I use Delphi RAD Studio 2010 and DecimalRounding_JH1.pas from http://cc.embarcadero.com/item/21909.
It works good, but I don't know why, in some old machines (Pentium IV with Windows XP SP3), the round fails after access to printer.printerindex. I have checked that the problem not is Windows XP due it works in other machines with this OS.
I have made a simple project that round an extended value with DecimalRounding_JH1 (drHalfUp) with two decimals (1.105 -> rounds to 1.11). But If I read printer.printerindex, then 1.105 rounds to 1.10).
I thought it could be the "FDIV bug", but compiling with "FDIV safe" doesn't resolve the problem.
The code:
var d1,d2:extended;
i:integer;
begin
d1:=1.105;
d2:=DecimalRounding_JH1.DecimalRoundExt(d1,2,drHalfUp);
memo1.lines.add(FloatToStr(d2)); // --> shows 1.11 (OK)
i:=Printer.printerindex;
d2:=DecimalRounding_JH1.DecimalRoundExt(d1,2,drHalfUp);
memo1.lines.add(FloatToStr(d2)); // --> shows 1.10 (ERROR!!!)
...
I know that it is very strange, but I've tested it and It's as I said.
What could I do?
Edited:
If I add Printer.printerindex:=1;
(for example) before i:=Printer.printerindex;
then again it works good. Reading printer unit, the difference is about execute "SetToDefaultPrinter" or not:
function TPrinter.GetPrinterIndex: Integer;
begin
if FPrinterIndex = -1 then SetToDefaultPrinter;
Result := FPrinterIndex;
end;
thanks in advance.