[Discuss-gnuradio] Fwd: Write a source block in python

[Thanasis Balafoutis]

Hi

I wrote a simple source block that reads a string (as a parameter) and outputs the corresponding array of bytes.

Here is the code:

class myblock(gr.sync_block):

    def __init__(self, helloMsg):
        gr.sync_block.__init__(self,
            name="myblock",
            in_sig=None,
            out_sig=[numpy.byte])
        self.helloMsg = helloMsg

    def work(self, input_items, output_items):
        out = output_items[0]
       
        test = array.array('B',self.helloMsg)
        for j in range(len(test)):
           out[j] = test[j]
        return len(output_items[0][:len(test)])

In the output I repeatedly get the helloMsg. (it seems that the work() function is always running)

Is it possible to get in the output my helloMsg only one time (or a specific amount of times) and then stop the execution of the flowgraph?

Thank you in advance!

Thanasis