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• WCF Duplex Interaction with Web Server

  - by Mark Struzinski

  Here is my scenario, and it is causing us a considerable amount of grief at the moment: We have a vendor web service which provides base level telephony functionality. This service has a SOAP api, which we are leveraging to build up a custom UI that is integrated into our in house web apps. The api functions on 2 levels. You make standard client calls into the service to initiate actions, such as Login, Place Call, Hang Up, etc. On a different thread, the service sends events back to the client to alert the user of things that are occurring on the system (agent successfully logged in, call was disconnected, etc). I implemented a WCF service to sit between the web server and the vendor service. This WCF service operates in duplex mode, establishing a 2 way connection with the web server. The web server makes outbound calls to the WCF service, which routes them to the vendor's web service. Events are received back to the WCF service, which passes them onto the web server via a callback channel on the WCF client. As events are received on the web server, they are placed into a hash table with the user's name as the key, and a .NET queue as the value to hold the event. Each event is enqueued to the agent who owns it. On a 2 second interval, the web page polls the web server via an ajax request to get new events for the logged in user. It hits the hash table for the user key, dequeues any events that are present, and serializes them back up to the web page. From there, they are processed in order and appropriate messages are displayed to the user. This implementation performs well in a single user scenario. The second I put more than 1 user on the system, I start getting frequent timeouts with the following CommunicationException: A connection attempt failed because the connected party did not properly respond after a period of time, or established connection failed because connected host has failed to respond We are running Windows Server 2008 R2 both servers. Both the web app and WCF service are running on .NET 3.5. The WCF service is running under the net.tcp protocol in duplex mode. The web app is ASP.NET MVC 2. Has anyone dealt with anything like this scenario? Is there a more efficient way (or a widely accepted pattern) to implement this?

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• Why doesn't VB.NET 9 have Automatic Properties like C# 3??

  - by Chris Pietschmann

  Would having a nice little feature that makes it quicker to write code like Automatic Properties fit very nicely with the mantra of VB.NET? Something like this would work perfect: Public Property FirstName() As String Get Set End Property UPDATE: VB.NET 10 (coming with Visual Studio 2010 and .NET 4.0) will have Automatic Properties. Here's a link that shows a little info about the feature: http://geekswithblogs.net/DarrenFieldhouse/archive/2008/12/01/new-features-in-vb.net-10-.net-4.0.aspx In VB.NET 10 Automatic Properties will be defines like this: Public Property CustomerID As Integer

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• Executing Stored Procedure for each InputRow + SSIS Script Component.

  - by Nev_Rahd

  Hello, In my Script Component, am trying to execute Stored Procedure = which return multiple rows = of which need to generate output rows. Code as below: /* Microsoft SQL Server Integration Services Script Component * Write scripts using Microsoft Visual C# 2008. * ScriptMain is the entry point class of the script.*/ using System; using System.Data; using System.Data.SqlClient; using Microsoft.SqlServer.Dts.Pipeline.Wrapper; using Microsoft.SqlServer.Dts.Runtime.Wrapper; [Microsoft.SqlServer.Dts.Pipeline.SSISScriptComponentEntryPointAttribute] public class ScriptMain : UserComponent { SqlConnection cnn = new SqlConnection(); IDTSConnectionManager100 cnManager; //string cmd; SqlCommand cmd = new SqlCommand(); public override void AcquireConnections(object Transaction) { cnManager = base.Connections.myConnection; cnn = (SqlConnection)cnManager.AcquireConnection(null); } public override void PreExecute() { base.PreExecute(); } public override void PostExecute() { base.PostExecute(); } public override void InputRows_ProcessInputRow(InputRowsBuffer Row) { while(Row.NextRow()) { DataTable dt = new DataTable(); cmd.Connection = cnn; cmd.CommandText = "OSPATTRIBUTE_GetOPNforOP"; cmd.CommandType = CommandType.StoredProcedure; cmd.Parameters.Add("@NK", SqlDbType.VarChar).Value = Row.OPNK.ToString(); cmd.Parameters.Add("@EDWSTARTDATE", SqlDbType.DateTime).Value = Row.EDWEFFECTIVESTARTDATETIME; SqlDataAdapter adapter = new SqlDataAdapter(cmd); adapter.Fill(dt); foreach (DataRow dtrow in dt.Rows) { OutputValidBuffer.AddRow(); OutputValidBuffer.OPNK = Row.OPNK; OutputValidBuffer.OSPTYPECODE = Row.OSPTYPECODE; OutputValidBuffer.ORGPROVTYPEDESC = Row.ORGPROVTYPEDESC; OutputValidBuffer.HEALTHSECTORCODE = Row.HEALTHSECTORCODE; OutputValidBuffer.HEALTHSECTORDESCRIPTION = Row.HEALTHSECTORDESCRIPTION; OutputValidBuffer.EDWEFFECTIVESTARTDATETIME = Row.EDWEFFECTIVESTARTDATETIME; OutputValidBuffer.EDWEFFECTIVEENDDATETIME = Row.EDWEFFECTIVEENDDATETIME; OutputValidBuffer.OPQI = Row.OPQI; OutputValidBuffer.OPNNK = dtrow[0].ToString(); OutputValidBuffer.OSPNAMETYPECODE = dtrow[1].ToString(); OutputValidBuffer.NAMETYPEDESC = dtrow[2].ToString(); OutputValidBuffer.OSPNAME = dtrow[3].ToString(); OutputValidBuffer.EDWEFFECTIVESTARTDATETIME1 = Row.EDWEFFECTIVESTARTDATETIME; OutputValidBuffer.EDWEFFECTIVEENDDATETIME1 = Row.EDWEFFECTIVEENDDATETIME; OutputValidBuffer.OPNQI = dtrow[6].ToString(); } } } public override void ReleaseConnections() { cnManager.ReleaseConnection(cnn); } } This is always skipping the first row. while(Row.NextRow()) is always bringing the second row of the input buffer. What am I doing wrong. Thanks

