Lazarus
Home
Help
TinyPortal
Search
Login
Register
Lazarus
»
Forum
»
Programming
»
LCL
»
[SOLVED]How to manually create, display and delete form
Free Pascal
Website
Downloads
Wiki
Documentation
Bugtracker
Mailing List
Lazarus
Website
Downloads (Laz+FPC)
Packages (OPM)
FAQ
Wiki
Documentation (RTL/FCL/LCL)
Bugtracker
CCR Bugs
IRC channel
GIT
Mailing List
Other languages
Foundation
Website
Useful Wiki Links
Project Roadmap
Getting the Source
Screenshots
How to use the forum
About donations (wiki)
Bookstore
Computer Math and Games in Pascal
(preview)
Lazarus Handbook
Search
Advanced search
Recent
Parameter passing odditie...
by
KodeZwerg
[
Today
at 11:04:39 pm]
Can function be used for ...
by
jamie
[
Today
at 10:53:10 pm]
(Solved) TIndexedAVLTree ...
by
lainz
[
Today
at 10:49:03 pm]
Demo Scene Picture sinwav...
by
KodeZwerg
[
Today
at 10:26:21 pm]
fkInternalCalc
by
zraja
[
Today
at 09:31:07 pm]
A fairly simple sound sol...
by
KodeZwerg
[
Today
at 09:23:37 pm]
add new targets to make
by
marcov
[
Today
at 08:38:42 pm]
how to tweek fpmake to co...
by
marcov
[
Today
at 08:29:16 pm]
Quirky windows
by
ASerge
[
Today
at 07:07:16 pm]
[Request] Demo Scene Sub ...
by
Gigatron
[
Today
at 06:29:39 pm]
Unlocking Files
by
KodeZwerg
[
Today
at 06:03:08 pm]
[SOLVED] trunk bug for mi...
by
Key-Real
[
Today
at 05:56:32 pm]
Demo Scene Bitmap Font Sc...
by
Gigatron
[
Today
at 05:56:27 pm]
Compile/Convert Delphi pr...
by
Martin_fr
[
Today
at 05:43:11 pm]
Generics - correct syntax
by
Thaddy
[
Today
at 05:40:59 pm]
Lazarus for Windows on aa...
by
msintle
[
Today
at 05:32:42 pm]
InstallAware Using Lazaru...
by
msintle
[
Today
at 05:26:36 pm]
Xcode Command Line Tools ...
by
Joseph
[
Today
at 05:16:39 pm]
Offical launch of the 1 B...
by
Hartmut
[
Today
at 04:49:29 pm]
what to do if my target M...
by
nickysn
[
Today
at 04:16:02 pm]
compiler error in unit
by
paule32
[
Today
at 03:49:50 pm]
Multithreading - synchron...
by
mika
[
Today
at 01:48:51 pm]
May be useful to somebody
by
KodeZwerg
[
Today
at 12:38:22 pm]
match automatic highlight...
by
Чебурашка
[
Today
at 11:35:14 am]
Tchart with dual numbers ...
by
wp
[
Today
at 10:48:18 am]
« previous
next »
Print
Pages: [
1
]
Author
Topic: [SOLVED]How to manually create, display and delete form (Read 1346 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: 1296
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: 1296
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.
Print
Pages: [
1
]
« previous
next »
Lazarus
»
Forum
»
Programming
»
LCL
»
[SOLVED]How to manually create, display and delete form
TinyPortal
© 2005-2018