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Get Specific Hex value from Hex file
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Topic: Get Specific Hex value from Hex file (Read 5855 times)
fiazhnd
New Member
Posts: 36
Get Specific Hex value from Hex file
«
on:
June 13, 2017, 10:17:57 am »
Can someone please explain to me in simple way how i get hex value from a file after open required data like this (a byte, word, Dword and hex value 8 byte long) from Hex offset 0x010 into edit1 and so on.
Logged
Pascal
Hero Member
Posts: 932
Re: Get Specific Hex value from Hex file
«
Reply #1 on:
June 13, 2017, 10:28:26 am »
Try SysUtils.Fomat:
Code: Pascal
[Select]
[+]
[-]
hextringbyte
:
=
format
(
'%x'
,
[
bytevar
]
)
;
hexstringword
:
=
format
(
'%x'
,
[
wordvar
]
)
;
hexstringdword
:
=
format
(
'%x'
,
[
dwordvar
]
)
;
Logged
laz trunk x64 - fpc trunk i386 (cross x64) - Windows 10 Pro x64 (21H2)
fiazhnd
New Member
Posts: 36
Re: Get Specific Hex value from Hex file
«
Reply #2 on:
June 13, 2017, 10:31:45 am »
But How indicate the offset of hex file?
Logged
Thaddy
Hero Member
Posts: 14210
Probably until I exterminate Putin.
Re: Get Specific Hex value from Hex file
«
Reply #3 on:
June 13, 2017, 10:34:55 am »
Quote from: fiazhnd on June 13, 2017, 10:31:45 am
But How indicate the offset of hex file?
Use a filestream...? Sound like homework to me...
Btw:
https://www.freepascal.org/docs-html/rtl/classes/bintohex.html
Logged
Specialize a type, not a var.
fiazhnd
New Member
Posts: 36
Re: Get Specific Hex value from Hex file
«
Reply #4 on:
June 13, 2017, 10:59:55 am »
Boss issue is simple if i know how to use filestream to extract value i wasn't asked at what i want if someone just writes small code to extract value from 0x10. that will be really helpful
Logged
Thaddy
Hero Member
Posts: 14210
Probably until I exterminate Putin.
Re: Get Specific Hex value from Hex file
«
Reply #5 on:
June 13, 2017, 11:05:22 am »
Code: Pascal
[Select]
[+]
[-]
program
gotopos
;
{$mode objfpc}
uses
classes
;
var
s
:
TFilestream
;
begin
s
:
=
TFilestream
.
Create
(
'<yourfilename>'
,
fmOpenRead
)
;
try
s
.
Position
:
=
$10
;
// whatever;
finally
s
.
free
;
end
;
end
.
But I would write code that tests:
- if the file exists
- if it is indeed bigger than 16 bytes
- etc...
«
Last Edit: June 13, 2017, 11:10:06 am by Thaddy
»
Logged
Specialize a type, not a var.
fiazhnd
New Member
Posts: 36
Re: Get Specific Hex value from Hex file
«
Reply #6 on:
June 13, 2017, 02:06:47 pm »
Thank you Thaddy i think i am near what i wanted but still materially wrong
Code: Pascal
[Select]
[+]
[-]
procedure
TForm1
.
Button5Click
(
Sender
:
TObject
)
;
var
filename
:
string
;
s
:
TFilestream
;
begin
if
openDialog1
.
Execute
then
begin
filename
:
=
openDialog1
.
Filename
;
s
:
=
TFilestream
.
Create
(
filename
,
fmOpenRead
)
;
try
s
.
Position
:
=
$10
;
// whatever;
finally
Edit1
.
Text
:
=
IntToStr
(
$10
)
;
s
.
free
;
end
;
end
;
Closefile
(
Filename
)
;
end
;
Logged
howardpc
Hero Member
Posts: 4144
Re: Get Specific Hex value from Hex file
«
Reply #7 on:
June 13, 2017, 03:37:37 pm »
You could use something like this
Code: Pascal
[Select]
[+]
[-]
procedure
ShowValuesAtHex10
(
const
aFilename
:
string
;
const
aMemo
:
TMemo
)
;
var
fs
:
TFileStream
;
q
:
QWord
;
d
:
DWord
absolute
q
;
w
:
Word
absolute
q
;
b
:
Byte
absolute
q
;
begin
if
FileExists
(
aFilename
)
and
(
FileSize
(
aFilename
)
>
$20
)
and
Assigned
(
aMemo
)
then
begin
fs
:
=
TFilestream
.
Create
(
aFilename
,
fmOpenRead
)
;
try
fs
.
Position
:
=
$10
;
q
:
=
fs
.
ReadQWord
;
aMemo
.
Clear
;
aMemo
.
Append
(
Format
(
'Byte: %x'
,
[
b
]
)
)
;
aMemo
.
Append
(
Format
(
'Word: %x'
,
[
w
]
)
)
;
aMemo
.
Append
(
Format
(
'DWord: %x'
,
[
d
]
)
)
;
aMemo
.
Append
(
Format
(
'QWord: %x'
,
[
q
]
)
)
;
finally
fs
.
free
;
end
;
end
;
end
;
called using something like this:
Code: Pascal
[Select]
[+]
[-]
if
OpenDialog1
.
Execute
then
ShowValuesAtHex10
(
OpenDialog1
.
FileName
,
Memo1
)
;
Logged
fiazhnd
New Member
Posts: 36
Re: Get Specific Hex value from Hex file
«
Reply #8 on:
June 13, 2017, 05:05:37 pm »
Thank you, soo much work like a charm.
Logged
fiazhnd
New Member
Posts: 36
Re: Get Specific Hex value from Hex file
«
Reply #9 on:
June 13, 2017, 07:53:53 pm »
Mates, can i know why i received value of hex swap B8B479A4B9BF78FF instead of FF78BFB9A479B4B8 in Qword?
Logged
howardpc
Hero Member
Posts: 4144
Re: Get Specific Hex value from Hex file
«
Reply #10 on:
June 13, 2017, 08:04:17 pm »
Google for endianness, bigendian, littleendian.
Logged
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