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• Python Script to backup a directory

  - by rgolwalkar

  Filename:backup_ver1 import os import time 1 Using list to specify the files and directory to be backed up source = r'C:\Documents and Settings\rgolwalkar\Desktop\Desktop\Dr Py\Final_Py' 2 define backup directory destination = r'C:\Documents and Settings\rgolwalkar\Desktop\Desktop\PyDevResourse' 3 Setting the backup name targetBackup = destination + time.strftime('%Y%m%d%H%M%S') + '.rar' rar_command = "rar.exe a -ag '%s' %s" % (targetBackup, ''.join(source)) i am sure i am doing something wrong here - rar command please let me know if os.system(rar_command) == 0: print 'Successful backup to', targetBackup else: print 'Backup FAILED' O/P:- Backup FAILED winrar is added to Path and CLASSPATH under Environment variables as well - anyone else with a suggestion for backing up the directory is most welcome

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• How to avoid the focus on Delphi application ?

  - by Jean Alysson

  Hi there, I need develop an application (Delphi) that never receive the focus, I use the DLL to display the video on second monitor (I found in Torrys Delphi - Dr.SAGURA Media Player v.1.0) that receive the focus every time play the video, how avoid this ? I try : procedure TForm.WMActivate(var Msg: TWMActivate); begin WA_ACTIVE :begin Msg.Result := 0;// cancel focus end; end; Unsuccessful ! Thanks Jean Alysson

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• Extension methods for encapsulation and reusability

  - by tzaman

  In C++ programming, it's generally considered good practice to "prefer non-member non-friend functions" instead of instance methods. This has been recommended by Scott Meyers in this classic Dr. Dobbs article, and repeated by Herb Sutter and Andrei Alexandrescu in C++ Coding Standards (item 44); the general argument being that if a function can do its job solely by relying on the public interface exposed by the class, it actually increases encapsulation to have it be external. While this confuses the "packaging" of the class to some extent, the benefits are generally considered worth it. Now, ever since I've started programming in C#, I've had a feeling that here is the ultimate expression of the concept that they're trying to achieve with "non-member, non-friend functions that are part of a class interface". C# adds two crucial components to the mix - the first being interfaces, and the second extension methods: Interfaces allow a class to formally specify their public contract, the methods and properties that they're exposing to the world. Any other class can choose to implement the same interface and fulfill that same contract. Extension methods can be defined on an interface, providing any functionality that can be implemented via the interface to all implementers automatically. And best of all, because of the "instance syntax" sugar and IDE support, they can be called the same way as any other instance method, eliminating the cognitive overhead! So you get the encapsulation benefits of "non-member, non-friend" functions with the convenience of members. Seems like the best of both worlds to me; the .NET library itself providing a shining example in LINQ. However, everywhere I look I see people warning against extension method overuse; even the MSDN page itself states: In general, we recommend that you implement extension methods sparingly and only when you have to. So what's the verdict? Are extension methods the acme of encapsulation and code reuse, or am I just deluding myself?

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• auto complete asp.net

  - by lodun

  Why my autocomplete ajax script does not work: This is my WebService.cs: using System; using System.Data; using System.Web; using System.Collections; using System.Web.Services; using System.Web.Services.Protocols; using System.ComponentModel; using System.Data.SqlClient; using System.Collections.Generic; using System.Configuration; using System.Web.Script.Services; [ScriptService] [WebService(Namespace = "http://tempuri.org/")] [WebServiceBinding(ConformsTo = WsiProfiles.BasicProfile1_1)] // To allow this Web Service to be called from script, using ASP.NET AJAX, uncomment the following line. public class WebService : System.Web.Services.WebService { public WebService () { //Uncomment the following line if using designed components //InitializeComponent(); } [WebMethod] public string[] GetCountryInfo(string prefixText, int count) { string sql = "Select * from questions Where username like @prefixText"; SqlDataAdapter da = new SqlDataAdapter(sql,"estudent_piooConnectionString"); da.SelectCommand.Parameters.Add("@prefixText", SqlDbType.VarChar, 50).Value = prefixText + "%"; DataTable dt = new DataTable(); da.Fill(dt); string[] items = new string[dt.Rows.Count]; int i = 1; foreach (DataRow dr in dt.Rows) { items.SetValue(dr["username"].ToString(),i); i++; } return items; } } my css: /*AutoComplete flyout */ .autocomplete_completionListElement { margin : 0px!important; background-color : inherit; color : windowtext; border : buttonshadow; border-width : 1px; border-style : solid; cursor : 'default'; overflow : auto; height : 200px; text-align : left; list-style-type : none;padding:0px; } /* AutoComplete highlighted item */ .autocomplete_highlightedListItem { background-color: #ffff99; color: black; padding: 1px; } /* AutoComplete item */ .autocomplete_listItem { background-color : window; color : windowtext; padding : 1px; } and textbox: <asp:TextBox ID="TextBox2" runat="server"></asp:TextBox> <cc1:AutoCompleteExtender ID="AutoCompleteExtender1" CompletionListCssClass="autocomplete_completionListElement" CompletionListItemCssClass="autocomplete_listItem" CompletionSetCount="20" CompletionInterval="1000" DelimiterCharacters=";,:" CompletionListHighlightedItemCssClass="autocomplete_highlightedList MinimumPrefixLength="1" ServiceMethod="GetCountryInfo" ShowOnlyCurrentWordInCompletionListItem="true" TargetControlID="TextBox2" ServicePath="WebService.asmx" runat="server"></cc1:AutoCompleteExtender>

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• C++ Report alternatives ?

  - by brainydexter

  I came across this recommendation for reading the C++ report magazine. However, when I searched for it, i realized it has become defunct. Can someone please recommend me some other magazine / rss etc which is of the same genre ? I look forward to read more about some of the elusive and other C++ techniques that veterans are using in the field. I came across Dr. Dobb's journal - C++ feeds and I think they're pretty good too. Subscribed++ Thanks!

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• GridView in ASP.NET 2.0

  - by Subho

  How can I populate an editable Grid with data from different tables from MSSQL Server'05 writing a code behind function??? I have used: Dim conn As New SqlConnection(conn_web) Dim objCmd As New SqlDataAdapter(sql, conn) Dim oDS As New DataSet objCmd.Fill(oDS, "TAB") Dim dt As DataTable = oDS.Tables(0) Dim rowCount As Integer = dt.Rows.Count Dim dr As DataRow = dt.NewRow() If rowCount = 0 Then e.DataSource = Nothing e.DataBind() e.Focus() Else e.DataSource = dt e.DataBind() End If

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• How To Create a Flexible Plug-In Architecture?

