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• yum update fails

  - by user1670818

  i have RHEL 6.3 [root@RHEL6 yum.repos.d]# uname -a Linux RHEL6.3-64-BuildMac 2.6.32-279.el6.x86_64 #1 SMP Wed Jun 13 18:24:36 EDT 2012 x86_64 x86_64 x86_64 GNU/Linux My /etc/yum.conf looks like [main] cachedir=/var/cache/yum/$basearch/$releasever keepcache=0 debuglevel=2 logfile=/var/log/yum.log exactarch=1 obsoletes=1 gpgcheck=1 plugins=1 installonly_limit=3 reposdir=/etc/yum.repos.d/rhel.repo The contents of my /etc.yum.repo.d/rhel.repo looks like [rhelrepo] name=my rhel repo baseurl=http://mirror.centos.org/centos/6.3/os/x86_64/ #gpgkey=http://mirror.centos.org/centos/6.3/os/x86_64/RPM-GPG-KEY-CentOS-6 enabled=1 gpgcheck=0 But my yum update fails with the following error [root@RHEL6 yum.repos.d]# yum update Loaded plugins: product-id, security, subscription-manager Updating certificate-based repositories. Unable to read consumer identity Setting up Update Process No Packages marked for Update please could somebody help

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• What is "STRONG NAME" in .NET ?

  - by John

  Actually, yesterday I attended an intrview..in that they asked 1 question about strong name..I can't able to guess what it is?.pls explain about this..thanks.

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• Registry key editing vb6 startup

  - by Francesco D.

  Is it possible that someone here could explain how to use this code. Please keep in mind i am a complete amateur, so simplifications may be needed. Private Const cPGM = "C:\VB Forum\startup\Example.exe" Dim oShell As IWshShell_Class Set oShell = New IWshShell_Class oShell.RegWrite "HKLM\Software\Microsoft\Windows\CurrentVersion\Run\MyVBApp", _ cPGM, "REG_SZ" How exactly is this code used? Is it saved as an .exe file and ran or what? Thanks for your prompt reply and informational feedback.

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• Anyone know of a decent editable combo box plugin?

  - by DJTripleThreat

  I'm seeing a couple online but the sites that these guys have look like crap so I don't know if I want to use their plug-ins. If you USE an editable combo box in your web app and you LIKE the plugin then post it here. Please explain why you chose it over other plugins. Edit: Bonus points for anyone who is using it with Rails and can show an erb example!!

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• C++ USB Programming

  - by JB_SO

  Hi, I am new to hardware programming(especially USB) so please bear with me and my questions. I am using C++ and I need to send/receive some data (a byte array) to/from a USB port on a microprocessor board. Now, I have done some serial port programming before and I know that for a serial port you have to open a port, setup, perform i/o and finally close the port. I am guessing to use a USB port, it is not as simple as what I mentioned above. I do know that I want to use Microsoft standard drivers and implement standard Windows IO commands to accomplish this, since I believe there are no drivers for the microprocessor board for me to interact with. If somebody can point me in the right direction as to the steps needed to "talk" to a USB port (open, setup, i/o) via standard Windows IO commands, I would truly and greatly appreciate it. Thanks you so much!!

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• jQuery compression leads to errors

  - by Phil Jackson

  Hi, could someone please explain when I have a jquery script which runs fine with no errors and then compress and upload it then returns errors? Much appreciated.

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• UnicodeDecodeError when redirecting to file

  - by zedoo

  Hi, I run this snippet twice, in the ubuntu terminal, (encoding set to utf-8) once with ./test.py and then with ./test.py >out.txt: uni = u"\u001A\u0BC3\u1451\U0001D10C" print uni Without redirection it prints garbage. With redirection I get a UnicodeDecodeError. Can someone explain why I get the error only in the second case, or even better give a detailed explanation of what's going on behind the curtain in both cases?

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• Two Instances of Sql Server (2005 and 2008)

  - by Felipe

  Hi All, I installed Visual Studio 2008 Professional in my machine and It had installed SQL Server Express 2005 database in machine, and I use it very fine! I installed SQL Managment Studio and works great. So, in this week I Installed Visual Studio 2010 Pro in machine and the setup installed the SQL Server express 2008 and it overwrite the instance of my SQL Server Express 2005. All right, Now, I'd like to know how can I have two instances of the SQL Server Express in my Machine, Express 2005 and Express 2008. I can not access the 2005 , only 2008 :( and my projects uses 2005.. Somebody Help me! thanks Bye

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• Object or primitive type

  - by John

  Hi, Can someone explain to me the usage of Integer, Boolean etc in place of their primitive types in JAVA? I can't seem to grasp the advantages their are providing. They seem to create unnecessary problems of handling null values. Thanks!

