Re: [Boost-users] Multiple instance of options

Subject: Re: [Boost-users] Multiple instance of options
From: Ulf Samuelsson (boost-user_at_[hidden])
Date: 2013-09-20 05:48:03

On 2013-09-20 09:34, Kerry, Richard wrote:
>
> 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.
>
If I look at an xorg.conf file I find:

Section "Monitor"
     Identifier    "VG2021m"
     Option        "DPMS"
     HorizSync    28-65
     VertRefresh    57-63
         VendorName      "Viewsonic"
# More Options...
EndSection

Section "Monitor"
     Identifier    "SyncMaster-245B"
     Option        "DPMS"
         HorizSync    30-81
     VertRefresh    56-75
         VendorName      "Samsung"
# More Options
EndSection

so it is not impossible.
The "Identifier" allows you to differentiate between the two.

> 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).
>

Have not read all documentation yet, but don't I have to determine
at compile time which sections that can be in the ini file.

Regards,
Ulf

> Regards,
>
> Richard.
>
> *Richard Kerry*
>
> BNCS Engineer, SI SOL Telco & Media Vertical Practice
>
> T: [phone]
>
> M: [phone]
>
> G300, Stadium House, Wood Lane, London, W12 7TA
>
> richard.kerry_at_[hidden] 
> <https://webmail.siemens-it-solutions.com/owa/redir.aspx?C=9fb20d019e3e4cb99344d708709a3177&URL=mailto%3arichard.kerry%40atos.net>
>
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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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