Can't load library function from dll

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Andrés Aguilar
Andrés Aguilar 2023-11-1
评论： Andrés Aguilar 2024-3-7
Hello!
Question first:
Does anyone have an idea on why the funciton I need is not loaded?
Explanation:
I am working with a sensor and I need to call a function called
GetOpticalProbe
This function is described in an API reference document the manufacturer provided me with.
I do have all the files, .dll and .hs. namely
CHRocodile.dll
CHRocodileLib.h
CHRocodileLibErrorDef.h
CHRocodileLibPluginDef.h
CHRocodileLibSpecialFunc.h
After examining the CHRocodileLib.h I found nothing named GetOpticalProbe. I did however found something in CHRocodileLibSpecialFunc:
inline Res_t GetOpticalProbe(arguments)
and includes to some of the other heathers near the beginning:
#include "CHRocodileLib.h"
#include "CHRocodileLibErrorDef.h"
From the matlab documentation of loadlibrary, I understood that when loading a library that has includes, the other heathers should be added to the command:
loadlibrary('mylib','mylib.h','addheader','header2')
So I tried loading it like this:
loadlibrary(fullPathToDll, fullPathToCHRocodileLibSpecialFunc.h, 'addheader', 'CHRocodileLib', 'addheader', 'CHRocodileLibErrorDef')
But after executing loadlibrary, there is no sign of the function I need:
libfunctions CHRocodile
Functions in library CHRocodile:
...
GetNext...
GetOutput...
GetResponse...
...
loadlibrary does give me some warnings like
Warning: The data type 'FcnPtr' used by function RegisterSomethingCallback does not exist.
I do not read C/C++ so I find it rather hard to read any of the .h files.
Thanks in advance!
P.S.: I edited some of the names as I am not sure they are public.

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回答（1 个）

Aiswarya
Aiswarya 2023-11-30
Hi,
I understand that you are not able to load a particular function 'GetOpticalProbe' in your CHRocodile library.
One of the possible ways to resolve this issue is to specify the storage class information of the function by using "__declspec". This can be done as follows:
__declspec( dllimport ) inline Res_t GetOpticalProbe(arguments)
Then you can use the loadlibrary function to load the dllibrary and then call the function with arguments using the function "calllib" (https://www.mathworks.com/help/matlab/ref/calllib.html)
calllib('CHRocodile','GetOpticalProbe',arg1,arg2,…,argn);
You may also refer to this MATLAB answer to know more about this issue:
https://www.mathworks.com/matlabcentral/answers/156064-problem-with-c-dll-in-matlab-the-function-was-not-found-in-the-library?s_tid=answers_rc1-2_p2_Topic
Hope this helps!
  1 个评论
Andrés Aguilar
Andrés Aguilar 2024-3-7
Aiswarya, thank you very much for your reply.
I ended up achieving the same result by sending direct commands using a proprietary protocol of the manufacturer.
I'll try to sets your method though once I unentangle myself from other stuff.

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