Trait gio::prelude::InputStreamExtManual[−][src]

pub trait InputStreamExtManual: Sized {
    fn read<B: AsMut<[u8]>, C: IsA<Cancellable>>(
        &self, 
        buffer: B, 
        cancellable: Option<&C>
    ) -> Result<usize, Error>;

    fn read_all<B: AsMut<[u8]>, C: IsA<Cancellable>>(
        &self, 
        buffer: B, 
        cancellable: Option<&C>
    ) -> Result<(usize, Option<Error>), Error>;

    fn read_all_async<B: AsMut<[u8]> + Send + 'static, Q: FnOnce(Result<(B, usize, Option<Error>), (B, Error)>) + Send + 'static, C: IsA<Cancellable>>(
        &self, 
        buffer: B, 
        io_priority: Priority, 
        cancellable: Option<&C>, 
        callback: Q
    );

    fn read_async<B: AsMut<[u8]> + Send + 'static, Q: FnOnce(Result<(B, usize), (B, Error)>) + Send + 'static, C: IsA<Cancellable>>(
        &self, 
        buffer: B, 
        io_priority: Priority, 
        cancellable: Option<&C>, 
        callback: Q
    );

    fn read_all_async_future<B: AsMut<[u8]> + Send + 'static>(
        &self, 
        buffer: B, 
        io_priority: Priority
    ) -> Pin<Box<dyn Future<Output = Result<(B, usize, Option<Error>), (B, Error)>> + 'static>>;

    fn read_async_future<B: AsMut<[u8]> + Send + 'static>(
        &self, 
        buffer: B, 
        io_priority: Priority
    ) -> Pin<Box<dyn Future<Output = Result<(B, usize), (B, Error)>> + 'static>>;

    fn into_read(self) -> InputStreamRead<Self>ⓘ
Notable traits for InputStreamRead<T>
impl<T: IsA<InputStream>> Read for InputStreamRead<T>

    where
        Self: IsA<InputStream>,
    { ... }

    fn into_async_buf_read(
        self, 
        buffer_size: usize
    ) -> InputStreamAsyncBufRead<Self>
    where
        Self: IsA<InputStream>,
    { ... }
}

Required methods

Tries to read count bytes from the stream into the buffer starting at buffer. Will block during this read.

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

On success, the number of bytes read into the buffer is returned. It is not an error if this is not the same as the requested size, as it can happen e.g. near the end of a file. Zero is returned on end of file (or if count is zero), but never otherwise.

The returned buffer is not a nul-terminated string, it can contain nul bytes at any position, and this function doesn’t nul-terminate the buffer.

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.

cancellable

optional Cancellable object, None to ignore.

Returns

Number of bytes read, or -1 on error, or 0 on end of file.

buffer

a buffer to read data into (which should be at least count bytes long).

Tries to read count bytes from the stream into the buffer starting at buffer. Will block during this read.

This function is similar to InputStreamExtManual::read(), except it tries to read as many bytes as requested, only stopping on an error or end of stream.

On a successful read of count bytes, or if we reached the end of the stream, true is returned, and bytes_read is set to the number of bytes read into buffer.

If there is an error during the operation false is returned and error is set to indicate the error status.

As a special exception to the normal conventions for functions that use glib::Error, if this function returns false (and sets error) then bytes_read will be set to the number of bytes that were successfully read before the error was encountered. This functionality is only available from C. If you need it from another language then you must write your own loop around InputStreamExtManual::read().

cancellable

optional Cancellable object, None to ignore.

Returns

true on success, false if there was an error

buffer

a buffer to read data into (which should be at least count bytes long).

bytes_read

location to store the number of bytes that was read from the stream

Request an asynchronous read of count bytes from the stream into the buffer starting at buffer.

This is the asynchronous equivalent of InputStreamExtManual::read_all().

Call g_input_stream_read_all_finish() to collect the result.

Any outstanding I/O request with higher priority (lower numerical value) will be executed before an outstanding request with lower priority. Default priority is G_PRIORITY_DEFAULT.

io_priority

the [I/O priority][io-priority] of the request

cancellable

optional Cancellable object, None to ignore

callback

callback to call when the request is satisfied

Returns

buffer

a buffer to read data into (which should be at least count bytes long)

Request an asynchronous read of count bytes from the stream into the buffer starting at buffer. When the operation is finished callback will be called. You can then call g_input_stream_read_finish() to get the result of the operation.

During an async request no other sync and async calls are allowed on self, and will result in IOErrorEnum::Pending errors.

A value of count larger than G_MAXSSIZE will cause a IOErrorEnum::InvalidArgument error.

On success, the number of bytes read into the buffer will be passed to the callback. It is not an error if this is not the same as the requested size, as it can happen e.g. near the end of a file, but generally we try to read as many bytes as requested. Zero is returned on end of file (or if count is zero), but never otherwise.

Any outstanding i/o request with higher priority (lower numerical value) will be executed before an outstanding request with lower priority. Default priority is G_PRIORITY_DEFAULT.

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 [I/O priority][io-priority] of the request.

cancellable

optional Cancellable object, None to ignore.

callback

callback to call when the request is satisfied

Returns

buffer

a buffer to read data into (which should be at least count bytes long).

Provided methods

Implementors