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  • How to 'do' ByVal in C#

    - by Jouke van der Maas
    As I understand it, C# passes parameters into methods by reference. In vb.net, you can specify this with ByVal and ByRef. The default is ByVal. Is this for compatibility with vb6, or is it just random? Also, how can I specify what to use in C#? I kind of like the idea of passing parameters by value.

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  • How to set up source control in VS2010

    - by Jouke van der Maas
    Hi, I want to set up source control for my project, but it seems like I need a server for this. I've never done this before, and I couldn't find anything helpfull yet. Is there any way to host a server locally so Visual studio can use it? Or do you know any online (free) servers I can use? By the way, if source control is not actually what i should use for keeping track of changes in my files, please suggest a better option. Thanks in advance.

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  • How to call an event when the user "finally" selects an item in a list?

    - by herzmeister der welten
    When a user clicks once on an item in a Grid or a ListBox, that item is usually selected, hence most UI frameworks have a onSelected event or the like for that. However, how can we generally call the next step when a user "finally" selects an item by e.g. double clicking an entry? You know when some popup might appear in the context of the selected item and the user can do further stuff. Strangely enough, I think I have never seen a word for that in any UI framework. onPicked, onAccepted, onChosen, onFinallySelected, onResult? All kinda awkward or too special. Any other ideas?

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  • Code Contracts: Do we have to specify Contract.Requires(...) statements redundantly in delegating me

    - by herzmeister der welten
    I'm intending to use the new .NET 4 Code Contracts feature for future development. This made me wonder if we have to specify equivalent Contract.Requires(...) statements redundantly in a chain of methods. I think a code example is worth a thousand words: public bool CrushGodzilla(string weapon, int velocity) { Contract.Requires(weapon != null); // long code return false; } public bool CrushGodzilla(string weapon) { Contract.Requires(weapon != null); // specify contract requirement here // as well??? return this.CrushGodzilla(weapon, int.MaxValue); } For runtime checking it doesn't matter much, as we will eventually always hit the requirement check, and we will get an error if it fails. However, is it considered bad practice when we don't specify the contract requirement here in the second overload again? Also, there will be the feature of compile time checking, and possibly also design time checking of code contracts. It seems it's not yet available for C# in Visual Studio 2010, but I think there are some languages like Spec# that already do. These engines will probably give us hints when we write code to call such a method and our argument currently can or will be null. So I wonder if these engines will always analyze a call stack until they find a method with a contract that is currently not satisfied? Furthermore, here I learned about the difference between Contract.Requires(...) and Contract.Assume(...). I suppose that difference is also to consider in the context of this question then?

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  • Can I pass events like key strokes to another control in Silverlight?

    - by herzmeister der welten
    Can I pass events like key strokes to another control in Silverlight? Imagine I'm in a custom control that contains a Textbox and a Treeview. I'm listening to a Key event for the TextBox. When the user pushes the Arrow Up or Arrow Down key, I want the Treeview to behave as if it's itself who received that event, i.e. it should move the current selection up or down. The user shouldn't lose focus on the TextBox though so that they can continue typing. Is this possible? I don't want to set the selection manually on the Treeview because it has no easy MoveSelectionUp() or MoveSelectionDown() method, so I would have to duplicate that functionality which is not so trivial especially when the tree is databound and loads nodes on demand.

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  • Create unique identifier for different row-groups

    - by Max van der Heijden
    I want to number certain combinations of row in a dataframe (which is ordered on ID and on Time) tc <- textConnection(' id time end_yn number abc 10 0 1 abc 11 0 2 abc 12 1 3 abc 13 0 1 def 10 0 1 def 15 1 2 def 16 0 1 def 17 0 2 def 18 1 3 ') test <- read.table(tc, header=TRUE) The goal is to create a new column ("journey_nr") that give a unique number to each row based on the journey it belongs to. Journeys are defined as a sequence of rows per id up until to end_yn == 1, also if end_ynnever becomes 1, the journey should also be numbered (see the expected outcome example). It is only possible to have end_yn == 0 journeys at the end of a collection of rows for an ID (as shown at row 4 for id 3). So either no end_yn == 1 has occured for that ID or that happened before the end_yn == 0-journey (see id == abc in the example). I know how to number using the data.table package, but I do not know which columns to combine in order to get the expected outcome. I've searched the data.table-tag on SO, but could not find a similar problem. Expected outcome: id time end_yn number journey abc 10 0 1 1 abc 11 0 2 1 abc 12 1 3 1 abc 13 0 1 2 def 10 0 1 3 def 15 1 2 3 def 16 0 1 4 def 17 0 2 4 def 18 1 3 4

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  • When inheriting a control in Silverlight, how to find out if its template has been applied?

