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use crate::opc_da::{
com_utils::RemoteArray,
errors::{OpcError, OpcResult},
typedefs::ItemHandle,
};
/// Asynchronous I/O functionality (OPC DA 3.0).
///
/// Provides methods for enhanced asynchronous read/write operations with
/// quality and timestamp information.
pub trait AsyncIo3Trait {
fn interface(&self) -> OpcResult<&crate::bindings::da::IOPCAsyncIO3>;
/// Reads values with maximum age constraint.
///
/// # Arguments
/// * `server_handles` - Array of server item handles
/// * `max_age` - Maximum age constraints for each item (milliseconds)
/// * `transaction_id` - Client-provided transaction identifier
///
/// # Returns
/// Tuple containing cancel ID and array of per-item error codes
fn read_max_age(
&self,
server_handles: &[ItemHandle],
max_age: &[u32],
transaction_id: u32,
) -> OpcResult<(u32, RemoteArray<windows::core::HRESULT>)> {
if server_handles.len() != max_age.len() {
return Err(OpcError::InvalidState(
"server_handles and max_age must have the same length".to_string(),
));
}
let len = server_handles.len().try_into()?;
let mut cancel_id = 0;
let mut errors = RemoteArray::new(len);
// SAFETY: Calling COM interface method ReadMaxAge with valid handles and array pointers.
unsafe {
self.interface()?.ReadMaxAge(
len,
server_handles.as_ptr() as *const u32,
max_age.as_ptr(),
transaction_id,
&mut cancel_id,
errors.as_mut_ptr(),
)?;
}
Ok((cancel_id, errors))
}
/// Writes values with quality and timestamp information.
///
/// # Arguments
/// * `server_handles` - Array of server item handles
/// * `values` - Array of values with quality and timestamp (VQT)
/// * `transaction_id` - Client-provided transaction identifier
///
/// # Returns
/// Tuple containing cancel ID and array of per-item error codes
fn write_vqt(
&self,
server_handles: &[ItemHandle],
values: &[crate::bindings::da::tagOPCITEMVQT],
transaction_id: u32,
) -> OpcResult<(u32, RemoteArray<windows::core::HRESULT>)> {
if server_handles.len() != values.len() {
return Err(OpcError::InvalidState(
"server_handles and values must have the same length".to_string(),
));
}
let len = server_handles.len().try_into()?;
let mut cancel_id = 0;
let mut errors = RemoteArray::new(len);
// SAFETY: Calling COM interface method WriteVQT with valid handles and array pointers.
unsafe {
self.interface()?.WriteVQT(
len,
server_handles.as_ptr() as *const u32,
values.as_ptr(),
transaction_id,
&mut cancel_id,
errors.as_mut_ptr(),
)?;
}
Ok((cancel_id, errors))
}
/// Refreshes all active items with maximum age constraint.
///
/// # Arguments
/// * `max_age` - Maximum age constraint in milliseconds
/// * `transaction_id` - Client-provided transaction identifier
///
/// # Returns
/// Cancel ID for the refresh operation
fn refresh_max_age(&self, max_age: u32, transaction_id: u32) -> OpcResult<u32> {
// SAFETY: Calling COM interface method RefreshMaxAge.
unsafe { Ok(self.interface()?.RefreshMaxAge(max_age, transaction_id)?) }
}
}