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• How to find out who's causing an access violation error?

  - by Fernando

  I'm getting reports that my app is causing a GPF on some Vista machines. The error message is something like this: access violation at 0x75784062 ( tried to write to 0x00000006) In order to fix this, I first need to know exactly who is causing this GPF: my main exe, some third party component, one of my own activex components, a dll, etc... How can I find this out? What tools can pinpoint the exact module that caused this mess? Any help would be greatly appreciated. PS My app is coded in VB6 and my activex controls are written in Delphi 2007.

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• How to prevent direct access to my JSON service?

  - by FrankLy

  I have a JSON web service to return home markers to be displayed on my Google Map. Essentially, http://example.com calls the web service to find out the location of all map markers to display like so: http://example.com/json/?zipcode=12345 And it returns a JSON string such as: {"address": "321 Main St, Mountain View, CA, USA", ...} So on my index.html page, I take that JSON string and place the map markers. However, what I don't want to have happen is people calling out to my JSON web service directly. I only want http://example.com/index.html to be able to call my http://example.com/json/ web service ... and not some random dude calling the /json/ directly. Quesiton: how do I prevent direct calling/access to my http://example.com/json/ web service?

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• How do I improve the efficiency of the queries executed by this generic Linq-to-SQL data access clas

  - by Lee D

  Hi all, I have a class which provides generic access to LINQ to SQL entities, for example: class LinqProvider<T> //where T is a L2S entity class { DataContext context; public virtual IEnumerable<T> GetAll() { return context.GetTable<T>(); } public virtual T Single(Func<T, bool> condition) { return context.GetTable<T>().SingleOrDefault(condition); } } From the front end, both of these methods appear to work as you would expect. However, when I run a trace in SQL profiler, the Single method is executing what amounts to a SELECT * FROM [Table], and then returning the single entity that meets the given condition. Obviously this is inefficient, and is being caused by GetTable() returning all rows. My question is, how do I get the query executed by the Single() method to take the form SELECT * FROM [Table] WHERE [condition], rather than selecting all rows then filtering out all but one? Is it possible in this context? Any help appreciated, Lee

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• How do I integrate ActiveMQ with a HornetQ ESB (or access the HornetQ directly from C#)?

  - by natonic

  I've got an ActiveMQ ESB that I am using between several C# assemblies across a couple different systems. I need to start receiving notifications being sent out by a new system from it's HornetQ ESB. As far as I can tell the HornetQ is pre-2.0.0GA. I'd like to just use Camel to set up routing between the HornetQ ESB and my ActiveMQ ESB, but so far we haven't been able to get even that far. I'm not sure how much flexibility I've got to change the HornetQ configuration (say to add support for StompConnect or something like that). Does anyone of a viable option for getting access to the HornetQ ESB through ActiveMQ (or directly from C# if necessary)?

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• How to access a control placed inside data template of listbox?

  - by Subhen

  Hi I have the following code: <ListBox x:Name="foldersListBox" Grid.Column="0" MouseLeftButtonUp="foldersListBox_MouseLeftButtonUp" BorderThickness="0" Height="AUTO" ScrollViewer.HorizontalScrollBarVisibility="Disabled" ScrollViewer.VerticalScrollBarVisibility="Disabled"> <DataTemplate> <Border BorderBrush="LightGray" BorderThickness="2" CornerRadius="4"> <Image x:Name="folderImage" Width="70" Height="70" Margin="3" /> </Border> </DataTemplate> </ListBox> Now when I am trying to access folderImage from code behind. I can use the loaded event and typecast the sender as Image type , but I dont want that way. Help plz. Thanks, Subhen

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• Is it safe to catch an access violation in this scenario?

  - by Eloff

  I've read a lot, including here on SO that suggests this is a very bad idea in general and that the only thing you can do safely is exit the program. I'm not sure that this is true. This is for a pooling memory allocator that hands off large allocations to malloc. During pool_free() a pointer needs to be checked it it belongs to a pool or was allocated with malloc. By rounding the address down to the nearest 1MB boundary, I get a pointer to the beginning of a block of memory in the pool, or undefined if malloc was used. In the first case I can easily verify that the block of memory belongs to the pool, but, if it does not I will either fail this verification, or I will get an access violation (note that this is a read-only process). Could I not catch this with SEH (Windows) or handle the signal (POSIX) and simply treat it as a failed verification? (i.e. this is only possible if malloc was used, so pass the ptr to free())

