Trait OutputStreamExt

pub trait OutputStreamExt: IsA<OutputStream> + 'static {
    // Provided methods
    fn clear_pending(&self) { ... }
    fn close(
        &self,
        cancellable: Option<&impl IsA<Cancellable>>,
    ) -> Result<(), Error> { ... }
    fn close_async<P: FnOnce(Result<(), Error>) + 'static>(
        &self,
        io_priority: Priority,
        cancellable: Option<&impl IsA<Cancellable>>,
        callback: P,
    ) { ... }
    fn close_future(
        &self,
        io_priority: Priority,
    ) -> Pin<Box_<dyn Future<Output = Result<(), Error>> + 'static>> { ... }
    fn flush(
        &self,
        cancellable: Option<&impl IsA<Cancellable>>,
    ) -> Result<(), Error> { ... }
    fn flush_async<P: FnOnce(Result<(), Error>) + 'static>(
        &self,
        io_priority: Priority,
        cancellable: Option<&impl IsA<Cancellable>>,
        callback: P,
    ) { ... }
    fn flush_future(
        &self,
        io_priority: Priority,
    ) -> Pin<Box_<dyn Future<Output = Result<(), Error>> + 'static>> { ... }
    fn has_pending(&self) -> bool { ... }
    fn is_closed(&self) -> bool { ... }
    fn is_closing(&self) -> bool { ... }
    fn set_pending(&self) -> Result<(), Error> { ... }
    fn splice(
        &self,
        source: &impl IsA<InputStream>,
        flags: OutputStreamSpliceFlags,
        cancellable: Option<&impl IsA<Cancellable>>,
    ) -> Result<isize, Error> { ... }
    fn splice_async<P: FnOnce(Result<isize, Error>) + 'static>(
        &self,
        source: &impl IsA<InputStream>,
        flags: OutputStreamSpliceFlags,
        io_priority: Priority,
        cancellable: Option<&impl IsA<Cancellable>>,
        callback: P,
    ) { ... }
    fn splice_future(
        &self,
        source: &(impl IsA<InputStream> + Clone + 'static),
        flags: OutputStreamSpliceFlags,
        io_priority: Priority,
    ) -> Pin<Box_<dyn Future<Output = Result<isize, Error>> + 'static>> { ... }
    fn write(
        &self,
        buffer: &[u8],
        cancellable: Option<&impl IsA<Cancellable>>,
    ) -> Result<isize, Error> { ... }
    fn write_bytes(
        &self,
        bytes: &Bytes,
        cancellable: Option<&impl IsA<Cancellable>>,
    ) -> Result<isize, Error> { ... }
    fn write_bytes_async<P: FnOnce(Result<isize, Error>) + 'static>(
        &self,
        bytes: &Bytes,
        io_priority: Priority,
        cancellable: Option<&impl IsA<Cancellable>>,
        callback: P,
    ) { ... }
    fn write_bytes_future(
        &self,
        bytes: &Bytes,
        io_priority: Priority,
    ) -> Pin<Box_<dyn Future<Output = Result<isize, Error>> + 'static>> { ... }
}

Trait containing all OutputStream methods.

Implementors

FileOutputStream, FilterOutputStream, MemoryOutputStream, OutputStream, PollableOutputStream, UnixOutputStream

Provided Methods

fn clear_pending(&self)

Clears the pending flag on @self.

fn close( &self, cancellable: Option<&impl IsA<Cancellable>>, ) -> Result<(), Error>

Closes the stream, releasing resources related to it.

Once the stream is closed, all other operations will return IOErrorEnum::Closed. Closing a stream multiple times will not return an error.

Closing a stream will automatically flush any outstanding buffers in the stream.

Streams will be automatically closed when the last reference is dropped, but you might want to call this function to make sure resources are released as early as possible.

Some streams might keep the backing store of the stream (e.g. a file descriptor) open after the stream is closed. See the documentation for the individual stream for details.