  - by justkt

  A repeating theme in my development work has been the use of or creation of an in-house plug-in architecture. I've seen it approached many ways - configuration files (XML, .conf, and so on), inheritance frameworks, database information, libraries, and others. In my experience: A database isn't a great place to store your configuration information, especially co-mingled with data Attempting this with an inheritance hierarchy requires knowledge about the plug-ins to be coded in, meaning the plug-in architecture isn't all that dynamic Configuration files work well for providing simple information, but can't handle more complex behaviors Libraries seem to work well, but the one-way dependencies have to be carefully created. As I seek to learn from the various architectures I've worked with, I'm also looking to the community for suggestions. How have you implemented a solid plug-in architecture? What was your worst failure (or the worst failure you've seen)? What would you do if you were going to implement a new plug-in architecture? What SDK or open source project that you've worked with has the best example of a good architecture? A few examples I've been finding on my own: Perl's Module::Plugable An SO question with a list for Java (including Sever Provider Interfaces) An SO question for C++ pointing to a Dr. Dobbs article These examples seem to play to various language strengths. Is a good plugin architecture necessarily tied to the language? Is it best to use tools to create a plugin architecture, or to do it on one's own following models?

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• Primary language - C++/Qt, C#, Java?

  - by Airjoe

  I'm looking for some input, but let me start with a bit of background (for tl;dr skip to end). I'm an IT major with a concentration in networking. While I'm not a CS major nor do I want to program as a vocation, I do consider myself a programmer and do pretty well with the concepts involved. I've been programming since about 6th grade, started out with a proprietary game creation language that made my transition into C++ at college pretty easy. I like to make programs for myself and friends, and have been paid to program for local businesses. A bit about that- I wrote some programs for a couple local businesses in my senior year in high school. I wrote management systems for local shops (inventory, phone/pos orders, timeclock, customer info, and more stuff I can't remember). It definitely turned out to be over my head, as I had never had any formal programming education. It was a great learning experience, but damn was it crappy code. Oh yeah, by the way, it was all vb6. So, I've used vb6 pretty extensively, I've used c++ in my classes (intro to programming up to algorithms), used Java a little bit in another class (had to write a ping client program, pretty easy) and used Java for some simple Project Euler problems to help learn syntax and such when writing the program for the class. I've also used C# a bit for my own simple personal projects (simple programs, one which would just generate an HTTP request on a list of websites and notify if one responded unexpectedly or not at all, and another which just held a list of things to do and periodically reminded me to do them), things I would've written in vb6 a year or two ago. I've just started using Qt C++ for some undergrad research I'm working on. Now I've had some formal education, I [think I] understand organization in programming a lot better (I didn't even use classes in my vb6 programs where I really should have), how it's important to structure code, split into functions where appropriate, document properly, efficiency both in memory and speed, dynamic and modular programming etc. I was looking for some input on which language to pick up as my "primary". As I'm not a "real programmer", it will be mostly hobby projects, but will include some 'real' projects I'm sure. From my perspective: QtC++ and Java are cross platform, which is cool. Java and C# run in a virtual machine, but I'm not sure if that's a big deal (something extra to distribute, possibly a bit slower? I think Qt would require additional distributables too, right?). I don't really know too much more than this, so I appreciate any help, thanks! TL;DR Am an avocational programmer looking for a language, want quick and straight forward development, liked vb6, will be working with database driven GUI apps- should I go with QtC++, Java, C#, or perhaps something else?

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• How can I debug a win32 process that unexpectedly terminates silently?

  - by Matthew Xavier

  I have a Windows application written in C++ that occasionally evaporates. I use the word evaporate because there is nothing left behind: no "we're sorry" message from Windows, no crash dump from the Dr. Watson facility... On the one occasion the crash occurred under the debugger, the debugger did not break---it showed the application still running. When I manually paused execution, I found that my process no longer had any threads. How can I capture the reason this process is terminating?

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• Primary language - QtC++, C#, Java?

  - by Airjoe

  I'm looking for some input, but let me start with a bit of background (for tl;dr skip to end). I'm an IT major with a concentration in networking. While I'm not a CS major nor do I want to program as a vocation, I do consider myself a programmer and do pretty well with the concepts involved. I've been programming since about 6th grade, started out with a proprietary game creation language that made my transition into C++ at college pretty easy. I like to make programs for myself and friends, and have been paid to program for local businesses. A bit about that- I wrote some programs for a couple local businesses in my senior year in high school. I wrote management systems for local shops (inventory, phone/pos orders, timeclock, customer info, and more stuff I can't remember). It definitely turned out to be over my head, as I had never had any formal programming education. It was a great learning experience, but damn was it crappy code. Oh yeah, by the way, it was all vb6. So, I've used vb6 pretty extensively, I've used c++ in my classes (intro to programming up to algorithms), used Java a little bit in another class (had to write a ping client program, pretty easy) and used Java for some simple Project Euler problems to help learn syntax and such when writing the program for the class. I've also used C# a bit for my own simple personal projects (simple programs, one which would just generate an HTTP request on a list of websites and notify if one responded unexpectedly or not at all, and another which just held a list of things to do and periodically reminded me to do them), things I would've written in vb6 a year or two ago. I've just started using Qt C++ for some undergrad research I'm working on. Now I've had some formal education, I [think I] understand organization in programming a lot better (I didn't even use classes in my vb6 programs where I really should have), how it's important to structure code, split into functions where appropriate, document properly, efficiency both in memory and speed, dynamic and modular programming etc. I was looking for some input on which language to pick up as my "primary". As I'm not a "real programmer", it will be mostly hobby projects, but will include some 'real' projects I'm sure. From my perspective: QtC++ and Java are cross platform, which is cool. Java and C# run in a virtual machine, but I'm not sure if that's a big deal (something extra to distribute, possibly a bit slower? I think Qt would require additional distributables too, right?). I don't really know too much more than this, so I appreciate any help, thanks! TL;DR Am an avocational programmer looking for a language, want quick and straight forward development, liked vb6, will be working with database driven GUI apps- should I go with QtC++, Java, C#, or perhaps something else?

