Solved

Copy component  properties

Posted on 2002-06-07
2
552 Views
Last Modified: 2010-04-04
Hello,

Is there a general way to copy component properties (Only the published) from component A to B  (same type)
I  assume that not every component that descendent from TComponent have update assign procedure.

thank u
Asi
0
Comment
Question by:asi
2 Comments
 
LVL 11

Expert Comment

by:robert_marquardt
ID: 7061428
Yes it is possible. This trick is often used to implement Assign.
Component A writes itself to a TMemoryStream and component B reads itself from that same stream.
Have a look at TWriter.WriteComponent in the help for a starter.
0
 
LVL 1

Accepted Solution

by:
alx512 earned 50 total points
ID: 7061685
function CopyComponent(Component: TComponent; NewComponentName: String): TComponent;
var
  Stream: TMemoryStream;
  S: String;
begin
  Result := TComponentClass(Component.ClassType).Create(Component.Owner);
  S := Component.Name;
  Component.Name := NewComponentName;
  Stream := TMemoryStream.Create;
  try
    Stream.WriteComponent(Component);
    Component.Name := S;
    Stream.Seek(0, soFromBeginning);
    Stream.ReadComponent(Result);
  finally
    Stream.Free;
  end;
end;

procedure TForm1.CopyButtonClick(Sender: TObject);
var
  NumberEdit2: TNumberEdit;
begin
  NumberEdit2 := CopyComponent(NumberEdit1, 'NumberEdit2') as TNumberEdit;
  NumberEdit2.Top := NumberEdit2.Top + 50;
  InsertControl(NumberEdit2);
end;
0

Featured Post

Live: Real-Time Solutions, Start Here

Receive instant 1:1 support from technology experts, using our real-time conversation and whiteboard interface. Your first 5 minutes are always free.

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

Introduction The parallel port is a very commonly known port, it was widely used to connect a printer to the PC, if you look at the back of your computer, for those who don't have newer computers, there will be a port with 25 pins and a small print…
Have you ever had your Delphi form/application just hanging while waiting for data to load? This is the article to read if you want to learn some things about adding threads for data loading in the background. First, I'll setup a general applica…
Although Jacob Bernoulli (1654-1705) has been credited as the creator of "Binomial Distribution Table", Gottfried Leibniz (1646-1716) did his dissertation on the subject in 1666; Leibniz you may recall is the co-inventor of "Calculus" and beat Isaac…
With Secure Portal Encryption, the recipient is sent a link to their email address directing them to the email laundry delivery page. From there, the recipient will be required to enter a user name and password to enter the page. Once the recipient …

776 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question