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• Is it possible to put binary image data into html markup and then get the image displayed as usual i

  - by Joern Akkermann

  It's an important security issue and I'm sure this should be possible. A simple example: You run a community portal. Users are registered and upload their pictures. Your application gives security rules whenever a picture is allowed to be displayed. For example users must be friends on each sides by the system, in order that you can view someone else's uploaded pictures. Here comes the problem: it is possible that someone crawls the image directories of your server. But you want to protect your users from such attacks. If it's possible to put the binary data of an image directly into the HTML markup, you can restrict the user access of your image dirs the user and group your web application runs of and pass the image data to your Apache user and group directly in the HTML. The only possible weakness then is the password of the user that your web app runs as. Is there already a possibility?

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• Why do mainframe greybeards refer to DB2/zOS as "he"? [closed]

  - by Alex Nauda

  If you ask a DB2/zOS engine DBA a question about DB2's behavior, the DBA will refer to the DB2 engine as "he" much the way a sailor uses "she" to refer to his ship. For example: "Once you fill the freespace, DB2 still wants to keep those rows in cluster order in the tablespace. That's why he'll split that page in half, and you end up with lots of half-empty pages. That is, unless the cluster key of the row you've just inserted is the highest in the table, in which case he makes a new empty page, and he puts just your new row into that page. So I wouldn't have to do this REORG if you would just sort your input like I suggested." Does anyone know where this tradition comes from?

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• Clustered index dilemma - ID or sort?

  - by richardtallent

  I have a table with two very important fields: id INT identity(1,1) PRIMARY KEY identifiersortcode VARCHAR(900) My app always sorts and pages search results in the UI based on identifiersortcode, but all table joins (and they are legion) are on the id field. (Aside: yes, the sort code really is that long. There's a strong BL reason.) Also, due to O/RM use, most SELECT statements are going to pull almost every column. Currently, the clustered index is on id, but I'm wondering if the TOP / ORDER BY portion of most queries would make identifiersortcode a more attractive option as the clustered key, even considering all of the table joins going on. Inserts on the table and changes to the identifiersortcode are limited enough that changing my clustered index would be a problem for insert/update operations. Trying to make the sort code's non-clustered index a covering index (using INCLUDE) is not a good option. There are a number of large columns, and some of them have a lot of update activity.

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• Operation can only be performed on cells that belong to a DataGridView control

  - by The Demigeek

  The following code throws an InvalidOperationException with the above message and I don't understand why. My code calls the following method when the user may have made changes to the datagridview's underlying data source. The goal is to update the display with any changed data, and preserve the sort column and order. private void ReloadDataGridBindingListFromDatabase() { DataGridView dgv = myDataGridViewControl; DataGridViewColumn sortedColumn = dgv.SortedColumn; SortOrder sortOrder = dgv.SortOrder; //do stuff here to refresh dgv.DataSource if (sortedColumn != null) { //this line throws an exception sortedColumn.HeaderCell.SortGlyphDirection = sortOrder; } //etc. } Clearly, sortedColumn.HeaderCell is a cell that belongs to a DataGridView control. So why am I getting this exception? Many thanks for your input.

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• CPU temperature monitoring C#

  - by Paul

  For a programming project I would like to access the temperature readings from my CPU and GPUs. I will be using C#. From various forums I get the impression that there is specific information and developer resources you need in order to access that information for various boards. I have a MSI NF750-G55 board. MSI's website does not have any of the information I am looking for. I tried their tech support and the rep I spoke with stated they do not have any such information. There must be a way to obtain that info. Any thoughts?

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• LINQ expression precedence with Skip(), Take() and OrderBy()

  - by Robert Koritnik

  I'm using LINQ to Entities and display paged results. But I'm having issues with the combination of Skip(), Take() and OrderBy() calls. Everything works fine, except that OrderBy() is assigned too late. It's executed after result set has been cut down by Skip() and Take(). So each page of results has items in order. But ordering is done on a page handful of data instead of ordering of the whole set and then limiting those records with Skip() and Take(). How do I set precedence with these statements? My example (simplified) var query = ctx.EntitySet.Where(/* filter */).OrderBy(/* expression */); int total = query.Count(); var result = query.Skip(n).Take(x).ToList();

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• Are there any good videos out there on Java Design Patterns?

  - by Becky Reamy

  My team would like to spend some time at lunch learning design patterns. Previously, we watched some videos on Javascript which we found very useful as a way to start discussions. We would like to do the same thing with design patterns so that we don't have to spend a lot of time (outside of work) researching individual patterns in order to give a presentation. I did a little searching and came up fairly empty handed. Any help would be appreciated. It doesn't even have to be a video, even something that we can listen to (maybe a book on tape even).

