Originally created by: patrick van ieperen

Hello,
I am trying to make a hardware abstraction layer by using interfaces.

It's working out fine, but is it possible to create a instance of a class / function block during runtime.

In Java and C# i will do like :

Motorcontroller mc = new Motorcontroller();

    mc.setMotorType(new ServoMotor());
    System.out.println(mc.getMotorType());

    mc.setMotorType(new StepperMotor());
    System.out.println(mc.getMotorType());

    mc.setMotorType(new DcMotor());
    System.out.println(mc.getMotorType());

Is there a way to use the "new command" in Codesys?

regards Patrick

Hello,
you can use __NEW() and __DELETE() if your runtime system supports that.
Check the online help for more information.

Originally created by: patrick van ieperen

Hello Singleton,

thanks for your quick reply.

if i make a pointer to my intrerface Imotor.
and then try to assign fb_StepperMotor, this class implements Imotor, i will get an error.

"cannot convert type POINTER TO fb_stepperMotor to type POINTER TO Imotor

main program:
PROGRAM main
VAR
ptrITF : POINTER TO Imotor;
fbSub : fbMain;
bInit: BOOL := TRUE;
strNaam : STRING;
END_VAR

fbSub();

IF (bInit) THEN
ptrITF := __NEW(fb_StepperMotor);
fbSub.setDynamic(ptr:=ptrITF);
strNaam := fbSub.getName;
bInit := FALSE;
END_IF

while in Java i use :
public class Motorcontroller
{
ImotorControl mc;

public Motorcontroller()
{
}
public void setMotorType(ImotorControl imc)
{
    this.mc = imc;
}

Regards Patrick