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use crate::opc_da::{
com_utils::RemoteArray,
errors::{OpcError, OpcResult},
};
/// Item deadband management functionality (OPC DA 3.0).
///
/// Provides methods to manage per-item deadband values. Deadband settings
/// control the minimum value change required before the server reports
/// a data change to the client.
pub trait ItemDeadbandMgtTrait {
fn interface(&self) -> OpcResult<&crate::bindings::da::IOPCItemDeadbandMgt>;
/// Sets deadband values for specified items.
///
/// # Arguments
/// * `server_handles` - Array of server item handles
/// * `deadbands` - Array of deadband percentages (0.0 to 100.0)
///
/// # Returns
/// Array of HRESULT values indicating per-item status
///
/// # Errors
/// Returns E_INVALIDARG if arrays have different lengths
fn set_item_deadband(
&self,
server_handles: &[u32],
deadbands: &[f32],
) -> OpcResult<RemoteArray<windows::core::HRESULT>> {
if server_handles.len() != deadbands.len() {
return Err(OpcError::InvalidState(
"server_handles and deadbands must have the same length".to_string(),
));
}
// Validate deadband values (0.0 to 100.0)
if deadbands.iter().any(|&v| !(0.0..=100.0).contains(&v)) {
return Err(OpcError::InvalidState(
"deadband values must be between 0.0 and 100.0".to_string(),
));
}
let len = server_handles.len().try_into()?;
let mut errors = RemoteArray::new(len);
// SAFETY: Calling COM interface method SetItemDeadband with valid pointers and array lengths.
unsafe {
self.interface()?.SetItemDeadband(
len,
server_handles.as_ptr(),
deadbands.as_ptr(),
errors.as_mut_ptr(),
)?;
}
Ok(errors)
}
/// Gets current deadband values for specified items.
///
/// # Arguments
/// * `server_handles` - Array of server item handles
///
/// # Returns
/// Tuple containing:
/// - Array of deadband percentages (0.0 to 100.0)
/// - Array of HRESULT values indicating per-item status
fn get_item_deadband(
&self,
server_handles: &[u32],
) -> OpcResult<(RemoteArray<f32>, RemoteArray<windows::core::HRESULT>)> {
let len = server_handles.len().try_into()?;
let mut errors = RemoteArray::new(len);
let mut deadbands = RemoteArray::new(len);
// SAFETY: Calling COM interface method GetItemDeadband with valid pointers and array lengths.
unsafe {
self.interface()?.GetItemDeadband(
len,
server_handles.as_ptr(),
deadbands.as_mut_ptr(),
errors.as_mut_ptr(),
)?;
}
Ok((deadbands, errors))
}
/// Removes deadband settings for specified items.
///
/// # Arguments
/// * `server_handles` - Array of server item handles
///
/// # Returns
/// Array of HRESULT values indicating per-item status
fn clear_item_deadband(
&self,
server_handles: &[u32],
) -> OpcResult<RemoteArray<windows::core::HRESULT>> {
let len = server_handles.len().try_into()?;
let mut errors = RemoteArray::new(len);
// SAFETY: Calling COM interface method ClearItemDeadband with valid pointers and array lengths.
unsafe {
self.interface()?.ClearItemDeadband(
len,
server_handles.as_ptr(),
errors.as_mut_ptr(),
)?;
}
Ok(errors)
}
}