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• Meaning of message "operations coalesced during safepoint"

  - by elec

  A java app runs with the following flag: -XX:+PrintSafepointStatistics, and then produces the following line on the standard output console: 2 VM operations coalesced during safepoint Anyone cares to explain what this mean ? More generally - is there a Java reference manual somewhere detailling all JVM flags, their use and, most importantly, the expected output, with relevant explanations ?

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• What are the best JavaScript implementations of a gallery?

  - by gilles27

  We need to implement a gallery feature for our client's new website. They had a similar feature on their last site, which used Smooth Gallery, which in turn was based on Moo Tools. We could go ahead and do the same however, before we do, does anyone have any suggestions for alternatives and if so, please explain why you feel your choice is better.

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• What are these values representative of in C bitwise operations?

  - by ajax81

  Hi All, I'm trying to reverse the order of bits in C (homework question, subject: bitwise operators). I found this solution, but I'm a little confused by the hex values (?) used -- 0x01 and 0x80. unsigned char reverse(unsigned char c) { int shift; unsigned char result = 0; for (shift = 0; shift < CHAR_BITS; shift++) { if (c & (0x01 << shift)) result |= (0x80 >> shift); } return result; } The book I'm working out of hasn't discussed these kinds of values, so I'm not really sure what to make of them. Can somebody shed some light on this solution? Thank you!

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• Will MySql caching cause performance problems?

  - by Camran

  I am about to upload my website onto a VPS. It is a classifieds website, where all data is stored in MySql and Solr. I wonder if when using MySql:s cache, the server will slow down? Ie, if somebody makes a search for the first time, and MySql is to cache the query, will the caching make the server slower than if it would not cache anything? After the caching is done I know things will improve in terms of performance... But I would like to know if I should even use the cache or not, what do you think? Thanks

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• Is it posibble to send websocket data over 126 chars?

  - by Udi Talias

  Its seems that everybody says that it is possible to send over 126 chars of data over websocket. I looked at many websocket server examples on the web and non of them can transfer over 126 chars from client to server and from server to client. I understand that it is something with dataframes and opcodes but i never figured it out. I'm using C#. Can somebody please put some light on this subject? any code example for receiving and sending data over 126 chars will be very very thankful

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• ASP.NET web services leak memory when (de)serializing disposable objects?

  - by Serilla

  In the following two cases, if Customer is disposable (implementing IDisposable), I believe it will not be disposed by ASP.NET, potentially being the cause of a memory leak: [WebMethod] public Customer FetchCustomer(int id) { return new Customer(id); } [WebMethod] public void SaveCustomer(Customer value) { // save it } This flaw applies to any IDisposable object. So returning a DataSet from a ASP.NET web service, for example, will also result in a memory leak - the DataSet will not be disposed. In my case, Customer opened a database connection which was cleaned up in Dispose - except Dispose was never called resulting in loads of unclosed database connections. I realise there a whole bunch of bad practices being followed here (its only an example anyway), but the point is that ASP.NET - the (de)serializer - is responsible for disposing these objects, so why doesn't it? This is an issue I was aware of for a while, but never got to the bottom of. I'm hoping somebody can confirm what I have found, and perhaps explain if there is a way of dealing with it.

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• what should be the return type of the hashCode()

  - by subhashis

  The signature of the hashCode() method is public int hashCode(){ return x; } in this case x must be an int(primitive) but plz can anyone explain it to me that the number which the hashCode() returns must be a prime number, even number...etc or there is no specification ? the reason behind i am asking this question is i have seen it in different ids the auto generated code always returns a prime number, so i need to know why? thanks in advance

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• Having trouble understanding some code (Ruby on Rails)

  - by user284194

  I posted a question awhile ago asking how I could limit the rate at which a form could be submitted from a rails application. I was helped by a very patient user and their solution works great. The code was for my comments controller, and now I find myself wanting to add this functionality to another controller, my Messages controller. I immediately tried reusing the working code from the comments controller but I couldn't get it to work. Instead of asking for the working code, could someone please help me understand my working comment controller code? class CommentsController < ApplicationController #... before_filter :post_check def record_post_time cookies[:last_post_at] = Time.now.to_i end def last_post_time Time.at((cookies[:last_post_at].to_i rescue 0)) end MIN_POST_TIME = 2.minutes def post_check return true if (Time.now - last_post_time) > MIN_POST_TIME flash[:warning] = "You are trying to reply too fast." @message = Message.find(params[:message_id]) redirect_to(@message) return false end #... def create @message = Message.find(params[:message_id]) @comment = @message.comments.build(params[:comment]) if @comment.save record_post_time flash[:notice] = "Replied to \"#{@message.title}\"" redirect_to(@message) else render :action => "new" end end def update @message = Message.find(params[:message_id]) @comment = Comment.find(params[:id]) if @comment.update_attributes(params[:comment]) record_post_time redirect_to post_comment_url(@message, @comment) else render :action => "edit" end end #... end My Messages controller is pretty much a standard rails generated controller with a few before filters and associated private methods for DRYing up the code and a redirect for non existent pages. I'll explain how much of the code I understand. When a comment is created, a cookie is created with a last_post_time value. If they try to post another comment, the cookie is checked if the last one was made in the last two minutes. If it was a flash warning is displayed and no comment is recorded. What I don't really understand is how the post_check method works and how I can adapt it for my simpler posts controller. I thought I could reuse all the code in the message controller with the exception of the line: @message = Message.find(params[:message_id]) # (don't need the redirect code) in the post_check method. But it trips up on the "record_post_time" in the create action/method. I really want to understand this. Can someone explain why this doesn't work? I greatly appreciate you reading my lengthy question.

