Error with using loadlibrary() with .lib file

Question

Mark Kelly 2024-3-1

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/2089151-error-with-using-loadlibrary-with-lib-file

回答： Gyan Vaibhav 2024-3-7

I'm trying to get MATLAB to load the library of an NI library file (.lib) named FlexMS32.lib. I downloaded the 32-bit MATLAB R2015b environment so it could interface with the file. However, when I try to load it, it returns this error:

Error using loaddefinedlibrary
...FlexMS32.lib is not a valid Win32 application.

I have no idea why it's returning this error. This is all the code I'm running:

loadlibrary('FlexMS32.lib', 'flexmotn.h', ...
    'addheader', 'flexcomp.h', ...
    'addheader', 'MotnCnst.h', ...
    'addheader', 'MotnErr.h', ... 
    'addheader', 'nimcBasicTypes.h' ...
);

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Answer 1

Gyan Vaibhav 2024-3-7

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https://ww2.mathworks.cn/matlabcentral/answers/2089151-error-with-using-loadlibrary-with-lib-file#answer_1422281

Hi Mark,

If you could provide the lib file it would be easier for me to determine the error. However, looking at the error, I feel there are two possible reasons for this.

Static libraries can't be loaded using loadlibrary. You have to convert it to a dll before using it. I've also read from another question's answer that one way to do this is to create a mex file that calls the function in the library.
The error also suggests a possiblity that that a 64 bit operating system is trying to load a 32 bit Win32 file. Follow this answer to use the workaround. https://www.mathworks.com/matlabcentral/answers/99364-how-do-i-resolve-loadlibrary-failed-with-error-193-1-is-not-a-valid-win32-error-message-in-simul

Hope this helps.

Thanks

Gyan