Enum ComError 

pub enum ComError {
    Hresult {
        code: i32,
        context: &'static str,
        dispid: i32,
    },
    UnexpectedType {
        expected: &'static str,
        actual: &'static str,
    },
}

A failure originating in the COM dispatch layer.

This is the low-level error type. The public rs-teststand crate maps it onto the public crate’s Error (HRESULT → named variant).

Variants

Hresult

A COM call returned a failing HRESULT.

Fields

code: i32

The 32-bit HRESULT code (for DISP_E_EXCEPTION this is the underlying EXCEPINFO.scode, i.e. the real engine error).

context: &'static str

Which operation failed, for diagnostics.

dispid: i32

The dispatch id that was being invoked, or 0 when the failure happened outside a member call (apartment or class creation).

Without this a bare engine code says nothing about which member refused, which is the first question when one does.

UnexpectedType

A returned VARIANT did not hold the type the caller expected.

Fields

expected: &'static str

The type the wrapper asked for.

actual: &'static str

The type actually returned.

Implementations

impl ComError

pub const fn member(code: i32, context: &'static str, dispid: i32) -> Self

Builds a ComError::Hresult for a failure inside a member call.

pub const fn hresult(code: i32, context: &'static str) -> Self

Builds an ComError::Hresult from a raw code and a static context.

Trait Implementations

impl Clone for ComError

fn clone(&self) -> ComError

Returns a duplicate of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl Debug for ComError

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.

impl Display for ComError

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.

impl Eq for ComError

impl Error for ComError

fn source(&self) -> Option<&(dyn Error + 'static)>

Returns the lower-level source of this error, if any.

fn description(&self) -> &str

👎Deprecated since 1.42.0:

use the Display impl or to_string()

fn cause(&self) -> Option<&dyn Error>

👎Deprecated since 1.33.0:

replaced by Error::source, which can support downcasting

fn provide<'a>(&'a self, request: &mut Request<'a>)

🔬This is a nightly-only experimental API. (error_generic_member_access)

Provides type-based access to context intended for error reports.

impl PartialEq for ComError

fn eq(&self, other: &ComError) -> bool

Equality operator ==.

fn ne(&self, other: &Rhs) -> bool

Inequality operator !=.

impl StructuralPartialEq for ComError