[zhajingjing]

Hello everyone,

In a small post-processing program, I have to convert a string into a scalar:

int main(int argc, char *argv[])
{
    timeSelector::addOptions();
    argList::validArgs.append("fieldName"); 
    argList::validArgs.append("xValue");
#   include "setRootCase.H"
#   include "createTime.H"
    instantList timeDirs = timeSelector::select0(runTime, args);
#   include "createMesh.H"

    word fieldName(args.additionalArgs()[0]);
   word xValue(args.additionalArgs()[1]);
    
    Info <<xValue<<endl;
    
    ......     // ?
   scalar   x=       //   get the value from xValue, but xValue is a string---How???

Thanks for any help!

[l_r_mcglashan]

You could use 'strtod' from the cstdlib.

http://www.cplusplus.com/reference/c...stdlib/strtod/

[zhajingjing]

I add the following,It worked.Thank you very much.

 #include <cstdlib>
...
   char* pEnd;
   scalar x=strtod(xValue.c_str(),&pEnd);

[Rudiy]

Hello, i got a similar problem.

I am trying to read from values from the thermophysical properties file.

Here is my code:
const fvMesh &PoP99 = V_.db().parent().objectRegistry::lookupObject<fvMe sh>(region2);
const dictionary t1 = PoP99.thisDb().lookupObject<IOdictionary>("thermop hysicalProperties");

const dictionary t2(t1.subDict("mixture"));
const dictionary transpks(t2.subDict("transport"));
const auto sigmaLayer = transpks.lookup("sigmaL");
const auto st = sigmaLayer[0];

double q = 10.0;




Info << st*q <<endl;

obviously this dosent work because st has the datatype Foam::token amd q double.

is there a way to convert from Foam::token to double?

[olesen]

Originally Posted by Rudiy

Hello, i got a similar problem.

I am trying to read from values from the thermophysical properties file.

Here is my code:
const fvMesh &PoP99 = V_.db().parent().objectRegistry::lookupObject<fvMe sh>(region2);
const dictionary t1 = PoP99.thisDb().lookupObject<IOdictionary>("thermop hysicalProperties");

const dictionary t2(t1.subDict("mixture"));
const dictionary transpks(t2.subDict("transport"));
const auto sigmaLayer = transpks.lookup("sigmaL");
const auto st = sigmaLayer[0];

double q = 10.0;


Info << st*q <<endl;

obviously this dosent work because st has the datatype Foam::token amd q double.

is there a way to convert from Foam::token to double?

Not really sure what your "sigmaL" represents. At the moment it simply represents a copy of a tokenList (which is the ITstream that the lookup method returns). If we assume that "sigmaL" is actually supposed to be a list of scalars I would write it like this:

const fvMesh &PoP99 = V_.db().parent().objectRegistry::lookupObject<fvMe  sh>(region2);
  const dictionary& t1 = PoP99.thisDb().lookupObject<IOdictionary>("thermop  hysicalProperties");

  const dictionary& t2 = t1.subDict("mixture");
  const dictionary& transpks = t2.subDict("transport");
  const scalarList sigmaLayer = transpks.get<scalarList>("sigmaL");
  const scalar st = sigmaLayer[0];

Note that this also avoids making copies of the dictionaries like your original code did.

[Rudiy]

Hello,

Thanks for your code, i manged to get it to work with a similar version.
.get... did not work for me. I used this insted:

scalar sigmaLayer (readScalar(transpks.lookup("sigmaL")));

thanks for the help

[olesen]

Originally Posted by Rudiy

Hello,

Thanks for your code, i manged to get it to work with a similar version.
.get... did not work for me. I used this insted:

scalar sigmaLayer (readScalar(transpks.lookup("sigmaL")));

thanks for the help

Glad you have it working. If you get a newer version, the dictionary get method is preferred since it will also check if there were any trailing tokens.

[Rudiy]

ok good to know, thaks for the advice.

Unfortunately the get() function didnt work. The code compiled without any errors, but when i run the openFoam case i get the following Error:

--> FOAM FATAL IO ERROR: (openfoam-2212)
attempt to read beyond EOF

file: constant/solidR/thermophysicalProperties.electricalProperties.elek transport.sigmaL at line 60.

From virtual Foam::Istream& Foam::ITstream::read(Foam::token&)
in file db/IOstreams/Tstreams/ITstream.C at line 450.

FOAM exiting