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Function

Posted on 2000-04-03
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Last Modified: 2010-04-04
I am writeing a function that returns a boolean(true,false) and It doesnt seem to let me call a function from within the function, how can I do this?
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Question by:nafa2221
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6 Comments
 
LVL 17

Expert Comment

by:inthe
ID: 2681130
i havent tested this but it should work declare the functions globally so instead of calling
somefunction();
you can call
tform1.somefunction();

example:

  private
    function1(s : string);
    function2(t : tdatetime);  
    { Private declarations }
  public
    { Public declarations }
  end;

var
  Form1: TForm1;

implementation

{$R *.DFM}

function TForm1.function1(s : string);string;
begin
showmessage(s);
end;

function TForm1.function2(t:string);string;
begin
showmessage(t);
tform1.function2('here is function1 called in function2');
end;

if it dont work pates your 2 functions here  so we can look at.
0
 

Author Comment

by:nafa2221
ID: 2681170
MatchedWindow:=TForm1.FindWindowThatContainSubString(AOWindows,'Welcome'); <-- Thay gives me the error undeclared indentifier...help!
0
 
LVL 17

Expert Comment

by:inthe
ID: 2681223
erm please ignore above code it is gibberish(real bad)

here is a tested example of what i mean:
   
   
unit Unit1;

interface

uses
  Windows, Messages, SysUtils, Classes, Graphics, Controls, Forms, Dialogs,
  StdCtrls;

type
  TForm1 = class(TForm)
    Button1: TButton;
    procedure Button1Click(Sender: TObject);
  private
    { Private declarations }
    function function1(s : string):string;
    function function2(t : string):string;
  public
    { Public declarations }
  end;

var
  Form1: TForm1;

implementation

{$R *.DFM}

function TForm1.function1(s : string):string;
begin
showmessage(s);
end;

function TForm1.function2(t : string):string;
begin
showmessage(t);
function1('here is function1 in function2');
end;

procedure TForm1.Button1Click(Sender: TObject);
begin
Function2('function2');
end;

end.

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LVL 17

Expert Comment

by:inthe
ID: 2681241
oh i didnt see your posting.

what is this?

MatchedWindow:=TForm1.FindWindowThatContainSubString(AOWindows,'Welcome'); <-- Thay gives me the error undeclared indentifier...help!

that tells me nothing..
have you made this function yourself?
is it delared globally?
if so i would need see your full function to understand the error.
and show you where to put the code in your unit.
i presume your calling it on a button click or something ..?
please take a look at the second posting of mine and i think you will see what to do.


0
 
LVL 17

Accepted Solution

by:
inthe earned 50 total points
ID: 2681331
well i guess it is procedure your using not function but it is same principal..
 
this will work if you declare globally :
your procedure and a boolean var.

private
    { Private declarations }
procedure FindWindowThatContainSubString
  public
    { Public declarations }
  end;

var
  Form1: TForm1;
  MatchedWindow : Boolean;

implementation

procedure FindWindowThatContainSubString(blah,blah);
begin
blah blah
end;

procedure Tform1.Button1Click(sender : tobject);
begin
MatchedWindow:=FindWindowThatContainSubString(AOWindows,'Welcome');  
end;



0
 
LVL 17

Expert Comment

by:inthe
ID: 2681734
hi nafa,
having read some of your questions do you think this may help you:
i also use aol sometiomes so i could check the classnames to get this function.
mm.. i see your after the
"welcome , Barry" Window ..
what do you intend to do with this window when you have it?
maybe i can help more ..


unit Unit1;

interface

uses
  Windows, Messages, SysUtils, Classes, Graphics, Controls, Forms, Dialogs,
  StdCtrls;

type
  TForm1 = class(TForm)
    Button1: TButton;
    procedure Button1Click(Sender: TObject);
  private
    { Private declarations }
  public
    { Public declarations }
  end;

var
  Form1: TForm1;

implementation

{$R *.DFM}

Procedure FindAolWindow;
var
AolMainWnd,AolMdi,AolWelcomeWnd : hwnd;
s : array [0..255]of char;
begin
  AolMainWnd:= FindWindow('AOL Frame25',nil);
  if AolMainWnd <> 0 then begin
  AolMdi := FindWindowEx(AolMainWnd,0,'MDIClient',nil);
  if AolMdi <> 0 then begin
  AolWelcomeWnd  := FindWindowEx(AolMdi,0,'AOL Child',nil);
  if AolWelcomeWnd <>0 then
  begin
  getwindowtext(AolWelcomeWnd,s,255);
  if pos('Welcome',s) <> 0 then
    begin
  showmessage('Connected ')
    end
  else
   if pos('Goodbye',s) <> 0 then
     begin
  showmessage('Not Connected' );
    end
   else showmessage('Error..Aol running but Welcome/Goodbye Window not found');
   end;
 end;
 end
 else showmessage('Aol not running');
end;

procedure TForm1.Button1Click(Sender: TObject);
begin
 FindAolWindow;
end;

end.
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