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• Multiple port asynchronous I/O over serialport in C#

  - by firoso

  I'm trying to write a test application for serial I/O (RS-232) with multiple units in C# and I'm running into an issue with my lack of threading experience so I'm soliciting feedback for a best known method. I've got a pool of COM ports COM1-16 each of which can read/write at any time and I need to be able to manage them simultaneously. Is this a situation for a thread pool? What is some guidance on structuring this applet? Edit: Upon review I was wondering is I really even need to do asynchronous threads here, I could just maintain states for each COM-port and do flow logic (i.e., statemachine) for each COM-port individually.

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• Visual Studio ReportViewer repeating data block on every page

  - by muhan

  I am using Reportviewer to generate a sales invoice to be printed by the user. How can I get databound fields to be printed on every page of a multi page invoice? The invoice is printed on a pre-printed form. I want the printed form to look roughly like: page 1 customer john smith 123 main st. city, CA 90000 some item1 $100 some item2 $150 some item3 $150 page 2 customer john smith 123 main st. city, CA 90000 some item4 $500 some item5 $250 some item6 $950 Total $2100 Using 1 list which contains databound textbox fields for the customer info, and a table for the items. The problem is if there are many items such that the items flow over to page 2, the next page only contains items, and not the customer info which needs to be printed on second page as well. I tried using page header, but I can't use databound items in page header. Please Help!

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• Google Chrome never renders fonts properly / no smoothing etc

  - by Christian Ivicevic

  A while ago I started using Chrome and no longer Firefox, however I found out something weird which maybe force me to return to Firefox if I can not fix this. I am coding a homepage and the output was in Chrome ugly, in Firefox not. I thought "ok this is maybe due to bad code"... however I found out that the same problems occurs on different sites like Facebook too. The font is not smoothed and it is not nice to read. Here is an example, although I have censored nearly everything... Bad Chrome Rendering Good Firefox Rendering You may need to open up in a new tab to see the errors in detail. Now I want to know, whether this is just Chrome trolling me or maybe something else. EDIT I tried it out under Ubuntu on my PC and it works well... seems to be an error on Windows/Chrome on Windows.

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• Puppet, Nagios, Munin on cPanel based hosts

  - by WinkyWolly

  I've been managing 20-30~ cPanel based hosts over the past year with Puppet, Nagios and Munin for general monitoring / trending however a lot of the methods I've had to use to deploy / manage things such as configurations a pain. For those of you who aren't familiar with cPanel - it adds a few things to yum exclude such as perl*, ruby* and so forth. This causes issues with me being able to bootstrap monitoring on a new server via Puppet (well via the Package type) due to a bunch of conflicts with installing via Yum. Now I could create a custom RPM for everything and remove certain dependencies from the spec file however I would like to avoid this if possible. Does anyone have any proposed functional ways to manage this sort of environment? Currently I install Puppet, Facter and Munin via RPM's and force install using --nodeps and such (since they're installed, just no the ones Yum wants). Nagios I installed manually from source at this time (likely will create RPM's however I want to tackle this general issue first).

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• Exploratory Question for Security Admins (/etc/passwd + PHP)

  - by JPerkSter

  Hi everyone, I've been seeing a few issues lately on a few of my servers where an account gets hacked via outdated scripts, and the hacker uploads a cPanel / FTP Brute forcing PHP script inside the account. The PHP File reads /etc/passwd to get the usernames, and than uses a passwd.txt file to try and brute force it's way in to 127.0.0.1:2082. I'm trying to think of a way to block this. It doesn't POST anything except "GET /path/phpfile.php", so I can't use mod_security to block this. I've been thinking of maybe changing permissions on /etc/passwd to 600, however I'm unsure how this will result in regards to my users. I was also thinking of rate-limiting localhost connections to :2082, however I'm worried about mod_proxy being affected. Any suggestions?

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• Where are the Microsoft downloaded app compat updates stored?

  - by Ian Boyd

  Where are the Microsoft application compatibility update settings stored on a Windows XP, Windows Vista, and Windows 7 computer? Microsoft periodically release application compatibility updates (e.g. KB929427), where they list the shims that should be applied to a program in order to workaround known bugs in the software. Where are these app compat flags stored, and how can i see what shims are being applied? i have a feeling that a recent app compat update included a flag to force a particular piece of software, that we use, to require administrator. Because the task is scheduled to run nightly, and the running user does not have administrative privelages, the task is failing to start. The application is requiring to be elevated. It has the UAC shield overlay. The application has no RT_MANIFEST resource, and the compatibility option Run this program as administrator is disabled (per-user and all users). So all that's left is some secret global setting. i know user-specified compat flags are stored in: HKEY_LOCAL_MACHINE \SOFTWARE \Microsoft \Windows NT \CurrentVersion \AppCompatFlags \Layers

