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  • Writing cross-platforms Types, Interfaces and Classes/Methods in C++

    - by user827992
    I'm looking for the best solution to write cross-platform software, aka code that I write and that I have to interface with different libraries and platforms each time. What I consider the easiest part, correct me if I'm wrong, is the definition of new types, all I have to do is to write an hpp file with a list of typedefs, I can keep the same names for each new type across the different platforms so my codebase can be shared without any problem. typedefs also helps me to redefine a better scope for my types in my code. I will probably end up having something like this: include |-windows | |-types.hpp |-linux | |-types.hpp |-mac |-types.hpp For the interfaces I'm thinking about the same solution used for the types, a series of hpp files, probably I will write all the interfaces only once since they rely on the types and all "cross-platform portability" is ensured by the work done on the types. include | |-interfaces.hpp | |-windows | |-types.hpp |-linux | |-types.hpp |-mac | |-types.hpp For classes and methods I do not have a real answer, I would like to avoid 2 things: the explicit use of pointers the use of templates I want to avoid the use of the pointers because they can make the code less readable for someone and I want to avoid templates just because if I write them, I can't separate the interface from the definition. What is the best option to hide the use of the pointers? I would also like some words about macros and how to implement some OS-specifics calls and definitions.

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  • Policy Routing with Openvpn?

    - by sadawd
    Dear Everyone I am currently using openvpn for normal browsing. However, I have the following services running: a bit torrent client, a web server, IRC and a git server which I would really want it to not be using my vpn connection (and use my original connection instead). Is there a way to do this? I looked up policy routing and I can't really find any tutorial on how to do this on linux (I am on ubuntu). I don't want the solution to be incredibly complicated - I am pretty new to networking in ubuntu and I only want a very simple solution to this problem. Can someone help me out?

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  • Why I love NUnit, NCover, CC Nant and friends

    - by gregarobinson
    I have used these opensource tools on past projects in different stages, but never all of them at once. I am on a project now where there is a build server, Subversion, Nant, NUnit with 100% NCover required coverage, CrusieControl, CCTray and Rhino Mockc.I was extending an Interface and concrete class in a solution I had never worked on before today. Automatic builds were turned off for the day for a special case QA test. I added my new members to the Interface, implemented them in the concrete class, did a local build, tested, all looked good, so I did a Subversion Update then Commit.  Around 4:30PM the automatic builds were turned back on. Right away the build failed for less than 100% code coverage on my last Commit. Turns out there was a project in the solution I modified that had numerous NUnit tests on the Interface/Concrete class I modified, 3 of which now failed. Now that is cool..of course i was frustrated as i wanted to go home..but..I did a bad thing..I did not run nant on the source prior to my Commit. Lesson learned, and a great lesson at that!   

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  • Tip on Reusing Classes in Different .NET Project Types

    - by psheriff
    All of us have class libraries that we developed for use in our projects. When you create a .NET Class Library project with many classes, you can use that DLL in ASP.NET, Windows Forms and WPF applications. However, for Silverlight and Windows Phone, these .NET Class Libraries cannot be used. The reason is Silverlight and Windows Phone both use a scaled down version of .NET and thus do not have access to the full .NET framework class library. However, there are many classes and functionality that will work in the full .NET and in the scaled down versions that Silverlight and Windows Phone use.Let’s take an example of a class that you might want to use in all of the above mentioned projects. The code listing shown below might be something that you have in a Windows Form or an ASP.NET application. public class StringCommon{  public static bool IsAllLowerCase(string value)  {    return new Regex(@"^([^A-Z])+$").IsMatch(value);  }   public static bool IsAllUpperCase(string value)  {    return new Regex(@"^([^a-z])+$").IsMatch(value);  }} The StringCommon class is very simple with just two methods, but you know that the System.Text.RegularExpressions namespace is available in Silverlight and Windows Phone. Thus, you know that you may reuse this class in your Silverlight and Windows Phone projects. Here is the problem: if you create a Silverlight Class Library project and you right-click on that project in Solution Explorer and choose Add | Add Existing Item… from the menu, the class file StringCommon.cs will be copied from the original location and placed into the Silverlight Class Library project. You now have two files with the same code. If you want to change the code you will now need to change it in two places! This is a maintenance nightmare that you have just created. If you then add this to a Windows Phone Class Library project, you now have three places you need to modify the code! Add As LinkInstead of creating three separate copies of the same class file, you want to leave the original class file in its original location and just create a link to that file from the Silverlight and Windows Phone class libraries. Visual Studio will allow you to do this, but you need to do one additional step in the Add Existing Item dialog (see Figure 1). You will still right mouse click on the project and choose Add | Add Existing Item… from the menu. You will still highlight the file you want to add to your project, but DO NOT click on the Add button. Instead click on the drop down portion of the Add button and choose the “Add As Link” menu item. This will now create a link to the file on disk and will not copy the file into your new project. Figure 1: Add as Link will create a link, not copy the file over. When this linked file is added to your project, there will be a different icon next to that file in the Solution Explorer window. This icon signifies that this is a link to a file in another folder on your hard drive.   Figure 2: The Linked file will have a different icon to show it is a link. Of course, if you have code that will not work in Silverlight or Windows Phone -- because the code has dependencies on features of .NET that are not supported on those platforms – you  can always wrap conditional compilation code around the offending code so it will be removed when compiled in those class libraries. SummaryIn this short blog entry you learned how to reuse one of your class libraries from ASP.NET, Windows Forms or WPF applications in your Silverlight or Windows Phone class libraries. You can do this without creating a maintenance nightmare by using the “Add a Link” feature of the Add Existing Item dialog. Good Luck with your Coding,Paul Sheriff ** SPECIAL OFFER FOR MY BLOG READERS **Visit http://www.pdsa.com/Event/Blog for a free video on Silverlight entitled Silverlight XAML for the Complete Novice - Part 1.

