X-Git-Url: https://piware.de/gitweb/?p=learn-rust.git;a=blobdiff_plain;f=serde%2Fsrc%2Fmain.rs;h=335f836a7b9456ff16e9ade08b57e0f0bb8f27b2;hp=0c9efe90216132d2a0ff01f57352f24279c3aa07;hb=7e0b9a5fc3356ef1d7af78ace5171af606355b1b;hpb=6b86f7f9dc3b179a09341af581e7af8b518beedc

diff --git a/serde/src/main.rs b/serde/src/main.rs
index 0c9efe9..335f836 100644
--- a/serde/src/main.rs
+++ b/serde/src/main.rs
@@ -1,3 +1,5 @@
+use std::fs;
+use std::error::Error;
 use serde::{Serialize, Deserialize};
 
 #[derive(Serialize, Deserialize, Debug)]
@@ -24,13 +26,16 @@ fn build_contacts() -> Contacts {
     ]
 }
 
-fn create_contacts() {
+fn create_contacts() -> Result<(), Box<dyn Error>> {
     let contacts = build_contacts();
-    // FIXME: Use ? and return Result
-    let serialized = serde_json::to_string(&contacts).unwrap();
+    let serialized = serde_json::to_string(&contacts)?;
     println!("serialized: {}", serialized);
+    let mut f = fs::File::create("/tmp/contacts.json")?;
+    serde_json::to_writer_pretty(&mut f, &contacts)?;
+    Ok(())
 }
 
-fn main() {
-    create_contacts();
+fn main() -> Result<(), Box<dyn Error>> {
+    create_contacts()?;
+    Ok(())
 }