On Mon, Dec 17, 2012 at 4:18 PM, Bert Willaert
<bert [dot] willaert [..] ...> wrote:
> Hi,
>
> I am having the following problem when creating a LuaComponent. I add two
> properties of type integer (lua "int" - cpf "long") and I want to
> immediately update their values with updateProperties("file.cpf"). However,
> I get:
>
> 0.091 [ ERROR ][PropertyLoader:configure] Could not compose unknown type
> 'float64[]'.
> 0.091 [ ERROR ][PropertyLoader:configure] Could not compose unknown type
> 'float64[]'.
> 0.091 [ ERROR ][PropertyLoader:configure] Could not compose unknown type
> 'float64[]'.
>
> UpdateProperties returns false and the two integers properties are not
> updated.
>
> The cpf file contains also three arrays ( lua "array" - cpf "float64[]").
> The corresponding properties are created only later on and updating of these
> properties, also later on, poses no problem. The latter proves(?) that there
> is nothing wrong with the syntax of the cpf file.

The error is not saying that the arrays are missing, the error is
saying that RTT
doesn't know the float64[] type, at that point of your deployment. Change your
.cpf data type to "array" as well.

>
> UpdateProperties is only supposed to change what it can change, so why do I
> get this error?

It does bail out because before updating the properties, it first recreates the
C++ structs out of the XML file ('composition'). Only after that, the
update step
is done. Another implementation could have made a different choice, that's true.
Your fix is to make sure that the float64[] type from ROS is known at
that moment,
or to edit your .cpf file.

>
> I am using 2.5 taken from the git server about 2 weeks ago.

This could also be solved in 2.6 since there we resolved all these
type name issues
and installed proper name aliasing. So RTT will recognise that
float64[] == array == /std/vector<double>.

Peter