Tries to write count bytes from buffer into the stream. Will block during the operation.
This function is similar to OutputStream.write, except it tries to write as many bytes as requested, only stopping on an error.
On a successful write of count bytes, TRUE is returned, and bytes_written is set to count.
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 GError, if this function returns FALSE (and sets error) then bytes_written will be set to the number of bytes that were successfully written 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 OutputStream.write.
the buffer containing the data to write.
location to store the number of bytes that was written to the stream
optional gio.Cancellable object, NULL to ignore.
TRUE on success, FALSE if there was an error
GException on failure.