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• postgres subquery w/ derived column

  - by Wells

  The following query won't work, but it should be clear what I'm trying to do: split the value of 't' on space and use the last element in that array in the subquery (as it will match tl). Any ideas how to do this? Thanks! SELECT t, y, "type", regexp_split_to_array(t, ' ') as t_array, sum(dr), ( select uz from f.tfa where tl = t_array[-1] ) as uz, sc FROM padres.yd_fld WHERE y = 2010 AND pos <> 0 GROUP BY t, y, "type", sc;

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• DRBD not syncing between my nodes when IP is reset

  - by ramdaz

  I am trying to setup DRBD by following the article at http://www.howtoforge.com/setting-up-network-raid1-with-drbd-on-ubuntu-11.10-p2 I am using Ubuntu 10.04 DRBD - 8.3.11 In the first run I had everything working perfectly and when shifting the systems to a production environment I decided to restart the Meta Data creation part and start from scratch. The IPs had changed entirely in the production environment. Issuing drdbadm create-md r0 in both the servers runs successfully. But when I do "drbdadm -- --overwrite-data-of-peer primary all" on the primary it fails to start the re sync. My config file is as given below resource r0 { protocol C; syncer { rate 50M; } startup { wfc-timeout 15; degr-wfc-timeout 60; } net { cram-hmac-alg sha1; shared-secret "aklsadkjlhdbskjndsf8738734jkfkjfkjf"; } on primaryds { device /dev/drbd0; disk /dev/md2; address 172.16.7.1:7788; meta-disk internal; } on secondaryds { device /dev/drbd0; disk /dev/md2; address 172.16.7.3:7788; meta-disk internal; } } Status on primary root at primaryds:~# cat /proc/drbd version: 8.3.7 (api:88/proto:86-91) GIT-hash: ea9e28dbff98e331a62bcbcc63a6135808fe2917 build by root at primaryds, 2012-05-12 15:08:01 0: cs:WFBitMapS ro:Primary/Secondary ds:UpToDate/Inconsistent C r---- ns:0 nr:0 dw:0 dr:200 al:0 bm:0 lo:0 pe:0 ua:0 ap:0 ep:1 wo:b oos:5690352828 Status on secondary root at secondaryds:/etc/drbd.d# cat /proc/drbd version: 8.3.7 (api:88/proto:86-91) GIT-hash: ea9e28dbff98e331a62bcbcc63a6135808fe2917 build by root at secondaryds, 2012-05-12 15:25:25 0: cs:WFBitMapT ro:Secondary/Primary ds:Inconsistent/UpToDate C r---- ns:0 nr:0 dw:0 dr:0 al:0 bm:0 lo:0 pe:0 ua:0 ap:0 ep:1 wo:b oos:5690352828 Log of Primary May 30 13:42:23 primaryds kernel: [ 1584.057076] block drbd0: role( Secondary -> Primary ) disk( Inconsistent -> UpToDate ) May 30 13:42:23 primaryds kernel: [ 1584.086264] block drbd0: Forced to consider local data as UpToDate! May 30 13:42:23 primaryds kernel: [ 1584.086303] block drbd0: Creating new current UUID May 30 13:42:26 primaryds kernel: [ 1586.405551] block drbd0: drbd_sync_handshake: May 30 13:42:26 primaryds kernel: [ 1586.405564] block drbd0: self E8A075F378173D4B:0000000000000004:0000000000000000:0000000000000000 bits:1422588207 flags:0 May 30 13:42:26 primaryds kernel: [ 1586.405574] block drbd0: peer 0000000000000004:0000000000000000:0000000000000000:0000000000000000 bits:1422588207 flags:0 May 30 13:42:26 primaryds kernel: [ 1586.405582] block drbd0: uuid_compare()=2 by rule 30 May 30 13:42:26 primaryds kernel: [ 1586.405587] block drbd0: Becoming sync source due to disk states. May 30 13:42:26 primaryds kernel: [ 1586.405592] block drbd0: Writing the whole bitmap, full sync required after drbd_sync_handshake. May 30 13:42:27 primaryds kernel: [ 1588.171638] block drbd0: 5427 GB (1422588207 bits) marked out-of-sync by on disk bit-map. May 30 13:42:27 primaryds kernel: [ 1588.172769] block drbd0: conn( Connected -> WFBitMapS ) Log in Secondary May 30 13:42:24 secondaryds kernel: [ 1563.304894] block drbd0: peer( Secondary - Primary ) pdsk( Inconsistent - UpToDate ) May 30 13:42:24 secondaryds kernel: [ 1563.339674] block drbd0: drbd_sync_handshake: May 30 13:42:24 secondaryds kernel: [ 1563.339685] block drbd0: self 0000000000000004:0000000000000000:0000000000000000:0000000000000000 bits:1422588207 flags:0 May 30 13:42:24 secondaryds kernel: [ 1563.339695] block drbd0: peer E8A075F378173D4B:0000000000000004:0000000000000000:0000000000000000 bits:1422588207 flags:0 May 30 13:42:24 secondaryds kernel: [ 1563.339703] block drbd0: uuid_compare()=-2 by rule 20 May 30 13:42:24 secondaryds kernel: [ 1563.339709] block drbd0: Becoming sync target due to disk states. May 30 13:42:24 secondaryds kernel: [ 1563.339714] block drbd0: Writing the whole bitmap, full sync required after drbd_sync_handshake. May 30 13:42:26 secondaryds kernel: [ 1565.652342] block drbd0: 5427 GB (1422588207 bits) marked out-of-sync by on disk bit-map. May 30 13:42:26 secondaryds kernel: [ 1565.652965] block drbd0: conn( Connected - WFBitMapT ) The serves are not responding once it reaches this stage. Tried redoing it couple of time but noting happens. Why could the resync not be taking place? I would like some advice? Directions?

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• Looking for advice on Hyper-v storage replication

  - by Notre1

  I am designing a 2-host Hyper-V R2 cluster with 6-10 guests stored on a SMB iSCSI SAN device (probably Promise VessRAID). I will be getting at least two of the SAN devices and need to eliminate the storage a single point of failure. Ideally, that would involve real-time failover for the storage, like the Windows failover clustering does for the hosts. This design will be used at around six of our sites, and I would like to allow for us to eventually setup a cluster at colocation site and replicate each site's VMs there for DR. (Ideally a live multi-site cluster, but a manual import of the VMs would be fine for this sort of DR.) The tools that come with enterprise SANs, like EMC and NetApp, seem to be the most commonly used items for a Hyper-V cluster, but I can't afford their prices with my budget. Outside of them, the two tools that seem to be most common for Hyper-V storage replication are SteelEye (now SIOS) DataKeeper Cluster Edition and Double-Take Availability. Originally, I was planning on using Clustered Shared Volume(s) (CSV), but it seems like replication support for these is either not available or brand new in both these products. It looks like CSVs are supported in Double-Take 5.22, see this discussion, but I don't think I want to run something that new in production. Right now, it seems like the best option for me is not to implement CSVs, implement some sort of storage replication, and upgrade to CSVs at a later date once replicating them is more mature. I would love to have live migration, and CSVs are not required for live migration if you are using one LUN per VM, so I guess this is what I'll do. I would prefer to stick to the using the Microsoft Windows Server and Hyper-V tools and features as much as possible. From that standpoint, SteelEye looks more appealing than Double-Take because they make the DataKeeper volume(s) available to the Failover Clustering Manager and then failover clustering is all configured and managed through the native Microsoft tools. Double-Take says that "clustered Hyper-V hosts are not supported," and Double-Take Availability itself seems to be what is used for the actual clustering and failover. Does anyone know if any of these replication tools work with more than two hosts in the cluster? All the information I can find on the web only uses two hosts in their examples. Are there any better tools than SteelEye and Double-Take for doing what I am trying to do, which is eliminate the storage as as single point of failure? Neverfail, AppAssure, and DataCore all seem to offer similar functionality, but they don't seems to be as popular as SteelEye and Double-Take. I have seen a number of people suggest using Starwind iSCSI SAN software for the shared storage, which includes replication (and CSV replication at that). There are a couple of reasons I have not seriously considered this route: 1) The company I work for is exclusively a Dell shop and Dell does not have any servers with that I can pack with more than six 3.5" SATA drives. 2) In the future, it could be advantegous for us to not be locked into a particular brand or type of storage and third-party replication softwares all allow replication to heterogeneous storage devices. I am pretty new to iSCSI and clustering, so please let me know if it looks like I am planning something that goes against best practices or overlooking/missing something.

