Qt - 如何检测应用程序是否在GNOME或KDE上运行？

Question

I was wondering how I could do something like this ( source ) using Qt. I looked through the documentation but couldn't find any method to check if an external process is running.

if [ "$(pidof ksmserver)" ]; then
   echo "KDE running."
   # KDE-specific stuff here
elif [ "$(pidof gnome-session)" ]; then
   echo "GNOME running."
   # GNOME-specific stuff here
elif [ "$(pidof xfce-mcs-manage)" ]; then
   echo "Xfce running."
   # Xfce-specific stuff here
fi

Answer 1

Normally you shouldn't do this. Generally, if your application behaves differently depending on desktop environment, that will be a nasty surprise for any user that switches between them.

The alternative

Use DE-agnostic commands like xdg-open . Advantages:

• You don't have to write the logic yourself (xdg-utils already has done this)
• More user-friendly. It follows the user's actual preferences; many users use one DE but prefer some applications from a different DE.
• Supports other DEs like XFCE, LXDE, Unity, etc..

For example, instead of opening a URL in Firefox or Konqueror according to the currently-running DE, pass the URL to xdg-open to open it in the user's preferred application. (The user might be a Chromium user.) Don't hard-code nautilus or dolphin for GNOME and KDE; instead open the path using xdg-open .

Similarly, for other forms of interaction with the DE, try to use Freedesktop specifications , rather than trying to guess what DE is running. Standards exist for moving files to the trash , adding system tray applets, and adding files to the Recent Files list, among others.

Answer 2

Use QProcess to run pidof foo , then check its stdout? If this is not what you want, search /proc/ .

Answer 3

I believe the correct way to do what pidof does is to look at entries in /proc. There's another thread on this here: Find PID of a Process by Name without Using popen() or system()