error LNK2019 occurs when running C Caller block in Simulink

I made a very simple example of C Caller block to see how it works, but I got link error which I can't find out what the reason is.

in AudioDB.h

I created FuncTest() in C code.

in AudioDB.cpp

in Simulation Target menu of Configuration Parameters dialog,

I added like below

• Header file : #include "AudioDB.h"
• Source files : AudioDB.cpp

I put the .h, cpp files in the same directory with the model file, so I didnt add anything in the include directories item.

then I made parsing custom coded in model successfully, and tried to hook this function up with C Caller block.

but when i start compiling/running the model, I got a link error regarding external interface like below, I have no idea what I should do to solve this error.

Thank you.

Answer 1

[Juyeon Hong]

I found the solution, I didnt change the language mode Matlab language into C language.

It works after I set the language as C.

Thank you.

Answer 2

[Chidvi Modala]

I am assuming that you included header file in the “Insert Custom Code in generated” section and

source code in the “Additional build information” section inside Configuration Parameters>>Simulation

Target.

From my understanding, you would like to use your source code inside Simulink. Include the source file and the header file as shown ‘AudioDB.cpp’(including quotes) #include "AudioDB.h". I also assume that you know that the C Caller block integrates your external C code into Simulink. You can refer to this link to see if this helps

https://www.mathworks.com/help/simulink/ug/integrate-ccode-ccaller.html