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Zedna

FileReadLastChars

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#include <WinAPI.au3>

$text = FileReadLastChars("C:\Program Files\AutoIt3\Include\Array.au3", 1024)
MsgBox(0, 'FileReadLastChars', $text)

Func FileReadLastChars($sFile, $nChars)
    Local $nBytes
    $tBuffer = DLLStructCreate("char["&$nChars&"]")
    $hFile = _WinAPI_CreateFile($sFile, 2, 2) ; open for read
    _WinAPI_SetFilePointer($hFile, -1 * $nChars, 2) ; from end
    _WinAPI_ReadFile($hFile, DLLStructGetPtr($tBuffer), $nChars, $nBytes)
    _WinAPI_CloseHandle($hFile)
    Return DLLStructGetData($tBuffer, 1)
EndFunc

; included as standard UDF since AutoIt 3.2.13.6 version
Func _WinAPI_SetFilePointer($hFile, $iPos, $iMethod = 0)
    $aResult = DllCall( "kernel32.dll", "long", "SetFilePointer", "hwnd", $hFile, "long", $iPos, "long_ptr", 0, "long", $iMethod)
    If @error Then Return SetError(1, 0, -1)
    If $aResult[0] = -1 Then Return SetError(2, 0, -1) ; $INVALID_SET_FILE_POINTER = -1
    Return $aResult[0]
EndFunc ;==>_WinAPI_SetFilePointer

Here is my topic about _WinAPI_SetFilePointer()

'?do=embed' frameborder='0' data-embedContent>>

Edited by Zedna

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Thanks Zedna. Here is a native version...
 

#include <FileConstants.au3>
#include <MsgBoxConstants.au3>

Global Enum Step * 2 $FRLC_FILENOTEXISTS, $FRLC_ISNOTDIGIT, $FRLC_OUTOFBOUNDS, $FRLC_ENDOFFILE

Local $sText = FileReadLastChars(@ScriptFullPath, 204)
ConsoleWrite('@error: ' & @error & ', Text: ' & $sText & @CRLF)
MsgBox($MB_SYSTEMMODAL, 'FileReadLastChars', $sText)

Func FileReadLastChars($sFilePath, $iChars) ; Idea by Zedna, created by guinness
    Local $sData = ''
    Local $hFileOpen = FileOpen($sFilePath, $FO_READ)
    If $hFileOpen = -1 Then Return SetError($FRLC_FILENOTEXISTS, 0, $sData) ; If the file doesn't exist or an unexpected error occurred
    If IsString($iChars) Then ; If $iChars happens to be a string
        If Not StringIsDigit($iChars) Then
            FileClose($hFileOpen)
            Return SetError($FRLC_ISNOTDIGIT, 0, $sData) ; If not an string representing an integer then set an @error
        EndIf
        $iChars = Int($iChars) ; Parse as an integer
    EndIf

    If $iChars <= 0 Or $iChars > FileGetSize($sFilePath) Then
        FileClose($hFileOpen)
        Return SetError($FRLC_OUTOFBOUNDS, 0, $sData) ; If less than or equal to zero or greater than the file size
    EndIf

    If FileSetPos($hFileOpen, -1 * $iChars, $FILE_END) Then
        $sData = FileRead($hFileOpen, $iChars) ; Read the file based on the position and number of chars
        If @error Then
            FileClose($hFileOpen)
            Return SetError($FRLC_ENDOFFILE, 0, $sData)
        EndIf
    EndIf

    FileClose($hFileOpen)
    Return $sData
EndFunc   ;==>FileReadLastChars

UDF List:

