Enum Error 

#[non_exhaustive]
pub enum Error {
    AppNotFound(String),
    AmbiguousApp {
        query: String,
        candidates: Vec<AppInfo>,
    },
    AmbiguousWindow {
        title: String,
        candidates: Vec<WindowInfo>,
    },
    WindowNotFound(String),
    NoAppState(String),
    ElementNotFound {
        app: String,
        index: usize,
    },
    InvalidArgument(String),
    PermissionDenied(Permission),
    Unsupported(String),
    ActionFailed(String),
    StateUnavailable(String),
    Platform(String),
    Image(ImageError),
    Io(Error),
}

Everything that can go wrong while observing or driving an app.

Variants (Non-exhaustive)

Non-exhaustive enums could have additional variants added in future. Therefore, when matching against variants of non-exhaustive enums, an extra wildcard arm must be added to account for any future variants.

AppNotFound(String)

No running or installed app matched the query.

AmbiguousApp

Several running apps matched the query equally well.

Fields

query: String

The query.

candidates: Vec<AppInfo>

The matching apps.

AmbiguousWindow

Several of an app’s windows matched a title.

Fields

title: String

The title.

candidates: Vec<WindowInfo>

The matching windows.

WindowNotFound(String)

The app is running but has no window that can be observed.

NoAppState(String)

An action referenced app state that was never captured (or was discarded).

ElementNotFound

An element index did not exist in the latest captured state.

Fields

app: String

App the lookup was made against.

index: usize

The requested element index.

InvalidArgument(String)

A caller-supplied argument was invalid.

PermissionDenied(Permission)

A required OS permission has not been granted to this process.

Unsupported(String)

The operation is not available on this platform or backend.

ActionFailed(String)

The platform accepted the request but reported that it failed.

StateUnavailable(String)

The state the action needs is missing (for example, no screenshot was captured).

Platform(String)

A platform API returned an unexpected error.

Image(ImageError)

Encoding a screenshot failed.

Io(Error)

An I/O error, for example while launching an app.

Trait Implementations

impl Debug for Error

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

Formats the value using the given formatter.

impl Display for Error

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

Formats the value using the given formatter.

impl Error for Error

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 From<Error> for Error

fn from(source: Error) -> Self

Converts to this type from the input type.

impl From<ImageError> for Error

fn from(source: ImageError) -> Self

Converts to this type from the input type.