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• Looking for advice on Hyper-v storage replication

  - by Notre1

  I am designing a 2-host Hyper-V R2 cluster with 6-10 guests stored on a SMB iSCSI SAN device (probably Promise VessRAID). I will be getting at least two of the SAN devices and need to eliminate the storage a single point of failure. Ideally, that would involve real-time failover for the storage, like the Windows failover clustering does for the hosts. This design will be used at around six of our sites, and I would like to allow for us to eventually setup a cluster at colocation site and replicate each site's VMs there for DR. (Ideally a live multi-site cluster, but a manual import of the VMs would be fine for this sort of DR.) The tools that come with enterprise SANs, like EMC and NetApp, seem to be the most commonly used items for a Hyper-V cluster, but I can't afford their prices with my budget. Outside of them, the two tools that seem to be most common for Hyper-V storage replication are SteelEye (now SIOS) DataKeeper Cluster Edition and Double-Take Availability. Originally, I was planning on using Clustered Shared Volume(s) (CSV), but it seems like replication support for these is either not available or brand new in both these products. It looks like CSVs are supported in Double-Take 5.22, see this discussion, but I don't think I want to run something that new in production. Right now, it seems like the best option for me is not to implement CSVs, implement some sort of storage replication, and upgrade to CSVs at a later date once replicating them is more mature. I would love to have live migration, and CSVs are not required for live migration if you are using one LUN per VM, so I guess this is what I'll do. I would prefer to stick to the using the Microsoft Windows Server and Hyper-V tools and features as much as possible. From that standpoint, SteelEye looks more appealing than Double-Take because they make the DataKeeper volume(s) available to the Failover Clustering Manager and then failover clustering is all configured and managed through the native Microsoft tools. Double-Take says that "clustered Hyper-V hosts are not supported," and Double-Take Availability itself seems to be what is used for the actual clustering and failover. Does anyone know if any of these replication tools work with more than two hosts in the cluster? All the information I can find on the web only uses two hosts in their examples. Are there any better tools than SteelEye and Double-Take for doing what I am trying to do, which is eliminate the storage as as single point of failure? Neverfail, AppAssure, and DataCore all seem to offer similar functionality, but they don't seems to be as popular as SteelEye and Double-Take. I have seen a number of people suggest using Starwind iSCSI SAN software for the shared storage, which includes replication (and CSV replication at that). There are a couple of reasons I have not seriously considered this route: 1) The company I work for is exclusively a Dell shop and Dell does not have any servers with that I can pack with more than six 3.5" SATA drives. 2) In the future, it could be advantegous for us to not be locked into a particular brand or type of storage and third-party replication softwares all allow replication to heterogeneous storage devices. I am pretty new to iSCSI and clustering, so please let me know if it looks like I am planning something that goes against best practices or overlooking/missing something.

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• WiX 3 Tutorial: Generating file/directory fragments with Heat.exe

