1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
use dbus::{blocking::Connection, arg};
use std::time::Duration;
fn print_refarg(value: &dyn arg::RefArg) {
// We don't know what type the value is. We'll try a few and fall back to
// debug printing if the value is more complex than that.
if let Some(s) = value.as_str() { println!("{}", s); }
else if let Some(i) = value.as_i64() { println!("{}", i); }
else { println!("{:?}", value); }
}
fn main() -> Result<(), Box<dyn std::error::Error>> {
// Connect to server and create a proxy object. A proxy implements several interfaces,
// in this case we'll use OrgFreedesktopDBusProperties, which allows us to call "get".
let c = Connection::new_session()?;
let p = c.with_proxy("org.mpris.MediaPlayer2.rhythmbox", "/org/mpris/MediaPlayer2", Duration::from_millis(5000));
use dbus::blocking::stdintf::org_freedesktop_dbus::Properties;
// The Metadata property is a Dict<String, Variant>.
// Option 1: we can get the dict straight into a hashmap, like this:
let metadata: arg::PropMap = p.get("org.mpris.MediaPlayer2.Player", "Metadata")?;
println!("Option 1:");
// We now iterate over the hashmap.
for (key, value) in metadata.iter() {
print!(" {}: ", key);
print_refarg(&value);
}
// As an alternative, if we just want a specific property and know the type of it, we can use
// prop_cast:
let title: Option<&String> = arg::prop_cast(&metadata, "xesam:title");
if let Some(title) = title {
println!("The title is: {}", title);
}
// Option 2: we can get the entire dict as a RefArg and get the values out by iterating over it.
let metadata: Box<dyn arg::RefArg> = p.get("org.mpris.MediaPlayer2.Player", "Metadata")?;
// When using "as_iter()" for a dict, we'll get one key, it's value, next key, it's value, etc.
let mut iter = metadata.as_iter().unwrap();
println!("Option 2:");
while let Some(key) = iter.next() {
// Printing the key is easy, since we know it's a String.
print!(" {}: ", key.as_str().unwrap());
let value = iter.next().unwrap();
print_refarg(&value);
}
Ok(())
}