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// Example of how to cancel a blocking Context operation from another
// thread.
use std::time::Duration;
use pcsc::*;
fn wait_for_enter_keypress() {
use std::io::Read;
let mut stdin = std::io::stdin();
let _ = stdin.read(&mut [0]).expect("failed to read key");
}
fn main() {
// Get a context.
let ctx = Context::establish(Scope::User).expect("failed to establish context");
// Spawn a thread which waits for a key-press then cancels the operation.
{
let ctx = ctx.clone();
std::thread::spawn(move || {
wait_for_enter_keypress();
ctx.cancel().expect("failed to cancel");
});
}
// Set up the blocking call, and wait for cancel or timeout.
println!("Entering blocking call; press Enter to cancel");
let mut reader_states = vec![ReaderState::new(PNP_NOTIFICATION(), State::UNAWARE)];
match ctx.get_status_change(Duration::from_secs(5), &mut reader_states) {
Ok(()) => {
println!("Blocking call exited normally");
}
Err(Error::Cancelled) => {
println!("Blocking call canceled");
}
Err(Error::Timeout) => {
println!("Blocking call timed out");
}
Err(error) => {
panic!("failed to get status changes: {:?}", error);
}
}
}
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