Josh & others： Thanks for your help, I am just use the first way under your mentioned, means I modified a generated py file, and I use start function instead run(ture) function in the last line. But, after this job,the items added in GRC before is not displayed anymore.(I used a slider item to control the freq, after change run() to start() in the last line, the slider is missing while executing)
2009/9/5 Josh Blum <[email protected]> > In the wx gui code (generated by grc), the last line in the py file is > tb.Run(True). This effectively calls start() on the flow graph and blocks in > the wx main loop: > > ---from top_block_gui.py--- > #start flow graph > if start: self.start() > #blocking main loop > self._app.MainLoop() > > For a wxgui app, you have to block in MainLoop(). However.... > > A) One option is to make your own threading.Thread class and pass it an > instance of your top block. Your thread will run in the background while the > main thread blocks at MainLoop(). > > B) An even better idea would be to make your own grc block wrapper that > will invoke this thread. You dont need to have an actual gnuradio block in > this xml wrapper, any python code is possible. A great example is the xmlrpc > server block: > http://gnuradio.org/trac/browser/gnuradio/trunk/grc/blocks/xmlrpc_server.xml > > With option *A*: this would require modifications to a generated py file. > If you generate the file again, you have to re-do the modifications. > > However, with option *B*: grc can generate the py file with your thread + > custom logic. All the information is captured in the saved grc file, so you > do not need to modify the "output py file". > > -Josh > > > nansai hu wrote: > >> So that is the reason for use .run() the gui will display if you py file >> is >> modified by a grc file, but if use the .start() function, no gui display >> even in same program? >> >> if it is ture,how can I add some logic after the program started? >> I mean if I use start() function ,the code after start() could be executed >> (use run function these code could not be executed),but the GUI silde or >> ratiobottom item which add to file by GRC previously could not be >> displayed? >> >> Is there anyway to have both GUI item and some logic after program could >> be >> available in same time? >> >> 2009/9/5 Josh Blum <[email protected]> >> >> run() is a blocking call. >>> start() is a non-blocking call. >>> >>> Also, I believe run() will exit when a block returns -1 in its work >>> method. >>> FYI >>> >>> -Josh >>> >>> nansai hu wrote: >>> >>> When run a python script file, as we know main function will be run >>>> first. >>>> We send the class to a object "tb",for instance. Then we have two ways >>>> to >>>> let the program run. >>>> One is call tb.run() function,and other is call tb.start() >>>> function.Could >>>> somebody told me the difference bewteen these? >>>> >>>> In my coding experience, use .run() the gui will display if you py file >>>> is >>>> modified by a grc file, but if use the .start() function, no gui display >>>> even in same program. >>>> >>>> >>>> >>>> ------------------------------------------------------------------------ >>>> >>>> _______________________________________________ >>>> Discuss-gnuradio mailing list >>>> [email protected] >>>> http://lists.gnu.org/mailman/listinfo/discuss-gnuradio >>>> >>>> >>
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