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
Offical launch of the 1 B...
by
Gustavo 'Gus' Carreno
[
Today
at 12:50:46 am]
what to do if my target M...
by
Laksen
[
Today
at 12:49:12 am]
For-in loop over constant...
by
ASerge
[
Today
at 12:36:09 am]
Converting a string/index...
by
TRon
[April 18, 2024, 11:56:37 pm]
exclude ALL packages from...
by
PascalDragon
[April 18, 2024, 11:33:29 pm]
Demoscene The Champs Crac...
by
KodeZwerg
[April 18, 2024, 11:29:50 pm]
Poll: Watches and Display...
by
440bx
[April 18, 2024, 10:55:14 pm]
Database standards OR Am ...
by
dseligo
[April 18, 2024, 10:50:26 pm]
BUG REPORT: Unable to gen...
by
PascalDragon
[April 18, 2024, 10:24:23 pm]
How to: create DLL file f...
by
paule32
[April 18, 2024, 10:23:59 pm]
Have anyone develop UEFI ...
by
PascalDragon
[April 18, 2024, 10:14:15 pm]
Lazarus for Windows on aa...
by
PascalDragon
[April 18, 2024, 10:09:10 pm]
The weird Rewrite bug
by
PascalDragon
[April 18, 2024, 09:58:53 pm]
Assign (textfile) not com...
by
PascalDragon
[April 18, 2024, 09:51:50 pm]
Question for people who h...
by
PascalDragon
[April 18, 2024, 09:44:32 pm]
Linux Workspaces -- StayO...
by
AmatCoder
[April 18, 2024, 08:34:20 pm]
I just released a commerc...
by
Seenkao
[April 18, 2024, 07:57:21 pm]
Access violation when re-...
by
TRon
[April 18, 2024, 07:37:31 pm]
[SOLVED] assembler name i...
by
TRon
[April 18, 2024, 07:26:33 pm]
A fairly simple sound sol...
by
KodeZwerg
[April 18, 2024, 07:01:52 pm]
Step-into the field sette...
by
Martin_fr
[April 18, 2024, 06:54:19 pm]
[Fun Fact] PNG and Micros...
by
Ten_Mile_Hike
[April 18, 2024, 06:24:19 pm]
HTTP/2+HTTP/1.1+WebSocket...
by
iLya2IK
[April 18, 2024, 06:14:30 pm]
Improvement of TFPTimerTh...
by
AlexTP
[April 18, 2024, 05:56:38 pm]
Arabic text, problem on L...
by
nouzi
[April 18, 2024, 05:21:27 pm]
« previous
next »
Print
Pages: [
1
]
Author
Topic: Alias / Absolute (avoid variants) inside Records? (Read 880 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
$1F
;
end
;
...hope you get my drift
Logged
ASerge
Hero Member
Posts: 2242
Re: Alias / Absolute (avoid variants) inside Records?
«
Reply #1 on:
October 30, 2020, 06:44:45 pm »
Code: Pascal
[Select]
[+]
[-]
{$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: 640
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: 11452
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