MATLAB: Does the ‘addheader’ option fail to work with the generic DLL in MATLAB 7.0 (R14)

addheaderloadlibraryMATLAB

I have created a shared library from C-code to be used with MATLAB’s generic DLL interface. For example, I have compiled a shared library named mylib.dll with header files mylib1.h and mylib2.h. I am trying to load the library with the following command:

loadlibrary(‘mylib.dll’,’mylib1.h’,’addheader’,’ mylib2.h’)

This loads the library without complaint, but I am able to use only the functionality that is prototyped in the first header file.

Best Answer

The LOADLIBRARY command will not scan multiple header files, even if the 'addheader' option is used. The 'addheader' option's intended use is to load the functions from the specified file. For example, if the library functions are prototyped in header1.h and header2.h, to load the functions from both header files you would need to include the following line in header1.h:

 #include "header2.h"

You would then use the 'addheader' option as follows:

loadlibrary(‘mylib.dll’,’header1.h’,’addheader’,’ header2.h’)

Related Solutions

MATLAB: Does LOADLIBRARY fail to include the header files even when the search path has been added using the ‘includepath’ option in MATLAB

This is expected behavior. By design, when other header files are included in the header file for the target DLL, the functions found in those headers are loaded only if an 'addheader' statement is used. One reason for this is that many headers include standard C (e.g., stdio.h) or Windows headers (e.g., windows.h) that would bring in many undesired functions with the LOADLIBRARY command.

The behavior you seek may be obtained by using the 'addheader' option to include all the additional header files as follows:

loadlibrary('mylib', 'myheader.h', 'mfilename', 'myproto', 'addheader', 'first.h',... 'addheader','second.h',  'addheader','third.h',  'addheader, 'fourth.h')
 The 'myproto.m' file should then be generated appropriately.

MATLAB: Does the generic C++ DLL not load properly in MATLAB 7.1 (R14SP3)

In order to use a generic C++ DLL in MATLAB, you need to wrap the functions in the source and header file with extern "C".

To do this, wrap the extern function prototypes with the following code:

 #ifdef __cplusplus
 extern “C” {
 #endif
 ...
 #ifdef __cplusplus
 }
 #endif

Best Answer

Related Solutions

MATLAB: Does LOADLIBRARY fail to include the header files even when the search path has been added using the ‘includepath’ option in MATLAB

MATLAB: Does the generic C++ DLL not load properly in MATLAB 7.1 (R14SP3)

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