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  • Delphi, What do I do about "no GetEnumerator present" error when using a for loop over Excel Interop

    - by Ryan
    Hello, I'm trying to write a Delphi program that will loop through each worksheet in an Excel file and format some cells. I'm receiving an error while trying to use the for-in loop over the Workbook.Worksheets collection, though. The error is specifically: [DCC Error] Office.pas(36): E2431 for-in statement cannot operate on collection type 'Sheets' because 'Sheets' does not contain a member for 'GetEnumerator', or it is inaccessible The line of code this occurs for is: for Worksheet in Workbook.Worksheets do The definition of Worksheet and Workbook is as follows: var ExcelApp: ExcelApplication; var Workbook: ExcelWorkbook; var Worksheet: ExcelWorksheet; I'm porting this code to Delphi from C#, in which it works. Does anyone know why I'd be getting this GetEnumerator error? I'm using the Office 2007 Excel Interop file and Embarcadero® Delphi® 2010 Version 14.0.3593.25826. Thanks in advance.

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  • Music and Mathematics. Finding the natural scale matemathically. Is this correct?

    - by Alfonso de la Osa
    Hi! I wrote this post Music and Mathematics, finding the Natural and the Pentathonic scales. Central A at 383,56661 Hz. Is a method to find the Natural scale. I want to discuss it and find if its true. This is the code of the reasoning in js. <script> var c = 1.714285714285714; var tot = 0; var scale = []; while(tot < (14 - c)){ tot += c; scale.push(Math.round(tot)); } if(scale.length == 8){ document.write(scale + " " + c + "<br />"); } </script>

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  • Modifying NSDate to represent 1 month from today

    - by bmalicoat
    I'm adding repeating events to a Cocoa app I'm working on. I have repeat every day and week fine because I can define these mathematically (3600*24*7 = 1 week). I use the following code to modify the date: [NSDate dateWithTimeIntervalSinceNow:(3600*24*7*(weeks))] I know how many months have passed since the event was repeated but I can't figure out how to make an NSDate object that represents 1 month/3 months/6 months/9 months into the future. Ideally I want the user to say repeat monthly starting Oct. 14 and it will repeat the 14th of every month.

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  • ftp connection problem, vsftp server, active mode

