CFD Online Discussion Forums

CFD Online Discussion Forums (http://www.cfd-online.com/Forums/)
-   OpenFOAM (http://www.cfd-online.com/Forums/openfoam/)
-   -   programming issue (http://www.cfd-online.com/Forums/openfoam/66857-programming-issue.html)

Schag July 27, 2009 04:51

[Solve]programming issue
 
Hi,

I think it's quite trivial, but I spent time on finding how to get a float as argument for an application.

It's a little application dealing with boundary conditions, let's name it JulienFoam

I want to be able to use it as:
JulienFoam <Boundary> -numericalarg <float>

for the moment, I have that:

int main(int argc, char *argv[])
{
float numericalarg;
argList::validArgs.append("patchName");
argList::validOptions.insert("numericalarg",numeri calarg);

word patchName(args.args()[1]);

[...]

}

and I don't find how to get my numericalarg as a float, it seems that argList only gets strings.

If someone can give me any piece of advice, I think it would be very usefull for my future using, not just for that program.

Regards

Julien

henrik July 27, 2009 05:01

Julien,

yes, arguments are passed only as strings.

Have a look into fluentMeshToFoam.L where it says:
Code:

    scalar scaleFactor = 1.0;
    if (args.options().found("scale"))
    {
        scaleFactor = atof(args.options()["scale"].c_str());
    }

Henrik

Schag July 27, 2009 05:27

Perfect, that is exactly what I was looking for! I looked over other applications but not that one.

Thanks a lot!

olesen July 28, 2009 02:31

Just for completeness (to followup on what Henrik mentioned), you might note that readScalar operates on an Istream, and IStringStream can be used to create an Istream from a string.
Thus the following would also work:
Code:

if (args.options().found("scale"))
{
    scaleFactor = readScalar(IStringStream(args.options()["scale"])());
}

The extra '()' on the IStringStream constructor casts away constness.

Of course, both solutions look fairly messy.

olesen July 28, 2009 02:40

In OpenFOAM-1.6, the same thing becomes much more convenient:
Code:

    scalar scaleFactor = 1.0;
    args.optionReadIfPresent("scale", scaleFactor);



All times are GMT -4. The time now is 11:55.