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[SOLVED]How to manually create, display and delete form
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Topic: [SOLVED]How to manually create, display and delete form (Read 1337 times)
incendio
Sr. Member
Posts: 269
[SOLVED]How to manually create, display and delete form
«
on:
January 29, 2020, 04:24:51 am »
Hi guys,
I came from C++ Builder.
On C++ Builder, I use these codes to manually create a form and display it on Modal Type then after finished doing some actions on that form, manually destroy it.
Code: Pascal
[Select]
[+]
[-]
MyFrm
=
new
TMyFrm
(
Application
)
;
MyFrm
-
>ShowModal
(
)
;
MyFrm
-
>Update
(
)
;
delete MyFrm
;
What are the equivalent codes on Lazarus?
Thanks in advance.
«
Last Edit: January 29, 2020, 05:29:23 am by incendio
»
Logged
egsuh
Hero Member
Posts: 1291
Re: How to manually create, display and delete form
«
Reply #1 on:
January 29, 2020, 05:15:22 am »
Code: Pascal
[Select]
[+]
[-]
MyFrm
:
=
TMyFrm
.
Create
;
MyFrm
.
ShowModal
;
MyFrm
.
Update
;
MyFrm
.
Free
;
Logged
incendio
Sr. Member
Posts: 269
Re: How to manually create, display and delete form
«
Reply #2 on:
January 29, 2020, 05:28:54 am »
I changed first code to
Code: Pascal
[Select]
[+]
[-]
MyFrm
:
=
TMyFrm
.
Create
(
Application
)
It worked OK. Thanks a lot.
Logged
egsuh
Hero Member
Posts: 1291
Re: [SOLVED]How to manually create, display and delete form
«
Reply #3 on:
January 29, 2020, 05:38:07 am »
Oh yes. TForm.Create needs owner. Sorry, I didn't check it.
I think once you assign owner, you don't have to FREE it explicitly... Please confirm anybody.
Logged
lucamar
Hero Member
Posts: 4219
Re: [SOLVED]How to manually create, display and delete form
«
Reply #4 on:
January 29, 2020, 02:42:15 pm »
Quote from: egsuh on January 29, 2020, 05:38:07 am
I think once you assign owner, you don't have to FREE it explicitly... Please confirm anybody.
As with any other control: if you assign a proper owner, that owner will free it when it's itself freed. For cases like this, though, it's better to assign no owner, so the code should be somethng like:
Code: Pascal
[Select]
[+]
[-]
MyFrm
:
=
TMyFrm
.
Create
(
Nil
)
;
try
MyFrm
.
ShowModal
;
//MyFrm.Update; {This is not needed, is it? since it's inmediately freed?}
finally
MyFrm
.
Free
;
end
;
Logged
Turbo Pascal 3 CP/M - Amstrad PCW 8256 (512 KB !!!)
Lazarus/FPC 2.0.8/3.0.4 & 2.0.12/3.2.0 - 32/64 bits on:
(K|L|X)Ubuntu 12..18, Windows XP, 7, 10 and various DOSes.
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