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• How to use a specific PDF IFilter

  - by dthrasher

  I'm trying to extract text from PDF files using an iFilter. The Adobe PDF iFilter that is distributed with Adobe Reader is awful, returning HRESULT E_FAIL messages for many PDF documents. The FoxIt PDF IFilter works beautifully on virtually all of the PDFs I've been using for testing. The problem is that every time the Adobe Updater runs, it replaces the awesome FoxIt IFilter with the crappy Adobe IFilter. I've been using the LoadIFilter method to get the registered IFilter for PDF files. Is there a way to force the Win32 API to load the FoxIt IFilter instead of the Adobe IFilter? NOTE: This question about determining which IFilters are installed asks a related -- but not identical -- question.

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• Is there a python openid apps-discovery library to get appengine apps onto the apps marketplace

  - by molicule

  I'm looking for info on howto get a google appengine app onto the newly announced google apps marketplace. The page at http://code.google.com/googleapps/marketplace/sso.html does not have a python openid apps-discovery library which seems to be the stumbling block. Has anyone ported an appengine app to the marketplace? or know of the existence of a python openid apps-discovery library? or have a timeline on this? updated: please see comment re: standard python openid library vs library that supports "apps-discovery" updated: apparently it is not currently possible, however it will be soon see http://www.google.com/support/forum/p/apps-apis/thread?tid=52e36f012c2436c3&hl=en

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• SmartGWT - Appengine - 404 not found

  - by badcluster

  Im using smartGWT v2.1 with GWT 2 and Appengine SDK 1.3.0 On localhost, everything works fine! When I deploy everything goes fine too, without any error! The problem is, when i access the the app it returns an blank screen. Using the firebug i saw just nocache.js missing. ErrorLog: GET mika.nocache.js http://perfworker.appspot.com/Mika/mika.nocache.js 404 Not Found perfworker.appspot.com Just to know, the last version of smartGWT should work on AppEngine out of the box? Thanks in advance! Cleber

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• Looking for more details about "Group varint encoding/decoding" presented in Jeff's slides

  - by Mickey Shine

  I noticed that in Jeff's slides "Challenges in Building Large-Scale Information Retrieval Systems", which can also be downloaded here: http://research.google.com/people/jeff/WSDM09-keynote.pdf, a method of integers compression called "group varint encoding" was mentioned. It was said much faster than 7 bits per byte integer encoding (2X more). I am very interested in this and looking for an implementation of this, or any more details that could help me implement this by myself. I am not a pro and new to this, and any help is welcome!

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• GAE/Django Templates (0.96) filters to get LENGTH of GqlQuery and filter it

  - by Halst

  I pass the query with comments to my template: COMM = CommentModel.gql("ORDER BY created") doRender(self,CP.template,{'CP':CP,'COMM':COMM, 'authorize':authorize()}) And I want to output the number of comments as a result, and I try to do things like that: <a href="...">{{ COMM|length }} comments</a> Thats does not work (yeah, since COMM is GqlQuery, not a list). What can I do with that? Is there a way to convert GqlQuery to list or is there another solution? (first question) Second question is, how to filter this list in template? Is there a construct like this: <a href="...">{{ COMM|where(reference=smth)|length }} comments</a> so that I can get not only the number of all comments, but only comments with certain db.ReferenceProperty() property, for example. Last question: is it weird to do such things using templates?

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• Easiest way to export a route stored in a SQLite database to a file so it can be imported to a Googl

  - by LordSnoutimus

  Hello, I have created an application that records a series of longitude and latitude values in a SQLite database and display them as a coloured track on a MapActivity. I now want to be able to export this data somehow (preferably to a file) so a user can upload the values to a website showing a Google Map API. My question is: what would be the quickest way to export the data (and in what file format: GPX, XML, CSV) to the SD card located on the Android device. Many thanks.

