Re: [Discuss-gnuradio] Set a command line parameter value from config file --OR-- override a "variable config" with a command line parameter

[Michael Matthews]

Thanks, Marcus. I tried embedding this logic in a custom "variable config" block, which exists only in XML, but saw no way to connect command-line options. So I tried a custom "parameter config" block based on parameter.xml but it seems that the GRC-to-Python converter recognizes only the ID "parameter" when it creates command options. So I just added it to the argument parser code post facto as follows. It's less preferred, but it works.

def argument_parser():
    import ConfigParser   
    config = ConfigParser.ConfigParser()
    config.read("config_file.conf")
    parser = OptionParser(option_class=eng_option, usage="%prog: [options]")
    parser.add_option(
        "-d", "--delay", dest="delay", type="eng_float", default=config.get("Parameters", "delay"),
        help="Set Delay [default=%default]")

On Sun, Jun 19, 2016 at 1:02 AM, Marcus Müller <address@hidden> wrote:

Idea to implement your alternative approach: Add a "Variable" block, which has the value

value_from_parameter if not value_from_parameter == default_value_for_that else value_from_config


Would that work for you?

On 06/19/2016 07:20 AM, Michael Matthews wrote:

The following seems like a fundamental run-time requirement, but I find no discussion in any GR forum or documentation:

1. A GR block references parameter "frequency", which is set by command line switch --freq defined in a "parameter" block.

2. In the absence of command line input --freq, I wish to set the parameter from config file similar to the "variable config" block.

Alternate approach:

1. A GR block references variable "frequency", which is set from config file via "variable config" block.

2. In the presence of command line input "--freq", I wish to override this variable.

I cannot use a "variable config" as a parameter default, nor can I use a command line parameter as a "variable config" default. What am I missing?

I use standard GR blocks, which I prefer not rewrite to handle config file input or multiple parameter/variable inputs.

Thank you,

-Mike

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