Does MATLAB compiler require prototype file instead of header file ?

i use loadlibrary command to load 2 files from the SDK. Using it in Code view of App Designer:

loadlibrary('edk.dll','Iedk.h','addheader','IedkErrorCode.h','addheader','IEmoStateDLL.h','addheader','FacialExpressionDetection.h','addheader','MentalCommandDetection.h','addheader','IEmotivProfile.h','addheader','EmotivLicense.h','alias','libIEDK');
loadlibrary('edk.dll','IEmoStateDLL.h', 'alias', 'libIEmoStateDLL');

but when successfully compiled into web app, i got a log error that

Deployed applications must use a prototype file instead of a header file. To create the prototype, use the loadlibrary mfilename option.

After searching the direction, i still have no idea to change the code to prototype file. Do you have any suggestion on this ?

Answer 1

[Kojiro Saito]

As described in this document, in order to use loadlibrary in deployed application converted by MATLAB Compiler, you need to use with prototype file name (loadlibrary(libname,@protofile)). And in order to create prototype files, you need to add 'mfilename' option to loadlibrary.

In MATLAB Command Window, do the following.

loadlibrary('edk.dll','Iedk.h','addheader','IedkErrorCode.h','addheader','IEmoStateDLL.h','addheader','FacialExpressionDetection.h','addheader','MentalCommandDetection.h','addheader','IEmotivProfile.h','addheader','EmotivLicense.h','alias','libIEDK', 'mfilename','testproto1');
loadlibrary('edk.dll','IEmoStateDLL.h', 'alias', 'libIEmoStateDLL', 'mfilename','testproto2');

Then, testproto1.m and testproto2.m will be created. After that, rewrite loadlibrary from prototype files in your App Designer app,

loadlibrary('edk.dll', @testproto1)
loadlibrary('edk.dll', @testproto2)

So, I suppose these loadlibrary would work in deployed applications.

[Nhat Khang Truong Khanh]

and after that, i need to include these created m.file into web app, right ?

[Kojiro Saito]

Yes, that's right.

[Nhat Khang Truong Khanh]

but, now, i cannot find the created .m file. According to the instruction that .m file will be on the current folder, but i didnot see anything thing.

[Kojiro Saito]

Do you have a write permission on the current folder?

If yes, can't you find those m files from Windows' File Explorer?

[Nhat Khang Truong Khanh]

i dont undersatnd "write permission on the current folder", i think i have not done that yet. Can you show me more ?

[Kojiro Saito]

From File Explorer, go to Properties of the folder and confirm your current user account has Write permission.

[Nhat Khang Truong Khanh]

i checked it and i had this permission

then, i try

libisloaded('edk.dll')

and the result gives

  logical

   0

which means fail, i dont understad that even the .m program (which is different with app designer and .m prototype file) in MATLAB runs well.

Also the prototype .m file is not created

[Kojiro Saito]

Does loadlibrary with edk.dll works in your MATLAB code before compiling it as standalone application?

Also, edk.dll is not a library created by MATLAB Compiler SDK (Library Compiler)?

I'm asking because loadlibrary has the following limitation.

loadlibrary does not support libraries generated by the MATLAB Compiler SDK™ product.

https://www.mathworks.com/help/matlab/ref/loadlibrary.html

[Pravin Mali]

I have a driver which uses ANVNADriver.m as main file and for functioning it uses c libraries .

How to generate a prototype file of ANVNADriver.m

Plz help ! .