  - by Mladen Prajdic

  In previous posts I’ve shown you our SuperForm test application solution structure and how the main wxs and wxi include file look like. In this post I’ll show you how to automate inclusion of files to install into your build process. For our SuperForm application we have a single exe to install. But in the real world we have 10s or 100s of different files from dll’s to resource files like pictures. It all depends on what kind of application you’re building. Writing a directory structure for so many files by hand is out of the question. What we need is an automated way to create this structure. Enter Heat.exe. Heat is a command line utility to harvest a file, directory, Visual Studio project, IIS website or performance counters. You might ask what harvesting means? Harvesting is converting a source (file, directory, …) into a component structure saved in a WiX fragment (a wxs) file. There are 2 options you can use: Create a static wxs fragment with Heat and include it in your project. The pro of this is that you can add or remove components by hand. The con is that you have to do the pro part by hand. Automation always beats manual labor. Run heat command line utility in a pre-build event of your WiX project. I prefer this way. By always recreating the whole fragment you don’t have to worry about missing any new files you add. The con of this is that you’ll include files that you otherwise might not want to. There is no perfect solution so pick one and deal with it. I prefer using the second way. A neat way of overcoming the con of the second option is to have a post-build event on your main application project (SuperForm.MainApp in our case) to copy the files needed to be installed in a special location and have the Heat.exe read them from there. I haven’t set this up for this tutorial and I’m simply including all files from the default SuperForm.MainApp \bin directory. Remember how we created a System Environment variable called SuperFormFilesDir? This is where we’ll use it for the first time. The command line text that you have to put into the pre-build event of your WiX project looks like this: "$(WIX)bin\heat.exe" dir "$(SuperFormFilesDir)" -cg SuperFormFiles -gg -scom -sreg -sfrag -srd -dr INSTALLLOCATION -var env.SuperFormFilesDir -out "$(ProjectDir)Fragments\FilesFragment.wxs" After you install WiX you’ll get the WIX environment variable. In the pre/post-build events environment variables are referenced like this: $(WIX). By using this you don’t have to think about the installation path of the WiX. Remember: for 32 bit applications Program files folder is named differently between 32 and 64 bit systems. $(ProjectDir) is obviously the path to your project and is a Visual Studio built in variable. You can view all Heat.exe options by running it without parameters but I’ll explain some that stick out the most. dir "$(SuperFormFilesDir)": tell Heat to harvest the whole directory at the set location. That is the location we’ve set in our System Environment variable. –cg SuperFormFiles: the name of the Component group that will be created. This name is included in out Feature tag as is seen in the previous post. -dr INSTALLLOCATION: the directory reference this fragment will fall under. You can see the top level directory structure in the previous post. -var env.SuperFormFilesDir: the name of the variable that will replace the SourceDir text that would otherwise appear in the fragment file. -out "$(ProjectDir)Fragments\FilesFragment.wxs": the full path and name under which the fragment file will be saved. If you have source control you have to include the FilesFragment.wxs into your project but remove its source control binding. The auto generated FilesFragment.wxs for our test app looks like this: <?xml version="1.0" encoding="utf-8"?><Wix xmlns="http://schemas.microsoft.com/wix/2006/wi"> <Fragment> <ComponentGroup Id="SuperFormFiles"> <ComponentRef Id="cmp5BB40DB822CAA7C5295227894A07502E" /> <ComponentRef Id="cmpCFD331F5E0E471FC42A1334A1098E144" /> <ComponentRef Id="cmp4614DD03D8974B7C1FC39E7B82F19574" /> <ComponentRef Id="cmpDF166522884E2454382277128BD866EC" /> </ComponentGroup> </Fragment> <Fragment> <DirectoryRef Id="INSTALLLOCATION"> <Component Id="cmp5BB40DB822CAA7C5295227894A07502E" Guid="{117E3352-2F0C-4E19-AD96-03D354751B8D}"> <File Id="filDCA561ABF8964292B6BC0D0726E8EFAD" KeyPath="yes" Source="$(env.SuperFormFilesDir)\SuperForm.MainApp.exe" /> </Component> <Component Id="cmpCFD331F5E0E471FC42A1334A1098E144" Guid="{369A2347-97DD-45CA-A4D1-62BB706EA329}"> <File Id="filA9BE65B2AB60F3CE41105364EDE33D27" KeyPath="yes" Source="$(env.SuperFormFilesDir)\SuperForm.MainApp.pdb" /> </Component> <Component Id="cmp4614DD03D8974B7C1FC39E7B82F19574" Guid="{3443EBE2-168F-4380-BC41-26D71A0DB1C7}"> <File Id="fil5102E75B91F3DAFA6F70DA57F4C126ED" KeyPath="yes" Source="$(env.SuperFormFilesDir)\SuperForm.MainApp.vshost.exe" /> </Component> <Component Id="cmpDF166522884E2454382277128BD866EC" Guid="{0C0F3D18-56EB-41FE-B0BD-FD2C131572DB}"> <File Id="filF7CA5083B4997E1DEC435554423E675C" KeyPath="yes" Source="$(env.SuperFormFilesDir)\SuperForm.MainApp.vshost.exe.manifest" /> </Component> </DirectoryRef> </Fragment></Wix> The $(env.SuperFormFilesDir) will be replaced at build time with the directory where the files to be installed are located. There is nothing too complicated about this. In the end it turns out that this sort of automation is great! There are a few other ways that Heat.exe can compose the wxs file but this is the one I prefer. It just seems the clearest. Play with its options to see what can it do. It’s one awesome little tool.   WiX 3 tutorial by Mladen Prajdic navigation WiX 3 Tutorial: Solution/Project structure and Dev resources WiX 3 Tutorial: Understanding main wxs and wxi file WiX 3 Tutorial: Generating file/directory fragments with Heat.exe

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• LightDM will not start after stopping it