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  • Windows could not set up internet connection sharing (ICS)

    - by Osa
    I'm trying to make an ad-hoc network for personal uses.. while creating it, it was created but when i tried to turn internet sharing on i got this error Windows could not set up internet connection sharing (ICS) I looked up google what is ICS and i found that it was an option in sharing tab in my connection properties, so i tried to enable it and i got this error An error occurred while internet connection sharing was being enabled. The dependency service does not exist or has been marked for deletion. I tried to also look up google for solution for this and i ended up with nothing really, i tried to enable the required services @ services.msc for it.. rebooted and still same thing it was working a while ago (had a problem at enabling my wireless for about 2 months and i just found a solution for it..) for some reason it doesn't now

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  • ssh port forwarding / security risk

    - by jcooper
    Hi there, I want to access a web application running on a web server behind my office firewall from an external machine. We have a bastion host running sshd that is accessible from the Internet. I want to know if this solution is a bad idea: Create an account on the bastion host with shell=/bin/false and no password ('testuser') Create a ssh RSA key on the external machine Add the public RSA key to the testuser's authorized_keys file ssh to the bastion host from the external host using: ssh -N 8888:targethost:80 run my tests from the external host shut down the ssh tunnel I understand that if my RSA private key were compromised then someone could ssh to the bastion host. But are there other reasons this solution is a bad idea? thank you!

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  • Record management system java web framework

    - by Kamil Tomšík
    We're currently reconsidering technologies and frameworks to get more agile with "simple" RMS CRUD-based projects. In short, short-living things like this Right now we have a custom extension on top of SmartGWT but after some time it has proven not to be flexible enough. I also personally dislike the java-js compilation process and the whole GWT codebase. Not only is the design ugly, it also makes certain low-level js things very complicated if not completely impossible. So what I'm looking for is: closest to web as possible, like JSF or possibly Tapestry, it is very important to be able get "low" and weave framework if necessary. Happens more often than we thought. datagrid capable - Ext.js & PrimeFaces looks pretty good, Vaadin does too. db-schema generators (optional, no matter in which way) If it were only on me, I'd probably stick to Ext.js + custom rest-based java solution, possibly generated from database schema (not sure about concrete tooling yet). I only have experience with vanilla Ext.js, vanilla GWT and JSF 2.0 / Seam, so it hard for me to judge or even propose other frameworks. What would be your proposition? What are the problems you've faced? What was your solution and how hard do you think it was to deal with them in "big picture"?

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  • How do I prevent skype from starting another instance when it's already running?