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• Tunneling HTTP traffic from a particular host/port

  - by knoopx

  Hello, I'm trying to figure out how to access from my development machine (Devel) to a third party web service (www.domain.com) which I am not allowed to directly contact using my office IP address. Here's a basic diagram (i'm not allowed to post images...): http://yuml.me/diagram/scruffy/class/%5BDevel%5D-%5BA%5D,%20%5BA%5D-%5BB%5D,%20%5BB%5D-%5Bwww.domain.com%5D The only machine allowed to access that service is B (production server) but I do neither can directly access it from my development machine (Devel). So in order to access the web service I have to ssh into A, and then from A to B to access www.domain.com Is there any way of tunneling traffic from B to A and then back to my development machine so I can directly access www.domain.com without having to ssh into every box? Devel: My development machine. A, B: Linux servers. I own root access on both. B: Production server www.domain.com: Third party HTTP API production server uses.

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• How can I get a data usage/access log for an external hard-drive?

  - by Vittorio Vittori

  Hello, I'm working in an office with many people and sometimes I leave my external hard drive with my personal data inside. I would to know if there is some way to see if my hard disk was used during my absence. I'm not the computer administrator, so I can't use exclusive file permissions and I would really like to know hard disk is opened from another computer. I am using a Mac. Does exist some other way to protect personal data on usb device like an hard-drive? If yes can you write some link to possible guides? I hope there is some ploy!!

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• flash player embedded in asp page which is opened in webbrowser control in .NET access through windo

  - by Prit

  I am develoing a windows application in C#.NET. In one of my winform I have added a WebBrowser control. In this webbrowser control I have opened an asp page from my local website. Now in this webpage there is one flash object which is used to play swf files. Now my question is can I access this control from my winform? If so then how? can u create a handler for that flash object?

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• Windows Photo Viewer can't open this picture because you don't have the correct permissions to access the file location

  - by Software Monkey

  My system in Windows 7 and fully up to date with all patches and options (except for Microsoft Silverlight, which I refuse to install). I get this error whenever I try to open an image using Windows Photo Viewer, such as when previewing from Explorer or when opening an image attachment to an email. I have already verified correct permissions to the file and all folders in the path. The strange thing is that every other program I have seems to open the images fine, including "Slideshow" from Windows Explorer. Even more strange, in WPV there is an "Open" menu that lists the other programs for images including GIMP and MS Paint and they open the very file that WPV is complaining about just fine. That should eliminate permissions as being the problem, especially since (logically at least) they are read/write while WPV is read-only. I have even edited and saved the images that WPV does not open. I am out of ideas, and searching for answer on the Web has resulted only in the same tired repitition of some flavor of "take ownership and reset permissions for the entire drive", which I have already done. And which is counter-indicated by the fact that only Windows Photo Viewer seems to have a problem. The one thing which is slightly unusual is that for normal files they are all on a second HDD mounted into C:, however for email attachments the temporary folder is C:\Temp\, which is directly on that drive.

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• ruby on rails: How do I access variable data in a url parameter passed to a model?

  - by bandhunt

  I have a variable called "account_type" passed from a rails form and need to access the value in the corresponding model. I can check if :account_type exists as a symbol, but where does the stored data come into play? Is there something I need to do in the controller? This code gives an undefined method 'account_type' error. validates_format_of :name, :with => /^[a-z0-9_]+$/i, :on => :create if account_type == 2 If I use a symbol then it doesn't give an error, but a symbol will never equal 2 validates_format_of :name, :with => /^[a-z0-9_]+$/i, :on => :create if :account_type == 2 It's confusing that you can validate the format of a symbol (like :name above) when :name only seems to be a reference with nothing stored in it. Thanks!

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• Basic networking: Centos Server Router + Ubuntu Client setup.. unable to access outside world from client

  - by ale

  I am trying to set up my Centos Server with two NICs as a router. eth0 is connected to the outside world and eth1 is connected to an Ubuntu client. Here's eth0 on the server: DEVICE=eth0 BOOTPROTO=dhcp ONBOOT=yes TYPE=Ethernet eth1 on the server: DEVICE=eth1 BOOTPROTO=static IPADDR=192.168.0.10 # a free address on my network ONBOOT=yes TYPE=Ethernet My server has IPv4 packet forwarding turned on and my iptables only contains: # iptables --table nat --append POSTROUTING --out-interface eth0 -j MASQUERADE # iptables --append FORWARD --in-interface eth1 -j ACCEPT My Ubuntu client has this in its /etc/network/interfaces auto lo iface lo inet loopback iface eth0 inet dhcp gateway 192.168.0.10 but I can't get an Internet connection from the server for my client. I can't even ping my server from the client: $ ping 192.168.0.10 Destination Host Unreachable

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• How to access private static target field in aspect in AspectJ?