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• what wrong in the program using tie and array

  - by SCNCN2010

  File : #comment1 #comment2 #comment3 #START HERE a: [email protected] b: [email protected] my perl program : use Data::Dumper; use Tie::File; tie my @array, 'Tie::File', 'ala.txt' or die $!; my $rec = 'p: [email protected]'; my $flag =1 ; my $add_flag = 0; for my $i (0..$#array) { next if ($array[$i] =~ /^\s*$/); if ( $flag == 1 ) { if ($array[$i] =~ /#START HERE/ ) { $flag = 0; } else { next ; } } if (($array[$i] cmp $rec) == 1) { splice @array, $i, 1, $rec; $add_flag = 1; last ; } } if ( $add_flag == 0 ) { my $index = $#array+1; $array[$index] = $rec ; } the recording adding end of file always . I am trying to add to middle or begin or end like aplphbetical order

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• Populating fields, input types etc using JSON

  - by Franco

  I have a form that works as follows.. Server request builds XML of the data on server side and sends xml, XSL stylesheet then transforms the XML data into the plain html page distributing the data to the relevant/desired locations of the form on the page. Person can view page and edit the populated form, submit back to DB. I think JSON is more suitable for this from what I have read. The form itself is split into 3 areas, for me this is 3 maps/associative arrays etc each with a name related to the id of an input element etc. The problem for me comes with having the JSON sent to the page, what should I do with it next in order to achieve the same result as I currently get with XML and XSL. Thanks.

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• Problem with Sphinx resultset larger than 16 MB in MySQL

  - by gmemon

  Hello All, I am accessing a large indexed text dataset using sphinxse via MySQL. The size of resultset is on the order of gigabytes. However, I have noticed that MySQL stops the query with following error whenever the dataset is larger than 16MB: 1430 (HY000): There was a problem processing the query on the foreign data source. Data source error: bad searchd response length (length=16777523) length shows the length of resultset that offended MySQL. I have tried the same query with Sphinx's standalone search program. It works fine. I have tried all possible variables in both MySQL and Sphinx, but nothing is helping. I am using Sphinx 0.9.9 rc-2 and MySQL 5.1.46. Thanks

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• can I auto update my uitextview from the value of the row of my uipickerview without pressing any se

  - by Wesley

  So I have a uipicker view, that I have managed to load some data from my db into. I would like to update a textview, which is right above the pickerview, with each changing of the row. Is that possible? If I don't have to, I would like to avoid pushing a button in order to show the respective text. Can I make it so that the value in the text field changes with the value of the rowselected in the pickerview, in real time? Any thoughts or code snippets would be appreciated. Thanks!

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• How to render the properties of the view model's base class first when using ViewData.ModelMetadata.

  - by Martin R-L

  When I use the ViewData.ModelMetadata.Properties in order to loop the properties (with an additional Where(modelMetadata => modelMetadata.ShowForEdit && !ViewData.TemplateInfo.Visited(modelMetadata))), and thereby create a generic edit view, the properties of the view model's base class are rendered last. Is it possible to use a clever OrderBy() or is there another way to first get the properties of the base class, and then the sub class'? Reverse won't do the trick since the ordering of each class' properties is perfectly fine. A workaround would of course be composition + delegation, but since we don't have mixins, it's too un-DRY IMHO, why I seek a better solution if possible.

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• Is it inmoral to put a captcha on a login form?

  - by azkotoki

  In a recent project I put a captcha test on a login form, in order to stop possible brute force attacks. The inmediate reaction of other coworkers was a request to remove it, saying that it was innapropiate for that purpose, and that it was quite exotic to see a captcha in that place. I've seen captcha images on signup, contact, password recovery forms, etc. So I personally don't see innapropiate to put a captcha also on a place like that. Well, it obviously burns down usability a little bit, but it's a matter of time and getting used to it. With the lack of a captcha test, one would have to put some sort of blacklist / account locking mechanism, which also has some drawbacks. Is it a good choice for you? Am I getting somewhat captcha-aholic and need some sort of group therapy? Thanks in advance.

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• C++ defines for a 'better' Release mode build in VS

  - by darid

  I currently use the following preprocessor defines, and various optimization settings: WIN32_LEAN_AND_MEAN VC_EXTRALEAN NOMINMAX _CRT_SECURE_NO_WARNINGS _SCL_SECURE_NO_WARNINGS _SECURE_SCL=0 _HAS_ITERATOR_DEBUGGING=0 My question is what other things do fellow SOers use, add, define, in order to get a Release Mode build from VS C++ (2008,2010) to be as performant as possible? btw, I've tried PGO etc, it does help a bit but nothing that comes to parity, also I'm not using streams, the C++ i'm talking about its more like C but making use of templates and STL algorithms. As it stands now very simple code segments flop when compared to what GCC produces on say an equivalent x86 machine running linux (2.6+ kernel) using 02. Side-Note: I believe a lot of the issues relate directly to the STL version (Dinkum) provided by MS. Could people please elaborate on experiences using STLPort etc with VS C++.

