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
DbGrid, grid column check...
by
1HuntnMan
[
Today
at 11:13:57 pm]
Colore celle StringGrid
by
JuanBell
[
Today
at 10:37:56 pm]
FpDebug likely bug
by
440bx
[
Today
at 10:12:59 pm]
Any upgrades to fpWeb pag...
by
verasan
[
Today
at 10:11:46 pm]
Web Applications with Pas...
by
Handoko
[
Today
at 08:56:29 pm]
AI, NLP and CAI: Text Gen...
by
indydev
[
Today
at 08:54:00 pm]
Offical launch of the 1 B...
by
Gustavo 'Gus' Carreno
[
Today
at 08:48:22 pm]
Multidimensional arrays a...
by
KodeZwerg
[
Today
at 08:34:38 pm]
Ho Ho Ho IntraWeb in Laza...
by
Thaddy
[
Today
at 08:31:29 pm]
[SOLVED] System.Now gives...
by
alpine
[
Today
at 08:29:19 pm]
open dialog - default dir...
by
Nicole
[
Today
at 08:02:40 pm]
Installing and using Vamp...
by
Odacir
[
Today
at 07:58:22 pm]
Demo Scene Picture sinwav...
by
circular
[
Today
at 07:27:02 pm]
Demo Scene Bitmap Font Sc...
by
KodeZwerg
[
Today
at 07:21:14 pm]
what's difference between...
by
ASerge
[
Today
at 07:09:52 pm]
splitting an image
by
KodeZwerg
[
Today
at 07:07:21 pm]
Debugger error
by
bobonwhidbey
[
Today
at 07:03:07 pm]
How to: create DLL file f...
by
paule32
[
Today
at 07:02:31 pm]
Your best UI design - con...
by
circular
[
Today
at 06:48:12 pm]
Converting a string/index...
by
1HuntnMan
[
Today
at 06:35:19 pm]
Drawing grid lines on a t...
by
KodeZwerg
[
Today
at 05:42:19 pm]
Compile/Convert Delphi pr...
by
Martin_fr
[
Today
at 05:29:03 pm]
Lazarus features in a non...
by
Lutz Mändle
[
Today
at 05:26:34 pm]
Lazarus for Windows on aa...
by
msintle
[
Today
at 05:03:57 pm]
Parameter passing odditie...
by
KodeZwerg
[
Today
at 03:41:49 pm]
« previous
next »
Print
Pages: [
1
]
Author
Topic: [SOLVED]How to manually create, display and delete form (Read 1349 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: 1298
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: 1298
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