Re: Write Hex Bytes
> 2019/02/22 9:45、Keisuke Miyako via 4D_Tech <4d_tech@lists.4d.com>のメール: > the task was to process a single value 78,487,500 or 0xCC9FAD04; correction: decimal 78,487,500 is 0x04AD9FCC > If I have a number 78487500, this translates to CC 9F AD 04. but PC byte ordering will give you CC 9F AD 04 (as Justin correctly pointed out) ** 4D Internet Users Group (4D iNUG) Archive: http://lists.4d.com/archives.html Options: https://lists.4d.com/mailman/options/4d_tech Unsub: mailto:4d_tech-unsubscr...@lists.4d.com **
Re: Write Hex Bytes
you're right, I re-read the OP, the task was to process a single value 78,487,500 or 0xCC9FAD04; not 4 separate decimal values 78, 48, 75 and 00 > 2019/02/22 9:43、Justin Carr via 4D_Tech <4d_tech@lists.4d.com>のメール: > > C_BLOB($vX_Data) > C_LONGINT($vL_Offset) > > $vL_Offset:=0 > LONGINT TO BLOB(78487500;$vX_Data;PC byte ordering;$vL_Offset) ** 4D Internet Users Group (4D iNUG) Archive: http://lists.4d.com/archives.html Options: https://lists.4d.com/mailman/options/4d_tech Unsub: mailto:4d_tech-unsubscr...@lists.4d.com **
Re: Write Hex Bytes
On 22 Feb 2019, at 10:30 am, Keisuke Miyako via 4D_Tech <4d_tech@lists.4d.com>
wrote:
>
> it sounds like you are over-thinking :)
>
> you could just do
>
> SET BLOB SIZE($bytes;4)
>
> $bytes{0}:=78
> $bytes{1}:=48
> $bytes{2}:=75
> $bytes{3}:=00
>
> then BLOB TO DOCUMENT.
>
> not need to go through hex.
Or even easier:
C_BLOB($vX_Data)
C_LONGINT($vL_Offset)
$vL_Offset:=0
LONGINT TO BLOB(78487500;$vX_Data;PC byte ordering;$vL_Offset)
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Re: Write Hex Bytes
it sounds like you are over-thinking :)
you could just do
SET BLOB SIZE($bytes;4)
$bytes{0}:=78
$bytes{1}:=48
$bytes{2}:=75
$bytes{3}:=00
then BLOB TO DOCUMENT.
not need to go through hex.
2019/02/22 9:27、Peter Mew via 4D_Tech
<4d_tech@lists.4d.com>のメール:
If I have a number 78487500, this translates to CC 9F AD 04.
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Re: Write Hex Bytes
Hi Actually, I dont think this quite what I want, Unless Im Misunderstanding whats going on. If I have a number 78487500, this traslates to CC 9F AD 04. If I carry out your method, I get 8 bytes added to the initial string. However,If I read the hex number from a file on disc, it only takes up 4 bytes So CC is 1 byte, 9F is one byte, and so on This what I want To be able to add the Hex string to an existing string, so when I look at it on disc it only takes up 4 bytes To see this in action, look at the first 12 Bytes of any wav header Bytes 1-4 hold the Hex version of the Letters RIFF the next 4 Bytes hold the Hex version of the total length of the file-8 bytes Bytes 9-12 hold the Hex Version of the Letters WAVE and so on. What I want is, knowing the Total Length of the File in Hex, How do I arrange the string I;m going to write to file, so the Length is comtained in 4 bytes, Including padding bytes if necessary Sorry, long winded explanation thanks -pm On Thu, Feb 21, 2019 at 11:22 PM Peter Mew wrote: > Hi > Yes, Thats it almost exactly, I just need to convert to little endian, I > think I can manage that! > Thanks > -pm > > On Thu, Feb 21, 2019 at 10:45 PM Arnaud de Montard via 4D_Tech < > 4d_tech@lists.4d.com> wrote: > >> >> > Le 21 févr. 2019 à 22:09, Peter Mew via 4D_Tech <4d_tech@lists.4d.com> >> a écrit : >> > >> > Hi >> > This is driving me mad, so I hope someone will point me in the right >> > direction. >> > I have a string of text. >> > I can find its length in Hex. now I want to write this length as 4 hex >> > bytes, into the string, with the aim of doing a text to blob, later on. >> > If I just add the Hex Number to the string it takes 8 bytes >> > (String+HexByte0+HexByte1+HexByte2+HexByte3) >> > If I convert the Hex Numbers to decimal and Do >> > String+char(DecByte0)+char(DecByte1) etc. >> > It takes up 4 Bytes but the Numbers written to the string are wrong. >> >> Something like that? >> >> $hello:="hello world!" >> $len:=Length($hello) >> $hex:=String($len;"&x") >> $hex:=Substring($hex;3) >> $string:=$hex+$hello+"x" >> C_BLOB($blb) >> $charset:="utf-8" >> CONVERT FROM TEXT($string;$charset;$blb) >> $string2:=Convert to text($blb;$charset) >> $offset:=4 >> $hex2:=Substring($string2;1;$offset) >> $len2:=hexaToDecimal ($hex2) >> $hello2:=Substring($string2;$offset+1;$len2) >> ASSERT($len2=$len) >> ASSERT($hex2=$hex) >> ASSERT($hello2=$hello) >> >> -- >> Arnaud de Montard >> >> >> >> ** >> 4D Internet Users Group (4D iNUG) >> Archive: http://lists.4d.com/archives.html >> Options: https://lists.4d.com/mailman/options/4d_tech >> Unsub: mailto:4d_tech-unsubscr...@lists.4d.com >> ** > > ** 4D Internet Users Group (4D iNUG) Archive: http://lists.4d.com/archives.html Options: https://lists.4d.com/mailman/options/4d_tech Unsub: mailto:4d_tech-unsubscr...@lists.4d.com **