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• Liferay 5.1.1 solr plugin ClassCastException

  - by Mustafa Zidan

  solr-pulgin throw the following exception [SolrIndexSearcherImpl:79] Error while sending request to Solr java.lang.ClassCastException: com.liferay.portal.kernel.util.HttpUtil cannot be cast to com.liferay.portal.kernel.util.HttpUtil at com.liferay.portal.kernel.util.HttpUtil._getUtil(HttpUtil.java:317) at com.liferay.portal.kernel.util.HttpUtil.getHttp(HttpUtil.java:96) at com.liferay.portal.kernel.util.HttpUtil.addParameter(HttpUtil.java:68) at com.liferay.portal.search.solr.SolrIndexSearcherImpl.search(SolrIndexSearcherImpl.java:71) at com.liferay.portal.search.solr.SolrSearchEngineUtil.search(SolrSearchEngineUtil.java:78) at com.liferay.portal.search.solr.messaging.SolrReaderMessageListener.doCommandSearch(SolrReaderMessageListener.java:92) at com.liferay.portal.search.solr.messaging.SolrReaderMessageListener.doReceive(SolrReaderMessageListener.java:75) at com.liferay.portal.search.solr.messaging.SolrReaderMessageListener.receive(SolrReaderMessageListener.java:46) at com.liferay.portal.kernel.messaging.InvokerMessageListener.receive(InvokerMessageListener.java:69) at com.liferay.portal.kernel.messaging.ParallelDestination$1.run(ParallelDestination.java:59) at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:886) at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:908) at java.lang.Thread.run(Thread.java:619) 16:08:16,174 ERROR [SolrReaderMessageListener:49] Unable to process message com.liferay.portal.kernel.messaging.Message@2c591d98 com.liferay.portal.kernel.search.SearchException: java.lang.ClassCastException: com.liferay.portal.kernel.util.HttpUtil cannot be cast to com.liferay.portal.kernel.util.HttpUtil at com.liferay.portal.search.solr.SolrIndexSearcherImpl.search(SolrIndexSearcherImpl.java:81) at com.liferay.portal.search.solr.SolrSearchEngineUtil.search(SolrSearchEngineUtil.java:78) at com.liferay.portal.search.solr.messaging.SolrReaderMessageListener.doCommandSearch(SolrReaderMessageListener.java:92) at com.liferay.portal.search.solr.messaging.SolrReaderMessageListener.doReceive(SolrReaderMessageListener.java:75) at com.liferay.portal.search.solr.messaging.SolrReaderMessageListener.receive(SolrReaderMessageListener.java:46) at com.liferay.portal.kernel.messaging.InvokerMessageListener.receive(InvokerMessageListener.java:69) at com.liferay.portal.kernel.messaging.ParallelDestination$1.run(ParallelDestination.java:59) at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:886) at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:908) can anyone help me on this

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• Google appengine authentication on iPhone web app on the home screen

  - by Rakesh Pai

  I'm using Google appengine for developing an web application that is meant to be used on both the browser and iphone. I have purchased a domain name for this application, so that I have a pretty URL. I've used the User API for authentication. This works just fine on desktop browsers and iPhone Safari. The user could add the application to the home screen (by tapping the "+" at the bottom toolbar). However when that's done, it seems like the cookies set by Google are not in affect within this "application", and the user is effectively logged out. To make matters worse, when the user clicks on the login link (as generated by GAE), the app closes and opens safari to complete the login. Since the session is apparently not shared between the two, the login process is futile, and the "home-screen" version of the app continues to be logged out. It seems that the cookies are not shared between a "home-screen" app and Safari. It also seems that the "home-screen" app will only work within it's own domain, and any redirect to any other domain will open Safari. Any idea how I can go about fixing this?

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• Cheetah with Cherrypy: how to load base templates, and do so automatically on change during developm

  - by Heikki Toivonen

  I am working on a cherrypy+cheetah app and would like to improve the development experience. I have everything working when I manually compile templates beforehand. However, during development I'd rather just load the templates every time they are referenced so that I don't need to kill and restart my application. I have a couple of issues I am facing: If I have templates inheriting from base templates, I get import errors (can't find base templates). I think I had this actually working during my experiments, but unfortunately didn't save it and now I can't make it work. Suppose I get 1. working, how do make it so that edits even in base templates get picked up without restart. Below is my sample application that should demonstrate the problems. The directory structure is as follows: t.py templates/ base.tmpl index.tmpl t.py: import sys import cherrypy from Cheetah.Template import Template class T: def __init__(self, foo): self.foo = foo @cherrypy.expose def index(self): return Template(file='templates/index.tmpl', searchList=[{'foo': self.foo}]).respond() cherrypy.quickstart(T(sys.argv[1])) base.tmpl: #def body This is the body from the base #end def This is the base doc index.tmpl: #from templates.base import base #extends base #def body $base.body(self) This is the extended body #end def This is from index Run it like this: python t.py Something

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• GQL query help - How can I write a query with where clause in GQL ? I am using google appengine data

  - by srivigneshwar

  I have three records in a table example: *Usernames* *email* *city* Nick [email protected] London Vikky [email protected] Paris Lisa [email protected] Sydney Now I want to get specific record keeping email ID as a key , SQL query may be like this select * from table1 where email = "[email protected]" What is the equivalent GQL query for the above ??

