tremolux66

Exclusive file locking - SOLVED

4 posts in this topic

#1 ·  Posted (edited)

I've run into the problem where multiple script processes writing to a log file at the same time can interfere with one another. That is, file writes using FileWriteLine are not atomic, so a line of text from one process can have fragments of text from other processes mixed in with it. Exclusive file-locking should take care of the problem.

Looking through the standard UDFs, I see that _WinAPI_LockFile is available, but according to the MSDN documentation it doesn't block - it returns immediately if the lock can't be obtained - and there doesn't seem to be a UDF for the LockFileEx function. I considered writing my own UDF for LockFileEx, but some aspects (e.g., creating the OVERLAPPED structure and its members) look too complex for the amount of time I have available. I think approximating LockFileEx using LockFile could solve my problem, but I'd like to keep it simple while still working reliably. I'm not confident that (e.g.) a simple retry loop to simulate blocking will be adequate.

Any suggestions for a simple way to achieve exclusive file-locking with blocking?

Edited by tremolux66
Mark problem as solved

When the going gets tough, the tough start coding.

Share this post


Link to post
Share on other sites



this is what you're looking for:

i have used it successfully in a very much similar scenario to yours.

Share this post


Link to post
Share on other sites

#3 ·  Posted (edited)

Thanks, I'll  give that a try!

Edited by tremolux66
Typo

When the going gets tough, the tough start coding.

Share this post


Link to post
Share on other sites

Works great - problem solved! All the log messages are stored perfectly. :)


When the going gets tough, the tough start coding.

Share this post


Link to post
Share on other sites

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!


Register a new account

Sign in

Already have an account? Sign in here.


Sign In Now

  • Similar Content

    • nznet
      By nznet
      Hi Guys,
      I have been trying to write the API calls to Coinigy.com in AutoitScipt. I have managed to solve most of them put are having trouble with the ones that require parameters to be passed.
      The source to the API calls can be found here:
      http://docs.coinigy.apiary.io/#reference/market-data/market-data/data-{type:history}
      Example code from this site:
      curl --include \      --request POST \      --header "Content-Type: application/json" \      --header "X-API-KEY: " \      --header "X-API-SECRET: " \      --data-binary "    {         \"exchange_code\": \"GDAX\",         \"exchange_market\": \"BTC/USD\",         \"type\": \"history\"     }" \ ' https://api.coinigy.com/api/v1/data '  
      This data one is really annoying me. I have the following so far:
      #include <Array.au3> #include <string.au3> #include <MsgBoxConstants.au3> #Region Coinigy Const Global $sCoinigyAPIUrl = "https://api.coinigy.com/api/v1/" #EndRegion Coinigy Const #Region keys Global Const $sCoinigyAPIKey = "" ; just removed my APIKey Global Const $sCoinigyAPISecret = "" ; just removed my APISecret #EndRegion keys $sResults = CoinigyQueryPrivate("data", "exchange_code=GDAX&exchange_market=BTC/USD&type=history") ; Trade history, asks and bids for any supported exchange/market ConsoleWrite("Market Data: " & $sResults & @CRLF & @CRLF) Func CoinigyQueryPrivate($sMethod, $sParameters)     Local $oHTTP = ObjCreate("winhttp.winhttprequest.5.1")     $oHTTP.Open("POST", $sCoinigyAPIUrl & $sMethod, False)     $oHTTP.SetRequestHeader("X-API-KEY", $sCoinigyAPIKey)     $oHTTP.SetRequestHeader("X-API-SECRET", $sCoinigyAPISecret)    ; $oHTTP.Send(Binary($sParameters)) ; tried this as well     $oHTTP.Send($sParameters)     Local $sReceived = $oHTTP.ResponseText     Return $sReceived EndFunc   ;==>CoinigyQueryPrivate  
      If I do other queries that don't require Parameters they work perfectly. I am just totally stumped by the parameter passing queries. I have tried everything and I still can't get it to go. Would really appreciate some help.
      If you want to try for yourself live, Coinigy.com give a free 30 trial.... 
      Please help...
      Thanks in advance.
    • falcontechnics
      By falcontechnics
      Dear master, hello,
      I got the speech API from Google. But I could not find how to use. Could you help me with a simple example?
      "https://speech.googleapis.com/v1/speech:recognize?key=MyKey"
    • rudi
      By rudi
      Hello.
      I'm too stupid to see my mistake:
      To investigate the internal "dictionary" of TIFF files I'd like to read in the files in binary mode and to check, if there are more than one pages "in" this TIFF.
      Notepad++, "View as Hex" is presenting the first bytes as "49 49 2a 20 08 20 20 20 12" for the TIF attached to this posting
      The "TIFF Header Format" is easy:
      Offset 00h, 2 Byte = Byte Order, "II"=intel, "MM"=motorola. (I = 0x49)
      --> II
      Offset 02h, 2 Byte = Version Nr.
      Offset 04h, 4 Byte = pointer to first IFD entry
      Description of TIFF header: https://www.awaresystems.be/imaging/tiff/faq.html#q3
       