    - by Mark Szente
    I have a server that runs vsftpd to handle ftp connections. One of my users have a notebook with Total Commander and WinSCP installed. Both ftp clients fail right after the connection is established to the server and it tries to download the directory listing with the following error message: Timeout detected. Could not retrieve directory listing PORT command successful. Consider using PASV. Error listing directory '/'. The weird thing is: the notebook works perfectly ok with other ftp servers. My ftp server also works well with other clients. In fact, this user also has a pc running on the same LAN as the notebook and the pc works well with the ftp server. We use PORT ftp connection mode. Passive mode works well but is not an option at this point. I would post more technical details but I don't even know what this problem is related to. Anyway, below is the server side tcpdump for the failed connection attempt. There's no further communication between the client and the server after the last line of log. Thank you very much for any hint! 23:39:24.514852 IP 62.201.xx.xx.2241 > 195.70.xx.xx.21: S 1314489715:1314489715(0) win 65535 <mss 1460,nop,wscale 3,nop,nop,sackOK> 23:39:24.514896 IP 195.70.xx.xx.21 > 62.201.xx.xx.2241: S 2633658883:2633658883(0) ack 1314489716 win 5840 <mss 1460,nop,nop,sackOK,nop,wscale 2> 23:39:24.520842 IP 62.201.xx.xx.2241 > 195.70.xx.xx.21: . ack 1 win 62500 23:39:24.523803 IP 195.70.xx.xx.21 > 62.201.xx.xx.2241: P 1:21(20) ack 1 win 1460 23:39:24.546858 IP 62.201.xx.xx.2241 > 195.70.xx.xx.21: P 1:15(14) ack 21 win 62497 23:39:24.546902 IP 195.70.xx.xx.21 > 62.201.xx.xx.2241: . ack 15 win 1460 23:39:24.547247 IP 195.70.xx.xx.21 > 62.201.xx.xx.2241: P 21:55(34) ack 15 win 1460 23:39:24.762806 IP 62.201.xx.xx.2241 > 195.70.xx.xx.21: . ack 55 win 62493 23:39:30.415011 IP 62.201.xx.xx.2241 > 195.70.xx.xx.21: P 15:28(13) ack 55 win 62493 23:39:30.454116 IP 195.70.xx.xx.21 > 62.201.xx.xx.2241: . ack 28 win 1460 23:39:31.036283 IP 195.70.xx.xx.21 > 62.201.xx.xx.2241: P 55:78(23) ack 28 win 1460 23:39:31.053018 IP 62.201.xx.xx.2241 > 195.70.xx.xx.21: P 28:34(6) ack 78 win 62490 23:39:31.053042 IP 195.70.xx.xx.21 > 62.201.xx.xx.2241: . ack 34 win 1460 23:39:31.053268 IP 195.70.xx.xx.21 > 62.201.xx.xx.2241: P 78:97(19) ack 34 win 1460 23:39:31.068969 IP 62.201.xx.xx.2241 > 195.70.xx.xx.21: P 34:40(6) ack 97 win 62488 23:39:31.069148 IP 195.70.xx.xx.21 > 62.201.xx.xx.2241: P 97:112(15) ack 40 win 1460 23:39:31.069179 IP 195.70.xx.xx.21 > 62.201.xx.xx.2241: P 112:119(7) ack 40 win 1460 23:39:31.076981 IP 62.201.xx.xx.2241 > 195.70.xx.xx.21: . ack 119 win 62485 23:39:31.077010 IP 195.70.xx.xx.21 > 62.201.xx.xx.2241: P 119:177(58) ack 40 win 1460 23:39:31.114979 IP 62.201.xx.xx.2241 > 195.70.xx.xx.21: P 40:45(5) ack 177 win 62478 23:39:31.115164 IP 195.70.xx.xx.21 > 62.201.xx.xx.2241: P 177:186(9) ack 45 win 1460 23:39:31.180966 IP 62.201.xx.xx.2241 > 195.70.xx.xx.21: P 45:53(8) ack 186 win 62476 23:39:31.181066 IP 195.70.xx.xx.21 > 62.201.xx.xx.2241: P 186:216(30) ack 53 win 1460 23:39:31.213065 IP 62.201.xx.xx.2241 > 195.70.xx.xx.21: P 53:80(27) ack 216 win 62473 23:39:31.213180 IP 195.70.xx.xx.21 > 62.201.xx.xx.2241: P 216:267(51) ack 80 win 1460 23:39:31.251086 IP 62.201.xx.xx.2241 > 195.70.xx.xx.21: P 80:86(6) ack 267 win 62466 23:39:31.251498 IP 195.70.xx.xx.20 > 62.201.xx.xx.5001: S 2640780713:2640780713(0) win 5840 <mss 1460,sackOK,timestamp 2054371220 0,nop,wscale 2> 23:39:31.290979 IP 195.70.xx.xx.21 > 62.201.xx.xx.2241: . ack 86 win 1460 23:39:34.251489 IP 195.70.xx.xx.20 > 62.201.xx.xx.5001: S 2640780713:2640780713(0) win 5840 <mss 1460,sackOK,timestamp 2054374220 0,nop,wscale 2> 23:39:40.249625 IP 195.70.xx.xx.20 > 62.201.xx.xx.5001: S 2640780713:2640780713(0) win 5840 <mss 1460,sackOK,timestamp 2054380220 0,nop,wscale 2> 23:39:43.695108 IP 195.70.xx.xx.21 > 62.201.xx.xx.1057: P 2280716551:2280716588(37) ack 3838413728 win 5840 23:39:52.248791 IP 195.70.xx.xx.20 > 62.201.xx.xx.5001: S 2640780713:2640780713(0) win 5840 <mss 1460,sackOK,timestamp 2054392220 0,nop,wscale 2> 23:40:16.245159 IP 195.70.xx.xx.20 > 62.201.xx.xx.5001: S 2640780713:2640780713(0) win 5840 <mss 1460,sackOK,timestamp 2054416221 0,nop,wscale 2> 23:40:29.853685 IP 195.70.xx.xx.21 > 62.201.xx.xx.1057: FP 37:51(14) ack 1 win 5840 23:40:31.241951 IP 195.70.xx.xx.21 > 62.201.xx.xx.2241: P 267:304(37) ack 86 win 1460 23:40:31.381708 IP 62.201.xx.xx.2241 > 195.70.xx.xx.21: . ack 304 win 62462

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  • How do I initialize attributes when I instantiate objects in Rails?