On failure the first error that happened will be reported, but the close operation will finish as much as possible. A stream that failed to close will still return IOErrorEnum::Closed for all operations. Still, it is important to check and report the error to the user, otherwise there might be a loss of data as all data might not be written.

If @cancellable is not None, then the operation can be cancelled by triggering the cancellable object from another thread. If the operation was cancelled, the error IOErrorEnum::Cancelled will be returned. Cancelling a close will still leave the stream closed, but there some streams can use a faster close that doesn’t block to e.g. check errors. On cancellation (as with any error) there is no guarantee that all written data will reach the target.

cancellable

optional cancellable object

Returns

true on success, false on failure

fn close_async<P: FnOnce(Result<(), Error>) + 'static>( &self, io_priority: Priority, cancellable: Option<&impl IsA<Cancellable>>, callback: P, )

Requests an asynchronous close of the stream, releasing resources related to it. When the operation is finished @callback will be called. You can then call g_output_stream_close_finish() to get the result of the operation.

For behaviour details see g_output_stream_close().

The asynchronous methods have a default fallback that uses threads to implement asynchronicity, so they are optional for inheriting classes. However, if you override one you must override all.

io_priority

the io priority of the request.

cancellable

optional cancellable object

callback

a #GAsyncReadyCallback to call when the request is satisfied

fn close_future( &self, io_priority: Priority, ) -> Pin<Box_<dyn Future<Output = Result<(), Error>> + 'static>>

fn flush( &self, cancellable: Option<&impl IsA<Cancellable>>, ) -> Result<(), Error>

Forces a write of all user-space buffered data for the given @self. Will block during the operation. Closing the stream will implicitly cause a flush.

This function is optional for inherited classes.

If @cancellable is not None, then the operation can be cancelled by triggering the cancellable object from another thread. If the operation was cancelled, the error IOErrorEnum::Cancelled will be returned.

cancellable

optional cancellable object

Returns

true on success, false on error

fn flush_async<P: FnOnce(Result<(), Error>) + 'static>( &self, io_priority: Priority, cancellable: Option<&impl IsA<Cancellable>>, callback: P, )

Forces an asynchronous write of all user-space buffered data for the given @self. For behaviour details see g_output_stream_flush().

When the operation is finished @callback will be called. You can then call g_output_stream_flush_finish() to get the result of the operation.

io_priority

the io priority of the request.

cancellable

optional #GCancellable object, None to ignore.

callback

a #GAsyncReadyCallback to call when the request is satisfied

fn flush_future( &self, io_priority: Priority, ) -> Pin<Box_<dyn Future<Output = Result<(), Error>> + 'static>>

fn has_pending(&self) -> bool

Checks if an output stream has pending actions.

Returns

true if @self has pending actions.

fn is_closed(&self) -> bool

Checks if an output stream has already been closed.

Returns

true if @self is closed. false otherwise.

fn is_closing(&self) -> bool

Checks if an output stream is being closed. This can be used inside e.g. a flush implementation to see if the flush (or other i/o operation) is called from within the closing operation.

Returns

true if @self is being closed. false otherwise.

fn set_pending(&self) -> Result<(), Error>

Sets @self to have actions pending. If the pending flag is already set or @self is closed, it will return false and set @error.

Returns

true if pending was previously unset and is now set.

fn splice( &self, source: &impl IsA<InputStream>, flags: OutputStreamSpliceFlags, cancellable: Option<&impl IsA<Cancellable>>, ) -> Result<isize, Error>

Splices an input stream into an output stream.

source

a #GInputStream.

flags

a set of #GOutputStreamSpliceFlags.

cancellable

optional #GCancellable object, None to ignore.

Returns

a #gssize containing the size of the data spliced, or -1 if an error occurred. Note that if the number of bytes spliced is greater than G_MAXSSIZE, then that will be returned, and there is no way to determine the actual number of bytes spliced.

fn splice_async<P: FnOnce(Result<isize, Error>) + 'static>( &self, source: &impl IsA<InputStream>, flags: OutputStreamSpliceFlags, io_priority: Priority, cancellable: Option<&impl IsA<Cancellable>>, callback: P, )

Splices a stream asynchronously. When the operation is finished @callback will be called. You can then call g_output_stream_splice_finish() to get the result of the operation.

