MEX: no stdout in release

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Zohar
Zohar 2020-7-7
回答： Harsh 2024-8-26
I build my mex file with VS2019. I do my output with
cout << "hi" << endl;
When I build in release version, it outputs fine to matlab's console; in debug build it doesn't.

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回答（1 个）

Harsh
Harsh 2024-8-26
Hi @Lukas and @Zohar,
It seems you're attempting to print strings from C++ to MATLAB.
Here are a few alternatives you might consider:
  • Use "mexPrintf " Instead of cout: You can replace "cout" with "mexPrintf " to print directly in MATLAB. Here's an example of how to use "mexPrintf":
#include "mex.h"
void mexFunction(int nlhs, mxArray* plhs[], int nrhs, const mxArray* prhs[]) {
mexPrintf("This prints in MATLAB again!!\n");
}
  • Error Encountered in Visual Studio: On attempting the same, I noticed an issue where, after running the MEX function along with the C++ file, and then trying to rebuild, an error appears in Visual Studio.
Initially, I executed the MEX file in MATLAB. Subsequently, when I attempted to build again in Visual Studio, I encountered the following error:
This error occurs irrespective of whether you are in release or debug mode. Even when executing the MEX file from the release folder, the error persists.
  • Solution: A simple way to resolve this issue is to restart MATLAB. After doing so, the build process is completed successfully.
(As shown here, the build completes successfully even in debug mode.)
I hope this information is helpful. Thank you!

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