    - by nfm
    Clients have many Invoices. Invoices have a number attribute that I want to initialize by incrementing the client's previous invoice number. For example: @client = Client.find(1) @client.last_invoice_number > 14 @invoice = @client.invoices.build @invoice.number > 15 I want to get this functionality into my Invoice model, but I'm not sure how to. Here's what I'm imagining the code to be like: class Invoice < ActiveRecord::Base ... def initialize(attributes = {}) client = Client.find(attributes[:client_id]) attributes[:number] = client.last_invoice_number + 1 client.update_attributes(:last_invoice_number => client.last_invoice_number + 1) end end However, attributes[:client_id] isn't set when I call @client.invoices.build. How and when is the invoice's client_id initialized, and when can I use it to initialize the invoice's number? Can I get this logic into the model, or will I have to put it in the controller?

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  • Qt QTextEdit Qt4.2 Valid HTML String

    - by Matthew Hoggan
    I am trying to generate the correct HTML to render to a QTextEdit Using Qt 4.2 on RHEL 5.3. So far my algorithm generates the following html. I am not an expert web developer, but to me this string seems valid. 319:14:27:22: <font color="rgb(255,0,0)" bgcolor="rgb(255,0,0)">Message</font><br> What needs to change to get the colours to render. Currently it just renders as black text on a white background.

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  • lexical analysis gives only one output?

    - by Caffè
    I tested this example(lexe.java), but it gave me only one output. I gave this text as a reader: public class LexeTest{ private int a = 14; } And the nextToken() function is : public Category nextToken () { if (inp.findWithinHorizon (tokenPat, 0) == null) return Category.EOF; else { lastLexeme = inp.match ().group (0); if (inp.match ().start (1) != -1) return nextToken (); else if (inp.match ().start (2) != -1) return Category.IDENT; else if (inp.match ().start (3) != -1) return Category.NUMERAL; Category result = tokenMap.get (lastLexeme); if (result == null) return Category.ERROR; else return result; } } Isdie the main method: System.out.println(lexeObject.nextToken()); output is : IDENT Why? but the textfile contains multiple keywords? Anyone know what's the problem?

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  • BULK INSERT with inconsitant number of columns

    - by aceinthehole
    I am trying to load a large amount data in SQL server from a flat file using BULK INSERT. However, my file has varying number of column, for instance the first row contains 14 and the second contains 4. That is OK, I just want to make a table with the max number of columns and load the file into it with nulls for the missing columns. I can play with it from that point. But it seems that SQL Server when reaching the end of the line and having more columns to fill for that same row in the destination table, just moves on to the next line and attempts to put the data on that line to the wrong column of the table. Is there a way to get the behavior that I am looking for? Is there a table hint that I can use the specify this? Has anyone run into this before? Here is the code BULK INSERT #t FROM '<path to file>' WITH ( DATAFILETYPE = 'char', KEEPNULLS, FIELDTERMINATOR = '#' )

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  • Problem with SQL syntax (probably simple)

    - by Bryan Folds
    I'm doing some custom database work for a module for Drupal and I get the following SQL error when trying to create my table: user warning: You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near 'DEFAULT NULL, rooms INT DEFAULT NULL, adults INT DEFAULT NULL, children' at line 14 query: CREATE TABLE dr_enquiry ( eId INT unsigned NOT NULL auto_increment, eKey VARCHAR(16) NOT NULL, dateSent INT NOT NULL DEFAULT 0, status VARCHAR(30) NOT NULL DEFAULT 'Unanswered', custName VARCHAR(50) NOT NULL, custEmail VARCHAR(200) NOT NULL, custPhone VARCHAR(25) NOT NULL, custCountry VARCHAR(40) NOT NULL, custIP VARCHAR(11) DEFAULT NULL, offerName VARCHAR(100) NOT NULL, offerURL VARCHAR(200) NOT NULL, arrival DATETIME DEFAULT NULL, departure DEFAULT NULL, rooms INT DEFAULT NULL, adults INT DEFAULT NULL, children INT DEFAULT NULL, childAges VARCHAR(32) DEFAULT NULL, toddlers INT DEFAULT NULL, toddlerAges VARCHAR(32) DEFAULT NULL, catering VARCHAR(255) DEFAULT NULL, comments VARCHAR(255) DEFAULT NULL, agent VARCHAR(100) DEFAULT NULL, voucher VARCHAR(100) DEFAULT NULL, PRIMARY KEY (eId) ) /*!40100 DEFAULT CHARACTER SET UTF8 */ in /home/travelco/public_html/includes/database.inc on line 550.

