C++ Call Matlab error

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kameranis
kameranis 2020-12-31
评论： kameranis 2021-1-4
While executing a C++ function called by Matlab I want to report errors back to Matlab. In the C mex API there is mexErrMsgTxt, but I haven't found any corresponding C++ calls. Tried using this helper function
void mxErrorMessage(std::string msg)
{
auto args = factory.createCharArray(msg);
matlabPtr->feval(u"error", args);
}
but I get the following error when I force it to be called
Error using error
Too many output arguments.
Is there a more Matlab appropriate solution that I am missing? Why am I getting this error?
  2 个评论
Rik
Rik 2020-12-31
I have no experience with C++, but the Matlab error sounds like C++ expects the error function to return an output, which it doesn't.
kameranis
kameranis 2020-12-31
That's also how I read it, but looking at the ceval documentation I don't understand how it should be written. The only thing I can imagine is that
matlabPtr->feval(u"error", args);
is an expression and therefore it needs to have a rvalue. This still does not explain how I should be writing this.

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回答（1 个）

Rik
Rik 2020-12-31
The way I read the documentation page you linked, you need to do this:
// Call function with no output by using void as the type
matlabPtr->feval<void>(u"error", args);
  1 个评论
kameranis
kameranis 2021-1-4
Thank you for pointing this out. In the past few days I have been experimenting with getting this to work but it seems I am still missing something. I changed the data type of args from auto to a proper type, but it stills refuses to work.
void mxErrorMessage(std::string msg)
{
matlab::data::CharArray args = factory.createCharArray(msg.data());
matlabPtr->feval<void>(u"error", args);
}
The errors from mex can be found here.
It seems to be some sort of type mismatch, but I can't figure it out.

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