[Lazarus] Adds Gauge component on Lazarus

[Mark Morgan Lloyd]

Sven Barth wrote:
> On 28.07.2012 00:43, Mark Morgan Lloyd wrote:
>> Do that and I'll contribute my SNMP MIB to Pascal compiler :-) Although
>> SNMP's usage of "gauge" is obviously a bit odd.
> 
> You have a SNMP MIP to Pascal compiler? This is such a good timing then, 
> because I'll need that in a couple of weeks for a monitoring project at 
> the university :)

You're welcome to it, but here's the health warning :-)

What I've done is relied on an MIB being run through smidump and stored 
as a file. Provided that that works, I run that file through a recursive 
descent parser (circa 1964 vintage :-) and eventually output a class 
definition for each described object. All descriptive text etc. is 
preserved and I've been careful with formatting, output files can get 
big (>500Kb for RFC1213_MIB.pas).

What I've not done is the final stage where objects are instantiated 
with an IP address etc., including code to interface to e.g. Synapse. I 
couldn't work out how best to do that, ideally it wouldn't rely on any 
more processing stages, and something else cropped up.

What I should have done was work directly from the data structures built 
up by the sming (?) library, but I couldn't get my head round how they 
were representing things and working from a human-readable file was easier.

What I wanted to do was to be able to instantiate e.g. a router as a 
graphical component contained in a DLL, so that each DLL could have its 
own mix of classes; ultimately, something like a tailored Lazarus for 
building NMSes. However that's moving outside my abilities.

/If/ it turned out there was money to be made out of it we could use 
some :-)

-- 
Mark Morgan Lloyd
markMLl .AT. telemetry.co .DOT. uk

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