustubha Govind]

Jong: How does LabVIEW "search" for interface exactly? Does it use the DLL header? Perhaps you might be able to ask NI's Technical Support team?

Answer 2

[David Roohy]

I've put together an example on how to do this from start to finish:

https://forums.ni.com/t5/Example-Program-Drafts/Walkthrough-for-Creating-a-MATLAB-DLL-That-Can-Be-Called-in/ta-p/3882891

Answer 3

[Michael Kaiser]

I'm up against the same issue. I've created both C shared libraries and C++ shared libraries, but cannot use in LabVIEW. How is the MATLAB runtime invoked, initialized?

Answer 4

[shubham kumar gupta]

GET A DLL FROM MATLAB:

mcc -v -B csharedlib:sumarray sumarray.m

create a scriptWrapper.c,scriptWrapper.h,scriptWrapper.def file[attached]

Now run below

mbuild -v sumarrayWrapper.c sumarray.lib LINKFLAGS="$LINKFLAGS /DLL /DEF:sumarrayWrapper.def" LDEXT=".dll" CMDLINE250="mt -outputresource:$EXE';'2 -manifest $MANIFEST"

now load this new scriptwrapper.dll in labview via import option, and add your old script.dll to this lvlib in labview

Always run loadFunction.vi before using your mainfunction.vi

Answer 5

[Ricardo Gutierrez]

Dear Shubham Kumar Gupta:

I tested the code for preparing matlab DLL for labview, I have some questions, maybe you can help me. How can I create the Wrapper.c file when you have multiple inputs and multiple outputs?