unit conversion using the API

[theedge456]

Hello,
I'm testing the API to do a basic conversion.
It seems not the correct way to proceed.
Any hint ?

 Calculator c;
 c.loadGlobalUnits();
Unit* uFrom=c.getUnit("meter");
 Unit* uTo=c.getCompositeUnit("r:mm_c"); // returns NULL
MathStructure ms = c.convert(10,uFrom, uTo);

[hanna-kn]

Remove r: from r:mm_c (letters before colon in data files specifies properties of name/symbol).

[hanna-kn]

A simpler and more flexible alternative to using getCombositeUnit() is to create a temporary unit, e.g. CompositeUnit uTo("", "", "", "mm")

Other alternatives include c.convert("10m", "mm") and c.calculate("10m->mm") (and related functions).

[theedge456]

Thanks for the hints.
But none seems to give the results.

MathStructure ms2=c.calculate("10m->mm");
PrintOptions po2;
std::cout<< ms2.print(po2); // shows: 10 m^-1 m*m
MathStructure ms1=c.convert("10m", "mm");
      PrintOptions po1;
      ms1.format(po1);
      std::cout<< ms1.print(po1); //  shows: 10 m

What is missing ?
Are there samples of code using the API somewhere ?

[hanna-kn]

Prefixes has not been loaded:
c.loadGlobalPrefixes();

loadGlobalDefinitions() is however preferable (a few units depend on variables).

c.convert("10m", "mm") should be c.convert(c.parse("10m"), "mm")

Are there samples of code using the API somewhere ?

No (not that I know of, except the code of the user interfaces). I generally recommend use of Calculator::calculateAndPrint() for simple input and output.

[theedge456]

Thanks for the tips.