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use crate::opc_da::{
com_utils::RemoteArray,
errors::{OpcError, OpcResult},
typedefs::ItemHandle,
};
use windows::Win32::System::Variant::VARIANT;
/// Synchronous I/O functionality (OPC DA 3.0).
///
/// Provides enhanced synchronous read/write operations with support for
/// quality, timestamp, and maximum age constraints.
pub trait SyncIo2Trait {
fn interface(&self) -> OpcResult<&crate::bindings::da::IOPCSyncIO2>;
/// Reads values with maximum age constraint.
///
/// # Arguments
/// * `server_handles` - Array of server item handles
/// * `max_age` - Maximum age constraints for each item in milliseconds
///
/// # Returns
/// Tuple containing:
/// - Array of item values
/// - Array of quality values
/// - Array of timestamps
/// - Array of per-item error codes
///
/// # Errors
/// Returns E_INVALIDARG if arrays are empty or have different lengths
#[allow(clippy::type_complexity)]
fn read_max_age(
&self,
server_handles: &[ItemHandle],
max_age: &[u32],
) -> OpcResult<(
RemoteArray<VARIANT>,
RemoteArray<u16>,
RemoteArray<windows::Win32::Foundation::FILETIME>,
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(),
));
}
if server_handles.is_empty() {
return Err(OpcError::InvalidState(
"server_handles cannot be empty".to_string(),
));
}
let len = server_handles.len().try_into()?;
let mut values = RemoteArray::new(len);
let mut qualities = RemoteArray::new(len);
let mut timestamps = RemoteArray::new(len);
let mut errors = RemoteArray::new(len);
// SAFETY: Calling COM interface method ReadMaxAge with valid pointers and output arrays.
unsafe {
self.interface()?.ReadMaxAge(
len,
server_handles.as_ptr() as *const u32,
max_age.as_ptr(),
values.as_mut_ptr(),
qualities.as_mut_ptr(),
timestamps.as_mut_ptr(),
errors.as_mut_ptr(),
)?;
}
Ok((values, qualities, timestamps, errors))
}
/// Writes values with quality and timestamp information.
///
/// # Arguments
/// * `server_handles` - Array of server item handles
/// * `values` - Array of value-quality-timestamp structures
///
/// # Returns
/// Array of per-item error codes
///
/// # Errors
/// Returns E_INVALIDARG if arrays are empty or have different lengths
fn write_vqt(
&self,
server_handles: &[ItemHandle],
values: &[crate::bindings::da::tagOPCITEMVQT],
) -> OpcResult<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(),
));
}
if server_handles.is_empty() {
return Err(OpcError::InvalidState(
"server_handles cannot be empty".to_string(),
));
}
let len = server_handles.len().try_into()?;
let mut errors = RemoteArray::new(len);
// SAFETY: Calling COM interface method WriteVQT with valid handle and VQT array pointers.
unsafe {
self.interface()?.WriteVQT(
len,
server_handles.as_ptr() as *const u32,
values.as_ptr(),
errors.as_mut_ptr(),
)?;
}
Ok(errors)
}
}