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It isn't impossible, just akward. I would try to find another way.
StrToNum will convert the number up to the first non-number, the
character + in your case. That is why you get 3 instead of 12.
3 + 4 + 5 is not a number and strToNum is not smart enough to add the
numbers. When it gets to the + it quits and returns 3.
To sum numbers in a string you have to parse the string to extract
the numbers. This will extract the numbers from the string and sum
them. The printf lines show what is being done along the way.
VarSetText("Condition1", "3 + 4 + 5");
aStr = VarGetText("Condition1");
a = aStr;
Offset = StrFind(aStr, "+") +1;
Len = StrLen(aStr);
b = StrMid(aStr, Offset, Len);
Offset = StrFind(b, "+") +1;
Len = StrLen(b);
d = StrMid(b, Offset, Len);
// this shows the output of the parser
// at this point a, b and d are strings, not numbers.
printf("a= " + a + ", b= " + b + ", d= " + d);
// strToNum returns the number up to first text character
x = StrToNum(a); // x = 3
y = StrToNum(b); // y = 4
z = StrToNum(d); // z = 5
// now you can sum the numbers
printf("\nTotal =" + NumToStr(x+y+z, 1));
Of course if you have an alphanumeric string, such as "Sum 3 plus 4
and then add 5.", the parsing it will get very difficult but it can
be done.
Barry
--- In amibroker@xxxxxxxxxxxxxxx, "ozzyapeman" <zoopfree@xxx> wrote:
>
> If it is just plain impossible to convert strings to actual values
> (other than plain numbers), perhaps my DLL plugin needs to spit
work in
> a different way?
>
> This is the type of thing I am trying to achieve - to cycle through
> thousands of conditions like:
>
> Condition1 = MA(C, 12) > C5 AND MA(C,20) < Close;
> Condition2 = EMA(L,4) > C3 OR MA(H,7) > Close;
> .
> .
> .
> Condition2555 = MA(H, 50) < C12 AND EMA(L, 12) < Close;
>
>
> Setting the left sides of the above expressions is easy, using
dynamic
> variables.
>
> But my DLL spits out the right sides of the above expressions, but
only
> as strings. So instead of the DLL returning strings, how else could
it
> interface with AmiBroker so that the dynamic assignments above are
> created in the AFL?
>
>
>
>
> --- In amibroker@xxxxxxxxxxxxxxx, "ozzyapeman" <zoopfree@> wrote:
> >
> > Or to take a more trivial example, the following prints "3"
instead of
> > "12":
> >
> > VarSetText("Condition1", "3 + 4 + 5");
> >
> > Total = StrToNum (VarGetText("Condition1"));
> >
> > printf ("Sum %g", Total);
> >
> > How do I convert the above string so that Total is equal to the
> > expression itself, which is equal to 12?
> >
> >
> > --- In amibroker@xxxxxxxxxxxxxxx, "ozzyapeman" zoopfree@ wrote:
> > >
> > > Yes, tried that. But since the values spit out by the function
> aren't
> > > just pure numbers, it does not seem to work.
> > >
> >
>
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