QString curPath=QDir: : currentPath ();//acquisition system in the current directory 
QString dlgTitle="open a file";//dialog title 
QString filter="program files (*. H *. CPP);; Text files (*.txt);; All files (*. *) ";//file filters 
QString aFileName=QFileDialog: : getOpenFileName (this, dlgTitle curPath, filter); 

QString STR=QDir: : currentPath (); 
//STR=QDir: : toNativeSeparators (STR); 
QString str1=QString (" % 1/name. TXT "). Arg (STR); 
QFile mdir (STR);//=STR; 
QFile mdir2 (aFileName); 
QDebug () & lt;  
 
From the value of STR and aFileName content without any distinction, why qDebug output is a false one is true?