debugging not working

[dqian]

I am debugging a big FORTRAN code inside Visual Studio 2022. I have defined lots of structures with the elements of single variables as well as multidimensional arrays. When I debug the code and Add Watch the Structures, it shows values of the single variables, but says "<unable to read memory>".

On another computer, it cannot even display any of the variables on Add Watch.

[witwald]

At the very least, can you supply a small snippet of your code where the problem is occurring? Otherwise we are sort of flying blind here. Ideally, if you would kindly provide a small self-contained program that demonstrates the issue, that would be very helpful. Maybe even a screenshot or two?

[dqian]

I know this is a known debugger integration issue between Intel oneAPI Fortran (IFX/IFORT) and Visual Studio, specifically affecting arrays inside derived types (Fortran structures) in the Watch / Locals windows. The code is correct—the debugger is the problem.

I have already tried these steps:

1. Open Visual Studio
2. Go to Extensions → Manage Extensions
3. Search for “Fortran Expression Evaluator”
4. Install (or update) Intel Corporation – Fortran Expression Evaluator
5. Restart Visual Studio

But it does not help.