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How to exchange data between forms?

C++ Builder 5.0: Building MDI Application.I have first form named Form1 and there I want to input some data (long double Number1, Number2, Number(...);). Then I want to use this numbers to calculate something but on the ChildForm or on the new forms named Form2, Form3, Form(...).
How to do that? (Maybe it can be usefull to create some little aplication with comments in code, compress it with WinRAR or WinZIP and send it to me).
                      Thank You.
0
Peca
Asked:
Peca
1 Solution
 
DrDelphiCommented:
Why don't you just make the data Public? This way,any other form (or unit) would be able to read it.

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TriskelionCommented:
How much data?
Can you make global variables?




global variables
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AlexVirochovskyCommented:
I assume you are using an MDI parent as your main window. If this is true, use

Application->MainForm to access the MDI parent window.

to access this parent. The parent window can either know about each of the
shared data classes, or, you could iterate throught the ->MDIChildren[ ] to
find the form you are interested in.

Other ways:
a) Send messages with the data.
 Uses either Windows messages, Delphi messages or some more complex
messaging like DDE to pass data. Windows messages are sent with the
Windows API SendMessage and can include something like a pointer to more
complex data or simple 32 bit numeric data. Delphi messages are send the
same way, but have a different set of codes. DDE is a technology of its
own, and BCB provides components to work with it, but you'll have to
look them up.

b) Set up a shared proxy object containing the shared data.I recommend using a data module. The
data module does not need to contain any components - you just add
public properties backed with private variables, like:

private:

double FSharedFloat;

public:

__property double SharedFloat = {read=FSharedFloat,
write=FSharedFloat};

Obviously you could also expose the variable directly.

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griesshCommented:
I think you forgot this question. I will ask Community Support to close it unless you finalize it within 7 days. Unless there is objection or further activity,  I will suggest to accept "AlexVirchovski" comment(s) as an answer.

If you think your question was not answered at all, you can post a request in Community support (please include this link) to refund your points.
The link to the Community Support area is: http://www.experts-exchange.com/commspt

PLEASE DO NOT ACCEPT THIS COMMENT AS AN ANSWER!
======
Werner
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PecaAuthor Commented:
I resolve the problem.
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PecaAuthor Commented:
I resolve the problem.
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NetminderCommented:
Peca,

If you will please post what you did to resolve the problem, I will refund your points to you and close this question.

Thanks,

Netminder
CS Moderator
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NetminderCommented:
User declined to explain how he resolved the issue. Force-accepted by
Netminder
CS Moderator
0
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