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• Where to start when programming process synchronization algorithms like clone/fork, semaphores

  - by David

  I am writing a program that simulates process synchronization. I am trying to implement the fork and semaphore techniques in C++, but am having trouble starting off. Do I just create a process and send it to fork from the very beginning? Is the program just going to be one infinite loop that goes back and forth between parent/child processes? And how do you create the idea of 'shared memory' in C++, explicit memory address or just some global variable? I just need to get the overall structure/idea of the flow of the program. Any references would be appreciated.

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• Tomcat memory usage grows until crash with no GC run

  - by Phil

  I'm administrating a server running Tomcat that is getting a lot of traffic lately. If I monitor memory usage in Task Manager I can see the memory usage growing and eventually tomcat crashes around the 1GB mark. Here's the memory relevent bits I've set in Tomcat Properties (this is a Windows Server): Intial memory pool: 1024 MB Maximum memory pool: 1024 MB -XX:MaxPermSize=256M The weird thing is since these problems arose I've deployed Lambda Probe to the Tomcat instance and the memory usage values I see there are much lower, for example Task Manager might show 467MB used while the "Total" used in Probe is 212 MB. Also, the Maximum Total listed in Probe is 1.29GB, when I would have expected 1GB, the maximum memory set above. If I force the garbage collector to run using Probe, I can keep Tomcat from crashing for a while (indefinitely, AFAIK). So why doesn't the GC run automatically and stop Tomcat from crashing? Thanks.

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• Dynamically loading hi-res images into UIScrollView

  - by Jeff

  I've been looking into creating a gallery mode in my application. The functionality will be identical to the built in Photos App. Here's the flow: 1. You touch on a thumbnail and ... 2. a modal view displays a large detail version of the image 3. You have the ability to scroll horizontally through all the images in the gallery while in this modal view I'm stuck on step 3. How do I dynamically load hi res images into a scroll view? I understand I need to set the contentSize for the the scrollView but how do I do that when I've only selected and loaded one image? What delegate methods do I need to implement and what does the heavy lifting look like? Thanks in advance!

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• Does kern.hz still have any relevance in FreeBSD if "dynamic tick mode" is enabled?

  - by Frerich Raabe

  I'm running a FreeBSD 9.0 setup as a virtual machine in a KVM setup. In previous versions of FreeBSD it was common to force the kern.hz setting to a lower value so that the virtual machine does not keep the host busy because it's handling timer interrupts without having any work to do - the FreeBSD Handbook explains: The most important step is to reduce the kern.hz tunable to reduce the CPU utilization of FreeBSD under the Parallels environment. This is accomplished by adding the following line to /boot/loader.conf: kern.hz=100 Without this setting, an idle FreeBSD Parallels guest OS will use roughly 15% of the CPU of a single processor iMac®. After this change the usage will be closer to a mere 5%. However, in FreeBSD 9, the "dynamic tick mode" (aka "tickless mode") is the default, controlled by the kern.eventtimer.periodic setting which defaults to 0 (read: tickless mode). This makes me wonder - does the tip of lowering kern.hz still have any relevance for making FreeBSD 9 play nicely in a virtual machine setup?

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• MS SQL 2000 and SSL Certificate

  - by smoak

  I'm trying to set up a MS SQL 2000 server to use an already existing SSL certificate installed on the server. I verified that the certificate shows up in the Personal/Certificate folder of the account that is running the MSSQLSERVER service using the Certificate MMC snap-in. I also verified that the certificate for the CA is installed under the Trusted Root Certificate Authorities. Additionally, to make sure that it is using this specific certificate I created a Certificate registry value of type REG_BINARY in: HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\MSSQLServer\MSSQLServer\SuperSocketNetLib and I set it to the certificates thumbprint like it mentions in: http://support.microsoft.com/kb/276553 Finally, I opened up the Server Network Utility, checked Force protocol encryption, clicked OK, and restarted the MSSQLSERVER service. Unfortunately, it fails to start and looking at the event log it's failing with: 19015: Encryption requested but no valid certificate was found. SQL Server terminating. I'm at a loss. Any ideas? Where did I go wrong?

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• Twitter like status message using jquery...