    - by con-f-use
    Just a little unnecessary annoyance to fix here: Suppose you have Skype for Ubuntu running. You accidentally click on the launcher again. The way it is now, Skype starts a second instance, which promptly tells you it can't log in. There is another instance already running. To make things worse: On the next regular start of Skype it you will have to re-enter your saved password, due to the "Sign in failure". I thought this would be fixed soon but neither Canonical nor Microsoft care enough. The annoyance continues to exist for the last three updates at least. So in an approach to provide a workaround I will post what I've done to prevent this behaviour. Maybe it's useful for some of you. Maybe it will rise awareness and cause a fix. I'm happy for any better solution btw. and that's the real purpose of my question. Usually I don't answer them myself. So doesn anyone know of a better solution to fix dual instancing of Skype?

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  • sudo midnight commander

    - by mit
    I sometimes start midnight commander as superuser with the command sudo mc to do some operations on the current working directory as superuser. But this results in ~/.mc having the wrong permissions, which I need to fix manually. Any solution? Edit: I accepted an answer. I want to further add, that .mc is a directory, so my solution goes like this: $ cd ~ ~$ sudo chown -R mit.mit .mc ~$ chmod 775 .mc ~$ cd .mc ~$ chmod -R 664 .mc ~/.mc$ chmod 775 cedit It seems not to be a good idea after installing mc to use sudo on its first start .

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  • Making an AI walk on a NavigationMesh (2D/Top-Down game)

    - by Lennard Fonteijn
    For some time I have been working on a framework which should make it possible to generate 2D levels based on a set of rules specified by level designers. You can read more about it here as I won't go into details: http://www.jorisdormans.nl/article.php?ref=engineering_emergence Anyway, I'm now at the point of putting the framework to use and have trouble coming up with a solution for AI. I decided to implement a NavigationMesh in the generated levels as I already have that information to start with. Consider the following image (borrowed from http://www.david-gouveia.com/pathfinding-on-a-2d-polygonal-map/): When I run A* on the NavigationMesh, the red path would be suggested when I want to go from point A to B (either direction). However, I don't want my AI to walk that path directly and clipping corners, I'd rather want them to follow the more logical black path. How would I go about going from the Red path to the Black path, are there any algorithms for this. Which steps do I take? Is A* the proper solution for this at all? For some additional information: The proof-of-concept game is a 2D top-down game written in C#, but examples/references in any language are welcome!

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  • Slow dvd burning/reading speeds: how to solve

    - by wouter205
    I have a problem on which I'm struggling since i started using linux a year ago on my desktop, but still haven't found a solution for it. When reading or burning a dvd, the speeds are very slow (mostly under 1x) whilst I did selected the fastest speed in k3b. As such, it takes up to 40-50 minutes to burn one dvd! I read about enabling dma this post but it didn't help. This is the output for dmesg | grep -i dma > [ 0.000000] DMA 0x00000010 -> 0x00001000 [ 0.000000] DMA32 0x00001000 -> 0x00100000 [ 0.000000] DMA zone: 56 pages used for memmap [ 0.000000] DMA zone: 5 pages reserved [ 0.000000] DMA zone: 3921 pages, LIFO batch:0 [ 0.000000] DMA32 zone: 3527 pages used for memmap [ 0.000000] DMA32 zone: 254441 pages, LIFO batch:31 [ 0.000000] Policy zone: DMA32 [ 0.120356] pnp 00:01: [dma 4] [ 0.120968] pnp 00:05: [dma 2] [ 0.121421] pnp 00:06: [dma 3] [ 0.122617] pnp 00:0b: [dma 0 disabled] [ 0.852321] ata1: SATA max UDMA/133 cmd 0xec00 ctl 0xe480 bmdma 0xe000 irq 19 [ 0.852325] ata2: SATA max UDMA/133 cmd 0xe400 ctl 0xe080 bmdma 0xe008 irq 19 [ 0.861633] ata3: PATA max UDMA/133 cmd 0x1f0 ctl 0x3f6 bmdma 0xff00 irq 14 [ 0.861636] ata4: PATA max UDMA/133 cmd 0x170 ctl 0x376 bmdma 0xff08 irq 15 [ 1.329411] ata1.00: ATA-7: Maxtor 6V250F0, VA111630, max UDMA/133 [ 1.345418] ata1.00: configured for UDMA/133 [ 1.820606] ata4.00: ATAPI: PHILIPS DVDR1660P1, P1.3, max UDMA/33 [ 1.820610] ata4.00: WARNING: ATAPI DMA disabled for reliability issues. It can be enabled [ 1.820613] ata4.00: WARNING: via pata_ali.atapi_dma modparam or corresponding sysfs node. [ 1.836681] ata4.00: configured for UDMA/33 [ 12.296600] parport0: PC-style at 0x378 (0x778), irq 7, dma 3 [PCSPP,TRISTATE,COMPAT,EPP,ECP,DMA] reading the third and fourth last line, I assume there is indeed a problem with dma? edit: this question still is not solved. Could anyone come up with an other solution please? Thanks