  - by Sweeters

  I am running Ubuntu 11.10 "Oneiric Ocelot", and in trying to install the nvidia CUDA developer drivers I switched to a virtual terminal (Ctrl-Alt-F5) and stopped lightdm (installation required that no X server instance be running) through sudo service lightdm stop. Re-starting lightdm with sudo service lightdm start did not work: A couple of * Starting [...] lines where displayed, but the process hanged. (I do not remember at which point, but I think it was * Starting System V runlevel compatibility. I manually rebooted my laptop, and ever since booting seems to hang, usually around the * Starting anac(h)ronistic cron [OK] log line (not consistently at that point, though). From that point on, I seem to be able to interact with my system only through a tty session (Ctrl-Alt-F1). I've tried purging and reinstalling both lightdm and gdm, as well as selecting both as the default display managers (through sudo dpkg-reconfigure [lightdm / gdm] or by manually editing /etc/X11/default-display-manager) through both apt-get and aptitude (that shouldn't make a difference anyway) after updating the packages, but the problem persists. Some of the responses I'm getting are the following: After running sudo dpkg-reconfigure lightdm (but not ... gdm) I get the following message: dpkg-maintscript-helper:warning: environment variable DPKG_MATINSCRIPT_NAME missing dpkg-maintscript-helper:warning: environment variable DPKG_MATINSCRIPT_PACKAGE missing After trying sudo service lightdm start or sudo start lightdm I get to see the boot loading screen again but nothing changes. If I go back to the tty shell I see lightdm start/running, process <num> but ps -e | grep lightdm gives no output. After trying sudo service gdm start or sudo starg gdm I get the gdm start/running, process <num> message, and gdm-binary is supposedly an active process, but all that happens is that the screen blinks a couple of times and nothing else. Other candidate solutions that I'd found on the web included running startx but when I try that I get an error output [...] Fatal server error: no screens found [...]. Moreover, I made sure that lightdm-gtk-greeter is installed but that did not help either. Please excuse my not including complete outputs/logs; I am writing this post from another computer and it's hard to manually copy the complete logs. Also, I've seen several posts that had to do with similar problems, but either there was no fix, or the one suggested did not work for me. In closing: Please help! I very much hope to avoid re-installing Ubuntu from scratch! :) Alex @mosi I did not manage to fix the NVIDIA kernel driver as per your instructions. I should perhaps mention that I'm on a Dell XPS15 laptop with an NVIDIA Optimus graphics card, and that I have bumblebee installed (which installs nvidia drivers during its installation, I believe). Issuing the mentioned commands I get the following: ~$uname -r 3.0.0-12-generic ~$lsmod | grep -i nvidia nvidia 11713772 0 ~$dmesg | grep -i nvidia [ 8.980041] nvidia: module license 'NVIDIA' taints kernel. [ 9.354860] nvidia 0000:01:00.0: power state changed by ACPI to D0 [ 9.354864] nvidia 0000:01:00.0: power state changed by ACPI to D0 [ 9.354868] nvidia 0000:01:00.0: enabling device (0006 -> 0007) [ 9.354873] nvidia 0000:01:00.0: PCI INT A -> GSI 16 (level, low) -> IRQ 16 [ 9.354879] nvidia 0000:01:00.0: setting latency timer to 64 [ 9.355052] NVRM: loading NVIDIA UNIX x86_64 Kernel Module 280.13 Wed Jul 27 16:53:56 PDT 2011 Also, running aptitude search nvidia gives me the following: p nvidia-173 - NVIDIA binary Xorg driver, kernel module a p nvidia-173-dev - NVIDIA binary Xorg driver development file p nvidia-173-updates - NVIDIA binary Xorg driver, kernel module a p nvidia-173-updates-dev - NVIDIA binary Xorg driver development file p nvidia-96 - NVIDIA binary Xorg driver, kernel module a p nvidia-96-dev - NVIDIA binary Xorg driver development file p nvidia-96-updates - NVIDIA binary Xorg driver, kernel module a p nvidia-96-updates-dev - NVIDIA binary Xorg driver development file p nvidia-cg-toolkit - Cg Toolkit - GPU Shader Authoring Language p nvidia-common - Find obsolete NVIDIA drivers i nvidia-current - NVIDIA binary Xorg driver, kernel module a p nvidia-current-dev - NVIDIA binary Xorg driver development file c nvidia-current-updates - NVIDIA binary Xorg driver, kernel module a p nvidia-current-updates-dev - NVIDIA binary Xorg driver development file i nvidia-settings - Tool of configuring the NVIDIA graphics dr p nvidia-settings-updates - Tool of configuring the NVIDIA graphics dr v nvidia-va-driver - v nvidia-va-driver - I've tried manually installing (sudo aptitude install <package>) packages nvidia-common and nvidia-settings-updates but to no avail. For example, sudo aptitude install nvidia-settings-updates returns the following log: Reading package lists... Building dependency tree... Reading state information... Reading extended state information... Initializing package states... Writing extended state information... No packages will be installed, upgraded, or removed. 0 packages upgraded, 0 newly installed, 0 to remove and 83 not upgraded. Need to get 0 B of archives. After unpacking 0 B will be used. Writing extended state information... Reading package lists... Building dependency tree... Reading state information... Reading extended state information... Initializing package states... Writing extended state information... The same happens with the Linux headers (i.e. I cannot seem to be able to install linux-headers-3.0.0-12-generic). The output of aptitude search linux-headers is as follows: v linux-headers - v linux-headers - v linux-headers-2.6 - i linux-headers-2.6.38-11 - Header files related to Linux kernel versi i linux-headers-2.6.38-11-generic - Linux kernel headers for version 2.6.38 on i A linux-headers-2.6.38-8 - Header files related to Linux kernel versi i A linux-headers-2.6.38-8-generic - Linux kernel headers for version 2.6.38 on v linux-headers-3 - v linux-headers-3.0 - v linux-headers-3.0 - i A linux-headers-3.0.0-12 - Header files related to Linux kernel versi p linux-headers-3.0.0-12-generic - Linux kernel headers for version 3.0.0 on p linux-headers-3.0.0-12-generic- - Linux kernel headers for version 3.0.0 on p linux-headers-3.0.0-12-server - Linux kernel headers for version 3.0.0 on p linux-headers-3.0.0-12-virtual - Linux kernel headers for version 3.0.0 on p linux-headers-generic - Generic Linux kernel headers p linux-headers-generic-pae - Generic Linux kernel headers v linux-headers-lbm - v linux-headers-lbm - v linux-headers-lbm-2.6 - v linux-headers-lbm-2.6 - p linux-headers-lbm-3.0.0-12-gene - Header files related to linux-backports-mo p linux-headers-lbm-3.0.0-12-gene - Header files related to linux-backports-mo p linux-headers-lbm-3.0.0-12-serv - Header files related to linux-backports-mo p linux-headers-server - Linux kernel headers on Server Equipment. p linux-headers-virtual - Linux kernel headers for virtual machines @heartsmagic I did try purging and reinstalling any nvidia driver packages, but it did not seem to make a difference, My xorg.conf file contains the following: # nvidia-xconfig: X configuration file generated by nvidia-xconfig # nvidia-xconfig: version 280.13 ([email protected]) Wed Jul 27 17:15:58 PDT 2011 Section "ServerLayout" Identifier "Layout0" Screen 0 "Screen0" 0 0 InputDevice "Keyboard0" "CoreKeyboard" InputDevice "Mouse0" "CorePointer" EndSection Section "Files" EndSection Section "InputDevice" # generated from default Identifier "Mouse0" Driver "mouse" Option "Protocol" "auto" Option "Device" "/dev/psaux" Option "Emulate3Buttons" "no" Option "ZAxisMapping" "4 5" EndSection Section "InputDevice" # generated from default Identifier "Keyboard0" Driver "kbd" EndSection Section "Monitor" Identifier "Monitor0" VendorName "Unknown" ModelName "Unknown" HorizSync 28.0 - 33.0 VertRefresh 43.0 - 72.0 Option "DPMS" EndSection Section "Device" Identifier "Device0" Driver "nvidia" VendorName "NVIDIA Corporation" EndSection Section "Screen" Identifier "Screen0" Device "Device0" Monitor "Monitor0" DefaultDepth 24 SubSection "Display" Depth 24 EndSubSection EndSection

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• "Guiding" a Domain Expert to Retire from Programming

  - by James Kolpack

  I've got a friend who does IT at a local non-profit where they're using a custom web application which is no longer supported by the company who built it. (out of business, support was too expensive, I'm not sure...) Development on this app started around 10+ years ago so the technologies being harnessed are pretty out of date now - classic asp using vbscript and SQL Server 2000. The application domain is in the realm of government bookkeeping - so even though the development team is long gone, there are often new requirements of this software. Enter the... The domain expert. This is an middle aged accounting whiz without much (or any?) prior development experience. He studied the pages, code and queries and learned how to ape the style of the original team which, believe me, is mediocre at best. He's very clever and very tenacious but has no experience in software beyond what he's picked up from this app. Otherwise, he's a pleasant guy to talk to and definitely knows his domain. My friend in IT, and probably his superiors in the company, want him out of the code. They view him as wasting his expertise on coding tasks he shouldn't be doing. My friend got me involved with a few small contracts which I handled without much problem - other than somewhat of a communication barrier with the domain expert. He explained the requirements very quickly, assuming prior knowledge of the domain which I do not have. This is partially his normal style, and I think maybe a bit of resentment from my involvement. So, I think he feels like the owner of the code and has entrenched himself in a development position. So... his coding technique. One of his latest endeavors was to make a page that only he could reach (theoretically - the security model for the system is wretched) where he can enter a raw SQL query, run it, and save the query to run again later. A report that I worked on had been originally implemented by him using 6 distinct queries, 3 or 4 temp tables to coordinate the data between the queries, and the final result obtained by importing the data from the final query into Access and doing a pivot and some formatting. It worked - well, some of the results were incorrect - but at what a cost! (I implemented the report in a single query with at least 1/10th the amount of code.) He edits code in notepad. He doesn't seem to know about online reference material for the languages. I recently read an article on Dr. Dobbs titled "What Makes Bad Programmers Different" - and instantly thought of our domain expert. From the article: Their code is large, messy, and bug laden. They have very superficial knowledge of their problem domain and their tools. Their code has a lot of copy/paste and they have very little interest in techniques that reduce it. The fail to account for edge cases, while inefficiently dealing with the general case. They never have time to comment their code or break it into smaller pieces. Empirical evidence plays no little role in their decisions. 5.5 out of 6. My friend is wanting me to argue the case to their management - specifically, I got this email from their manager to respond to: ...Also, I need to talk to you about what effect there is from Domain Expert continuing to make edits to the live environment. If that is a problem for you I need to know so I can have his access blocked. Some examples would help. In my opinion, from a technical standpoint, it's dangerous to have him making changes without any oversight. On the other hand, I'm just doing one-off contracts at this point and don't have much desire to get involved deeply enough that I'm essentially arguing as one of the Bobs from Office Space. I'd like to help my friend out - but I feel like I'm getting in the middle of a political battle. More importantly - if I do get involved and suggest that his editing privileges be removed, it needs to be handled carefully so that doesn't feel belittled. He is beyond a doubt the foremost expert on this system. I'm hoping this is familiar territory for some other stackechangers, because I'm feeling a little bewildered. How should I respond? Should I argue that he shouldn't be allowed to touch the code? Should I phrase it as "no single developer, no matter how experienced, should be working on production code unchecked"? Should I argue to keep him involved with the code, but with a review process? Should I say "glad I could help, but uh, I'm busy now!" Other options? Thanks a bunch!

