Error when importing dll and header files using loadlibraryfunction, about #include <vector>

demo:

/*if not(libisloaded('ST_MarkDemo_CPP'))

loadlibrary('HM_Comm','HM_HashuScan.h')

end

libfunctions('HM_HashuScan');*/

erro:

'E:\X64\ST_MarkDemo_CPP_V2.0\ST_MarkDemo_CPP\HM_HashuScan.h:2:18: fatal error: vector: No such

file or directory

#include <vector>

^

compilation terminated.

///The imported header file "HM_HashuScan.h" exists #include <vector> ;May be matlab can not compile how to solve?

Thanks in advance!

Answer 1

[Abhishek Chakram]

Hi wenxue,

It appears to me that you are facing trouble in importing dll and header files using “loadlibrary” function. The error you are encountering suggests that MATLAB is unable to locate the “<vector>” header file during the compilation of a C++ library. This issue typically arises because the “loadlibrary” function uses a C compiler that does not recognize C++ headers or namespaces.

The “<vector>” header is a part of the C++ Standard Library, and its absence indicates that the necessary C++ compilation context is not being used. Functions written in C++ must be declared as extern "C".

Since “loadlibrary” primarily supports C libraries, when dealing with C++ libraries, it is often more reliable to use MATLAB C++ shared library interface. This involves creating a C++ MEX file or using the “clibgen” package to generate a MATLAB interface to the C++ library.

1. Using “clibgen” : If you are using MATLAB R2019b or later, the “clibgen” package can be used to generate a MATLAB interface to C++ libraries. Here is a basic outline for the same:

• Generate the Interface Definition File:

clibgen.generateLibraryDefinition('path/to/HM_HashuScan.h');

Adjust the path to where your header file is located.

• Review and Edit the Definition File: After generating the definition file, review it for any potential issues or adjustments needed.
• Build the MATLAB Interface:

build(defFile)

Replace “defile” with the path to your definition file.

• Use the Generated Interface: Once the interface is built, you can use the C++ functions directly in MATLAB.

2. Creating a MEX File

• Alternatively, you can wrap the C++ code that uses “<vector>” in a MEX file. This approach requires writing a wrapper code in C++ that interfaces with MATLAB and then compiling it with the “mex” command.

You can refer to the following documentation to know more about the functions used:

• loadlibrary: https://www.mathworks.com/help/matlab/ref/loadlibrary.html
• build: https://www.mathworks.com/help/matlab/ref/clibgen.librarydefinition.build.html
• clibgen.generateLibraryDefinition: https://www.mathworks.com/help/matlab/ref/clibgen.generatelibrarydefinition.html
• Steps to Publish a MATLAB Interface to a C++ Library: https://www.mathworks.com/help/matlab/matlab_external/steps-to-publish-a-matlab-interface-to-a-c-library.html
• mex: https://www.mathworks.com/help/matlab/call-mex-functions.html

Best Regards,

Abhishek Chakram