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• Auto increment column i JDO, GAE

  - by Viktor

  Hi, I have a data class with some fields, one is a URL that I consider the PK, if I add a new item (do a new sync) and save it it should overwrite the item in the database if it's the same URL. But I also need a "normal" Long id that is incremented for every object in the database and for this one I always get null unless I tags it as a PK, how can a get this incrementation but not have the column as my PK? @Persistent(valueStrategy=IdGeneratorStrategy.IDENTITY) private Long _id; @Persistent private String _title; @PrimaryKey @Persistent private String _url; /Viktor

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• Compass Autocomplete to only return index words

  - by tariqj

  I am currently trying to configure a compass query for autocomplete. I have it working so that the compass query will return an object. I would like to modify it so that it will return matching words in the index, not matching results. Thanks.

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• Is there any super fast algorithm for finding LINES on picture?

  - by Ole Jak

  So I have Image like this I need some super fast algorithm for finding all straight lines on it. I want to give to algorithm parameters like min length and max line distortion. I want to get relative to picture pixel coords start and end points of lines. So on this picture to find all lines between dalles and thouse 2 black lines on top. So I need algorithm for super fast finding straight lines of different colors on picture. Is there any such algorithm? (super duper fast=)

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• Searching a large list of words in another large list

  - by Christian

  I have a list of 1,000,000 strings with a maximum length of 256 with protein names. Every string has an associated ID. I have another list of 4,000,000,000 strings with a maximum length of 256 with words out of articles and every word has an ID. I want to find all matches between the list of protein names and the list of words of the articles. Which algorithm should I use? Should I use some prebuild API? It would be good if the algorithm runs on a normal PC without special hardware.

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• User management for google apps

  - by Ali

  Hi guys, I'm modifying our collaboration system so it can be listed on google applications. A small issue I'm facing is the registering of user details. By default whenever someone logs into their google Apps account they pretty much are logged into the application. For every action taken by a registered login in user I store the user ID of that signed in user whenever an update is made in the database. However the google apps user sign in process is different in this respect that there isn't anything visible as a user ID for me to work with. Any ideas?

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• script to search and replace deprecated functions

  - by user573881

  Hi, I am using the following script to search and replace the deprecated functions in a file with the newer ones. 5 for strFile in `ls deprecated_functions_search_and_replace.txt ` 6 do 7 sed "s/ereg_replace[^\(]*(\([^,]*\),/preg_replace\1('#'.\2.'#',/g" $strFile > temp_file 8 mv $strFile $strFile".bakup" 9 mv temp_file $strFile 10 11 sed "s/eregi[^\(]*(\([^,]*\),/preg_match\1('#'.\2.'#i',/g" $strFile > temp_file 12 mv $strFile $strFile".bakup" 13 mv temp_file $strFile 14 15 sed "s/ereg[^\(]*(\([^,]*\),/preg_match\1('#'.\2.'#',/g" $strFile > temp_file 16 mv $strFile $strFile".bakup" 17 mv temp_file $strFile 18 19 sed "s/split[^\(]*(\([^,]*\),/preg_split\1('#'.\2.'#',/g" $strFile > temp_file 20 mv $strFile $strFile".bakup" 21 mv temp_file $strFile 22 23 sed "s/mysql_escape_string/mysql_real_escape_string/g" $strFile > temp_file 24 mv $strFile $strFile".bakup" 25 mv temp_file $strFile 26 27 sed "s/set_magic_quotes_runtime(0)/\/\/set_magic_quotes_runtime(0)/g" $strFile > temp_file 28 mv $strFile $strFile".bakup" 29 mv temp_file $strFile 30 31 sed "s/ini_get('safe_mode')/false/g" $strFile > temp_file 32 mv $strFile $strFile".bakup" 33 mv temp_file $strFile 34 35 sed "s/session_register('\(.*\)')/$_SESSION['\1']=$\1/g" $strFile > temp_file 36 mv $strFile $strFile".bakup" 37 mv temp_file $strFile 38 39 sed "s/session_unregister('\(.*\)')/$_SESSION['\1']=''/g" $strFile > temp_file 40 mv $strFile $strFile".bakup" 41 mv temp_file $strFile 42 43 done However, when I run this script I am getting an error saying: sed: -e expression #1, char 60: invalid reference \2 on `s' command's RHS sed: -e expression #1, char 52: invalid reference \2 on `s' command's RHS sed: -e expression #1, char 50: invalid reference \2 on `s' command's RHS sed: -e expression #1, char 51: invalid reference \2 on `s' command's RHS I am unable to figure out whats going wrong. Someone please help me. Regards.