    - by herzmeister der welten
    When inheriting a control in Silverlight, how do I find out if its template has already been applied? I.e., can I reliably get rid of my cumbersome _hasTemplateBeenApplied field? public class AwesomeControl : Control { private bool _hasTemplateBeenApplied = false; public override void OnApplyTemplate() { base.OnApplyTemplate(); this._hasTemplateBeenApplied = true; // Stuff } private bool DoStuff() { if (this._hasTemplateBeenApplied) { // Do Stuff } } }

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  • script not found or unable to stat: /usr/lib/cgi-bin/php-cgi

    - by John
    I have just seen a new series of error in the /var/log/apache2/error.log [Thu Oct 31 06:59:04 2013] [error] [client 203.197.197.18] script not found or unable to stat: /usr/lib/cgi-bin/php [Thu Oct 31 06:59:08 2013] [error] [client 203.197.197.18] script not found or unable to stat: /usr/lib/cgi-bin/php5 [Thu Oct 31 06:59:09 2013] [error] [client 203.197.197.18] script not found or unable to stat: /usr/lib/cgi-bin/php-cgi [Thu Oct 31 06:59:14 2013] [error] [client 203.197.197.18] script not found or unable to stat: /usr/lib/cgi-bin/php.cgi [Thu Oct 31 06:59:14 2013] [error] [client 203.197.197.18] script not found or unable to stat: /usr/lib/cgi-bin/php4 This server is running Ubuntu 12.04lts. I have never seen this sort of attack before, should i be concerned or securing my system in any way for them? Thanks, John

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  • SMTP Relay through exchange

    - by John
    Hi guys, We have a bit of a problem in that we want our printers to email our contractor whenever they develop a fault. The problem is on our corporate network we have no access through the firewall to the internet preventing us to use the external SMTP server. So i suppose the question is can we use our exchange server to do this? IE could I run an SMTP service that would forward to the exchange server which would then send the mail to the contractor? Any ideas welcome! Thanks John

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  • Grep a strange acirc character

    - by John Hunt
    I have this character appearing in places in some files I have:  (if you can't see it or it looks like a question mark it's the Acirc character (capital A with a circumflex over it)) I simply want to grep replace this char with a space, however when I do this: grep --color -ri  myproject.php Putty gets very confused, as does grep. As I understand it there's probably a way to use an escaped hex code with grep.. does anyone know how? EDIT: The character is showing up on my web page as a weird <?>. The http headers for the page specify utf-8 as does the meta character set and I still see the strange character. In putty it appears as a space (putty also set to utf-8.) When I copy from vim and paste into grep it simply doesn't find it. Cheers, John

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  • counting unique values based on multiple columns

    - by gooogalizer
    I am working in google spreadsheets and I am trying to do some counting that takes into consideration cell values across multiple cells in each row. Here's my table: |AUTHOR| |ARTICLE| |VERSION| |PRE-SELECTED| ANDREW GOLF STREAM 1 X ANDREW GOLF STREAM 2 X ANDREW HURRICANES 1 JOHN CAPE COD 1 X JOHN GOLF STREAM 1 (Google doc here) Each person can submit multiple articles as well as multiple versions of the same article. Sometimes different people submit different articles that happen to be identically named (Andrew and John both submitted different articles called "Golf Stream"). Multiple versions written by the same person do not count as unique, but articles with the same title written by different people do count as unique. So, I am looking to find a formula that Counts the number of unique articles that have been submitted [4] (without having to manually create extra columns for doing CONCATS, if possible) It would also be great to find formulas that: Count the number of unique articles that have been pre-selected (marked "X" in "PRE-SELECTED" column) [2] Count the number of unique articles that have only 1 version [4] Count the number of unique articles that have more than 1 of their versions pre-selected 1 Thank you so much! Nikita

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  • Looking for the best ec2 setup for 3 sites totaling in 1.5 mil in traffic monthly

    - by john h.
    I am looking to consolidate our current aws setup of 2 Large ubuntu ec2 servers and 2 large RDS server for our 3 websites that have a total of about 1.5 million hits a month and increasing every month with the majority of traffic (1 mil) to one forum site in the group and the rest of traffic to an ecommerce site and a small wordpress site. So here is my question/thought? Would it be better for us to combine the two ec2 large servers to just one and same with the 2 RDS servers so we run all three sites off one large ec2 and one RDS. -or- Should we setup maybe 2-3 smaller ec2 servers load balenced and a single RDS. -or- Something completely different setup? One concern is that if one site crashes it takes with it the others. It happened in the past but I am pretty sure its because of the forum software and not the server setup. -john

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  • Blue Screen Of Death after Graphics Card Update

    - by John Smith
    I recently installed the game watch dogs After installing it i upgraded the drivers on my graphics card AMD Radion R9 200 series via the catalyst software and since then windows has been crashing on an ad-hoc basis even when sitting idle I have recieved two different sets of errors OXOOOOOOO1 and VIDEO_SCHEDULER_INTERNAL_ERROR I am running windows 8.1 with the driver 14.4 from AMD My PC shouldnt really be having this problem as it is pretty high spec due to my work Any help would be greatly appreciated as it is driving me up the walls a bit [UPDATE 08-06-2014] I have been looking around online and have crashed the PC a few times now trying to recreate the bug I have looked into the event history viewer and gotten the following errors amdacpusrsvc acpusrsvc: IOCTL_ACPKSD_KSD_TO_USR_SVC_SET_FB_APERTURES: FAILED acpusrsvc: GfxMemServiceInitialize: FAILED amdacpusrsvc acpusrsvc: IOCTL_ACPKSD_KSD_TO_USR_SVC_SET_FB_APERTURES: FAILED amdacpusrsvc acpusrsvc: GfxMemServiceInitialize: FAILED I took some advice from the AMD forums to re-install the old drivers to see if they would work. I uninstalled the old ones first and installed directly from the CD I got the warnings below but the driver installed "successfully" The Warnings are amdacpusrsvc acpusrsvc: ConfigureFrameBufferMemory: FAILED. Hopefully this will spark something off for someone Thanks John

