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problem with exchanging data between 2 forms

Posted on 1999-01-24
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Last Modified: 2010-04-06

Hi experts,

I have a problem if I want to exchange data between 2 forms.

My application consits of 2 forms:

form1:
------

drivelistbox,directorylistbox,filelistbox, filterlistbox
commandbutton


form2:
------

3 editboxes, 1 commandbutton


If I press the button of form1, I read the selected name of the selected textfile to a string variable.

Now I open the file and want to copy the lines within the textfile to the editboxes of form2.
And this copying is not so easy for me.

I can't assign this copying to the button of form1, because in form1 the editboxes of form2 are unknown.
And if I assign this copying to the comandbutton of form2, the editboxes are known, but now the selected
filename will be an unknown identifier for Delphi.

I have one idea in my mind.

In form1 I could try something like

form2.edit1.text:'bla bla bla';

BUT; I want to manipulate the editboxes of form2 with the help of this routines:

function SplitStrAt(var s: string; position: Integer): string;
var
  i, mark: Integer;
begin
  mark := 0;

  for i := 1 to Length(s) do begin
    if (s[i] in delimiters) or (i = length(s)) then mark := i;
    if (i >= position) or (i = Length(s)) then begin
      Result := Copy(s, 1, mark);
      Delete(s, 1, Mark);
      break;
    end;
  end;
end;


procedure TForm1.Button1Click(Sender: TObject);
var
  s: string;
  i: integer;
begin
  s := 'This is a sample string which should be examined by the experts' +
    'in order to demonstrate which result I want if I split a string.';
  while s <> '' do
    for i := 0 to ComponentCount - 1 do
      if (Components[i] is TEdit) then
        TEdit(Components[i]).Text := SplitStrAt(s, 50);
end;

But the code of

procedure TForm1.Button1Click(Sender: TObject);

works only if both file selection and string manipulation are done within only one form.
As the form with the editboxes is already filled with other stuff, I have to avoid this
overloading and Imust use 2different forms.

Have you an idea, how my problem could be solved ?





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Question by:mathes
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2 Comments
 
LVL 1

Accepted Solution

by:
martin_g earned 80 total points
ID: 1363127
The first simple thing that you'll wnat to check is the "uses" section of your forms.  On the Form1 unit in the "uses" clause just below interface, place a reference to the unit containing your Form2. Now in the Form2 unit, place a uses clause  immediately below the implementation clause referring back to your form 1 unit.

Having donw this both units should reconize each other.  Than to exchange data you simply do this:

Form2.edit1.text := Form1.edit1.text;

Or in your Button1Click
procedure TForm1.Button1Click(Sender: TObject);
var
  s: string;
  i: integer;
begin
  s := 'This is a sample string which should be examined by the experts' +
    'in order to demonstrate which result I want if I split a string.';
  while s <> '' do
    for i := 0 to Form2.ComponentCount - 1 do
      if (Form2.Components[i] is TEdit) then
        TEdit(Form2.Components[i]).Text := SplitStrAt(s, 50);
end;

Hope this helps!
Martin Gauss

0
 

Author Comment

by:mathes
ID: 1363128
Hi expert,

thank you for your help.

This is exactly what I was looking for.


With kind regards

Mathes

0

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