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• XMPP/jabber client help

  - by akshay

  I want to develop a chat application with floowing features 1)user A visits website clinks on chat . 2)Website picks another user B who is single(who is not paired) and pairs him with A. 3)Now A and B can chat till they want. Now here neight A or B are registered member of website.Neight they ave any accouunt. Can i develop such things using jabber/XMPP on appengine ??If yes how??please provide some pointers so that i can start off.

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• Spring GAE/J Could Not find API version error

  - by Julie Paltrow

  Hello, I am trying to use Spring MVC 3 on GAE/J and I got this error and I do not know what it means, does anybody have an idea and perhaps give me pointers on how to fix this? May 21, 2010 9:50:23 AM com.google.appengine.tools.info.LocalVersionFactory getVersion INFO: Could not find API version from /opt/home/me/workspace/SpringMVC/war/WEB-INF/lib/.svn java.util.zip.ZipException: error in opening zip file at java.util.zip.ZipFile.open(Native Method) at java.util.zip.ZipFile.<init>(ZipFile.java:114) at java.util.jar.JarFile.<init>(JarFile.java:133) at java.util.jar.JarFile.<init>(JarFile.java:97) at com.google.appengine.tools.util.ApiVersionFinder.findApiVersion(ApiVersionFinder.java:37) at com.google.appengine.tools.info.LocalVersionFactory.getVersion(LocalVersionFactory.java:65) at com.google.appengine.tools.info.UpdateCheck.getLocalVersion(UpdateCheck.java:112) at com.google.appengine.tools.info.UpdateCheck.checkForUpdates(UpdateCheck.java:91) at com.google.appengine.tools.info.UpdateCheck.doNagScreen(UpdateCheck.java:164) at com.google.appengine.tools.info.UpdateCheck.maybePrintNagScreen(UpdateCheck.java:132) at com.google.appengine.tools.development.DevAppServerMain$StartAction.apply(DevAppServerMain.java:150) at com.google.appengine.tools.util.Parser$ParseResult.applyArgs(Parser.java:48) at com.google.appengine.tools.development.DevAppServerMain.<init>(DevAppServerMain.java:113) at com.google.appengine.tools.development.DevAppServerMain.main(DevAppServerMain.java:89)

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• Java Appengine APPSTATS causing java out of memory error