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  • Guestfish not found on Debian 7 when execute virt-copy-in [on hold]

    - by John Wang
    When I execute virt-copy-in command on a kvm host(Debian7.1), I got error saying "guestfish not found". However according to the dpkg comamnd, guestfish do have been installed: john@sver:~$ dpkg-query -l | grep guestfs* ii libguestfs-perl ... ii libguestfs-tools ... ii libguestfs0 ... What's the problem? Is the libguestfs-tools not the guestfish in Debian? Or it's just a broken dependency in libguestfs-tools in Debian7.1(my KVM Host)?

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  • When DNS doesn't cache

    - by John Francis
    We've had some odd DNS problems over the past couple of days that I don't fully understand. Some of our DNS names stopped resolving for some of our customers due to some 'unknown' server reconfiguration at our DNS provider. The problem seemed to be intermittent i.e. stopped working and started working within a few minutes over a couple of days. I'm no expert on DNS, but I'd have expected DNS caches to prevent this sort of thing from happening - when we need to change an IP address for a DNS record, it can take 24 hours to propogate, so how can our DNS provider be breaking name resolution intermittently for our customers so easily? Shouldn't the DNS caches kick in here? We had a similar problem about a month ago when one of their nameservers 'decided to reload the DNS database from scratch' - this broke our name resolution too. Again, why didn't the caches satisfy the name resolution requests. Any guesses would be appreciated. John

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  • Adding a single 300Gb SCSI drive to poweredge 2850

    - by John Steele
    I have a 2850 setup with 3 146Gb drives, two partitions 1 12GB system with server 2003 sp2 and 1 261Gb Data. I am strapped on disk space on the data partition having to push data around. I wanted to add a 300Gb single drive for lesser critical data, is this possible? Or is it best to add 2 300Gb drives for another RAID 1 configuration? This is my church network and while it is mission critical it is not enterprise so I can take it down for a few hours. Any pointers to documentation or direct help would be greatly appreciated. John

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  • Email censorship system

    - by user1116589
    I would like to ask you about any censorship / moderation system. Basic workflow of events: Customer sends email to [email protected] from [email protected] ACME administrator receives notification and can moderate email After moderation administrator confirm an email and send it to [email protected] John answears to [email protected] Before the email is send it is moderated again by ACME administrator What is important, that this functionality is easy to do with some CMS/CMF systems. The problem is that we do not want to use an extra domain and force customer to login an extra system. Customer should only use his own email box or desktop email application. Thank you, Tomek

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  • Syncing contacts to iOS device with Exchange

    - by flackend
    I set up a Microsoft Exchange account on my iOS device to sync my Gmail contacts. But Microsoft Exchange is ignoring phone numbers that are labeled as 'iPhone' or 'main'. For example, John Smith: On Mac and Gmail: John Smith main: 123-334-1212 home: 123-330-1002 work: 123-330-8211 iPhone: 123-778-5556 On iOS device (via Exchange sync): John Smith home: 123-330-1002 work: 123-330-8211 I'd like to sync my contacts from my Mac to iCloud and Gmail, but you can't do both: Is there a solution to sync iOS and Gmail contacts without using Exchange? Thanks for any help!

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  • The simplest Ubuntu mail server

    - by John G.
    After days of trying all sorts of tutorials I finally found a simple solution (not necessary the best) for a functional ubuntu mail server: sudo aptitude install postfix next type sudo dpkg-reconfigure postfix and configure like this: Internet Site yourdomain.com john (type your ubuntu user) yourdomain.com, localhost.localdomain, localhost No 127.0.0.0/8 [::ffff:127.0.0.0]/104 [::1]/192.168.0.1/24 (192.198.0.1 replace with your server ip address) 0 + all next install mail-stack-delivery sudo aptitude install mail-stack-delivery At this point you have a working mail server. Next, I configured SquirrelMail and start sending and receaving mail. This configuration worked with both Apache and Nginx.

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  • Why do we need Hash by key? [migrated]

    - by Royi Namir
    (i'm just trying to find what am I missing...) Assuming John have a clear text message , he can create a regular hash ( like md5 , or sha256) and then encrypt the message. John can now send Paul the message + its (clear text)hash and Paul can know if the message was altered. ( decrypt and then compare hashes). Even if an attacker can change the encrpyted data ( without decrypt) - - when paul will open the message - and recalc the hash - it wont generate the same hash as the one john sent him. so why do we need hash by key ?

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