On Fri, Mar 13, 2009 at 01:49:31PM +0100, Martin Braun wrote:
> Hi,
>
> following
> http://lists.gnu.org/archive/html/discuss-gnuradio/2009-02/msg00400.html,
> I tried connecting two processes with a FIFO using gr.file_descriptor_*.
>
> However, I can't seem to pass the file descriptor from the Python to the
> C++ domain. This is the error message I get:
>
> gr_file_descriptor_sink: Bad file descriptor
>
> This is the code (pipe1 was created by using 'mkfifo pipe1'):
The python file object, fid, is going out of scope, and thus the
underlying file is being closed. Try self.fid = open(...)
Eric
> Source-File:
>
> <<< SNIP >>>
> from gnuradio import gr
> class sig_source(gr.top_block):
> def __init__(self):
> gr.top_block.__init__(self)
>
> src = gr.sig_source_f(8000, gr.GR_SIN_WAVE, 2000, 1.0)
> head = gr.head(gr.sizeof_float, 8000)
>
> print "Opening pipe..."
> fid = open('pipe1', 'wb')
> print "Done. fileno: ", fid.fileno()
> sink = gr.file_descriptor_sink(gr.sizeof_float, fid.fileno())
>
> self.connect(src, head, sink)
>
> if __name__ == '__main__':
> try:
> sig_source().run()
> except KeyboardInterrupt:
> pass
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