why QProcess not show output of ls /dev/sd* command ?
-
@Qt-embedded-developer said in why QProcess not show output of ls /dev/sd* command ?:
i think its not relative path this is absolute path
How is ls an absolute path?!
On my Ubuntu machine the absolute path to ls is /usr/bin/lsI'm wondering why you need QProcess for such a task at all? You can simply use https://doc.qt.io/qt-6/qdir.html
-
@Qt-embedded-developer
Because your/dev/sd*has a*wildcard in it.ls(or any other Linux command) does not expand wildcards. Only a shell expands wildcards! If you want to do it this way you will need:Command = "/bin/sh"; args << "-c" << "ls /dev/sd*";Note that running a command to expand a filepath like this is not "efficient". You could do the work from, say, Qt
QDiron/devand look through the child filenames yourself to see which start withsd. OrQFileInfoList QDir::entryInfoList(const QStringList &nameFilters, QDir::Filters filters = NoFilter, QDir::SortFlags sort = NoSort) constcould be used to do the wildcard matching. This would also be a lot cleaner than your code trying to parsels's output.@JonB said in why QProcess not show output of ls /dev/sd* command ?:
QFileInfoList QDir::entryInfoList(const QStringList &nameFilters, QDir::Filters filters = NoFilter, QDir::SortFlags sort = NoSort) const
as per my case what i need to write in above ?
-
@jsulm means i just need to check there is file name start with sd is there on not int /dev directory
@Qt-embedded-developer Yes, get entries in /dev folder using QDir::entryInfoList and filter all entries starting with sd (you can pass file name filter directly to QDir::entryInfoList).
-
@JonB said in why QProcess not show output of ls /dev/sd* command ?:
QFileInfoList QDir::entryInfoList(const QStringList &nameFilters, QDir::Filters filters = NoFilter, QDir::SortFlags sort = NoSort) const
as per my case what i need to write in above ?
@Qt-embedded-developer said in why QProcess not show output of ls /dev/sd* command ?:
as per my case what i need to write in above ?
What exactly is not clear?
-
@Qt-embedded-developer said in why QProcess not show output of ls /dev/sd* command ?:
as per my case what i need to write in above ?
What exactly is not clear?
-
@jsulm sorry its clear. i have to try. but if possible can you give example so it can help better.
@Qt-embedded-developer said in why QProcess not show output of ls /dev/sd* command ?:
but if possible can you give example so it can help better.
Maybe reading the answers would help - it was already given...
-
@Qt-embedded-developer said in why QProcess not show output of ls /dev/sd* command ?:
but if possible can you give example so it can help better.
Maybe reading the answers would help - it was already given...
@Christian-Ehrlicher i have tried like below but i am getting empty list from fileinfolist
QString myPath="/dev"; QDir dir; dir.setPath(myPath); QStringList filters; filters<<"sd"; dir.setFilter( QDir::AllEntries | QDir::System); dir.setNameFilters(filters); dir.setSorting(QDir::Name ); QFileInfoList list = dir.entryInfoList();why my list is not giving file name what is expected ?
-
Because there is no
/dev/sdin your directory. Please read the documentation... -
Because there is no
/dev/sdin your directory. Please read the documentation...@Christian-Ehrlicher actually above code i written to find name that start with sd .
-
@Christian-Ehrlicher actually above code i written to find name that start with sd .
@Qt-embedded-developer said in why QProcess not show output of ls /dev/sd* command ?:
actually above code i written to find name that start with sd .
No, RTFM!
-
@Christian-Ehrlicher i have tried like below but i am getting empty list from fileinfolist
QString myPath="/dev"; QDir dir; dir.setPath(myPath); QStringList filters; filters<<"sd"; dir.setFilter( QDir::AllEntries | QDir::System); dir.setNameFilters(filters); dir.setSorting(QDir::Name ); QFileInfoList list = dir.entryInfoList();why my list is not giving file name what is expected ?
@Qt-embedded-developer said in why QProcess not show output of ls /dev/sd* command ?:
filters<<"sd";void QDir::setNameFilters(const QStringList &nameFilters)
Each name filter is a wildcard (globbing) filter that understands
*and?wildcards. See QRegularExpression::fromWildcard().
