QT: how do I determine wheter a chosen file is within the same folder as a new chosen destination folder?

[William de Smet]

Hi there,
I do two things :

on mouseUp
  answer file "Kies bestand:"
    if the result is "Cancel"
    then exit mouseUp
  else put it into bLijst

    answer folder "Kies map" -- selection of destination folder
  if the result is "Cancel" then exit mouseUp
  put it & "/" into bMap
end mouseup

After this I write back a new file into bMap.
But...I don't want destfolder to be the same folder as where the chosen file
is in.
Otherwise the file will be overwritten.

I tried with:
if filePath bLijst is within filePath bMap then answer error "Fout!"
but that doesn't work.

Any idea's?

Thanks!

greetings,

William de Smet