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  • Use Outlook 2007 to connect to mail using active sync protocol

    - by Dan
    Has anyone tried connected outlook(I am running v2007 on Windows 7) to a mail service using the MS Exchange Active Sync protocol? I know it is intended for mobile devices, but to me it looks like it is becoming the latest 'de facto' mail protocol for email/calendar/contact sync'ing due to the iPhone's support for it. I just think it would be an elegant solution to get my lotus notes mail in outlook(my company uses lotus notes with traveler service installed that exposes mail over the active sync protocol so I can currently read my notes mail via iPhone). This solution would probably eliminate the need for all the hacks needed to connect outlook to 'X' mail (Gmail, notes, etc) So, maybe someone out there has tried this or knows how to do it before spend time on more researching this. Thanks!

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  • Highly scalable and dynamic "rule-based" applications?

    - by Prof Plum
    For a large enterprise app, everyone knows that being able to adjust to change is one of the most important aspects of design. I use a rule-based approach a lot of the time to deal with changing business logic, with each rule being stored in a DB. This allows for easy changes to be made without diving into nasty details. Now since C# cannot Eval("foo(bar);") this is accomplished by using formatted strings stored in rows that are then processed in JavaScript at runtime. This works fine, however, it is less than elegant, and would not be the most enjoyable for anyone else to pick up on once it becomes legacy. Is there a more elegant solution to this? When you get into thousands of rules that change fairly frequently it becomes a real bear, but this cannot be that uncommon of a problem that someone has not thought of a better way to do this. Any suggestions? Is this current method defensible? What are the alternatives? Edit: Just to clarify, this is a large enterprise app, so no matter which solution works, there will be plenty of people constantly maintaining its rules and data (around 10). Also, The data changes frequently enough to say that some sort of centralized server system is basically a must.

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  • change default port of IIS and let another process to listen on port 80 (Windows Server 2008)

    - by aleroot
    I have an installation of Windows Server 2008 running IIS 6 with a website listening on port 8080, even though I have moved the website to listen on 8080, port 80 is still kept in use by IIS (for truth by the kernel process : System - ProcId : 4). I want to let another process listen on port 80 without uninstalling or disabling IIS, I want to keep IIS listening on port 8080 and another service on port 80, is there a way to do it? I saw another similar thread here on serverfault but the solution (using httpcfg.exe delete iplisten -i 0.0.0.0:80 ) can work only in 2003 because in 2008 the utility httpcfg.exe doesn't exist and it seems that it cannot be installed ... Does anyone have a solution to get rid of the kernel listening on port 80 in Windows Server 2008 with IIS running?

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  • Creating yahoo pipe from google cal feed results in german language headings [closed]

    - by kevyn
    I'm trying to create a Yahoo pipe which combines 4 google calendar RSS feeds into a single feed sorted by date. I've created a yahoo pipe to do this (Which can be found here) The problem is, the headings all appear in German! I've searched online and the only suggestion to be made is this one which suggests that: It's actually Google doing the translation based on the requester IP and doing a geolocation based on that IP. and they suggest changing the .com to a .co.uk, however this does not work for me as yahoo pipes cannot find the feed (403 error) Does anyone have a solution? if there is another solution other than yahoo pipes then I'm all ears! here are the feeds i'm trying to combine: http://www.google.com/calendar/feeds/8tqsfkbs00erv85u2shenea60s%40group.calendar.google.com/public/basic http://www.google.com/calendar/feeds/di85fkb2u1m4si1sqar9d73ghk%40group.calendar.google.com/public/basic http://www.google.com/calendar/feeds/oq5k4pevdjgb4o59muiml72i2k%40group.calendar.google.com/public/basic http://www.google.com/calendar/feeds/f1gg60fr3esdovp15gp83traec%40group.calendar.google.com/public/basic thanks in advance :-)

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  • Building/Installing Required a52 Plugin