  - by aloo

  I have several servlets in my java appengine app that do in memory sorting and take on the order of seconds to complete. These complete error free. However, I recently enabled appstats for appengine and started receiving the following error: java.lang.OutOfMemoryError: Java heap space at java.util.Arrays.copyOf(Unknown Source) at java.lang.AbstractStringBuilder.expandCapacity(Unknown Source) at java.lang.AbstractStringBuilder.append(Unknown Source) at java.lang.StringBuilder.append(Unknown Source) at java.lang.StringBuilder.append(Unknown Source) at java.lang.StringBuilder.append(Unknown Source) at com.google.appengine.repackaged.com.google.protobuf.TextFormat$TextGenerator.write(TextFormat.java:344) at com.google.appengine.repackaged.com.google.protobuf.TextFormat$TextGenerator.print(TextFormat.java:332) at com.google.appengine.repackaged.com.google.protobuf.TextFormat.printUnknownFields(TextFormat.java:249) at com.google.appengine.repackaged.com.google.protobuf.TextFormat.print(TextFormat.java:47) at com.google.appengine.repackaged.com.google.protobuf.TextFormat.printToString(TextFormat.java:73) at com.google.appengine.tools.appstats.Recorder.makeSummary(Recorder.java:157) at com.google.appengine.tools.appstats.Recorder.makeSyncCall(Recorder.java:239) at com.google.apphosting.api.ApiProxy.makeSyncCall(ApiProxy.java:98) at com.google.appengine.api.datastore.DatastoreApiHelper.makeSyncCall(DatastoreApiHelper.java:54) at com.google.appengine.api.datastore.PreparedQueryImpl.runQuery(PreparedQueryImpl.java:127) at com.google.appengine.api.datastore.PreparedQueryImpl.asQueryResultList(PreparedQueryImpl.java:81) at org.datanucleus.store.appengine.query.DatastoreQuery.fulfillEntityQuery(DatastoreQuery.java:379) at org.datanucleus.store.appengine.query.DatastoreQuery.executeQuery(DatastoreQuery.java:289) at org.datanucleus.store.appengine.query.DatastoreQuery.performExecute(DatastoreQuery.java:239) at org.datanucleus.store.appengine.query.JDOQLQuery.performExecute(JDOQLQuery.java:89) at org.datanucleus.store.query.Query.executeQuery(Query.java:1489) at org.datanucleus.store.query.Query.executeWithArray(Query.java:1371) at org.datanucleus.jdo.JDOQuery.execute(JDOQuery.java:243) at com.poo.pooserver.dataaccess.DataAccessHelper.getPooStream(DataAccessHelper.java:204) at com.poo.pooserver.GetPooStreamServlet.doPost(GetPooStreamServlet.java:58) at javax.servlet.http.HttpServlet.service(HttpServlet.java:713) at javax.servlet.http.HttpServlet.service(HttpServlet.java:806) at org.mortbay.jetty.servlet.ServletHolder.handle(ServletHolder.java:511) at org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1166) at com.google.appengine.tools.appstats.AppstatsFilter.doFilter(AppstatsFilter.java:92) at org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1157)

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• GAE/JDO: How to check whether a field in a detached object was loaded

  - by tempy

  My DAO detaches and then caches certain objects, and it may retrieve them with different fetch groups. Depending on which fetch group was used to retrieve the object, certain fields of that object may be available, or not. I would like to be able to test whether a given field on that object was loaded or not, but I can't simply check whether the field is null because that results in a "JDODetachedFieldAccessException" which demands that I either not access the field or add detach the field first. I could always catch that exception, but that doesn't smell right. So, does anyone know whether its possible to check if the field was detached?

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• Application development using google applications?

  - by Ali

  Hi guys I'm developing a collaboration system and our team has been at it for the past couple of years. However the boss suggested that we try and redevelop it using something robust. Basically our collaboration system incorporates a webmail client and a custom built contacts management system plus project management system. My boss likes the robustness of GMAIL and Google docs and really would like a solution that if possible could incorporate these two and other google applications - I'm not so sure how to get started on developing a custom application using google applications - especially consider the fact that in the long run we wish to host our collaboration system as a paid service - just like the services that 37signals basecamp and highrise have been.

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• Javascript crazy idea finding a node

  - by Louis

  I had a crazy (but so crazy that it just might work) idea where every element on a page is created in javascript but given an ID which is a hash of its path in the DOM. So instead of searching through the DOM to find an element, you hash the path and then getElementById() with that hash. Problem with this is getting the path might be more expensive than searching the DOM in the first place. Any ideas how this could be done or if it is just plain stupid?

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• Filter rows on the basis of "First Name" + "Last Name" in SQL

