QFile path's toNativeSeparators returns wrong value on separator

[Puppy Bear]

HI everyone
I'm trying to set a path with this function
void Save_DB::set_new_path(QString path)
{
new_path = QDir::toNativeSeparators(path);
if (!QFile(new_path).exists())
qDebug() << "file not exist！\n";
return;
}
and try to examine it with my own file.
I'm pretty sure that there's something wrong with tonativeSeparators

my input is
D:/XL_db.db
and the QFile.exists() returns false
I've printed it which shows
D:XL_db.db

any idea of convertion of different separators like '' '//' '/' '\' in win10 msvc2015 qt4.9?

[J.Hilk]

@Puppy-Bear if you're using QFile, than there is no need for toNativeSeparators QFile operates on normal forwards slashes and handles those automatically correctly, when talking to system level functions/apis

[jsulm]

@Puppy-Bear said in Qt's toNativeSeparators returns wrong value on separator:

I've printed it which shows

How?
I'm pretty sure the issue is not QDir::toNativeSeparators.

[Puppy Bear]

@J-Hilk Thanks for the help,
I've searched and think i'm supposed to use '/' in windows,
but is it possible to make different separators converted to the right one?
espically when the path is given by a user?

[J.Hilk]

@Puppy-Bear said in QFile path's toNativeSeparators returns wrong value on separator:

@J-Hilk Thanks for the help,
I've searched and think i'm supposed to use '/' in windows,
but is it possible to make different separators converted to the right one?
espically when the path is given by a user?

no, not when you're using Qt!
QFile is able to work with both, no problem at all.

int main(int argc, char *argv[])
{
    QGuiApplication app(argc, argv);

    QFile fileFSlash("C:/Qt/Tools/QtCreator/bin/qtcreator.exe");
    QFile fileBSlash("C:\\Qt\\Tools\\QtCreator\\bin\\qtcreator.exe");

    qDebug() << fileFSlash.exists() << fileBSlash.exists(); //results in true and true

}

[kkoehne]

@Puppy-Bear said in QFile path's toNativeSeparators returns wrong value on separator:

but is it possible to make different separators converted to the right one?

@J-Hilk is right that you don't have to convert to forward slashes. But you can use QDir::fromNativeSeparators() to normalize to forward slashes on all platforms.

Or go through QFileInfo - QFileInfo("C:\\dev") .filePath() will also return "C:/dev".

[KroMignon]

@Puppy-Bear said in QFile path's toNativeSeparators returns wrong value on separator:

any idea of convertion of different separators like '' '//' '/' '' in win10 msvc2015 qt4.9?

First, please note that Qt internally always uses / as path separator, event when running on Windows.
BUT you can use QDir::toNativeSeparators() to convert a path to use the native notation.
This can be useful when you want to use the path with an external application.