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  • wp-pagenavi keeps loading first page

    - by Adrian
    Hi I had done this correctly but unfornately its still not working, no matter what page I click in the pagination it keeps loading the first page, is it something to do with $paged? <?php $paged = (get_query_var('page')) ? get_query_var('page') : 1; ?> <?php query_posts('cat=14&posts_per_page=3'."&paged=$paged".get_query_var('page')); ?> <?php $id = get_the_ID(); $count = 0; if (have_posts()) : ?> <?php while ( have_posts() ) : the_post(); .......do stuff <?php endwhile; ?> <?php wp_pagenavi(); ?> <?php wp_reset_query();?> <?php endif; ?>

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  • How can I clip strings in Java2D and add ... in the end?

    - by Jonas
    I'm trying to print Invoices in a Java Swing applications. I do that by extending Printable and implement the method public int print(Graphics g, PageFormat pf, int page). I would like to draw strings in columns, and when the string is to long I want to clip it and let it end with "...". How can I measure the string and clip it at the right position? Some of my code: Font headline = new Font("Times New Roman", Font.BOLD, 14); g2d.setFont(headline); FontMetrics metrics = g2d.getFontMetrics(headline); g2d.drawString(myString, 0, 20); I.e How can I limit myString to be max 120px? I could use metrics.stringWidth(myString), but I don't get the position where I have to clip the string. Expected results could be: A longer string that exc... A shorter string. Another long string, but OK

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  • Invalid Memory Acess for JavaFX ScrollBar on Snow-Leopard

    - by Mike Caron
    I created the following JavaFX script, which when run, generates an Invalid memory access on Snow-Leopard. What is it about javafx.scene.control.ScrollBar that is causing a memory failure? Stage { title: "Scroll View" scene: Scene { content: [ ScrollBar { min: 0 max: 100 value: 0 blockIncrement: 10 vertical: false } ] } resizable: false } I'm using whatever JavaFX (at least 1.2) that comes with NetBeans 6.8: Product Version: NetBeans IDE 6.8 (Build 200912041610) Java: 1.6.0_17; Java HotSpot(TM) 64-Bit Server VM 14.3-b01-101 System: Mac OS X version 10.6.2 running on x86_64; MacRoman; en_US (nb)

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  • ImportError and Django driving me crazy

    - by John Peebles
    OK, I have the following directory structure (it's a django project): - project -- app and within the app folder, there is a scraper.py file which needs to reference a class defined within models.py I'm trying to do the following: import urllib2 import os import sys import time import datetime import re import BeautifulSoup sys.path.append('/home/userspace/Development/') os.environ['DJANGO_SETTINGS_MODULE'] = 'project.settings' from project.app.models import ClassName and this code just isn't working. I get an error of: Traceback (most recent call last): File "scraper.py", line 14, in from project.app.models import ClassName ImportError: No module named project.app.models This code above used to work, but broke somewhere along the line and I'm extremely confused as to why I'm having problems. On SnowLeopard using python2.5.

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  • Getting Prepared/Planning

    - by The.Anti.9
    For the first time, I am trying to create a rather large .NET project. I think the largest one I have made so far was about 6 classes, but this one is already at 14. For the section I'm starting to work on, I'm having some trouble putting everything together in my head, which is what I normally do. I think it's just a little too complex for that. I want to plan it out, and I want some way to visualize it and be able to play with it and manipulate the structure easily. Is there any sort of (free) program I can use to do this?

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  • Jquery show() not working in FF

    - by Andrea Zironda
    I have issues with FF & Jquery .show(). my website shows an embedded map from google in clicking a link.i have got a javascript function that handle this, in safari it works great.FF won't show the map. this is the js. function: function mostraPagina(nome){ if (nome='mappa'){ $('#mappa').load('contenuti/mappe/mappa_thiene.html'); $('#dark_background').show(600); $('#mappa').show(600); } } the embedded code from google maps is: <iframe width="425" height="350" frameborder="0" scrolling="no" marginheight="0" marginwidth="0" src="http://maps.google.com/maps?f=q&amp;source=s_q&amp;hl=en&amp;geocode=&amp;q=Via+Murialdo,+4,+Thiene+italy&amp;sll=45.710686,11.475665&amp;sspn=0.002439,0.005676&amp;ie=UTF8&amp;hq=&amp;hnear=Via+Murialdo,+4,+36016+Thiene+Vicenza,+Veneto,+Italy&amp;ll=45.710222,11.475618&amp;spn=0.001219,0.002838&amp;t=h&amp;z=14&amp;output=embed"></iframe> thank you very much.

