问题
While developing a small cross-platform game on C++, I got stuck with following issue: when players are playing with a USB gamepad without touching a keyboard or mouse, the computer sleeps automatically while they're playing.
In Windows, it can be done easily using SetThreadExecutionState function. In OS X, I think it can be done with UpdateSystemActivity but not tested yet.
But the problem is, in Linux there's nothing like a common API between DE's. I've found that in Gnome you can stop the auto-suspending by using DBus calls Inhibit()
and Uninhibit()
, but it works only for Gnome.
So, is there exists a programatically cross-DE way (or non-DE way, for example if user is using something like dwm or awesome wm) to prevent a Linux system (using Xorg and without root access of course) from sleeping or turning on screensaver without changing user configuration files?
PS: Don't think that it's too complicated, but don't know how unfortunately.
回答1:
From a quick look at how mplayer and SDL do it, there are two things you can do to prevent the screensaver from firing up:
- Disable it for the duration of the program:
- Using
XScreenSaverSuspend
- Using DBus, calling
org.freedesktop.ScreenSaver.Inhibit
- Using
- Ping it periodically:
- Using
XResetScreenSaver
- Using DBus, calling
org.freedesktop.ScreenSaver.SimulateUserActivity
- Using
回答2:
As far as I can tell, things with xdg in the name are the way to go for cross-desktop-environment functionality. There appears to be a commandline utility called xdg-screensaver. It seems to have a bunch of screensavers hardwired and then fall back to xset s off
/xset s default
, so you might want to just call it when it's installed, or fall back to copying part of its logic when it's not...
回答3:
I'm using QTDBUS using that
QDBusConnection bus = QDBusConnection::sessionBus();
if(bus.isConnected())
{
QString services[MAX_SERVICES] = {
"org.freedesktop.ScreenSaver",
"org.gnome.SessionManager"
};
QString paths[MAX_SERVICES] = {
"/org/freedesktop/ScreenSaver",
"/org/gnome/SessionManager"
};
for(int i = 0; i < MAX_SERVICES ; i++)
{
QDBusInterface screenSaverInterface(
services[i], paths[i],services[i], bus, this);
if (!screenSaverInterface.isValid())
continue;
QDBusReply<uint> reply = screenSaverInterface.call(
"Inhibit", "YOUR_APP_NAME", "REASON");
if (reply.isValid())
{
cookieID = reply.value();
qDebug()<<"succesful"
} else {
QDBusError error =reply.error();
qDebug()<<error.message()<<error.name();
}
}
}
来源:https://stackoverflow.com/questions/31498114/how-to-programmatically-prevent-linux-computer-from-sleeping-or-turning-on-scree