Re: ???registrar(function_name)

[Andrew Johnson <anj@aps.anl.gov>]

Liyu, Andrei wrote:
> 	As I understand Application Developer's Guide 6.8 I can register
> function and call it from iocsh (ioc shell).
>
> 	Ok. I build IOC (windows, epics 3.14.7, MVC++.NET) from example
> template. Start it ... get
>
> ">epics"
> type "asSub" or "asSub()"
>
> and read
> "command asSub not found"
>
> What is wrong?

A registrar(function) entry in a DBD file does not automatically 
register a command with the IOC shell itself, it just arranges for the 
named function to be called during the IOC's startup process.  The 
registrar function can then perform any actions you wish to take place 
at that time, including registering new iocsh commands (for which you 
have to provide additional information in C code).

See the various files in the <base>/src/iocsh/ directory for examples of 
the command tables and the related call to iocshRegister() that you have 
to make to add a new command.  We really should have an example of how 
to do all this in the example template, but we don't appear to at present.

There is no fundamental reason why we can't provide a way to register 
commands by just adding them to a .dbd file and have them converted into 
the appropriate tables automatically, it's just that nobody has had time 
to write that code yet.

- Andrew
--
Podiabombastic: The tendency to shoot oneself in the foot.