I'm creating a text editor that using a MDIChild for the edit box.
So I can create many child window from the main window. I also create a program that process an active child window. But when I run the program, every child window that I create is getting process all together.
I want to know how to tell which is the child window that currently active among the other child window, and tell the program to work only for that child window?

: I'm creating a text editor that using a MDIChild for the edit box.
: So I can create many child window from the main window. I also create a program that process an active child window. But when I run the program, every child window that I create is getting process all together.
: I want to know how to tell which is the child window that currently active among the other child window, and tell the program to work only for that child window?
:
THat's stored in the mainform's ActiveMDIChild property.

: THat's stored in the mainform's ActiveMDIChild property.
:
I'm sorry.... but can you tell me what is the command to tell the program to process only the Active child window?

: : THat's stored in the mainform's ActiveMDIChild property.
: :
: I'm sorry.... but can you tell me what is the command to tell the program to process only the Active child window?
:
This sample code will save to text in the active child (providing the memo on the active child is called Memo1):

  ActiveMDIChild.Memo1.Lines.SaveToFile('SomeFile.txt');

: This sample code will save to text in the active child (providing the memo on the active child is called Memo1):
:

:   ActiveMDIChild.Memo1.Lines.SaveToFile('SomeFile.txt');
: 

:
I try it, and the program keep saying that Memo1 is unknown, eventhough my active child have Memo1 in it.

: : This sample code will save to text in the active child (providing the memo on the active child is called Memo1):
: :

: :   ActiveMDIChild.Memo1.Lines.SaveToFile('SomeFile.txt');
: : 

: :
: I try it, and the program keep saying that Memo1 is unknown, eventhough my active child have Memo1 in it.
:
I'm sorry. I completely forgot that you need to type-cast the ActiveMDIChild. Here is the way to type-cast the ActiveMDIChild:

  (ActiveMDIChild as TForm2).Memo1.Lines.SaveToFile('SomeFile.txt');

if the children are of the TForm2 type.

: I'm sorry. I completely forgot that you need to type-cast the ActiveMDIChild. Here is the way to type-cast the ActiveMDIChild:
:

:   (ActiveMDIChild as TForm2).Memo1.Lines.SaveToFile('SomeFile.txt');
: 

: if the children are of the TForm2 type.
:

I'm sorry to trouble you again....
But I tried it too, and the result said that "Operator not applicableto this opperand type". What went wrong?

This message was edited by zibadian at 2004-10-16 17:35:36

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: : I'm sorry. I completely forgot that you need to type-cast the ActiveMDIChild. Here is the way to type-cast the ActiveMDIChild:
: :

: :   (ActiveMDIChild as TForm2).Memo1.Lines.SaveToFile('SomeFile.txt');
: : 

: : if the children are of the TForm2 type.
: :
:
: I'm sorry to trouble you again....
: But I tried it too, and the result said that "Operator not applicableto this opperand type". What went wrong?
:
You must have made a mistake in your code, because I just tested the code and it worked perfectly. If you post your coded I can see what's wrong.

: You must have made a mistake in your code, because I just tested the code and it worked perfectly. If you post your coded I can see what's wrong.
:
:
You're right, my mistake. I forgot to put the T in front of the Form2.
Thank you very much for your help.