'Not a valid win32 application' error - using mex files with Matlab 2011b and Visual C++ 2010 Express

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Ellen Webborn 2012-5-18

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编辑： Paola 2015-2-19

Hello

I have C++ project which compiles in Visual C++ 2010 Express, which I have set as my compiler using mex -setup in MatLab R2011b, but when I try to run this mex file from an m-file in Matlab I get the following error:

Invalid MEX-file 'C:\Users\Ellen W\Documents\Visual Studio 2010\Projects\Simulate\Debug\simulate.mexw32': C:\Users\Ellen W\Documents\Visual Studio 2010\Projects\Simulate\Debug\simulate.mexw32 is not a valid Win32 application.

I followed online instructions exactly about what settings I need for the project. My computer is Windows 7 Professional, 32bit operating system.

Thank you in advance for your help!

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Jan 2012-5-18

How do you try to "run the MEx file"?

Paola 2015-2-19

编辑：Paola 2015-2-19

I have a similar problem. In MATLAB 2012b 64 bit, when setting up the compiler, it was found when using the mex -setup command:

Please choose your compiler for building MEX-files:

Would you like mex to locate installed compilers [y]/n? y

Select a compiler: [1] Microsoft Software Development Kit (SDK) 7.1 in C:\Program Files (x86)\Microsoft Visual Studio 10.0

[0] None

However, for MATLAB 2014b 32-bit, it does not show me any other available compiler than the lcc-win32 and just the Microsoft Software Development Kit (SDK) 7.1, which seems not to be linked to Microsoft Visual Studio somehow. With each compiler I get different errors when trying to use precompiled mex-functions (both for 32 and 64 bits). For 64 bits, they are working ok. When using the lcc compiler, I get the same error, which tells me the mex32 function is not a valid Win32 application. I cannot find the way to make this work.

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Answer 1

Kaustubha Govind 2012-5-18

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https://ww2.mathworks.cn/matlabcentral/answers/38743-not-a-valid-win32-application-error-using-mex-files-with-matlab-2011b-and-visual-c-2010-expres#answer_48262

Is there a reason that you don't compile directly using the "mex" command in MATLAB? The most likely issue could be that the MEX-file depends on Visual Studio redistributables (DLLs) which are not on the System path, so MATLAB is unable to load them, which is necessary to run the MEX-file. Could you try running your MEX-file through Dependency Walker and see if you can find the missing dependencies.