Re: Octave/C++

[Mike Morley]

I've tried this code, but I'm still experiencing some problems:

- The line "rbc.opcode = args(1).int_value();" throws up an invalid 
conversion error

- I tried replacing the getlink line with "b->Bot.robot.command(rbc, 
args(2).intvalue());" (no ofcourse checking ags.length() = 3) but I get an 
invalid use error message. I did this replace placement because I don't 
understand how to implement the getlink command.

- I also tried putting in the robot.initialise() command in to initialise 
the robot link, but this produced errors wherever I seemed to put it.

- I get a "Bot3.cpp:80:1: warning: unknown escape sequence: '\040'" message 
appearing twice when I run mkoctfile.

Any help would as usual be appreciated, many thanks,

Mike.

On Jul 25 2005, Stefan van der Walt wrote:

> Hi Mike
>
> The function to access the robot could look something like (from the
> top of my head)
>
> DEFUN_DLD(robot_cmd, args, argv,
> "Send a cmd to the robot\n\
> \n\
> usage: robot_cmd(robot, cmd)")
> {
>   octave_value_list retval;
>
>   if (args.length() != 2) {
>     print_usage("robot");
>     return retval;
>   }
>
>   if (args(0).type_id() != Bot::static_type_id()) {
>     print_usage("robot");
>     return retval;
>   }
>
>   robot_command rbc;
>   rbc.opcode = args(1).int_value(); 
>
>   if (error_state) {
>     error("robot_cmd: expected integer command");
>     return retval;
>   }
>
>   Bot *b = (Bot*)args(0).internal_rep();
>   b->get_link() << rbc;
>
>   return retval;
> }
>
> You'll have to add the get_link() method to the Bot class.  Also, I
> didn't make provision for parameters above.
>
> Regards
> Stéfan
>
> On Mon, Jul 25, 2005 at 10:50:45AM +0100, Mike Morley wrote:
> > I tried the code you provided this morning linking to the header 
> > files, and it appears to work.
> > 
> > The problem I now have is how do I run commands to the robot?
> > 
> > I've looked at make_int.cc but I don't really understand the syntax I 
> > need to use to make things work.
> > 
> > Ideally, what I need is some way of issuing a command in octave like:
> > 
> > robotcommand (robot, motor1go, speed) that would run the C++ command 
> > robot.command (MOTOR_1_GO, speed)
> > 
> > So what I guess I need is some switch statement to convert the string 
> > into the appropriate robot command statement, and then pick up the 
> > other variable to pass to the robot. However, I'm not sure how to 
> > implement this.
> > 
> > Mike

--
--
Mike Morley
Trinity College, Cambridge
mjm80 | 07862 282608

Part II Experimental and Theoretical Physics
- Temporarily an Engineer -

Director of IT, Cambridge Union Society
www.cambridge-union.org




-------------------------------------------------------------
Octave is freely available under the terms of the GNU GPL.

Octave's home on the web:  http://www.octave.org
How to fund new projects:  http://www.octave.org/funding.html
Subscription information:  http://www.octave.org/archive.html
-------------------------------------------------------------