Print defaults in devices.rs example. Add a hosts.rs example which displays the default host API, along with all available host APIs.

examples/devices.rs

@@ -24,6 +24,10 @@ fn run() -> Result<(), pa::Error> {
     let num_devices = try!(pa.device_count());
     println!("Number of devices = {}", num_devices);
 
+    println!("Defualt input device: {:?}", pa.default_input_device());
+    println!("Defualt output device: {:?}", pa.default_output_device());
+
+    println!("All devices:");
     for device in try!(pa.devices()) {
         let (idx, info) = try!(device);
         println!("--------------------------------------- {:?}", idx);

examples/hosts.rs

@@ -0,0 +1,14 @@
+//! Prints all Host APIs that are available on the system and that this instance of PortAudio can
+//! support.
+
+extern crate portaudio as pa;
+
+fn main() {
+    let pa = pa::PortAudio::new().unwrap();
+
+    println!("Default Host API: {:?}", pa.default_host_api());
+    println!("All Host APIs:");
+    for host in pa.host_apis() {
+        println!("{:#?}", host);
+    }
+}