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How to convert hex value to string?

 
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Dr.Disrespect
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PostPosted: Thu Jun 08, 2017 10:30 am    Post subject: How to convert hex value to string? Reply with quote

In CE lua script, how to convert hex value to string?
I know the hex value and encoding, but don't know how to convert them, vice versa.

PS: it's a non-English string.

Thanks in advance.

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FreeER
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PostPosted: Thu Jun 08, 2017 2:28 pm    Post subject: Reply with quote

hex like 0xFF being 255?

Code:
hexValue = 0xaF -- same as hexValue = 175
hexstr1 = string.format("%x", hexValue) -- af
hexstr2 = string.format("%X", hexValue) -- AF
hexstr3 = string.format("%#x", hexValue) -- 0xAF

hexValue1 = tonumber(hexstr1, 16)
hexValue2 = tonumber(hexstr2, 16)
hexValue3 = tonumber(hexstr3, 16)
hexValue4 = tonumber(hexstr3:sub(3), 16)

hexValue5 = tonumber(hexstr3:gsub('^0x',''), 16)
hexValue6 = tonumber(hexstr1:gsub('^0x',''), 16)

print(hexstr1)
print(hexstr2)
print(hexstr3)
print()
print(hexValue1)
print(hexValue2)
print(hexValue3)
print(hexValue4)
print()
print(hexValue5)
print(hexValue6)

-- you can create your own functions to do it like so
string.toHex = function(num)
  return string.format("%#X", num)
end
string.fromHex = function(str)
  return tonumber(str:lower():gsub('^0x',''), 16)
end

hexstr = string.toHex(255)
hexval = string.fromHex(hexstr)-- hexstr:fromHex()
print(tostring(hexval) .. " is " .. hexstr)
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Dr.Disrespect
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PostPosted: Thu Jun 08, 2017 3:09 pm    Post subject: Reply with quote

FreeER wrote:
hex like 0xFF being 255?

Code:
hexValue = 0xaF -- same as hexValue = 175
hexstr1 = string.format("%x", hexValue) -- af
hexstr2 = string.format("%X", hexValue) -- AF
hexstr3 = string.format("%#x", hexValue) -- 0xAF

hexValue1 = tonumber(hexstr1, 16)
hexValue2 = tonumber(hexstr2, 16)
hexValue3 = tonumber(hexstr3, 16)
hexValue4 = tonumber(hexstr3:sub(3), 16)

hexValue5 = tonumber(hexstr3:gsub('^0x',''), 16)
hexValue6 = tonumber(hexstr1:gsub('^0x',''), 16)

print(hexstr1)
print(hexstr2)
print(hexstr3)
print()
print(hexValue1)
print(hexValue2)
print(hexValue3)
print(hexValue4)
print()
print(hexValue5)
print(hexValue6)

-- you can create your own functions to do it like so
string.toHex = function(num)
  return string.format("%#X", num)
end
string.fromHex = function(str)
  return tonumber(str:lower():gsub('^0x',''), 16)
end

hexstr = string.toHex(255)
hexval = string.fromHex(hexstr)-- hexstr:fromHex()
print(tostring(hexval) .. " is " .. hexstr)


Thanks for the reply, but I want to convert hex value to characters, and I don't think LUA can easily do that as in C#. Sad

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FreeER
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PostPosted: Thu Jun 08, 2017 3:18 pm    Post subject: Reply with quote

Like ascii values eg. 0x61 to 'A'?

Code:
print(string.char(0x61))


Do you need to handle unicode? Or just ascii but 2 byte characters? Knowing exactly what you are trying to do would make looking info up easier (I know some of the basic of using lua but I'm no expert, however I tend to be decent at using google lol)

panraven wrote some code before to turn a widestring (unicode) into it's bytes so I'm sure you can do something similar to convert from bytes to a string see http://forum.cheatengine.org/viewtopic.php?p=5723462#5723462
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Dr.Disrespect
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PostPosted: Thu Jun 08, 2017 3:24 pm    Post subject: Reply with quote

FreeER wrote:
Like ascii values eg. 0x61 to 'A'?