  - by Pandiya Chendur

  I am using this jquery javascript function to show status message, function topBar(message) { $("<div />", { 'class': 'topbar', text: message }).hide().prependTo("body") .slideDown('fast').delay(4000).slideUp(function() { $(this).remove(); }); } and my css: .topbar { background: #476275; border-bottom: solid 2px #EEE; padding: 3px 0; text-align: center; color: white; font-family:Arial,Helvetica,sans-serif; font-size:135%; font-weight:bold; }? I am getting my status message but what it does it inserts a div within the body tag instead i want the message to display out of the body(z index) exactly like twitter (ie) just flow my message from top and hide it... Any suggestion.... Hope you got my question..

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• Including sender email address when forwarding emails with Outlook 2007

  - by Roee Adler

  When forwarding an email in Outlook (I have 2007), the header of the previous email shows. Sometimes it may show as follows: From: Joe Shmoe Sent: Saturday, June 12, 2010 10:01 PM To: Roee Adler Subject: Following our previous conversation Other times it will include the actual email address of the sender of the previous mail: From: Sponge Bob [mailto:[email protected]] Sent: Saturday, June 12, 2010 2:26 PM To: Roee Adler Subject: Sponges and other stuff How do I force every forwarded email to include the mail address? When forwarding from my iPhone it constantly keeps the address just the way I want it, but from Outlook it seems to depend on whether the sender is a contact of mine or not. The reason I need this is for 37signals' Highrise CRM system.

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• Why uses git fast-forward merging per default?

  - by Florian Pilz

  Coming from mercurial, I'm using branches to organize features. Naturally I want to see this work-flow in my history as well. But I started my new project with git and finished a feature. After merging I realized that git used fast-forward and forgot about my branch. So to think into the future: I'm the only one working on this project. If I use the default approach of git (fast-forward merging) my history would result in one giant master branch. I don't want this and can't see any good reason making this default. Maybe there are reasons, but what's so striking about it, that it has to be the default action?

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• Using mod_wsgi with mpm_itk: socket permission issue

  - by djechelon

  I'm using mod_itk as MPM for increased security in shared environment. I also have a Firefox Sync Server within one of the VHosts I host. That vhost is restricted to a certain user via AssignUserId user group. The problem is that the socket /var/run/wsgi...whatever.sock is chmodded srwx------ and owned by Apache's wwwrun. While I configured the vhost with WSGIProcessGroup sync WSGIDaemonProcess sync user=djechelon group=djechelon processes=1 threads=5 I still get the error that Apache wants to access a socket that is not accessible and because of this gets an error. Is it possible to configure mod_wsgi in order to create different sockets with different owners for different applications or to chmod its socket in a different way (less secure)? Currently, I'm running Firefox Sync as the only WSGI application. Moving it to a vhost that doesn't AssignUserId could solve this problem but will force me to change URL (and buy an additional SSL certificate), so I wouldn't consider this

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• Can't see images used in slideshow or other jQuery plug-ins in Internet Explorer 8

  - by Kais

  I am getting a weird error. I can see images in slideshow, lightbox, etc. in Firefox and Chrome but in Internet Explorer 8 there are no images. Something is wrong with JavaScript/jQuery I think. I am using jQuery 1.4.2, jquery.flow.1.2.min.js jquery.bgpos.js jquery.easing.1.3.js jquery.lightbox-0.5.min.js jquery.validate.js cufon-yui.js jquery.galleriffic.js DD_belatedPNG.js clearbox.js Please check this. I have pasted images under slideshow, you can see those at http://kaisweb.com/projects/resume/ and http://kaisweb.com/projects/resume/index.php?p=templates. I tried to search but couldn't find anything. Even if I remove jQuery, still there are no images in Internet Explorer 8.

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• How can I set an account lockout policy for the administrator account on rdp?

  - by reinier

  I'm following this page on security tips for RDP (for my online server): http://www.mobydisk.com/techres/securing_remote_desktop.html Now I don't have a special user account for RDP access. Just the administrator can log on. However, I want to make sure that someone can't brute force the password. I've set the 'account lockout policy' to 3 attempts and a retry after 3 minutes. However, when I connect back with RDP I can still try 5 times before RDP breaks the connection. I can then immediately reconnect and try 5 more times. Any ideas if there is a lockout policy which also holds true fro the admin?

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• jgraph like component on vaadin framework

  - by vsp

  Hi, Currently I am working on a process manager kind application, which needs jgraph( http://www.jgraph.com ) kind of component. The process manager is a kind of process flow chart. I am currently using vaadin framework. Is there any such built in components available in vaadin or can i have any plugin to create a drag & drop graph for my app. Please let me know if any one has already done this. Thanks.

