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Call to functions in external DLL fails

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Mehdi on 27 Mar 2016
Closed: MATLAB Answer Bot on 20 Aug 2021
I am loading a DLL along with its include file. Libfunctions lists all the functions properly. Call to the functions fail with Method not found. I verified the list of exported functions (using other tools) and they are valid.
Here is the code:
%Load Library
if not(libisloaded('Trialware'))
[notfound,warnings] = loadlibrary('Trialware.dll','TrialWare.h')
%Call function .
ret= calllib('Trialware','ReadSettingsRetStr',key, handle)
%print ret
ret= calllib('Trialware','DisplayRegistrationStr',key, handle)
%Clean up.
unloadlibrary lib
Does anyone know what is the issue? All helps appreciated.

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