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• How can I do an SSL connection with PHP

  - by Anth0

  Hi, I need to develop a PHP class to communicate with Apple servers in order to do Push notification (APNS). I have the certificate (.pem) and I tried to follow various tutorials found on Internet but I'm still getting error trying to connect to ssl://gateway.sandbox.push.apple.com:2195 with stream socket : $apnsHost = 'gateway.sandbox.push.apple.com'; $apnsPort = 2195; $apnsCert = 'apns-dev.pem'; $streamContext = stream_context_create(); stream_context_set_option($streamContext, 'ssl', 'local_cert', $apnsCert); $apns = stream_socket_client('ssl://'.$apnsHost.':'.$apnsPort, $error, $errorString, 2, STREAM_CLIENT_CONNECT, $streamContext); A telnet on this URL works so port 2195 is opened. Openssl is activated on PHP since I get "Registered Stream Socket Transports : tcp, udp, ssl, sslv3, sslv2, tls" with a phpinfo(). My certificate is well read (PHP is_readable(certif.pem) returns true on the file) Is there anything else to activate in Apache or PHP to get it work ?

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• Perl Math::Business::EMA help

  - by Dustin

  Script pulls data from mysql: $DBI::result = $db->prepare(qq{ SELECT close FROM $table WHERE day <= '$DATE' ORDER BY day DESC LIMIT $EMA }); $DBI::result->execute(); while($row = $DBI::result->fetchrow) { print "$row\n"; }; with the following example results: 1.560 1.560 1.550... But I need to work out the EMA using Math::Business::EMA; and I'm not sure how to calculate this while maintaining the accuracy. EMA is weighted and My lack of Perl knowledge is not helping.

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• MySql left join on several regs

  - by egidiocs

  Hi there! I have this table1 idproduct(PK) | date_to_go 1 2010-01-18 2 2010-02-01 3 2010-02-21 4 2010-02-03 and this other table2 that controls date_to_go updates id | idproduct(FK) | prev_date_to_go | date_to_go | update_date 1 1 2010-01-01 2010-01-05 2009-12-01 2 1 2010-01-05 2010-01-10 2009-12-20 3 1 2010-01-10 2010-01-18 2009-12-20 4 3 2010-01-20 2010-02-03 2010-01-05 So, in this example, for table1.idproduct #1 2010-01-18 is the actual date_to_go and 2010-01-01 (table2.prev_date_to_go, first reg) is the original date_to_go . using this query select v.idproduct, v.date_to_go, p.prev_date_to_go original_date_to_go from table1 v left join produto_datas p on p.idproduto = v.idproduto group by (v.idproduto) order by v.idproduto can I assume that original_date_to_go will be the first related reg of table2? idproduct | date_to_go | original_date_to_go 1 2010-01-18 2010-01-01 2 2010-02-01 NULL 3 2010-02-21 2010-01-20 4 2010-02-03 NULL

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• How do I launch a subprocess in C# with an argv? (Or convert agrv to a legal arg string)

  - by lucas

  I have a C# command-line application that I need to run in windows and under mono in unix. At some point I want to launch a subprocess given a set of arbitrary paramaters passed in via the command line. For instance: Usage: mycommandline [-args] -- [arbitrary program] Unfortunately, System.Diagnostics.ProcessStartInfo only takes a string for args. This is a problem for commands such as: ./my_commandline myarg1 myarg2 -- grep "a b c" foo.txt In this case argv looks like : argv = {"my_commandline", "myarg1", "myarg2", "--", "grep", "a b c", "foo.txt"} Note that the quotes around "a b c" are stripped by the shell so if I simply concatenate the arguments in order to create the arg string for ProcessStartInfo I get: args = "my_commandline myarg1 myarg2 -- grep a b c foo.txt" Which is not what I want. Is there a simple way to either pass an argv to subprocess launch under C# OR to convert an arbitrary argv into a string which is legal for windows and linux shell? Any help would be greatly appreciated.

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• Kohana 3 ORM limitations

  - by yoda

  Hi, What are the limitations of Kohana 3 ORM regarding table relationships? I'm trying to modify the build-in Auth module in order to accept groups of users in adition, having now the following tables : groups groups_users roles roles_groups users user_tokens By default, this module is set to work without groups, and linking the users and roles using a third table named roles_users, but I need to add groups to it. I'm linking, as you can see by the names, the groups to users and the roles to groups, but I'm failing building the ORM code for it, so that's pretty much the question here, if ORM is limited to 2 relationships or if it can handle 3 in this case. Cheers!

