gInputStreamReadAsync: gInputStreamReadAsync
Description
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 gInputStreamReadFinish to get the result of the
operation.Usage
gInputStreamReadAsync(object, count, io.priority = 0, cancellable = NULL, callback, user.data = NULL)
Arguments
count
the number of bytes that will be read from the stream
io.priority
the I/O priority
of the request.
callback
callback to call when the request is satisfied
user.data
the data to pass to callback function
Value
A list containing the following elements:
buffer- a buffer to read data into (which should be at least count bytes long).
Details
During an async request no other sync and async calls are allowed on stream, and will
result in G_IO_ERROR_PENDING errors.
A value of count larger than G_MAXSSIZE will cause a G_IO_ERROR_INVALID_ARGUMENT 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 asyncronous 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.