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• sIFR seems to be loading correctly but not displaying text.

  - by CMal

  I'm Using sIFR 3r436, and although I believe everything is set up correctly, and my console shows that the .swf font file is loading correctly, the HTML type is hidden but the sIFR type is not displaying. Below is a link to the site in question: Schaffer's Website Below is a link to a test site that uses exactly the same sifr-config.js, sifr.js, css, and swf files. And it works. The main difference between the two is the server that they are running on. Schaffer's Test Site I'm hoping that maybe somebody can see a problem that I'm unable to. Appreciate the help!

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• how to use php to include an image in a word file?

  - by altvali

  Hi all! Somebody has asked me to make an app in php that will generate a .doc file with an image and a few tables in it. My first approach was: somethingsomething else cevaaltceva'); fclose($fh); ? This uses the data uri technique of embedding an image. This will generate an html file that will be rendered ok in web browsers but the image is missing in Microsoft Office Word, at least in the standard setup. Then, while editing the file with Word, i've replace the image with an image from file and Microsoft Word changed the contents of the file into Open XML and added a folder, new_files where he put the imported image (which was a .png), a .gif version of the image and a xml file: Now this isn't good enough either since i want this to be all kept in a single .doc file. Is there a way to embed an image in an OpenXML-formatted .doc file? Any help will be much appreciated.

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• Can we find out the difference between 2 RGb colors to find out a 3rd color?

  - by AK

  2 colors are mixed together. If i have the RGB for the resultant color and RGB for one of the colors mixed, then somehow i could calculate the 2nd color? I will try to explain visually what i am trying to say. Here is a flickr link http://www.flickr.com/photos/48150615@N08/4407414157 I know that the circle in the middle has an opacity of 20% Is there any way to know the color value of the circle so that i can deduct that to get the same color value as the background color.

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• post and pre increment in c

  - by jammkie same

  void main() { int a=2 , c; c=a++ + ++a + ++a + ++a; printf("%d",c); } prints 20, whereas void main() { int a=2; int c=a++ + ++a + ++a + ++a; printf("%d",c); } prints 17. Can someone explain the reason for this.

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• Javascript: How to calculate the exact position of the viewport?

  - by batmanfu

  My problem is I need to get the position of the viewport relative to the extent of the entire document. I am only concerned with Firefox. My issue is that everything I have read says that: viewport height is window.innerHeight scroll position is window.pageYOffset document total height is document.height So, I would expect that if I scrolled to the bottom of a page that window.innerHeight + window.pageYOffset = document.height But it doesn't! Can someone please explain to me why this is?

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• Why One-to-one relationship dosen't work?

  - by eugenn

  I'm trying to create a very simple relationship between two objects. Can anybody explain me why I can't find the Company object via findBy method? class Company { String name String desc City city static constraints = { city(unique: true) } } class City { String name static constraints = { } } class BootStrap { def init = { servletContext -> new City(name: 'Tokyo').save() new City(name: 'New York').save() new Company(name: 'company', city: City.findByName('New York')).save() def c = Company.findByName('company') // Why c=null????! } def destroy = { } }

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• sliver light application deploy on Linux

  - by vtejomurtula

  Hi, My requirement is host a silver light web site on Linux O/S on tomcat or web logic server. would appreciate if anyone can explain the possibility and approach for this. Regards, vidya

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• How many of you have gone from MySQL to Postgresql? Was it worth it?

  - by trustfundbaby

  I'm thinking about moving from MySQL to Postgres for Rails development and I just want to hear what other developers that made the move have to say about it. I'm looking for personal experiences, not a Mysql v Postgres shootout, just the pros and cons that you yourself have arrived at. Stuff that folks might not necessarily think. Feel free to explain why you moved in the first place as well.

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