    - by user71139
    I am trying to compile and install the a52 plugin following the instructions from here: https://help.ubuntu.com/community/DigitalAC-3Pulseaudio This worked on Ubuntu 11.10 but gives me some errors when I try to compile the plugin on Ubuntu 12.04. I've searched for a solution however I couldn't find much on this topic in general, not to talk about a solution. I would really appreciate some help on this: bogdan@bogdan-desktop:~$ cd ~/tmp/ bogdan@bogdan-desktop:~/tmp$ cd alsa-plugins-1.0.25/ bogdan@bogdan-desktop:~/tmp/alsa-plugins-1.0.25$ make make all-recursive make[1]: Entering directory `/home/bogdan/tmp/alsa-plugins-1.0.25' Making all in oss make[2]: Entering directory `/home/bogdan/tmp/alsa-plugins-1.0.25/oss' /bin/bash ../libtool --tag=CC --mode=compile gcc -DHAVE_CONFIG_H -I. -I.. -Wall -g -I/usr/include/alsa -g -O2 -MT ctl_oss.lo -MD -MP -MF .deps/ctl_oss.Tpo -c -o ctl_oss.lo ctl_oss.c ../libtool: line 831: X--tag=CC: command not found ../libtool: line 864: libtool: ignoring unknown tag : command not found ../libtool: line 831: X--mode=compile: command not found ../libtool: line 997: *** Warning: inferring the mode of operation is deprecated.: command not found ../libtool: line 998: *** Future versions of Libtool will require --mode=MODE be specified.: command not found ../libtool: line 1141: Xgcc: command not found ../libtool: line 1141: X-DHAVE_CONFIG_H: command not found ../libtool: line 1141: X-I.: command not found ../libtool: line 1141: X-I..: command not found ../libtool: line 1141: X-Wall: command not found ../libtool: line 1141: X-g: command not found ../libtool: line 1141: X-I/usr/include/alsa: No such file or directory ../libtool: line 1141: X-g: command not found ../libtool: line 1141: X-O2: command not found ../libtool: line 1141: X-MT: command not found ../libtool: line 1141: Xctl_oss.lo: command not found ../libtool: line 1141: X-MD: command not found ../libtool: line 1141: X-MP: command not found ../libtool: line 1141: X-MF: command not found ../libtool: line 1141: X.deps/ctl_oss.Tpo: No such file or directory ../libtool: line 1141: X-c: command not found ../libtool: line 1192: Xctl_oss.lo: command not found ../libtool: line 1197: libtool: compile: cannot determine name of library object from `': command not found make[2]: *** [ctl_oss.lo] Error 1 make[2]: Leaving directory `/home/bogdan/tmp/alsa-plugins-1.0.25/oss' make[1]: *** [all-recursive] Error 1 make[1]: Leaving directory `/home/bogdan/tmp/alsa-plugins-1.0.25' make: *** [all] Error 2 bogdan@bogdan-desktop:~/tmp/alsa-plugins-1.0.25$

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  • video streaming infrastructure advice

    - by Alchemical
    We would like to set-up a live video-chat web site and are looking for basic recomendations for software and hardware set-up. Most streams will be broadcast live from a single person with a web cam, etc., and viewed by typically 1-10 people, although there could be up to 100+ viewers on the high side. Audio and video do not have to be super-high quality, but do need to be "good enough". The main point is to convey the basic info in the video (and audio). If occasionally the frame-rate drops low and then goes back to normal fairly soon, we could live with that. Budget is an issue, so we are in general looking for a lower cost solution that will give us most of what we need in temers of performance and quality. We are looking at Peer1 for co-lo. The rest of our web site will be .Net / Windows platform. We are open to looking at any platform for the best streaming solution, although our technical expertise is currently more on the Windows side.

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  • Oracle PartnerNetwork Syndicated Oracle Showcase Got a Facelift!

