it worked. thanks @VRonin

@JonB Thanks for your insight. I did as you suggested and found one of my local variable's address a nullptr(though not sure where it came from). I changed a few lines of code and apparently, my code works fine now. @Christian-Ehrlicher @J-Hilk thanks!

@suslucoder it works. thank you

@SGaist
Good catch.
yes its x,y.
It was more about num being undeclared at that point in time :)
Changed as not to confuse future readers.

@suslucoder said in Windows not responding on reading file from txt:

It works

so please don't forget to mark your post as solved!

@alizadeh91 See https://stackoverflow.com/questions/56886410/access-local-user-file-on-qt-for-web-assembly