Mex: C2Matlab coding. Problems with libraries while linking (error LNK2019)

Hi everybody!

This is my first question at MATLAB community. It's about mex. Here I go:

I'm integrating an external procedures for using a digital IO card using mex. The problem is that while I try to compile and link the code I get the error LNK2019.

I call the mex compiler/linker as:

if true
  mex -win64 -v -g -lWDT_DIO64.lib pruebaargumentos.cpp % code
end

After that I get:

if true
  pruebaargumentos.obj : error LNK2019: unresolved external symbol InitDIO referenced in function mexFunction 
pruebaargumentos.mexw64 : fatal error LNK1120: 1 unresolved externals % code
end

The library is at the same path my cpp program is. I've included the header but anyway I get this error.

With the option -c I got the .obj file without a problem so the only thing that remain is linking it to the library (I hope).

[Julio Ortega]

ups! Ignore the 'if true' and 'end' lines : )

[Jan]

@Julio: Instead of suggesting us to ignore these lines, you can edit your question and delete them easily. Welcome to the interactive Matlab Answers Forum!

[Julio Ortega]

I noted that

[Jan]

But the "if true, end" are still there in your message.

Answer 1

[Jan]

Try to use full paths for the file name of the library. If this works, there was a problem with finding the file in the LIBPATH. See -L argument for mex.

[Julio Ortega]

I just checked what you told me and I found that:

You where right. I only need to ad the correct path with -L and also the name of the library with -l (excluding the extension .lib) at the end it looks:

mex -win64 -v -LC:\Users\Julio\Documents\MATLAB\ConsoleApplication1 -lWDT_DIO64 pruebaargumentos.cpp

It's solved the compilation problem. Thanks Jan!