Reading a Double value from memory

[potatos_x86]

Hi guys and gals,

I do IT support for a school, and they recently bought a no-name Chinese laser engraver for one of their classes. This thing has really basic software and hardly any documentation. My problem is that I want to create a script that alerts me (or a teacher) when it is done running a job, but it has no API or web interface or anything like that. I hate this machine, but it's my job to support it :/

I know the amount of Gcode steps that are required for a given job, so I was able to find the memory address in CheatEngine. I am attempting to read it with Nomadmemory.au3.

The value required is a Double, which apparently AutoIt does not play nicely with. I researched this for a few hours and didn't have any luck. I've run the variable against command like IsArray, IsBinary, IsNumber, etc.

The value is:

- A double, 8 bytes

- Is not a fraction

- Not an array

- Not a binary

- Is a number

- Is not hex

- Is not a string

 

So basically, I'm stumped as to how to read this value and turn it into a variable that my script can work with. I just need to logically compare it to my known amount of steps (173, in my case) and act based on that. I've tried converting the double value using Number, Int, Dec, Hex, etc., and calling the Double flag where applicable. No luck - it always shows $steps as a 0.

My (very rough) code:

#RequireAdmin
#AutoIt3Wrapper_UseX64=n
#include <NomadMemory.au3>
#include <WindowsConstants.au3>
#include <MsgBoxConstants.au3>
#include <String.au3>
SetPrivilege("SeDebugPrivilege", 1)



$dAddress = 0x0A65A4D8  ;;gcode steps count

$MemOpen = _MemoryOpen(ProcessExists("cdscutter_x86.exe"))
While 1
   $steps = Number((_MemoryRead($dAddress, $MemOpen)),2)

    
    ToolTip($steps,0,0)
    call("alert")
    Sleep(200)
 WEnd
 
 If $steps >= 173 then
 call("alert")
 EndIf
 
 Func alert ()
 ;;placeholder - email or Prowl alert;;
 EndFunc

 

[potatos_x86]

Can't edit my original post?

Also meant to say that I can successfully read values from this program when they are 4-byte integers, but doubles don't work at all.

[RTFC]

@potatos_x86: Welcome to the forums.

I would suggest you load the value into a struct (check out DllstructCreate and related commands in the Help), and then read the value from the struct. I can assure you that AutoIt most definitely supports doubles; I use them all the time.

[potatos_x86]

Ok, I've pasted this together with guidance from the DllStructCreate remarks, but it only passes zeroes.

Do you guys know what I'm doing wrong? Not sure if I need to specify that it's byte data, or specify that its source is a double. Deeply confused and would appreciate any input.

 

Local Const $tagSTRUCT1 = "struct;byte var1;byte var2;byte var3;byte var4[128];endstruct"
DllStructSetData($tSTRUCT1, "var4", ((_MemoryRead($dAddress, $MemOpen))))



 MsgBox($MB_SYSTEMMODAL, "", "Struct Size: " & DllStructGetSize($tSTRUCT1) & @CRLF & _
            "Struct pointer: " & DllStructGetPtr($tSTRUCT1) & @CRLF & _
            "Data:" & @CRLF & _
            DllStructGetData($tSTRUCT1, 1) & @CRLF & _ ; Or "var1" instead of 1.
            DllStructGetData($tSTRUCT1, "var2") & @CRLF & _ ; Or 2 instead of "var2".
            DllStructGetData($tSTRUCT1, 3) & @CRLF & _ ; Or "var3" instead of 3.
            DllStructGetData($tSTRUCT1, 4)) ; Or "var4" instead of 4.

 

[jchd]

Your code doesn't create the structure.

Provided the address is correct, what does this give?

Local $dAddress = 0x0A65A4D8  ;;gcode steps count address (example)

Local $tNbSteps = DllStructCreate("double", $dAddress)
DllStructSetData($tNbSteps, 1, (_MemoryRead($dAddress, $MemOpen)))

 MsgBox($MB_SYSTEMMODAL, "", "Struct Size: " & DllStructGetSize($tNbSteps) & @CRLF & _
            "Struct pointer: " & DllStructGetPtr($tNbSteps) & @CRLF & _
            "Data:" & @CRLF & DllStructGetData($tNbSteps, 1))

 

[toto22]

Good Day, I know its an old thread. However, I have same issue. My script keep on crashing.

I'm trying to get a "double" value from memory

Opt("WinTitleMatchMode", 4)
    Global $ProcessID = WinGetProcess("TI Pro")

    If $ProcessID = -1 Then
        MsgBox(4096, "ERROR", "Failed to detect process.")
        Exit
    EndIf

    Local $DllInformation = _MemoryOpen($ProcessID)
    If @Error Then
        MsgBox(4096, "ERROR", "Failed to open memory.")
        Exit
    EndIf

  Local $dAddress = 0x1FECD474
  Local $tNbSteps = DllStructCreate("double", $dAddress)
  Local $value = DllStructSetData($tNbSteps, 1, (_MemoryRead($dAddress, $DllInformation)))

     MsgBox($MB_SYSTEMMODAL, $value)

 

[Jos]

Define crashing?
What exactly are you trying here?

Jos

[toto22]

I get error message "Auto-it Script has stopped working"

my original script is this:

Opt("WinTitleMatchMode", 4)
    Global $ProcessID = WinGetProcess("TI Pro")

    If $ProcessID = -1 Then
        MsgBox(4096, "ERROR", "Failed to detect process.")
        Exit
    EndIf

    Local $DllInformation = _MemoryOpen($ProcessID)
    If @Error Then
        MsgBox(4096, "ERROR", "Failed to open memory.")
        Exit
    EndIf

    $Value = Number(_MemoryRead(0x1FECD474, $DllInformation),2)
    If @Error Then
        MsgBox(4096, "ERROR", "Failed to read memory.")
        Exit
    EndIf


    _MemoryClose($DllInformation)
    If @Error Then
        MsgBox(4096, "ERROR", "Failed to close memory.")
        Exit
    EndIf

It returns 4 Bit value. However, I need Double type value.