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  • What does the Facebook Ads API link_click metric indicate in adcampaignstats

    - by Michael Baird
    I would love to get a definitive answer or a glossary that defines the data returned from the Facebook ads api adcampaignstats. Specifically the difference between the actions and inline_actions. Below is the result for a dark post, and I like to know what the "link_click" metric in actions and inline_actions actually counts. i.e. Does this tell me that in total the campaign had 342 links clicked, or does "link_click" in "actions" and "inline_actions" indicate something else? act_{ad_account_id}/adcampaignstats?campaign_ids=[123456] { "is_completed": false, "social_unique_clicks": 0, "topline_id": 0, "unique_impressions": 0, "start_time": null, "campaign_id": 123456, "actions": { "offsite_conversion.registration": 14, "post_like": 2, "like": 5, "photo_view": 1, "link_click": 180 }, "clicks": 301, "inline_actions": { "comment": 0, "video_play": 0, "title_clicks": 0, "like": 10, "rsvp_maybe": 0, "post_like": 13, "photo_view": 0, "rsvp_yes": 0, "link_click": 162, "question_vote": 0 }, }

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  • How can I draw a Rectangle on a PictureBox?

    - by TooFat
    I am trying to just draw a Rectangle on a PictureBox that is on a Form. Writing text like shown here works fine. private void pictureBox1_Paint(object sender, PaintEventArgs e) { using (Font myFont = new Font("Arial", 14)) { e.Graphics.DrawString("Hello .NET Guide!", myFont, Brushes.Green, new Point(2, 2)); } } but when I try to draw a rectangle like so nothing shows up. private void pictureBox1_Paint(object sender, PaintEventArgs e) { Rectangle rect = new Rectangle(); rect.Location = new Point(25, 25); rect.Width = 50; using (Pen pen = new Pen(Color.Red, 2)) { e.Graphics.DrawRectangle(pen, rect); } } What am I missing?

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  • treating json like an array

    - by tawheed
    I was doing some test with json and ran into serveral issues. hope somebody on this mailing list can help out. localStorage[LOC] = JSON.stringify(track); var boy = localStorage[LOC]; alert(boy); This is the data I get back [{"lat":42.5877511,"lng":-71.7873177,"acc":67,"date":"Sat Apr 14 2012 01:03:46 GMT-0400 (EDT)"}] I was wondering how I could access the json objects like we do in a regular array. For debugging purposes I did something like, alert(boy[0].lat); But the result I got back was undefined

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  • want to change background of table td on hover

    - by Brad
    I have a webpage that displays a calendar, and I want to change the background-color of any td that has their day number linked, so when I hover over that day, it changes the background-color. I thought this would work: .main-calendar td { width:14%; height:100px; text-align:center; border:1px solid #000; font-size:20px; vertical-align:middle; display:block; } table.main-calendar td a:hover, table.main-calendar td a:visited { display:block; text-decoration:none; background-color:red; color:#fff; } table.main-calendar td a:link { display:block; text-decoration:none; background-color:green; color:#fff; } Any help is appreciated.

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  • Can't add domain users to Reporting Services 2008

    - by Jeremy
    I have SSRS 2008 setup on the database server. The server is part of the domain. Reporting Services is running under NetworkService. When I try to add a domain user using the web interface (Site Settings -- Security -- New Role Assignment), the page posts back but the user is not in the list. The server's log file contains the following Unhandled Exception: ui!ReportManager_0-1!954!01/12/2009-10:14:52:: Unhandled exception: System.Security.Principal.IdentityNotMappedException: Some or all identity references could not be translated. at System.Security.Principal.SecurityIdentifier.Translate(IdentityReferenceCollection sourceSids, Type targetType, Boolean forceSuccess) at System.Security.Principal.SecurityIdentifier.Translate(Type targetType) at System.Security.Principal.WindowsIdentity.GetName() at System.Security.Principal.WindowsIdentity.get_Name() at ReportingServicesHttpRuntime.RsWorkerRequest.GetServerVariable(String name) at System.Web.Security.WindowsAuthenticationModule.OnEnter(Object source, EventArgs eventArgs) at System.Web.HttpApplication.SyncEventExecutionStep.System.Web.HttpApplication.IExecutionStep.Execute() at System.Web.HttpApplication.ExecuteStep(IExecutionStep step, Boolean& completedSynchronously) Any one have an idea on how to fix this?