  - by Raghav Khunger

  Hi, I have a user table in my database which contains two columns FirstName and LastName. Now in my front end there is a textbox to filter out the users from this table. Let's suppose I am taking that input from the front end in the form of a input parameter "@SEARCHKEYWORD". I have created a sample below: DECLARE @Test TABLE ([ID] INT IDENTITY, [FNAME] NVARCHAR(100), [LNAME] NVARCHAR(100) ) INSERT INTO @Test( FNAME, LNAME ) SELECT 'John','Resig' UNION ALL SELECT 'Dave','Ward' UNION ALL SELECT 'Peter','Smith' UNION ALL SELECT 'Dave','Smith' UNION ALL SELECT 'Girija','Acharya' UNION ALL SELECT 'Devendra', 'Gujel' UNION ALL SELECT 'Arjit', 'Gupta' DECLARE @SEARCHKEYWORD NVARCHAR(100) SELECT * FROM @Test WHERE FNAME +' '+ LNAME LIKE @SEARCHKEYWORD i.e. so far I have thought of this query to filter out the rows but it is not giving the desired results: SELECT * FROM @Test WHERE FNAME +' '+ LNAME LIKE @SEARCHKEYWORD Here are the desired outputs which I needed for the inputs mentioned below: --WHEN @SEARCHKEYWORD='John Resig' --Desired OUTPUT: the row which contains 'John','Resig' --WHEN @SEARCHKEYWORD='Ac' --Desired OUTPUT: the row which contains 'Girija','Acharya' --WHEN @SEARCHKEYWORD='Smith' --Desired OUTPUT: the row which contains 'Peter','Smith' and 'Dave','Smith' --WHEN @SEARCHKEYWORD='g' --Desired OUTPUT: the row which contains 'Devendra', 'Gujel' and 'Arjit', 'Gupta' --WHEN @SEARCHKEYWORD='Smith' --Desired OUTPUT: the row which contains 'Peter','Smith' and 'Dave','Smith'

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• appstats broken filename in callstack

  - by Ray Yun

  When I visit appstats page and expand callstack, the file path has <path[N]> prefix. So click the file link then emit no such file or directory error. Stack: /google/appengine/datastore/datastore_rpc.py:951 make_rpc_call() /google/appengine/datastore/datastore_query.py:993 _make_query_result_rpc_call() /google/appengine/datastore/datastore_query.py:714 run_async() /google/appengine/datastore/datastore_query.py:685 run() /google/appengine/api/datastore.py:1281 GetBatcher() /google/appengine/api/datastore.py:1351 Get() /google/appengine/ext/db/init.py:1831 fetch() /google/appengine/ext/db/init.py:1778 get() /apps/fbapp/fbutil.py:232 oauth_load_fb_user() /apps/fbapp/fbutil.py:84 require_account() the error message for appengine source: [Errno 2] No such file or directory: u'/Applications/GoogleAppEngineLauncher.app/Contents/Resources/GoogleAppEngine-default.bundle/Contents/Resources/google_appengine/lib/ipaddr/google/appengine/datastore/datastore_rpc.py' the error message for my source: IOError [Errno 2] No such file or directory: u'/Applications/GoogleAppEngineLauncher.app/Contents/Resources/GoogleAppEngine-default.bundle/Contents/Resources/google_appengine/lib/antlr3/apps/fbapp/fbutil.py' I guess this was path problem and found some official comment from google. If your request handlers modify sys.path, you must make the same modifications to sys.path in appengine_config.py so the Appstats web interface can see all files. Actually I'm using appengine_django and two path was inserted to sys.path. I did it same again at appengine_django.py but also failed. Maybe some custom setting with appengine_config.py can solve this problem but doesn't figure out how to fix it. What can I do?

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• Scheme Depth-first search of a graph function

  - by John Retallack

  This is a homework question,I'm trying to do a Depth-first search function in Scheme,Here's the code I've written so far: (define explore (?(node visited) (let* ([neighbors (force (cdr node))] [next (nextNode visited neighbors)] [is-visited (member? node visited)]) (cond ;if I have no unvisited neighbours print current node and go up one level [(equal? next #f) (begin (display (car node)) (display " "))] ;if current node is not visited and I have unvisited neighbors ;print current node,mark as visited and visit it's neighbors [(and (equal? is-visited #f) (not (equal? next #f))) (begin (display (car node)) (display " ") (explore next (cons node visited)))]) ;go and visit the next neighbor (if (not (equal? (nextNode (cons next visited) neighbors) #f )) (explore (nextNode (cons next visited) neighbors) (cons node visited)))))) 'node' is the current node 'visited' is a list in witch I keep track of the nodes I visited 'nextNode' is a function that returns the first unvisited neighbor if any or #f otherwise 'member?' test's if a node is in the visited list The Graph representation is using adjacent made using references to nodes with letrec so that's why I use force in 'neighbors': Eg: (letrec ([node1 (list "NY" (delay (list node2 node3)))],where node2 and node3 are defined as node1 The problem witch I'm dealing with is that my visited lists looses track of some of the nodes I visited when I come out of recursion,How can I fix this ?

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