      Howto read and analyse the binary content correctly? This is my messy, not operational code:
       
      $sampleTiff="H:\daten\tif\11\11\111111.TIF" $h=FileOpen($sampleTiff,16) $content=FileRead($h) ConsoleWrite('@@ Debug(' & @ScriptLineNumber & ') : $content = ' & $content & @CRLF & '>Error code: ' & @error & @CRLF) ;### Debug Console FileClose($h) $type=VarGetType($content) ConsoleWrite('@@ Debug(' & @ScriptLineNumber & ') : $type = ' & $type & @CRLF & '>Error code: ' & @error & @CRLF) ;### Debug Console $ToString=BinaryToString($content) ConsoleWrite('@@ Debug(' & @ScriptLineNumber & ') : $ToString = ' & $ToString & @CRLF & '>Error code: ' & @error & @CRLF) ;### Debug Console ConsoleWrite(@CRLF & @CRLF) $content=StringTrimLeft($content,2) ; cut off the leading "0x" ConsoleWrite('@@ Debug(' & @ScriptLineNumber & ') : $content = ' & $content & @CRLF & '>Error code: ' & @error & @CRLF) ;### Debug Console for $i = 1 to 8 step 8 $next=StringMid($content,$i,2) ConsoleWrite('@@ Debug(' & @ScriptLineNumber & ') : $next = ' & $next & @CRLF & '>Error code: ' & @error & @CRLF) ;### Debug Console $Chr=BinaryToString($next) ConsoleWrite('@@ Debug(' & @ScriptLineNumber & ') : $Chr = ' & $Chr & @CRLF & '>Error code: ' & @error & @CRLF) ;### Debug Console ConsoleWrite(@CRLF & "---" & @CRLF) Next Regards, Rudi.
      111111.TIF
    • usmiv4o
      By usmiv4o
      #cs ---------------------------------------------------------------------------- AutoIt Version: 3.2.4.3 Author: usmiv4o Script Function: AutoIt script to check if files in directory are changed. It is usefull for security contra-inteligense measures. Function Name: LoadTripwireDB() Description: Loads database (text file tripwire.txt) and compare files in /test folder for changes. compares Hash (MD5) checksums. If they are not the same starts Initial() Function Name: Initial() Description: Checks directory and makes index of files and their MD5 checksums in text file (tripwire.txt) Function Name: Hush() Description: Checks file and returns its MD5 checksum. Requirement(s): Windows XP Return Value(s): On Success - Returns true. Files are the same as before. On Failure - return false. Example: LoadTripwireDB() #ce ---------------------------------------------------------------------------- #include <Crypt.au3> #include <File.au3> #include <Array.au3> $sDir = @ScriptDir & "\Test" $sFilePath = @ScriptDir & "\tripwire.txt" Func Hush(ByRef $sFile) $sRead = FileOpen( $sFile) $dHash = _Crypt_HashData($sRead, $CALG_MD5) ; Create a hash of the text entered. ConsoleWrite("Hash of file " & $sFile & " is " & $dHash & @CRLF) EndFunc ;ConsoleWrite("Files in Dir are " & $aScriptDir[0] & @CRLF) ;$sFilePath = @ScriptDir & "\Examples.txt" ;_FileWriteFromArray($sFilePath, $aScriptDir, 1) ;_ArrayDisplay($aScriptDir, "1D display") Func Initial() $aScriptDir = _FileListToArray($sDir) for $i = 1 To UBound($aScriptDir) - 1 $dHash = _Crypt_HashData($i, $CALG_MD5) ;ConsoleWrite("File " & $aScriptDir[$i] & " is " & $dHash & @CRLF) ConsoleWrite($aScriptDir[$i] & ":" & $dHash & @CRLF) ;Hush($aScriptDir[$i]) ;FileWrite $hFileOpen = FileOpen($sFilePath, $FO_APPEND) If $hFileOpen = -1 Then MsgBox($MB_SYSTEMMODAL, "", "An error occurred when reading the file.") EndIf FileWrite($hFileOpen, $aScriptDir[$i] & ":" & $dHash & @CRLF) Next EndFunc Func Monitor() $aScriptDir = _FileListToArray($sDir) for $i = 1 To UBound($aScriptDir) - 1 Next EndFunc Func LoadTripwireDB() $comparison_ok = false $dArray = _FileListToArray($sDir) ;directory $dArray0 = UBound($dArray) - 1 $fArray = FileReadToArray($sFilePath) ;file $fArray0 = UBound($fArray) ;_ArrayDisplay($dArray, "files array") if $dArray0 = $fArray0 Then ; are file same as recorded in txt file? ;ConsoleWrite("files in monitoring dir: " & $dArray[0] & " = file recorded: " & $fArray0 & @CRLF & $fArray[0]& @CRLF) for $i = 1 To UBound($dArray) - 1 ;ConsoleWrite("i = " & $i & @CRLF) $dHash = _Crypt_HashData($i, $CALG_MD5) ;binary ;$dHash = BinaryToString($dHash) $ffhash = StringSplit( $fArray[$i-1],":") $fhash = $ffhash[2] ;ConsoleWrite("IsBinary $dHash " & IsBinary($dHash) & @CRLF) if $dHash = $fhash Then ;if compared hashes are equal ;ConsoleWrite($fhash & ":" & $dHash & " equal" & @CRLF) ;ConsoleWrite("File: " & $fhash & @CRLF & "Directory: " & $dHash & @CRLF & "equal: yes " & @CRLF) Else ;if compared hashes are not equal ;ConsoleWrite("File: " & $fhash & @CRLF & "Directory: " & $dHash & @CRLF & "equal: not " & @CRLF) ;MsgBox(0,"hash md5",$fhash & ":" & $dHash & " not equal") EndIf Next ;ConsoleWrite("hashes are equal" & @CRLF) $comparison_ok = true Else ConsoleWrite("number of files in monitoring dir are not same as recorded" & @CRLF) ConsoleWrite("directory: " & $dArray[0] &":"& "files: " & UBound($fArray) - 1 & @CRLF) EndIf Return $comparison_ok EndFunc #main if LoadTripwireDB() = true Then ConsoleWrite(" hashes are equal " & @CRLF) ElseIf LoadTripwireDB() <> true Then ConsoleWrite(" hashes are not equal " & @CRLF) ConsoleWrite(" hashes are not equal " & @CRLF) Initial() EndIf  
      tripwire.au3
      tripwire.txt
    • nhardel
      By nhardel
      So I have been bashing my head in for a couple days and have searched both AutoIT forums and Thwack Forums for an answer.  I understand this could be hard to help sense I can't provide a server for someone to help me test against.  I am trying to use the WinHTTP.au3 to connect with Solarwinds Orion SDK thru REST/JSON api calls.  Here is the documentation that they provide.
      https://github.com/solarwinds/OrionSDK/wiki/REST
      I have been trying just to make a basic connection but for some reason cannot get past the authorization process with WinHTTP.  Here is my test code.
      #Region Includes #include <log4a.au3> #include "WinHttp.au3" #EndRegion Global $sAddress = "https://usandl0213:17778/SolarWinds/InformationService/v3/Json/Query?query=SELECT+NodeID+FROM+Orion.NODES" Global $array_URL = _WinHttpCrackUrl($sAddress) ;~ Row|Col 0 ;~ [0]|https ;~ [1]|2 ;~ [2]|usandl0213 ;~ [3]|17778 ;~ [4]| ;~ [5]| ;~ [6]|/SolarWinds/InformationService/v3/Json/Query ;~ [7]|?query=SELECT+NodeID+FROM+Orion.NODES Global $hOpen = _winhttpOpen() If @error Then _log4a_Fatal("Error intializing the usage of WinHTTP functions") Exit 1 EndIf Global $hConnect = _winhttpConnect($hOpen, $array_URL[2]) If @error Then _log4a_Fatal("Error specifying the initial target server of an HTTP request.") _WinHttpCloseHandle($hOpen) Exit 2 EndIf Global $hRequest = _WinHttpOpenRequest($hConnect, _ "GET", _ "/SolarWinds/InformationService/v3/Json/Query?query=SELECT+NodeID+FROM+Orion.NODES", _ "HTTP/1.1") If @error Then _log4a_Fatal(MsgBox(48, "Error", "Error creating an HTTP request handle.") _WinHttpCloseHandle($hConnect) _WinHttpCloseHandle($hOpen) Exit 3 EndIf _WinHttpAddRequestHeaders($hRequest, "Authorization: Basic YXV0b2l0X2xvZ2luOnRlc3Q=") _WinHttpAddRequestHeaders($hRequest, "User-Agent: curl/7.20.0 (i386-pc-win32) libcurl/7.20.0 OpenSSL/0.9.8l zlib/1.2.3") _WinHttpAddRequestHeaders($hRequest, "Host: usandl0213:17778") _WinHttpAddRequestHeaders($hRequest, "Accept: */*") _WinHttpSendRequest($hRequest) If @error Then MsgBox(48, "Error", "Error sending specified request.") Close_request() Exit 4 EndIf ; Wait for the response _WinHttpReceiveResponse($hRequest) If @error Then MsgBox(48, "Error", "Error waiting for the response from the server.") Close_request() Exit 5 EndIf Global $sChunk, $sData ; See what's returned If _WinHttpQueryDataAvailable($hRequest) Then Global $sHeader = _WinHttpQueryHeaders($hRequest) ;~ ConsoleWrite(@crlf) ConsoleWrite($sHeader & @CRLF) ; Read While 1 $sChunk = _WinHttpReadData($hRequest) If @error Then ExitLoop $sData &= $sChunk WEnd ConsoleWrite($sData & @CRLF) ; print to console Else MsgBox(48, "Error", "Site is experiencing problems.") EndIf Close_request() Func Close_request() ; Close open handles and exit _WinHttpCloseHandle($hRequest) _WinHttpCloseHandle($hConnect) _WinHttpCloseHandle($hOpen) EndFunc I am definitely connecting to the server but get a 401 Unauthorized response.  Output of above script:
      Header:
      HTTP/1.1 401 Unauthorized Cache-Control: private Date: Thu, 27 Jul 2017 15:31:21 GMT Content-Length: 1668 Content-Type: text/html; charset=utf-8 Server: Microsoft-IIS/7.5 Set-Cookie: ASP.NET_SessionId=lgwin2qsbbrip2mxg01fot05; path=/; HttpOnly Set-Cookie: TestCookieSupport=Supported; path=/ Set-Cookie: Orion_IsSessionExp=TRUE; expires=Thu, 27-Jul-2017 17:31:21 GMT; path=/ WWW-Authenticate: Negotiate WWW-Authenticate: NTLM X-UA-Compatible: IE=9 X-AspNet-Version: 4.0.30319 X-Powered-By: ASP.NET X-Same-Domain: 1 X-Content-Type-Options: nosniff X-Frame-Options: SAMEORIGIN X-XSS-Protection: 1; mode=block Body:
      <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> <html xmlns="http://www.w3.org/1999/xhtml"> <head><link rel="stylesheet" type="text/css" href="/orion/js/jquery-1.7.1/jquery-ui.css.i18n.ashx?l=en-US&v=42660.90.L&csd=%23b0b9c5;%23d2ddec;%2392add1;" /> <link rel="stylesheet" type="text/css" href="/orion/styles/orionminreqs.css.i18n.ashx?l=en-US&v=42660.90.L&csd=%23b0b9c5;%23d2ddec;%2392add1;" /> <link rel="stylesheet" type="text/css" href="/webengine/resources/steelblue.css.i18n.ashx?l=en-US&v=42660.90.L&csd=%23b0b9c5;%23d2ddec;%2392add1;" /> <link rel="stylesheet" type="text/css" href="/orion/ipam/res/css/sw-events.css.i18n.ashx?l=en-US&v=42660.90.L&csd=%23b0b9c5;%23d2ddec;%2392add1;" /> <script type="text/javascript" src="/orion/js/orionminreqs.js.i18n.ashx?l=en-US&v=42660.90.L"></script> <script type="text/javascript" src="/orion/js/modernizr/modernizr-2.5.3.js.i18n.ashx?l=en-US&v=42660.90.L"></script> <script type="text/javascript" src="/orion/js/jquery-1.7.1/jquery-1.7.1.framework.min.js.i18n.ashx?l=en-US&v=42660.90.L"></script> <script type="text/javascript">(function(){var de=$(document.documentElement); de.addClass('sw-is-locale-en'); $.each(jQuery.browser,function(k,v){if(v===true){ de.addClass('sw-is-'+k); de.addClass('sw-is-'+k+'-'+parseInt(jQuery.browser.version)); }}); })();</script> <script type="text/javascript">SW.Core.Loader._cbLoaded('jquery');</script> <script type="text/javascript">SW.Core.Date._init(0,-14400000);</script> <title> </title></head> <body> <script> window.location = 'Login.aspx'; </script> </body> </html> To me this looks like it if it is still looking for my credentials.   I did verify that things work as expected using Chrome and REST test client.  I do get certificate errors in IE if I try to go directly.  Bypass certificate issues and page will try to save out to .json file
       
      Looking for any help.