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• How to make iTunes download all podcast episodes irrespective of listened/not

  - by user15660

  I am a big iPod user (especially podcasts). I have used iPod touch, iPod classic and iPod nano. I noticed that iTunes stops downloading podcasts that you no longer listen to and stops downloading them. Is there a way to force iTunes to download all episodes of podcasts irrespective of whether you listen to them or not? I am not interested in just clicking a episode to make iTunes think that I'm listening. I need some kind of programmatic work around or batch script that runs and updates all podcasts/episodes automatically.

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• User Interface functionality modelling languages?

  - by naugtur

  I am looking for a UI functionality modelling language (UML-alike "thing", but for user interfaces) that is already accepted and maybe has its design patterns and handles the problem better than state or activity diagram. (If there is no such thing I'm planning to develop that BTW :)) This question came to mind as a result of a discovery that UML and its diagrams fails at describing complicated UI functionality with event-driven flow of execution (ie. javascript/jQuery big projects) EDIT: I've been thinking of using BPMN but It was not created for this purpose. EDIT2: See this community topic of mine - I decided to start developing said language.

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• How do i deploy UAT and Development SharePoint solution on the same server ?

  - by Nikhil Vaghela

  I am working on a SharePoint 2010 Server and i have following items in my SharePoint solution Couple of web parts State Machine Work flow (which will be integrated to an Infopath form library) Infopath task edit forms Lets say this solutions is deployed to http://[SharePoint201Server]:[PortNumber-x]/ This is the only server i have (No extra server for UAT), and what ever has been done so far needs to be given for user acceptance testing (UAT). I may create one more site at http://[SharePoint201Server]:[PortNumber-y]/ for it. My problme is that how do i maintain two copies of my source code ? I will have to continue development on the same set of source code for next UAT release. I simply can not create simple copies of the source code as it will have same Assembly name and feature id, etc..As if i do so, any changes on under Development source code would affect UAT assemblies. One thing i can do is to create seperate projects for UAT and Development with different Features and Assembly names, but is not that too much of an unneccesory work ? What can be the best approach in such situation ?

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• Is there an ftp plugin for gedit that will let me work locally?

  - by RobertWHurst

  I'm trying to switch from a windows environment to Linux. I'm primarily PHP developer, but I do know quite a bit about other languages such as CSS, XHTML and Javascript. I need a way of editing my files locally because I work in a git repository and need to commit my saves. On windows I used Aptana and PDT. I'd save my files, upload via Aptana, then commit my work with git. I need to get a work flow going on my Linux machine now. If you know a better way to do this let me know, however my real question is, is there a plugin that allows gedit to upload files instead of working remotely?

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• LCD monitor reports incorrect maximum resolution

  - by SLaks

  I have four 20" Planar 2010M LCD monitors with a maximum resolution of 1600 x 1200 connected to two nVidia video cards (8600 GT and 7600 GS). I'm running Windows Server 2003 x86. Recently, two of the monitors have started mis-reporting their maximum resolution as 1280 x 1024. When this first happened, I used nVidia's Custom Resolutions feature to force the monitors back to 1600 x 1200. Yesterday, however, I upgraded nVidia's video card driver, and ever since, I cannot get the DVI one back to 1600 x 1200. When I add the custom resolution in nVidia's control panel, if I set either the width or the height to even a single pixel more than 1280 x 1024, nothing changes when I click Test (the monitor doesn't even flash black, although after 15 seconds, it flashes black and doesn't change). After adding Does anyone know what the problem is? Is there anything I can do about it?

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• Automatically encrypting incoming email

  - by user16067

  I have a small website and would like to encrypt incoming email using gpg. Is there a way to force sendmail to check email and encrypt it if its not already encrypted? I'm using GPG on a linux server. Thanks [added]Someone asked what I hope to accomplish. My intent is for the users of the email to become more familiar with seeing thier own email encrypted and losing that fear of the unknown. The side benefit is that the email can't be looked at later down the road. If the email isn't encrypted on its way in, I'm unable to do anything about it. I'm assuming most email would be nosed around with once its already on my hard drive, so GPG would protect against those issues.

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• Question about ubuntu untrusted source, gpg, keyserver

  - by ???

  I have mirrored the ubuntu archive repository (I must say it's rather huge). Then, I can apt-get install with no problem, but it prompts with following warning: WARNING: The following packages cannot be authenticated! xxxx, xxxx, ... Install these packages without verification [y/N]? Well, you can always install it. But, I can't install from the ubuntu software GUI. Which require trusted source. So, 1. How to force the GUI to install untrusted package? 2. Should I configure GPG to receive some public keys? (I've already installed ubuntu-keyring, debian-keyring, but it still untrusted) 3. Should I configure GPG to receive unknown keys from some specific keyservers, automatically?

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