imwrite function in c++ shared library

Greetings,

I am compiling a matlab code which has the imwrite function in it. I want it to create an image file and write it to the disk when the c++ code calls my dll. The problem is it does not output the image file. Is it not possible to use imwrite function in a c++ shared library? If it is so, are there any alternatives to this function that will create an image file in a predefined path the user provides?

[Kojiro Saito]

Do you use MATLAB Coder or Compiler SDK for creating a dll?

[Aksay Fatih Öncel]

Compiler SDK.

[Kojiro Saito]

imwrite is supported in Compiler SDK. What is your code for calling your dll?

[Aksay Fatih Öncel]

Do you mean the C++ code?

[Kojiro Saito]

Yes, and MATLAB function, if possible. Don't you get any error?

[Walter Roberson]

Note here the difference between MATLAB Compiler SDK and MATLAB Coder.

MATLAB Coder would be for stand-alone code generation; imwrite() is not supported for that purpose.

MATLAB Compiler SDK would be for generating a DLL that called into the MATLAB Engine to do the work, requiring that MCR be present. imwrite is supported for that purpose.

I interpreted your "compile" as meaning code generation, but Kojiro Saito is correct that you could easily have meant Compiler SDK.

Answer 1

[Walter Roberson]

imwrite() is not supported for code generation, for any file type.

(and imread() supports code generation only for reading 8 bit JPEG.)

You can find external libraries to write files, such as libjpeg and libtiff and libpng

[Aksay Fatih Öncel]

Thank you, that was very prompt.

[David]

Can someone point us to an example?