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• Creating a user account on a mac you don't have admin access to [migrated]

  - by mouse

  I am trying to create a user account on a school computer so I can run processes (like compiling large libraries) with admin permissions settings. This way I can walk away and let other people user the computer, and come back after class to retrieve the binaries. Usually some smart person decides to shut the machine down, but if I had higher permissions they wouldn't be able to terminate my processes. Right now I use the guest account, which everyone has access to. If you think this is in some way unethical or a bad idea, please criticize. tl,dr I tried using the dscl series of commands in single user mode as root, as recommended by this site. It returns this error: Cannot open remote host, error: DSOpenDirServiceErr How can I create a local user on this machine to compile my code with higher permissions?

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• Do MSDTC and disaster recovery go together?

  - by DevDelivery

  Our application writes to multiple Sql Server databases within a distributed transaction. The Ops guys are saying that this messes up their disaster recovery plan because while the transactions on the live tables may commit at the same time, the log shipping on the separate databases happen at slightly different times. So in in a disaster recovery situation, there will be a few partial transactions. Is there a method for maintaining separate but synced databases in DR? Or do we have to re-design to relatively independent databases (or a single database)?

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• DRBD Not syncing between my nodes

  - by Mike Curry

  Some version info: Operating system is Ubuntu 11.10, on EC2, kernel is 3.0.0-16-virtual and the application info is: Version: 8.3.11 (api:88) GIT-hash: 0de839cee13a4160eed6037c4bddd066645e23c5 build by buildd@allspice, 2011-07-05 19:51:07 Getting some strange errors in dmesg (seen below) as well, there is no replication happening. I have made my first node primary and its showing: drbd driver loaded OK; device status: version: 8.3.11 (api:88/proto:86-96) srcversion: DA5A13F16DE6553FC7CE9B2 m:res cs ro ds p mounted fstype 0:r0 StandAlone Primary/Unknown UpToDate/DUnknown r----s ext3 my secondary node is showing: drbd driver loaded OK; device status: version: 8.3.11 (api:88/proto:86-96) srcversion: DA5A13F16DE6553FC7CE9B2 m:res cs ro ds p mounted fstype 0:r0 StandAlone Secondary/Unknown Inconsistent/DUnknown r----s Showing /proc/drbd on the master shows: version: 8.3.11 (api:88/proto:86-96) srcversion: DA5A13F16DE6553FC7CE9B2 0: cs:StandAlone ro:Primary/Unknown ds:UpToDate/DUnknown r----s ns:0 nr:0 dw:4 dr:1073 al:0 bm:0 lo:0 pe:0 ua:0 ap:0 ep:1 wo:f oos:262135964 Showing /proc/drbd on the slave shows that there is nothing being transfered... version: 8.3.11 (api:88/proto:86-96) srcversion: DA5A13F16DE6553FC7CE9B2 0: cs:StandAlone ro:Secondary/Unknown ds:Inconsistent/DUnknown r----s ns:0 nr:0 dw:0 dr:0 al:0 bm:0 lo:0 pe:0 ua:0 ap:0 ep:1 wo:f oos:262135964 Here is my config... resource r0 { protocol C; startup { wfc-timeout 15; degr-wfc-timeout 60; } net { cram-hmac-alg sha1; shared-secret "test123; } on drbd01 { device /dev/drbd0; disk /dev/xvdm; address 23.XX.XX.XX:7788; # blocked out ip meta-disk internal; } on drbd02 { device /dev/drbd0; disk /dev/xvdm; address 184.XX.XX.XX:7788; #blocked out ip meta-disk internal; } } I have run the following on the master: sudo drbdadm -- --overwrite-data-of-peer primary all There is no firewall between the systems. Here is the dmesg with some errors: [2285172.969955] drbd: initialized. Version: 8.3.11 (api:88/proto:86-96) [2285172.969960] drbd: srcversion: DA5A13F16DE6553FC7CE9B2 [2285172.969962] drbd: registered as block device major 147 [2285172.969965] drbd: minor_table @ 0xffff88000276ea00 [2285173.000952] block drbd0: Starting worker thread (from drbdsetup [1300]) [2285173.003971] block drbd0: disk( Diskless -> Attaching ) [2285173.006150] block drbd0: No usable activity log found. [2285173.006154] block drbd0: Method to ensure write ordering: flush [2285173.006158] block drbd0: max BIO size = 4096 [2285173.006165] block drbd0: drbd_bm_resize called with capacity == 524271928 [2285173.008512] block drbd0: resync bitmap: bits=65533991 words=1023969 pages=2000 [2285173.008518] block drbd0: size = 250 GB (262135964 KB) [2285173.079566] block drbd0: bitmap READ of 2000 pages took 17 jiffies [2285173.081189] block drbd0: recounting of set bits took additional 1 jiffies [2285173.081194] block drbd0: 250 GB (65533991 bits) marked out-of-sync by on disk bit-map. [2285173.081203] block drbd0: Suspended AL updates [2285173.081210] block drbd0: disk( Attaching -> UpToDate ) [2285173.081214] block drbd0: attached to UUIDs 1C1291D39584C1D1:0000000000000004:0000000000000000:0000000000000000 [2285173.095016] block drbd0: conn( StandAlone -> Unconnected ) [2285173.095046] block drbd0: Starting receiver thread (from drbd0_worker [1301]) [2285173.099297] block drbd0: receiver (re)started [2285173.099304] block drbd0: conn( Unconnected -> WFConnection ) [2285173.099330] block drbd0: bind before connect failed, err = -99 [2285173.099346] block drbd0: conn( WFConnection -> Disconnecting ) [2285173.295788] block drbd0: Discarding network configuration. [2285173.295815] block drbd0: Connection closed [2285173.295826] block drbd0: conn( Disconnecting -> StandAlone ) [2285173.295840] block drbd0: receiver terminated [2285173.295844] block drbd0: Terminating drbd0_receiver Edit: Reading some other similar issues, it was suggested to do a 'drbdadm dump all', so I figured it couldn't hurt. ubuntu@drbd01:~$ drbdadm dump all /etc/drbd.conf:19: in resource r0, on drbd01: IP 23.XX.XX.XX not found on this host. and on slave: root@drbd02:~# drbdadm dump all /etc/drbd.conf:25: in resource r0, on drbd02: IP 184.XX.XX.XX not found on this host. Strange it doesn't find its own ip, however, this is an Amazon EC2 system using an elastic IP... here are my ipconfigs for both... master: ubuntu@drbd01:~$ ifconfig eth0 Link encap:Ethernet HWaddr 22:00:0a:1c:27:11 inet addr:10.28.39.17 Bcast:10.28.39.63 Mask:255.255.255.192 inet6 addr: fe80::2000:aff:fe1c:2711/64 Scope:Link UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1 RX packets:1569 errors:0 dropped:0 overruns:0 frame:0 TX packets:1169 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 txqueuelen:1000 RX bytes:124409 (124.4 KB) TX bytes:213601 (213.6 KB) Interrupt:26 lo Link encap:Local Loopback inet addr:127.0.0.1 Mask:255.0.0.0 inet6 addr: ::1/128 Scope:Host UP LOOPBACK RUNNING MTU:16436 Metric:1 RX packets:0 errors:0 dropped:0 overruns:0 frame:0 TX packets:0 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 txqueuelen:0 RX bytes:0 (0.0 B) TX bytes:0 (0.0 B) slave: root@drbd02:~# ifconfig eth0 Link encap:Ethernet HWaddr 12:31:3f:00:14:9d inet addr:10.160.27.107 Bcast:10.160.27.255 Mask:255.255.254.0 inet6 addr: fe80::1031:3fff:fe00:149d/64 Scope:Link UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1 RX packets:915 errors:0 dropped:0 overruns:0 frame:0 TX packets:774 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 txqueuelen:1000 RX bytes:75381 (75.3 KB) TX bytes:109673 (109.6 KB) Interrupt:26 lo Link encap:Local Loopback inet addr:127.0.0.1 Mask:255.0.0.0 inet6 addr: ::1/128 Scope:Host UP LOOPBACK RUNNING MTU:16436 Metric:1 RX packets:0 errors:0 dropped:0 overruns:0 frame:0 TX packets:0 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 txqueuelen:0 RX bytes:0 (0.0 B) TX bytes:0 (0.0 B)

