The asynchronous version of g_data_input_stream_read_upto().
It is an error to have two outstanding calls to this function.
In contrast to g_data_input_stream_read_until(), this function
does not consume the stop character. You have
to use g_data_input_stream_read_byte() to get it before calling
g_data_input_stream_read_upto() again.
Note that stop_chars may contain '\0' if stop_chars_len is
specified.
When the operation is finished, callback will be called. You
can then call g_data_input_stream_read_upto_finish() to get
the result of the operation.
Since 2.24
The asynchronous version of g_data_input_stream_read_upto(). It is an error to have two outstanding calls to this function. In contrast to g_data_input_stream_read_until(), this function does not consume the stop character. You have to use g_data_input_stream_read_byte() to get it before calling g_data_input_stream_read_upto() again. Note that stop_chars may contain '\0' if stop_chars_len is specified. When the operation is finished, callback will be called. You can then call g_data_input_stream_read_upto_finish() to get the result of the operation. Since 2.24