Re: Write Hex Bytes
Hi Yes, Thats it almost exactly, I just need to convert to little endian, I think I can manage that! Thanks -pm On Thu, Feb 21, 2019 at 10:45 PM Arnaud de Montard via 4D_Tech < 4d_tech@lists.4d.com> wrote: > > > Le 21 févr. 2019 à 22:09, Peter Mew via 4D_Tech <4d_tech@lists.4d.com> > a écrit : > > > > Hi > > This is driving me mad, so I hope someone will point me in the right > > direction. > > I have a string of text. > > I can find its length in Hex. now I want to write this length as 4 hex > > bytes, into the string, with the aim of doing a text to blob, later on. > > If I just add the Hex Number to the string it takes 8 bytes > > (String+HexByte0+HexByte1+HexByte2+HexByte3) > > If I convert the Hex Numbers to decimal and Do > > String+char(DecByte0)+char(DecByte1) etc. > > It takes up 4 Bytes but the Numbers written to the string are wrong. > > Something like that? > > $hello:="hello world!" > $len:=Length($hello) > $hex:=String($len;"&x") > $hex:=Substring($hex;3) > $string:=$hex+$hello+"x" > C_BLOB($blb) > $charset:="utf-8" > CONVERT FROM TEXT($string;$charset;$blb) > $string2:=Convert to text($blb;$charset) > $offset:=4 > $hex2:=Substring($string2;1;$offset) > $len2:=hexaToDecimal ($hex2) > $hello2:=Substring($string2;$offset+1;$len2) > ASSERT($len2=$len) > ASSERT($hex2=$hex) > ASSERT($hello2=$hello) > > -- > Arnaud de Montard > > > > ** > 4D Internet Users Group (4D iNUG) > Archive: http://lists.4d.com/archives.html > Options: https://lists.4d.com/mailman/options/4d_tech > Unsub: mailto:4d_tech-unsubscr...@lists.4d.com > ** ** 4D Internet Users Group (4D iNUG) Archive: http://lists.4d.com/archives.html Options: https://lists.4d.com/mailman/options/4d_tech Unsub: mailto:4d_tech-unsubscr...@lists.4d.com **
Re: Write Hex Bytes
> Le 21 févr. 2019 à 22:09, Peter Mew via 4D_Tech <4d_tech@lists.4d.com> a > écrit : > > Hi > This is driving me mad, so I hope someone will point me in the right > direction. > I have a string of text. > I can find its length in Hex. now I want to write this length as 4 hex > bytes, into the string, with the aim of doing a text to blob, later on. > If I just add the Hex Number to the string it takes 8 bytes > (String+HexByte0+HexByte1+HexByte2+HexByte3) > If I convert the Hex Numbers to decimal and Do > String+char(DecByte0)+char(DecByte1) etc. > It takes up 4 Bytes but the Numbers written to the string are wrong. Something like that? $hello:="hello world!" $len:=Length($hello) $hex:=String($len;"&x") $hex:=Substring($hex;3) $string:=$hex+$hello+"x" C_BLOB($blb) $charset:="utf-8" CONVERT FROM TEXT($string;$charset;$blb) $string2:=Convert to text($blb;$charset) $offset:=4 $hex2:=Substring($string2;1;$offset) $len2:=hexaToDecimal ($hex2) $hello2:=Substring($string2;$offset+1;$len2) ASSERT($len2=$len) ASSERT($hex2=$hex) ASSERT($hello2=$hello) -- Arnaud de Montard ** 4D Internet Users Group (4D iNUG) Archive: http://lists.4d.com/archives.html Options: https://lists.4d.com/mailman/options/4d_tech Unsub: mailto:4d_tech-unsubscr...@lists.4d.com **
Re: Write Hex Bytes
**IF** I understand what you are trying to do
you are halfway there in both cases, and is fairly easy.
I think what you want is:
String+Hex[[1]]+Hex[[2]]+...+Hex[[n]]
Example:
"This is my string of which I want the length"
(decimal) 44 characters
44 (dec) = 2C (hex)
final value:
"This is my string of which I want the length2C
so...
$Text:=
$Hex_Length_txt:=myutl_Convert_to_Hex(LENGTH($Text))
$Text:=$Text+$Hex_Length_txt
code for converting to hex:
PHP Execute("";"dechex";$Hex_Value;$Decimal_Value)
NOTES:
- this has a max decimal conversion value of +/- MAXLONGINT
- the hex value is returned in $Hex_Value
- "dechex" is the PHP library command
- first empty string is library path ("" = main/basic PHP library)
On Thu, 21 Feb 2019 21:09:51 +, Peter Mew via 4D_Tech wrote:
> Hi
> This is driving me mad, so I hope someone will point me in the right
> direction.
> I have a string of text.
> I can find its length in Hex. now I want to write this length as 4 hex
> bytes, into the string, with the aim of doing a text to blob, later on.
> If I just add the Hex Number to the string it takes 8 bytes
> (String+HexByte0+HexByte1+HexByte2+HexByte3)
> If I convert the Hex Numbers to decimal and Do
> String+char(DecByte0)+char(DecByte1) etc.
> It takes up 4 Bytes but the Numbers written to the string are wrong.
> Please help
> thanks
> -pm
> **
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