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Hi. I will have to load an DLL file into Matlab but I do not have a dll header file. Could someone please give some examples of how to build such header file?

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Sudhanshu Bhatt
Sudhanshu Bhatt 2015-11-9

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Hi George Alin Raducu,
Unfortunately, it is not possible to load a DLL into MALTAB, without a header file. More information on this can be found in the thread below:
Dynamic Library without a H file
Below are some resources that will help you create a MATLAB function into a C/C++ Shared DLL:
Create a C/C++ Application with MATLAB Code
How do I create a C/C++ shared library with MATLAB Compiler that can be used in a Microsoft Visual C++ 2005?
Information on how to integrate the C/C++ Shared Library into your application:
Integrate a C/C++ Shared Library into an Application
Calling Functions in Shared Libraries
Also, there are some limitations to Shared Libraries integration with MATLAB:
Limitations to Shared Library Support
Hope this helps!
Thanks
Sudhanshu Bhatt

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George Alin Raducu
George Alin Raducu 2016-1-27
Hi,
Thank you very much for your information. I tried to build my own header file and create an S-function in order to load the DLL but I when I'm running the simulation I get only NULL outputs. I guess that I'm doing something wrong therefor I attach my header and c files. Would be great If someone could comment on these files.
Thank you very much!!

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Madison Radford
Madison Radford 2026-10-26，20:54

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As Sudhanshu mentioned, it is not possible to load a DLL into MATLAB without a header file.
If you want to generate a C/C++ library from a MATLAB function that includes both a DLL and a header file, see C Shared Library Integration and C++ Shared Library Integration.
As of MATLAB R2022a, the recommended way to call functions in C and C++ libraries is to publish a MATLAB interface to the library. For more information, see Call C/C++ from MATLAB.
If you are using MATLAB R2021b or earlier, you can load functions from a C shared library. For more information, see Call C from MATLAB.
Note that both of these methods require a header file.
There are some limitations to Shared Libraries support in MATLAB, which is why we recommend you use a MATLAB interface to the library.

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