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• How to securely generate memorable passwords?

  - by Tim

  Whenever I need new passwords I use some tools to generate those, preferable memorable passwords, but I've been wondering how secure this might actually be. Using The xkcd random number generator is probably pretty bad, cat /dev/random is probably pretty good, but generating memorable passwords seems a bit more tricky. Whenever a program generates a memorable password, it only uses a subset of the total password space available, and it is not clear to me how big this space is. Of course a long password should help in this case, but if the `memorable' part of the program is too predictable, your passwords are not very good in the end. TL;DR: how secure are memorable password generators, given the fact that `memorable' passwords are a subset of total password space? Some tools I know of: pwgen -- seems ok, but passwords are not too memorable Mac Password Assistant - generates memorable passwords but it is unclear to me how this works.

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• How to install Mac OS X from Windows without a CD

  - by John Smith

  I have two partitions, one for windows the other for Mac OS X. Recently, my Mac OS X crashed and my partition rendered unbootable. When I insert Mac OS X's installation CD everything seems normal from startup, to choosing whether to boot from Windows or CD, until the CD boots. The screen flickers and it becomes extremely dark can barely see anything but I can see that it is booted correctly. I tried increasing brightness but that did not work. After hours of trying to read what is on the screen and guessing where to click the installation did not go through... It took more than a couple of hours so I restarted. Now the partition is accessible through Windows but is not bootable. TL;DR Is it possible to install Mac OS X on a visible partition without the CD through Windows XP?... Thanks

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• Will being a VPN Client interrupt web pages hosted by IIS?

  - by f1gm3nt3d

  We have a dedicated server that is primarily used to host our website. I've been tasked with determining the feasibility of setting up a VPN connection from it to our Internal Network at our offices for a few ease of use purposes. My concern is that if I establish this VPN connection our Website will only be available internally and not to the internet in general. I'm concerned about this because in everything I read the fact is stated that by default all network traffic is routed over the VPN connection when it's established, is this also true for applications such as IIS that are listening for incoming connections? TL;DR Will having a VPN Client up and running cause a problem with server applications that may be listening on the NIC connected to the Internet due to changes that VPN makes in the routing tables?

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• Entering Unicode Characters using NumPad in Chrome conflicting with Options Menu

  - by YatharthROCK

  TL;DR: Can't use E while entering Unicode on NumPad — conflicting with Options menu OK, so I finally got entering Hex Unicode chars on my laptop using the NumPad working using this answer from this link But when I was trying to enter the Irony Mark (? U+2E2E), as soon as I hit the E, Options opened up like in old-style menus where pressing Alt + letter brought up the relevant menu. This annoying behaviour doesn't let me enter any Unicode code-point that has an E. This works fine outside Chrome. How can I stop this?

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• Can I use nginx to start EC2 instances on demand?

  - by Gabe Hollombe

  TL;DR - Is there a way to make nginx act as an elastic load balancer that will spin up EC2 instances on demand, allowing for the case when periods of no demand mean no instances will be running? Longer explanation - I have an nginx server that proxy_pass'es requests to a server on EC2. This server doesn't get many requests, so I'd like to keep the server spun down during periods of inactivity (I already have a script to do this). Then, when the instance is spun down and nginx gets a request for that instance, it will time out when trying to get a response from it. At this point, can I somehow trigger a shell command on the server to use EC2's command line tools to spin up the instance, then re-try the user's request after it has started?

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