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• Mercurial: What is the benefit of fixing errors in earlier versions

  - by Ken Earley

  According to the guide, under the heading: Fixing errors in earlier revisions, it states this: When you find a bug in some earlier revision you have two options: either you can fix it in the current code, or you can go back in history and fix the code exactly where you did it, which creates a cleaner history. How does going back in history make it cleaner? It still makes a new changeset at tip. Does it have something to do with what is recorded as it's parent? Is there a way to view the logs seeing the newly inserted changeset in that order? This lesson is under the main heading of Lone developer with nonlinear history. Is this good practice when working on a team?

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• Why would a FaceBook application "work" on a profile, but not a page?

  - by ed.talmadge

  I made a FaceBook application that works fine on profiles, but I can't figure out how to get it to show on a FaceBook page. For example, after I visit the application canvas URL, allow the application, then edit application settings and "add" to box and tab view... I cannot click the "plus" symbol to the left of the tabs in order to add a tab for the application. It does not appear in the list of available applications. Meanwhile, the application is working/showing up on profiles with no issues. I DID check the "Installable to Pages" checkbox on the application (authentication tab) settings. What could cause this? Here is the application canvas URL: http://apps.facebook.com/russian_girls/

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• How events are assigned in .NET

  - by Matt

  I just realized I didn't fully understand why in .NET you assign events using a += symbol. I figured this out yesterday when I needed to remove an event and without thinking I was doing someobject.onsomeevent += null thinking that would just remove the event I had previously assigned. After some investigation, I figured out I had to someobject.onsomeevent -= someeventmethod; After figuring this out, I realized I don't understand how event methods are assigned in .NET. So I have a few questions: First, does it mean that I can do someobject.onsomeevent += someeventmethod; someobject.onsomeevent += someeventothermethod; If so, when onsomeevent occurs will they both get hit, and in the order specified or simultaneously? Furthermore, how can I determine what event methods are already assigned to someobject.onsomeevent? Second, is there a way to save the events methods in some class, remove them from someobject.onsomeevent and re-assign them after some other procedures that would normally trigger the event are complete?

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• SQLAlchemy custom sorting algorithms when using SQL indexes

  - by David M

  Is it possible to write custom collation functions with indexes in SQLAlchemy? SQLite for example allows specifying the sorting function at a C level as sqlite3_create_collation(). An implementation of some of the Unicode collation algorithm has been provided by James Tauber here, which for example sorts all the "a"'s close together whether they have accents on them or not. Other examples of why this might be useful is for different alphabet orders (languages other than English) and sorting numeric values (sorting 10 after 9 rather than codepoint order.) Is this possible in SQLAlchemy? If not, is it supported by the pysqlite3 or MySQLdb modules, or for any other SQL database modules supported by python for that matter? Any information would be greatly appreciated.

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• VB.net: Is my Thread Safe List Solution actually safe?

  - by Shiftbit

  I've added teh following Extensions to my Project in order to create a thread safe list: Extensions If I want to conduct a simple operation on my list <Extension()> _ Public Sub Action(Of T)(ByVal list As List(Of T), ByVal action As Action(Of List(Of T))) SyncLock (list) action(list) End SyncLock End Sub If I want to pass it more than one parameter I could simply extend it with more items... <Extension()> _ Public Sub Action(Of T)(ByVal list As List(Of T), ByVal action As Action(Of List(Of T), T), ByVal item As T) SyncLock (list) Action(list, item) End SyncLock End Sub Actions I have created the following Action Examples: Private Sub Read(Of T)(ByVal list As List(Of T)) Console.WriteLine("Read") For Each item As T In list Console.WriteLine(item.ToString) Thread.Sleep(10) Next End Sub and also one that takes a parameter: Private Sub Write(Of T)(ByVal list As List(Of T), ByVal item As T) Thread.Sleep(100) list.Add(item) Console.WriteLine("Write") End Sub Initiating Then in my various threads I will call my Actions with: list.Action(AddressOf Read) or list.Action(AddressOf Write2, 10) Are these Extenxion methods thread safe or do you have other recommendations?

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• Web-based document merge solution?

  - by rugcutter

  We are looking for a web-based document merge solution. Our application is a web-based project management tool built using Xataface - PHP on Windows IIS + mySQL. We have a function that allows the user to generate a status report in Microsoft Word format based on data in the tool. Currently this function is implemented using LiveDocX. We have a status report template, and LiveDocX performs the merge into the template using data from our project management tool. The main drawback is LiveDocx is web-service based. We are looking to replace LiveDocX in order to reduce our dependence on the up-time of a third-party web-service that we cannot control. Does anyone have any suggestions on a web based document merge solution that I can install on my IIS or PHP based server?

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