    - by Meghan Fritz-Oracle
    Have you seen the recently redesigned OPN Syndicated Oracle Showcase? Our new look makes it even easier to provide your customers with timely, compelling, rich web content that reinforces your expertise and the power of Oracle solutions. OPN continues to provide our Gold level and above partners this content syndication service – available at no additional charge. So, if you aren’t taking advantage of this service – what are you waiting for?Register today to get started and start enjoying these benefits: Dynamic up-to-date Oracle content featuring Applications; Database;Engineered Systems; Middleware; Servers & Storage; Optimized Solutions; and Cloud; Easy Installation – requires just a few lines of code; Seamless integration with existing website styles; Gated assets for lead generation capabilities; Statistics and metrics available to measure effectiveness; Tools and resources available to drive traffic + search engine optimization. Don’t just take our word for it! Check out the redesign for yourself! Questions?If you have questions about our redesign, or if you'd like help customizing the available solution pages, listen to the webinar replay that discusses these items in length.If you’re currently syndicating and you'd like to customize the available solution pages of your Showcase, simply log in to your OPN Syndicated Oracle Showcase Partner Console. If you'd like one-on-one assistance or technical support, don’t hesitate to contact us.Attending Oracle OpenWorld this year?The Oracle Showcase is powered by SharedVue. Stop by the OPN Lounge – a part of OPN Central @ OpenWorld – and meet with our SharedVue representative to learn more about this exciting syndication service.Can’t wait to see you shine brighter!The OPN Communications team

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  • Fix Package is in a very bad inconsistent state

    - by Benjamin Piller
    I can't update my system because it freezes while installing a third-party update (zramswap-enabler)!! Sometimes I get the following message in Update manager: Could not initialize the package information An unresolvable problem occurred while initializing the package information. Please report this bug against the 'update-manager' package and include the following error message: E:The package zramswap-enabler needs to be reinstalled, but I can't find an archive for it. I tried to remove the zramswap-enabler, but it's impossible because I get the following message: dpkg: error processing zramswap-enabler (--remove): Package is in a very bad inconsistent state - you should reinstall it before attempting a removal. Errors were encountered while processing: zramswap-enabler E: Sub-process /usr/bin/dpkg returned an error code (1) Actually i would really reinstall that package, but it is unable to do it! If i remove this third-party PPA then the system is warning me about a very very serious problem. So why can i not install/reinstall/remove/update this package and why freezes the updater if i try to update? -S O L U T I O N-: Okay! Finally i found the solution for this Problem! Step 1. Make sure that your PPA is correctly Step 2. Remove the broken package via the following command: sudo dpkg --remove --force-remove-reinstreq zramswap-enabler Step 3. install the package again (sudo apt-get install zramswap-enabler) Step 4. After restart (not necessary) you are able to install the updates correctly! Actually you can fix any "Package is in a very bad inconsistent state” Issues with this solution!!!

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  • Block spam by using geoip filter?

    - by faultyserver
    We are looking for a way to be able to block spam based on geographic location by filtering using geoip. context: we rarely have any email correspondence outside of the USA, so we would like to block all incoming email outside the US except for maybe one or two countries. After a little Googling I have found a couple of solutions that may work (or not), but I would like to know what other sysadmins are currently doing or what they would recommend as a solution. Here is what I have found so far: Using PowerDNS and its GeoIP backend it is possible to use geoip for filtering. Normally this backend is used to help distribute load as a kind of load balancing but I dont see why it couldnt be used to kill spam as well? Possibly use the Maxmind lite country database and some scripting to do a similar job. Ideally what I am looking for is a solution that would handle decent load and scale well too...aren't we all! ;) Thanks in advance for your help! :-)

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  • How to fix sudo: setreuid(ROOT_UID, user_uid): Operation not permitted error?

    - by David R.
    I am using LDAP authentication on my Ubuntu 11.10 server. I installed libpam-ldap, and configured things accordingly. It works great, except that I get this error every once in a while when I try to sudo: sudo: setreuid(ROOT_UID, user_uid): Operation not permitted I know I have sudoers set up correctly, since it works most of the time. It's not just my log in either, others have the same problem when I have it. When this error is occurring, I can't ssh in with my regular system user at all. When I sign in directly, I can't get any gnome-terminal to start. Once I restart the server, the problem goes away. 'Course, that's not a solution, if it was a prod server, I'd be in trouble. How do I fix this? Edit 3/1/12: I just figured out that if stop and start the nscd service, the problem goes away. service nscd stop service nscd start Not much of a solution since I have to be logged into the server directly, not via ssh.

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  • Mail Server using Postfix

    - by unknown (google)
    I have currently set up my web application on Amazon EC2 server. As a well known fact sending email from EC2 has a problem. As a cheap and long lasting solution instead of using "authsmtp" is it possible to rent a server and use it as a Mail Server? I am currently looking for cheap hosting which will give me root access so that it can be configured and used as a relayhost. I am curently using Postfix as MTA. Has any one implemented this before? I am curious about its feasibility of this solution. I guess common requirements are: Dedicated IP which is not black listed Open relay( open to my Server only) Any Tips for Header configurations to keep the mails out of spam folder. This is like exactly cloning authsmtp for personal use. Any suggestions for other Mail Server software instead of Postfix?