 
_AdapterConnections()_AlwaysRun()_AppMon()_AppMonEx()_ArrayFilter/_ArrayReduce_BinaryBin()_CheckMsgBox()_CmdLineRaw()_ContextMenu()_ConvertLHWebColor()/_ConvertSHWebColor()_DesktopDimensions()_DisplayPassword()_DotNet_Load()/_DotNet_Unload()_Fibonacci()_FileCompare()_FileCompareContents()_FileNameByHandle()_FilePrefix/SRE()_FindInFile()_GetBackgroundColor()/_SetBackgroundColor()_GetConrolID()_GetCtrlClass()_GetDirectoryFormat()_GetDriveMediaType()_GetFilename()/_GetFilenameExt()_GetHardwareID()_GetIP()_GetIP_Country()_GetOSLanguage()_GetSavedSource()_GetStringSize()_GetSystemPaths()_GetURLImage()_GIFImage()_GoogleWeather()_GUICtrlCreateGroup()_GUICtrlListBox_CreateArray()_GUICtrlListView_CreateArray()_GUICtrlListView_SaveCSV()_GUICtrlListView_SaveHTML()_GUICtrlListView_SaveTxt()_GUICtrlListView_SaveXML()_GUICtrlMenu_Recent()_GUICtrlMenu_SetItemImage()_GUICtrlTreeView_CreateArray()_GUIDisable()_GUIImageList_SetIconFromHandle()_GUIRegisterMsg()_GUISetIcon()_Icon_Clear()/_Icon_Set()_IdleTime()_InetGet()_InetGetGUI()_InetGetProgress()_IPDetails()_IsFileOlder()_IsGUID()_IsHex()_IsPalindrome()_IsRegKey()_IsStringRegExp()_IsSystemDrive()_IsUPX()_IsValidType()_IsWebColor()_Language()_Log()_MicrosoftInternetConnectivity()_MSDNDataType()_PathFull/GetRelative/Split()_PathSplitEx()_PrintFromArray()_ProgressSetMarquee()_ReDim()_RockPaperScissors()/_RockPaperScissorsLizardSpock()_ScrollingCredits_SelfDelete()_SelfRename()_SelfUpdate()_SendTo()_ShellAll()_ShellFile()_ShellFolder()_SingletonHWID()_SingletonPID()_Startup()_StringCompact()_StringIsValid()_StringRegExpMetaCharacters()_StringReplaceWholeWord()_StringStripChars()_Temperature()_TrialPeriod()_UKToUSDate()/_USToUKDate()_WinAPI_Create_CTL_CODE()_WinAPI_CreateGUID()_WMIDateStringToDate()/_DateToWMIDateString()Au3 script parsingAutoIt SearchAutoIt3 PortableAutoIt3WrapperToPragmaAutoItWinGetTitle()/AutoItWinSetTitle()CodingDirToHTML5FileInstallrFileReadLastChars()GeoIP databaseGUI - Only Close ButtonGUI ExamplesGUICtrlDeleteImage()GUICtrlGetBkColor()GUICtrlGetStyle()GUIEventsGUIGetBkColor()Int_Parse() & Int_TryParse()IsISBN()LockFile()Mapping CtrlIDsOOP in AutoItParseHeadersToSciTE()PasswordValidPasteBinPosts Per DayPreExpandProtect GlobalsQueue()Resource UpdateResourcesExSciTE JumpSettings INISHELLHOOKShunting-YardSignature CreatorStack()Stopwatch()StringAddLF()/StringStripLF()StringEOLToCRLF()VSCROLLWM_COPYDATAMore Examples...

Updated: 22/04/2018

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msgbox(0, '' , _FileReadLastChar(@ScriptFullPath , 7))

Func _FileReadLastChar($file , $count)
    $hFile = FileOpen($file)
    $pos = FileSetPos($hFile , $count * -1 , 2)
    $sOut = FileRead($hFile)
    return $sOut
EndFunc

Edited by boththose

,-. .--. ________ .-. .-. ,---. ,-. .-. .-. .-.
|(| / /\ \ |\ /| |__ __||| | | || .-' | |/ / \ \_/ )/
(_) / /__\ \ |(\ / | )| | | `-' | | `-. | | / __ \ (_)
| | | __ | (_)\/ | (_) | | .-. | | .-' | | \ |__| ) (
| | | | |)| | \ / | | | | | |)| | `--. | |) \ | |
`-' |_| (_) | |\/| | `-' /( (_)/( __.' |((_)-' /(_|
'-' '-' (__) (__) (_) (__)

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Learn how to error check, especially when you're creating a UDF.

 

msgbox(0, '' , _FileReadLastChar(@ScriptFullPath , 7))

Func _FileReadLastChar($file , $count)
    $hFile = FileOpen($file)
    $pos = FileSetPos($hFile , $count * -1 , 2)
    $sOut = FileRead($hFile)
    return $sOut
EndFunc

This is wrong. Please read the help file again as cleaning up resources is important. Edited by guinness

UDF List:

 
_AdapterConnections()_AlwaysRun()_AppMon()_AppMonEx()_ArrayFilter/_ArrayReduce_BinaryBin()_CheckMsgBox()_CmdLineRaw()_ContextMenu()_ConvertLHWebColor()/_ConvertSHWebColor()_DesktopDimensions()_DisplayPassword()_DotNet_Load()/_DotNet_Unload()_Fibonacci()_FileCompare()_FileCompareContents()_FileNameByHandle()_FilePrefix/SRE()_FindInFile()_GetBackgroundColor()/_SetBackgroundColor()_GetConrolID()_GetCtrlClass()_GetDirectoryFormat()_GetDriveMediaType()_GetFilename()/_GetFilenameExt()_GetHardwareID()_GetIP()_GetIP_Country()_GetOSLanguage()_GetSavedSource()_GetStringSize()_GetSystemPaths()_GetURLImage()_GIFImage()_GoogleWeather()_GUICtrlCreateGroup()_GUICtrlListBox_CreateArray()_GUICtrlListView_CreateArray()_GUICtrlListView_SaveCSV()_GUICtrlListView_SaveHTML()_GUICtrlListView_SaveTxt()_GUICtrlListView_SaveXML()_GUICtrlMenu_Recent()_GUICtrlMenu_SetItemImage()_GUICtrlTreeView_CreateArray()_GUIDisable()_GUIImageList_SetIconFromHandle()_GUIRegisterMsg()_GUISetIcon()_Icon_Clear()/_Icon_Set()_IdleTime()_InetGet()_InetGetGUI()_InetGetProgress()_IPDetails()_IsFileOlder()_IsGUID()_IsHex()_IsPalindrome()_IsRegKey()_IsStringRegExp()_IsSystemDrive()_IsUPX()_IsValidType()_IsWebColor()_Language()_Log()_MicrosoftInternetConnectivity()_MSDNDataType()_PathFull/GetRelative/Split()_PathSplitEx()_PrintFromArray()_ProgressSetMarquee()_ReDim()_RockPaperScissors()/_RockPaperScissorsLizardSpock()_ScrollingCredits_SelfDelete()_SelfRename()_SelfUpdate()_SendTo()_ShellAll()_ShellFile()_ShellFolder()_SingletonHWID()_SingletonPID()_Startup()_StringCompact()_StringIsValid()_StringRegExpMetaCharacters()_StringReplaceWholeWord()_StringStripChars()_Temperature()_TrialPeriod()_UKToUSDate()/_USToUKDate()_WinAPI_Create_CTL_CODE()_WinAPI_CreateGUID()_WMIDateStringToDate()/_DateToWMIDateString()Au3 script parsingAutoIt SearchAutoIt3 PortableAutoIt3WrapperToPragmaAutoItWinGetTitle()/AutoItWinSetTitle()CodingDirToHTML5FileInstallrFileReadLastChars()GeoIP databaseGUI - Only Close ButtonGUI ExamplesGUICtrlDeleteImage()GUICtrlGetBkColor()GUICtrlGetStyle()GUIEventsGUIGetBkColor()Int_Parse() & Int_TryParse()IsISBN()LockFile()Mapping CtrlIDsOOP in AutoItParseHeadersToSciTE()PasswordValidPasteBinPosts Per DayPreExpandProtect GlobalsQueue()Resource UpdateResourcesExSciTE JumpSettings INISHELLHOOKShunting-YardSignature CreatorStack()Stopwatch()StringAddLF()/StringStripLF()StringEOLToCRLF()VSCROLLWM_COPYDATAMore Examples...

Updated: 22/04/2018

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Good thing I wasnt making a UDF, and only clearly showing concept.  And it gives the correct answer every time in reasonable tests.  Checks are sure in order for exceeding bounds, and  I'm sure in production they would close the handle.

Exit, 

that is more,    _FileReadTheWholeThing_ThenReturnTheLastChars

Edited by boththose

,-. .--. ________ .-. .-. ,---. ,-. .-. .-. .-.
|(| / /\ \ |\ /| |__ __||| | | || .-' | |/ / \ \_/ )/
(_) / /__\ \ |(\ / | )| | | `-' | | `-. | | / __ \ (_)
| | | __ | (_)\/ | (_) | | .-. | | .-' | | \ |__| ) (
| | | | |)| | \ / | | | | | |)| | `--. | |) \ | |
`-' |_| (_) | |\/| | `-' /( (_)/( __.' |((_)-' /(_|
'-' '-' (__) (__) (_) (__)

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What is the advantage of this rather than using the built-in commands?

 

My function (using Win32 API) is the only one which works with old AutoIt 3.2.12.1 which is my main AutoIt's version.

Native FileSetPos() function and even _WinAPI_SetFilePointer() were introduced later.

Edited by Zedna

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