[英]Util.spawnCommandLine does not work on GNOME Shell extension
I'm writing an extension for GNOME Shell to check whether VPN is connected with this command:我正在为 GNOME Shell 编写一个扩展来检查 VPN 是否与此命令连接:
ifconfig -a | grep tun
This is my extension.js file:这是我的 extension.js 文件:
const St = imports.gi.St;
const Main = imports.ui.main;
const Mainloop = imports.mainloop;
let panelOutput, panelOutputText, timeout;
function panelOutputGenerator(){
// I want to execute this command here and get the result:
// 'ifconfig -a | grep tun'
let commandResult = 'string of result that terminal is returned';
let connectionStatus = (commandResult!='')? 'VPN is Enabled' : 'Normal';
panelOutputText.set_text(connectionStatus);
return true;
}
function init(){
panelOutput = new St.Bin({
style_class: 'panel-button',
reactive: true,
can_focus: false,
x_fill: true,
y_fill: false,
track_hover: false
});
panelOutputText = new St.Label({
text: 'Normal',
style_class: 'iceLabel'
});
panelOutput.set_child(panelOutputText);
}
function enable(){
Main.panel._rightBox.insert_child_at_index(panelOutput,0);
timeout = Mainloop.timeout_add_seconds(1.0,panelOutputGenerator);
}
function disable() {
Mainloop.source_remove(timeout);
Main.panel._rightBox.remove_child(panelOutput);
}
Tried these and none of them worked:尝试了这些,但都没有奏效:
const Util = imports.misc.util;
let commandResult = Util.spawn(['/bin/bash', '-c', "ifconfig -a | grep tun"]);
const Util = imports.misc.util;
let commandResult = Util.spawnCommandLine('ifconfig -a | grep tun');
const GLib = imports.gi.GLib;
let [res, out] = GLib.spawn_sync(null,['ifconfig','-a','|','grep','tun'],null,null,null);
et commandResult = res.toString();
What should I do to execute that command and get the result?我应该怎么做才能执行该命令并获得结果?
I guess there's a couple ways you could do this.我想有几种方法可以做到这一点。 I would generally prefer
GSubprocess
for my subprocess spawning, but you could use GLib.spawn_command_line_sync()
too:我通常更喜欢
GSubprocess
来生成子GSubprocess
,但您也可以使用GLib.spawn_command_line_sync()
:
const ByteArray = imports.byteArray;
const GLib = imports.gi.GLib;
let [ok, out, err, exit] = GLib.spawn_command_line_sync('ifconfig -a');
if (ByteArray.toString(out).includes('tun')) {
// Do stuff
}
If you really want to use grep
for some reason, you could do this:如果出于某种原因你真的想使用
grep
,你可以这样做:
let [ok, out, err, exit] = GLib.spawn_command_line_sync('/bin/bash -c "ifconfig -a | grep"');
if (out.length > 0) {
// Do stuff
}
Just remember that most of these functions will return a Uint8Array
.请记住,这些函数中的大多数将返回一个
Uint8Array
。 GSubprocess on the other hand has functions that can communicate in UTF-8 with a subprocess.另一方面,GSubprocess 具有可以以 UTF-8 与子进程通信的函数。
声明:本站的技术帖子网页,遵循CC BY-SA 4.0协议,如果您需要转载,请注明本站网址或者原文地址。任何问题请咨询:yoyou2525@163.com.