Lazarus
Home
Help
TinyPortal
Search
Login
Register
Lazarus
»
Forum
»
Free Pascal
»
General
(Moderators:
FPK
,
Tomas Hajny
) »
Alias / Absolute (avoid variants) inside Records?
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
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]
what's difference between...
by
egsuh
[
Today
at 05:24:24 pm]
Lazarus for Windows on aa...
by
msintle
[
Today
at 05:03:57 pm]
splitting an image
by
Thaddy
[
Today
at 04:52:43 pm]
AI, NLP and CAI: Text Gen...
by
indydev
[
Today
at 04:51:00 pm]
Parameter passing odditie...
by
KodeZwerg
[
Today
at 03:41:49 pm]
How to: create DLL file f...
by
KodeZwerg
[
Today
at 03:24:20 pm]
Web Applications with Pas...
by
Nate897
[
Today
at 03:17:43 pm]
Surf Units in Text Mode I...
by
mosquito
[
Today
at 01:58:21 pm]
Ho Ho Ho IntraWeb in Laza...
by
Thaddy
[
Today
at 01:55:52 pm]
Generics - correct syntax
by
Thaddy
[
Today
at 01:48:32 pm]
FpDebug questions
by
440bx
[
Today
at 01:22:53 pm]
leetcode doesn’t support ...
by
codeninja
[
Today
at 01:16:43 pm]
Can function be used for ...
by
Joanna
[
Today
at 12:48:19 pm]
Access violation when ope...
by
Чебурашка
[
Today
at 12:14:30 pm]
Access violation when re-...
by
Chris Osborne
[
Today
at 11:43:49 am]
how to tweek fpmake to co...
by
marcov
[
Today
at 10:35:11 am]
Why isn't TTIRadioGroup's...
by
egsuh
[
Today
at 08:09:35 am]
(Solved) TIndexedAVLTree ...
by
lainz
[April 23, 2024, 10:49:03 pm]
Demo Scene Picture sinwav...
by
KodeZwerg
[April 23, 2024, 10:26:21 pm]
fkInternalCalc
by
zraja
[April 23, 2024, 09:31:07 pm]
A fairly simple sound sol...
by
KodeZwerg
[April 23, 2024, 09:23:37 pm]
add new targets to make
by
marcov
[April 23, 2024, 08:38:42 pm]
« previous
next »
Print
Pages: [
1
]
Author
Topic: Alias / Absolute (avoid variants) inside Records? (Read 893 times)
trn76
New Member
Posts: 40
Alias / Absolute (avoid variants) inside Records?
«
on:
October 30, 2020, 04:39:38 pm »
How can I use Alias / Absolute (avoid variant in records) inside Records? ...or some other neat solution, that would make my day now that I've had some more coffe'!
Code: Pascal
[Select]
[+]
[-]
..
type
Thead_info
=
packed
array
[
0
..
10
-
1
]
of
cuchar
;
Thead_archive
=
packed
array
[
0
..
31
-
1
]
of
cuchar
;
Thead_filename
=
packed
array
[
0
..
256
-
1
]
of
cuchar
;
Thead_comment
=
packed
array
[
0
..
256
-
1
]
of
cuchar
;
PPack
=
^
TPack
;
TPack
=
record
crc
:
cuint
;
sum
:
cuint
;
pack_size
:
cuint
;
unpack_size
:
cuint
;
mode
:
cint
;
year
:
cuint
;
month
:
cuint
;
day
:
cuint
;
hour
:
cuint
;
minute
:
cuint
;
second
:
cuint
;
attributes
:
cuint8
;
//pack_mode : cuint8; // <--- replace this
head_info
:
Thead_info
;
head_archive
:
Thead_archive
;
head_filename
:
Thead_filename
;
head_comment
:
Thead_comment
;
total_pack
:
cuint
;
total_unpack
:
cuint
;
total_files
:
cuint
;
merge_size
:
cuint
;
filFile
:
file
;
filName
:
string
;
filError
:
cuint
;
filList
:
PStringArray
;
nodeList
:
Pnode
;
pack_mode
:
cuint8
absolute
head_archive
[
11
]
;
// <--- with this ?
end
;
Yes I could do this:
Code: Pascal
[Select]
[+]
[-]
procedure
something
;
var
pack
:
TPack
;
mode
:
cuint8
;
begin
// access
mode
:
=
pack
.
head_archive
[
11
]
and
$1F
;
// but this is cleaner:
mode
:
=
pack
.
pack_mode
and
$1F
;
end
;
...hope you get my drift
Logged
ASerge
Hero Member
Posts: 2249
Re: Alias / Absolute (avoid variants) inside Records?
«
Reply #1 on:
October 30, 2020, 06:44:45 pm »
Code: Pascal
[Select]
[+]
[-]
{$MODE OBJFPC}
{$MODESWITCH ADVANCEDRECORDS}
type
TheadArchive
=
array
[
0
..
31
-
1
]
of
UInt8
;
TPack
=
record
strict
private
function
GetPackMode
:
UInt8
;
inline
;
public
Attributes
:
Int8
;
HeadArchive
:
TheadArchive
;
filError
:
Cardinal
;
property
PackMode
:
UInt8
read
GetPackMode
;
end
;
function
TPack
.
GetPackMode
:
UInt8
;
begin
Result
:
=
HeadArchive
[
11
]
;
end
;
var
Pack
:
TPack
;
Mode
:
UInt8
;
begin
Mode
:
=
Pack
.
HeadArchive
[
11
]
and
$1F
;
Mode
:
=
Pack
.
PackMode
and
$1F
;
end
.
Code: ASM
[Select]
[+]
[-]
#
[
29
]
Mode
:
= Pack
.
HeadArchive
[
11
]
and
$
1F
;
movw U_
$
P
$
PROJECT1_
$$
_PACK
+
12
(
%
rip
)
,%
ax
andw
$
31
,%
ax
# Var Mode located
in
register
al
.
Ll6
:
#
[
30
]
Mode
:
= Pack
.
PackMode
and
$
1F
;
movw U_
$
P
$
PROJECT1_
$$
_PACK
+
12
(
%
rip
)
,%
ax
andw
$
31
,%
ax
# Var Mode located
in
register
al
Logged
bytebites
Hero Member
Posts: 642
Re: Alias / Absolute (avoid variants) inside Records?
«
Reply #2 on:
October 30, 2020, 06:48:53 pm »
Code: Pascal
[Select]
[+]
[-]
{$ModeSwitch advancedrecords}
type
TPack
=
record
....
filError
:
cuint
;
filList
:
PStringArray
;
nodeList
:
Pnode
;
//pack_mode : cuint8; absolute head_archive[11]; // <--- with this ?
function
packmode
:
cuint8
;
end
;
...
function
TPack
.
packmode
:
cuint8
;
begin
result
:
=
pack_size
and
$1f
;
end
;
Logged
marcov
Administrator
Hero Member
Posts: 11459
FPC developer.
Re: Alias / Absolute (avoid variants) inside Records?
«
Reply #3 on:
October 30, 2020, 07:16:14 pm »
property packmode : cuint8 read head_archive[11];
Logged
Print
Pages: [
1
]
« previous
next »
Lazarus
»
Forum
»
Free Pascal
»
General
(Moderators:
FPK
,
Tomas Hajny
) »
Alias / Absolute (avoid variants) inside Records?
TinyPortal
© 2005-2018