Re: [Boost-users] Multiple instance of options

Subject: Re: [Boost-users] Multiple instance of options
From: Kerry, Richard (richard.kerry_at_[hidden])
Date: 2013-09-20 03:34:48

I don't think that can work.

Although I use Windows functions (GetPrivateProfileString etc) to do this I've had a quick look at the Boost documentation and it looks like what I'm about to say is the same for Boost's handing of property maps and ini files.

You can't duplicate the [sensor] section as you then have no way of selecting which one you want.

The functions take section name and key name and return a value, so if a section name is duplicated the system doesn't know which section you want.

Should sensor.SensorName return "Outdoor Temp" or "Indoor Temp" ?

In similar cases we do it like this :

[sensor_1]
...
[sensor_2]
...
[sensor_3]
...

This means you've got unique section names.

"you get a hard limit"

Why do you think that ?

Either hold a separate value for the number of sensors, or attempt to read in order and stop when one is missing (this adds a rule that the ones you're using must be consecutive).

Regards,

Richard.

Richard Kerry
BNCS Engineer, SI SOL Telco & Media Vertical Practice
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________________________________
From: Boost-users [boost-users-bounces_at_[hidden]] on behalf of Ulf Samuelsson [boost-user_at_[hidden]]
Sent: 18 September 2013 17:28
To: boost-users_at_[hidden]
Subject: [Boost-users] Multiple instance of options

Need to parse an "ini" file which configures one or more sensors.

The sensors can be of the same type and are identified by
"name", "type" and an "id"

Some configuration items are for all sensors
Other configuration tiems are only for some sensors.

[sensor]
     SensorName="Outdoor Temp"
     SensorType=1    # Temp Sensor
     SensorID=1000
     SerialNumber="12344"
     Active=1
     Device="/dev/ttyUSB01"

[sensor]
     SensorName="Indoor Temp"
     SensorType=1    # Temp Sensor
     SensorID=1001
     SerialNumber="12345"
     Active=1
     Device="/dev/USB02"

[sensor]
     SensorName="Light"
     SensorType=2    # Light Sensor
     SensorID=1002
     SerialNumber="12349"
     Active=1
     Device="/dev/ttyUSB02"
     MaxLumen="500"

Is having multiple identical section names possible with boost program
options?

It is of course possible to do

[sensor_1]
...
[sensor_2]
...
[sensor_3]
...

but that is not so nice looking,
and you get a hard limit on the number
of sensors you can attach.

Ideas?

BR
Ulf Samuelsson

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