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  • search for a winner, returning their rank

    - by incrediman
    Earlier I asked this question, which basically asked how to list 10 winners in a table with many winners, according to their points. This was answered. Now I'm looking to search for a given winner X in the table, and find out what position he is in, when the table is ordered by points. For example, if this is the table: Winners: NAME:____|__POINTS: Winner1 | 1241 Winner2 | 1199 Sally | 1000 Winner4 | 900 Winner5 | 889 Winner6 | 700 Winner7 | 667 Jacob | 623 Winner9 | 622 Winner10 | 605 Winner11 | 600 Winner12 | 586 Thomas | 455 Pamela | 434 Winner15 | 411 Winner16 | 410 These are possible inputs and outputs for what I want to do: Query: "Sally", "Winner12", "Pamela", "Jacob" Output: 3 12 14 623 How can I do this? Is it possible, using only a MySQL statement? Or do I need PHP as well? This is the kind of thing I want: WHEREIS FROM Winners WHERE Name='Sally' LIMIT 1 Ideas?

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  • How to loop over nodes with xmlfeed using scrapy python

    - by Kour ipm
    Hi i working on scrapy and trying xml feeds first time, below is my code class TestxmlItemSpider(XMLFeedSpider): name = "TestxmlItem" allowed_domains = {"http://www.nasinteractive.com"} start_urls = [ "http://www.nasinteractive.com/jobexport/advance/hcantexasexport.xml" ] iterator = 'iternodes' itertag = 'job' def parse_node(self, response, node): title = node.select('title/text()').extract() job_code = node.select('job-code/text()').extract() detail_url = node.select('detail-url/text()').extract() category = node.select('job-category/text()').extract() print title,";;;;;;;;;;;;;;;;;;;;;" print job_code,";;;;;;;;;;;;;;;;;;;;;" item = TestxmlItem() item['title'] = node.select('title/text()').extract() ....... return item result: File "/usr/lib/python2.7/site-packages/Scrapy-0.14.3-py2.7.egg/scrapy/item.py", line 56, in __setitem__ (self.__class__.__name__, key)) exceptions.KeyError: 'TestxmlItem does not support field: title' Totally there are 200+ items so i need to loop over and assign the node text to item but here all the results are displaying at once when we print, actually how can we loop over on nodes in scraping xml files with xmlfeedspider

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  • GQL: I'm storing JSON in the DataStore. All json is getting converted to html entities, how to avoid

    - by fmsf
    The tittle says most: I'm storing JSON in the DataStore. All json is getting converted to html entities, how can I avoid this? Original I had myJson = db.StringProperty() it complained the json i had was to long and StringProperty had a limit of around 500 chars. Sugesting to use TextProperty instead. It inserted without problems but now myJson looks like this when i fetch it from the database: { &quot;timeUnit&quot;: &quot;14&quot;, &quot;taskCounter&quot;: &quot;0&quot;, &quot;dependencyCounter&quot;: &quot;0&quot;, &quot;tasks&quot;: [], &quot;dependencies&quot;: []} Any sugestions?

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  • Invalid Memory Acess for JavaFX ScrollBar

    - by Mike Caron
    I created the following JavaFX script, which when run, generates an Invalid memory access. What is it about javafx.scene.control.ScrollBar that is causing a memory failure? Stage { title: "Scroll View" scene: Scene { content: [ ScrollBar { min: 0 max: 100 value: 0 blockIncrement: 10 vertical: false } ] } resizable: false } I'm using whatever JavaFX (at least 1.2) that comes with NetBeans 6.8: Product Version: NetBeans IDE 6.8 (Build 200912041610) Java: 1.6.0_17; Java HotSpot(TM) 64-Bit Server VM 14.3-b01-101 System: Mac OS X version 10.6.2 running on x86_64; MacRoman; en_US (nb)

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  • The reason for MonadState get and put?

    - by CiscoIPPhone
    I'm reading the Monads chapter in Real World Haskell (chapter 14). A function is defined as follows: type RandomState a = State StdGen a getRandom :: Random a => RandomState a getRandom = get >>= \gen -> let (val, gen')= random gen in put gen' >> return val I don't really understand the purpose of the get and put functions here. I rewrote the function as following which seems to do the same thing and is more concise: getRandom2 :: Random a => RandomState a getRandom2= State $ \ s -> random s So my question is: What is the purpose of get and put?

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