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  • Pygame surfaces and their Rects

    - by Jaka Novak
    I am trying to understand how pygame surfaces work. I am confused about Rect position of Surface object. If I try blit surface on screen at some position then Surface is drawn at right position, but Rect of the surface is still at position (0, 0)... I tried write my own surface class with new rect, but i am not sure if is that right solution. My goal is that i could move surface like image with rect.move() or something like that. If there is any solution to do that i would be happy to read it. Thanks for answer and time for reading this awful English If helps i write some code for better understanding my problem. (run it first, and then uncomment two lines of code and run again to see the diference): import pygame from pygame.locals import * class SurfaceR(pygame.Surface): def __init__(self, size, position): pygame.Surface.__init__(self, size) self.rect = pygame.Rect(position, size) self.position = position self.size = size def get_rect(self): return self.rect def main(): pygame.init() screen = pygame.display.set_mode((640, 480)) pygame.display.set_caption("Screen!?") clock = pygame.time.Clock() fps = 30 white = (255, 255, 255) red = (255, 0, 0) green = (0, 255, 0) blue = (0, 0, 255) surface = pygame.Surface((70,200)) surface.fill(red) surface_re = SurfaceR((300, 50), (100, 300)) surface_re.fill(blue) while True: for event in pygame.event.get(): if event.type == QUIT: return 0 screen.blit(surface, (100,50)) screen.blit(surface_re, surface_re.position) #pygame.draw.rect(screen, white, surface.get_rect()) #pygame.draw.rect(screen, white, surface_re.get_rect()) pygame.display.update() clock.tick(fps) if __name__ == "__main__": main()

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  • Designing a Database Application with OOP

    - by Tim C
    I often develop SQL database applications using Linq, and my methodology is to build model classes to represent each table, and each table that needs inserting or updating gets a Save() method (which either does an InsertOnSubmit() or SubmitChanges(), depending on the state of the object). Often, when I need to represent a collection of records, I'll create a class that inherits from a List-like object of the atomic class. ex. public class CustomerCollection : CoreCollection<Customer> { } Recently, I was working on an application where end-users were experiencing slowness, where each of the objects needed to be saved to the database if they met a certain criteria. My Save() method was slow, presumably because I was making all kinds of round-trips to the server, and calling DataContext.SubmitChanges() after each atomic save. So, the code might have looked something like this foreach(Customer c in customerCollection) { if(c.ShouldSave()) { c.Save(); } } I worked through multiple strategies to optimize, but ultimately settled on passing a big string of data to a SQL stored procedure, where the string has all the data that represents the records I was working with - it might look something like this: CustomerID:34567;CurrentAddress:23 3rd St;CustomerID:23456;CurrentAddress:123 4th St So, SQL server parses the string, performs the logic to determine appropriateness of save, and then Inserts, Updates, or Ignores. With C#/Linq doing this work, it saved 5-10 records / s. When SQL does it, I get 100 records / s, so there is no denying the Stored Proc is more efficient; however, I hate the solution because it doesn't seem nearly as clean or safe. My real concern is that I don't have any better solutions that hold a candle to the performance of the stored proc solution. Am I doing something obviously wrong in how I'm thinking about designing database applications? Are there better ways of designing database applications?

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  • How to emulate pressing the Close button from a script?

    - by Karthik
    I wanted Thunderbird to stay in the Background to notify me of incoming mails. After a bit of searching, I found this post. How to keep Thunderbird and Pidgin running on background? The solution is to install an addon so that when we close Thunderbird it just stays in the background. Now, to have thunderbird running at Start up we can just add it to Startup Applications. But, when I open my system, Thunderbird also gets opened and I have to manually press the close button everytime to make Thunderbird go into the background. The solution given in the above post for this problem is to select Minimize on start. But doing so affects the way in which Thunderbird works when invoked from the Messaging menu. So I deselected this option. But, if there is a way to emulate pressing the Close button from a script, I can just add that script to Startup Applications So is there a way to achieve this? Note : If there is a simpler way to solve my original problem of keeping Thunderbird in background please post that also. Many thanks.

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