  - by LihO

  I have a simple class Main with private static int x and an aspect that should output the old value of x before it is reassigned: public class Main { private static int x; public static void main(String[] args) { foo(7); } public static void foo(int y) { x = y; } } and MonitorX.aj: public aspect MonitorX { before() : set(static int Main.x){ System.out.println(Main.x); } } which doesn't work since I can't access private x using Main.x. I've also tried: before(int t) : set(static int Main.x) && target(t){ System.out.println(t); } which doesn't work either (nothing is outputted, if I try to output string, it seems that the aspect isn't invoked at all). However printing out the new value that is being assigned works: before(int newVal) : set(static int Main.x) && args(newVal){ System.out.println(newVal); } What am I missing?

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• Javascript + Firebug : "cannot access optimized closure" What does it mean?

  - by interstar

  I just got the following error in a piece of javascript (in Firefox 3.5, with Firebug running) cannot access optimized closure I know, superficially, what caused the error. I had a line options.length() instead of options.length Fixing this bug, made the message go away. But I'm curious. What does this mean? What is an optimized closure? Is optimizing an enclosure something that the javascript interpretter does automatically? What does it do?

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• How can I get PHP to compile a LaTeX document if it (www-data) can't get access to the required packages?

  - by Mark Jones

  I have a PHP script that compiles LaTeX documents with the use of: exec('cd /path/to/doc && /usr/bin/latexmk -pdf filename.tex'); This is working for some of my LaTeX documents but my latest document doesn't compile and a look at the log reveals: !pdfTeX error: pdflatex (file ecrm1000): Font ecrm1000 at 600 not found ==> Fatal error occurred, no output PDF file produced! Which I have found is the result of LaTeX not being able to see the required font packages. When I run the same compile command under my username the document compiles as it should. So my question is, how can I get PHP (executing as www-data) to get access to the necessary LaTeX packages? I have tried installing the required package under the www-data account using: sudo -u www-data sudo apt-get install texlive-fonts-recommended but it askes for www-data's password, which I don't believe was set by me and isn't anything I've thrown at it. I'm running Ubuntu 12.04 if it's any help.

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• HA Proxy and Disaster Recovery - Only access server if others are down?

  - by ben2004uk

  Why I expect this is not the best way to solve the problem, I got thinking tonight. I'm thinking about geo-locating servers. Given we have a load balancer + two servers to handle traffic in NA (North America) and one server in the EU. If the two US servers die, is it possible to get HAProxy to direct traffic automatically to the EU one. However, I don't want to use a roundrobin approach for the EU - just the two US ones. The EU should only be hit when the other two are down. Does anyone know how to configure HAProxy to do this? Thanks Ben

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• Is there any way to access the mp3 or other file type tags from within an ipod touch/iphone?

  - by quixotic1

  I am just looking for an existing app that will let me read all the tags that are stored in a particular song on my ipod touch/iphone. I'm not much of a programmer, but would be willing to learn the iphone sdk (on windows) if I could build a program that would do this for me. I would love to be able to modify the tag while on the iphone, but just viewing them would be a great use to me. I'd like to read the Year tag, the comments tag, composer, etc. It's so annoying that I can't do this. Or can I already and I just don't know how. Yes, I know how to view the lyrics tag. Seems they could have included the other tags. Help please? Thanks, Dave

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• Can you specify git-shell in .ssh/authorized_keys to restrict access to only git commands via ssh?

  - by Matt Connolly

  I'd like to be able to use a ssh key for authentication, but still restrict the commands that can be executed over the ssh tunnel. With Subversion, I've achieved this by using a .ssh/authorized_keys file like: command="/usr/local/bin/svnserve -t --tunnel-user matt -r /path/to/repository",no-port-forwarding,no-agent-forwarding,no-X11-forwarding,no-pty ssh-rsa AAAAB3NzaC1yc2EAAAABIetc... I've tried this with "/usr/bin/git-shell" in the command, but I just get the funky old fatal: What do you think I am? A shell? error message.

