[Discuss-gnuradio] A little help with this please......urgent

[Mir Ali]

Hi,
I am mailing this question again because, I didn't get enough help last time. :-)

My intention here is very different from what gr.file_source() does, so please take a look at my explanation. 
I want to read a byte from a file and then put it on an input stream to a block. If you look at the following code below you will know that I do not want to open a stream from the file to the input of another block. I just want to read a byte of data and then put it on an input stream.  

tb.start()
    fil=open("/home/murtuza/t",'r')     # I first open a file to read

    n=0   
    while n<1:
        data = "" # then read one byte only
        n=n+1
        send_pkt(data) # then send it over the stream to a block that processes that byte.
        # after this we read the next byte and then send the data to the input stream.
   
    tb.wait()

If you look at benchmark_tx.py program data is read from a file and then send_pkt() is called. send_pkt() module in transmit_path.py calls "self.packet_transmitter.send_pkt(payload, eof)" which then calls send_pkt() in mod_pkts. Here, the payload is inserted into the message queue by the statement self._pkt_input.msgq().insert_tail(msg). I want to do something similar except for the fact that I want to put the unmodified byte in the queue unlike mod_pkts which first uses message_from_string and then inserts the msg on to the queue.

If this can be done using file_source then can u tell how?

I am working on something that requires me to do this. May be this is not an ideal way of doing it but still I want to know if it is possible.
 
Thanks,

Ali