For the synchronous, blocking version of this function, see g_output_stream_splice().

source

a #GInputStream.

flags

a set of #GOutputStreamSpliceFlags.

io_priority

the io priority of the request.

cancellable

optional #GCancellable object, None to ignore.

callback

a #GAsyncReadyCallback to call when the request is satisfied

fn splice_future( &self, source: &(impl IsA<InputStream> + Clone + 'static), flags: OutputStreamSpliceFlags, io_priority: Priority, ) -> Pin<Box_<dyn Future<Output = Result<isize, Error>> + 'static>>

fn write( &self, buffer: &[u8], cancellable: Option<&impl IsA<Cancellable>>, ) -> Result<isize, Error>

Tries to write @count bytes from @buffer into the stream. Will block during the operation.

If count is 0, returns 0 and does nothing. A value of @count larger than G_MAXSSIZE will cause a IOErrorEnum::InvalidArgument error.

On success, the number of bytes written to the stream is returned. It is not an error if this is not the same as the requested size, as it can happen e.g. on a partial I/O error, or if there is not enough storage in the stream. All writes block until at least one byte is written or an error occurs; 0 is never returned (unless @count is 0).

If @cancellable is not None, then the operation can be cancelled by triggering the cancellable object from another thread. If the operation was cancelled, the error IOErrorEnum::Cancelled will be returned. If an operation was partially finished when the operation was cancelled the partial result will be returned, without an error.

On error -1 is returned and @error is set accordingly.

buffer

the buffer containing the data to write.

cancellable

optional cancellable object

Returns

Number of bytes written, or -1 on error

fn write_bytes( &self, bytes: &Bytes, cancellable: Option<&impl IsA<Cancellable>>, ) -> Result<isize, Error>

A wrapper function for g_output_stream_write() which takes a #GBytes as input. This can be more convenient for use by language bindings or in other cases where the refcounted nature of #GBytes is helpful over a bare pointer interface.

However, note that this function may still perform partial writes, just like g_output_stream_write(). If that occurs, to continue writing, you will need to create a new #GBytes containing just the remaining bytes, using g_bytes_new_from_bytes(). Passing the same #GBytes instance multiple times potentially can result in duplicated data in the output stream.

bytes

the #GBytes to write

cancellable

optional cancellable object

Returns

Number of bytes written, or -1 on error

fn write_bytes_async<P: FnOnce(Result<isize, Error>) + 'static>( &self, bytes: &Bytes, io_priority: Priority, cancellable: Option<&impl IsA<Cancellable>>, callback: P, )

This function is similar to g_output_stream_write_async(), but takes a #GBytes as input. Due to the refcounted nature of #GBytes, this allows the stream to avoid taking a copy of the data.

However, note that this function may still perform partial writes, just like g_output_stream_write_async(). If that occurs, to continue writing, you will need to create a new #GBytes containing just the remaining bytes, using g_bytes_new_from_bytes(). Passing the same #GBytes instance multiple times potentially can result in duplicated data in the output stream.

For the synchronous, blocking version of this function, see g_output_stream_write_bytes().

bytes

The bytes to write

io_priority

the io priority of the request.

cancellable

optional #GCancellable object, None to ignore.

callback

a #GAsyncReadyCallback to call when the request is satisfied

fn write_bytes_future( &self, bytes: &Bytes, io_priority: Priority, ) -> Pin<Box_<dyn Future<Output = Result<isize, Error>> + 'static>>

Dyn Compatibility

This trait is not dyn compatible.

In older versions of Rust, dyn compatibility was called "object safety", so this trait is not object safe.

Implementors

impl<O: IsA<OutputStream>> OutputStreamExt for O