Reading from "low memory" -- sample code -- need guidance!

[Bill Skellenger]

It seems that the following code:

static void MyFunc()
{
        UInt16                  objIndex;
        FieldPtr                fldptrAmount;
        char                    *amount;

        frm = FrmGetActiveForm();
        
        // Get user's amount input
        objIndex = FrmGetObjectIndex(frm, fldAmount);
        fldptrAmount = FrmGetObjectPtr(frm, objIndex);
        FormatAmount(fldptrAmount, MaxDecimalPlaces);
        amount = FldGetTextPtr(fldptrAmount);
        ...
}

...is giving me a problem only in FormatAmount() if fldAmount doesn't
contain any data.  The first few lines are where POSE is telling me that
I'm reading from low memory:

static void FormatAmount (FieldPtr fld, UInt16 decimalPlaces)
{
        Int16 len;
        Char * str;
                
        str = FldGetTextPtr (fld);
        len = StrLen (str);
        if (!len) return;
        ...
}


But as I mentioned, if the field contains data, POSE executes this
normally.

I don't think it's a POSE problem, that's why I'm posting here -- I
think it's a general problem with the way I've coded this...

Thanks for any help in advance,

--Bill

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