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Michael Brown
Guest
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 Posted: Fri Aug 29, 2003 10:18 am Post subject: Re: Function scope and acting on variables |
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"Dean" <dean[no-spam]@weany.com> wrote
| Quote: | Hi,
I'm getting myself a little confused with a function call I'm trying to
build.
I need a function that returns a bool result and is capable of acting on
"S", a string, which is defined as a variable under the If.....then
procedure (not the function). i.e. the whole thing looks kind of like this
(I've cut straight down to the relevant bits):-
procedure TForm1.IncomingPacket;
S : String; <----- variable "S" is under this procedures scope
begin
If ReadStringFromPacket(S) then StringList.Add(S) else exit;
end;
function ReadStringFromPacket(Str : String) : Bool;
begin
//just testing
Str := "test";
Result := false;
end;
OK, now this doesn't work, as "S" is still left as ''. Question is, do I
have to set S as a global variable and always use that global variable
within whatever string functions I need, or is there a neater way of
linking
the calling procedures variable scope to the receiving functions scope?
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Just define "str" to be a var parameter:
function ReadStringFromPacket(var Str : String) : Bool;
--
Michael Brown
www.emboss.co.nz : OOS/RSI software and more 
Add michael@ to emboss.co.nz - My inbox is always open
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