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• Java: How do you access a sub-object of an object with no "getXXX" method to that sub-object

  - by Daxon

  I'll explain with pictures from Eclipse Debugger I have an Class called "FieldContext", (I can't edit it, it's compiled in the Java OVal API) Within "FieldContext" on the eclipse variable tab are "CompileTimeType" and "field" Q1 Is there a legend for the icons in the variables tab? like what the red box with the "F" means + yellow diamond boxes? Now I want to access the fields inside the "field" object (RedBox) .. preferably "name" But the "FieldContext" does not have a "getField()" method, yet it has a "getCompileTimeType()" method. Q2 So is there anyway to get that field object being a "SerializableField" Class from the "FieldContext"? If eclipse debugger can see/get/edit them then I hope I can do the same in Java.

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• Remote Desktop Services create LAN and WAN user groups

  - by PHLiGHT

  I'm setting up one server with the gateway, server host and web access roles on it. I know that isn't ideal but I don't expect to have many simulatenous users. I want users to access remote desktop web access and connect to the server host via the gateway as outlined here which avoids opening 3389 to the internet. Users will be connecting from the LAN and the WAN. What I'm looking to do is to allow some users LAN access but not WAN access and added plus would be if security settings (such as no clipboard) would be different when accessing via the WAN. Is this possible? It seems all users can logon to remote desktop web access by default. They can't run the remoteapps once logged in though without the proper permissions. Can I prevent them from even logging into remote web access? Since they renamed it from terminal services to remote desktop services it has made my Googling a bit harder. Thanks!

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• What is the best way to access Google Calendar from ruby?

  - by Jakub Hampl

  I'm writing an app for a company that uses Google Calendar internally and would need to use events they already have in their calendar in the app. So I need to get read only access to their calendars from the app (namely I need the events title, start and end dates and attendee emails for all future events). What is the simplest way to do this in ruby (I would need it to work relatively seamlessly on Heroku)? I tried using the GCal4Ruby gem which seemed the least outdated of the ones I found but I'm unable to even authenticate through the library (HTTPRequestFailed - Captcha required error) let alone get the info I need.

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• What's the fastest way to store/access large files?

  - by philfreo

  I do a lot of video editing on my Mac and need a way to store very large (30 GB) files, and don't have room on my HD. A USB/Firewire external hard drive would work, but it seems way too slow for consistently working with such large files. I've also considered buying another computer, with a large hard drive, and putting it on the same network with a shared folder. What's the fastest / most efficient way to do this? Please consider USB 2.0 speeds, hard drive read times, ethernet speeds, etc. Are there other options I should consider?

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• How to give everyone access to a office@companyname address and let everyone see what messages were

  - by Cosmin Prund

  This should be simple (because I assume everyone has this problem) but googling and searching of serverfault didn't help much. I'd like all messages sent to our "office@companyname" to be visible by everyone and I'd like anyone to be able to respond. I also need everyone to at least SEE that a given message has already been answered (the ability to see the actual response would be nice). I tried using an shared folder for this but it fails miserably because replying to emails leaves no trace, not even for the user that actually sent the message. I'm open to any kind of solution, even commercial add-on solutions.

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• OWA (Outlook Web Access) won't give user a link to attached document. Gives "Open as Web Page"

  - by Jerry Mayers

  I have been testing OWA and have found that when there is an attached file on a message it shows the "Attachments:" then the file name (but no link) and then [Open as Web Page] link. The user has to click on that which opens a new window and previews the document, then the user gets "You are currently viewing:" followed by the file name. This time the file name is a link that they can open/download. This happens for Office documents and PDF file at least. How do I make it so users can get a direct link to the file on the original message window?

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• How to deny access to disabled AD accounts via kerberos in pam_krb5?

  - by Phil

  I have a working AD/Linux/LDAP/KRB5 directory and authentication setup, with one small problem. When an account is disabled, SSH publickey authentication still allows user login. It's clear that kerberos clients can identify a disabled account, as kinit and kpasswd return "Clients credentials have been revoked" with no further password / interaction. Can PAM be configured (with "UsePAM yes" in sshd_config) to disallow logins for disabled accounts, where authentication is done by publickey? This doesn't seem to work: account [default=bad success=ok user_unknown=ignore] pam_krb5.so Please don't introduce winbind in your answer - we don't use it.

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