Code:
print(string.char(0x61))


Do you need to handle unicode? Or just ascii but 2 byte characters? Knowing exactly what you are trying to do would make looking info up easier (I know some of the basic of using lua but I'm no expert, however I tend to be decent at using google lol)

panraven wrote some code before to turn a widestring (unicode) into it's bytes so I'm sure you can do something similar to convert from bytes to a string see http://forum.cheatengine.org/viewtopic.php?p=5723462#5723462


I am trying to convert hex value into traditional Chinese.
For example, in C#, i will first convert the hex value into bytes, then convert the bytes into string. Something like this:
Code:

string output = Encoding.GetEncoding("BIG5").GetString(codeBytes);
//codeBytes is a byte array converted from hex value


Can you understand what I mean? My English is not so good, sorry.

Also, I will take a look at the link and provide feedback. Thanks.

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FreeER
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PostPosted: Thu Jun 08, 2017 5:50 pm    Post subject: Reply with quote

Makes sense, though I don't see anything obvious from google other than utf8 which I assume won't work with BIG5 Smile

Perhaps someone else will be able to provide more help (or at least a more confident answer) however
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Dr.Disrespect
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PostPosted: Thu Jun 08, 2017 7:51 pm    Post subject: Reply with quote

FreeER wrote:
Makes sense, though I don't see anything obvious from google other than utf8 which I assume won't work with BIG5 Smile

Perhaps someone else will be able to provide more help (or at least a more confident answer) however


Still appreciate the help. Smile

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panraven
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PostPosted: Thu Jun 08, 2017 10:37 pm    Post subject: Reply with quote

It seems the newest ce 6.7 just released support Codepage String display,
but the codepage seems depend on user's os setting,
ie. the codepage the os to be used when handle non-unicode application,
in os regional and language setting.
It seems no other ce function to set an arbitrary codepage to force ce to display the string on user's machine.

In CE 6.7+ memory record, set string type, click [Codepage] checkbox.
In Lua
Code:

local mr = GetAddressList()[0] -- get mr
mr.String.Codepage = true -- set using codepage, given mr.Type == vtString



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Dr.Disrespect
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PostPosted: Mon Jun 12, 2017 7:44 am    Post subject: Reply with quote

panraven wrote:
It seems the newest ce 6.7 just released support Codepage String display,
but the codepage seems depend on user's os setting,
ie. the codepage the os to be used when handle non-unicode application,
in os regional and language setting.
It seems no other ce function to set an arbitrary codepage to force ce to display the string on user's machine.

In CE 6.7+ memory record, set string type, click [Codepage] checkbox.
In Lua
Code:

local mr = GetAddressList()[0] -- get mr
mr.String.Codepage = true -- set using codepage, given mr.Type == vtString

Sorry for the late reply. Thanks for the example.

I really hope CE can use codepage tho. Smile

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Csimbi
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PostPosted: Sun Oct 17, 2021 4:19 am    Post subject: Reply with quote

Hi guys,
I have this code:
Code:
  local textBytes = ''
  local byte = readShortInteger(myAddress)
  int i = 0
  while i < 14 do
    byte = readShortInteger(myAddress+i)
    textBytes = textBytes .. string.format('%02X', byte) .. ' '
    i = i + 1
  end

The output it produces is:
Code:
55 FF8B FFEC FF8B 45 08 56 FF8B 48 3C 03 FFC8 0F FFB7

while the input was:
Code:
55 8B EC 8B 45 08 56 8B 48 3C 03 C8 0F B7 41 14


How would I convert without getting those extra FFs?
(I would like to get to a real int to hex conversion of a single BYTE only, it seems it takes a WORD.)

Thank you!
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Dark Byte
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PostPosted: Sun Oct 17, 2021 5:13 am    Post subject: Reply with quote

looks like the Pascal compiler decided to see shortint the same as smallint (it shouldn't)

i'll fix it in next version. (you can & it with 0xff)

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Csimbi
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PostPosted: Sun Oct 17, 2021 6:12 am    Post subject: Reply with quote

Dark Byte wrote:
looks like the Pascal compiler decided to see shortint the same as smallint (it shouldn't)

i'll fix it in next version. (you can & it with 0xff)

Yep, this did the trick, thanks!
Code:
    byte = readShortInteger(injectAddressNum+i) & 0xff
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