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• Running same powershell script multiple asynchronous times with separate runspace

  - by teqnomad

  Hi, I have a powershell script which is called by a batch script which is called by Trap Receiver (which also passes environment variables) (running on windows 2008). The traps are flushed out at times in sets of 2-4 trap events, and the batch script will echo the trap details for each message to a logfile, but the powershell script on the next line of the batch script will only appear to process the first trap message (the powershell script writes to the same logfile). My interpetation is that the defaultrunspace is common to all iterations of the script running and this is why the others appear to be ignored. I've tried adding "-sta" when I invoke the powershell script using "powershell.exe -command", but this didn't help. I've researched and found a method using C# but I don't know this language, and busy enough learning powershell, so hoping to find a more direct solution especially as interleaving a "wrapper" between batch and powershell will involve passing the environment variables. http://www.codeproject.com/KB/threads/AsyncPowerShell.aspx I've hunted through stackoverflow, and again the only question of similar vein was using C#. Any suggestions welcome. Some script background: The powershell script is actually a modification of a great script found at gregorystrike website - cant post the link as I'm limited to one link but its the one for Lefthand arrays. Lots of mods so it can do multiple targets from one .ini file, taking in the environment variables, and options to run portions of the script interactively with winform. But you can see the gist of the original script. The batch script is pretty basic. The keys things are I'm trying to filter out trap noise using the :~ operator, and I tried -sta option to see if this would compartmentalise the powershell script. set debug=off set CMD_LINE_ARGS="%*" set LHIPAddress="%2" set VARBIND8="%8" shift shift shift shift shift shift shift set CHASSIS="%9" echo %DATE% %TIME% "Trap Received: %LHIPAddress% %CHASSIS% %VARBIND8%" >> C:\Logs\trap_out.txt set ACTION="%VARBIND8:~39,18%" echo %DATE% %TIME% "Action substring is %ACTION%" 2>&1 >> C:\Logs\trap_out.txt if %ACTION%=="Remote Copy Volume" ( echo Prepostlefthand_env_v2.9 >> C:\Logs\trap_out.txt c:\Windows\System32\WindowsPowerShell\v1.0\PowerShell.exe -sta -executionpolicy unrestricted -command " & 'C:\Scripts\prepostlefthand_env_v2.9.ps1' Backupsettings.ini ALL" 2>&1 >> C:\Logs\trap_out.txt ) ELSE ( echo %DATE% %TIME% Action substring is %ACTION% so exiting" 2>&1 >> C:\Logs\trap.out.txt ) exit

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• MPVolume on ipodtouch/iphone

  - by blacksheep

  hi, i'm using the code of this link: http://blog.stormyprods.com/2008/09/proper-usage-of-mpvolumeview-class.html it is working on an ipod touch, but NOT on iphones. what can be the reason for that?

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• mysql_connect() causes page to not display (WAMP)

  - by VOIDHand

  I currently have a website running MySQL and PHP in which this is all working. I've tried installing WAMPServer to be able to work on the site on my own computer, but I have been having issues trying to get the site to work correctly. HTML and PHP files work correctly (by going to http://localhost/index.php, etc.). But some of the pages display "This Webpage is not available" (in Chrome) or "Internet Explorer cannot display this webpage", which leads me to think there is an error is the server, as when the page doesn't exist, it typically dispays "Oops! This link appears to be broken" or IE's standard 404 page. Each page in my site has an include() call to set up an instance of a class to handle all database transactions. This class opens the connection to the database in its constructor. I have found commenting out the contents of the constructor will allow the page to load, although this understandably causes errors later in the page. This is the contents of the included file: class dbAccess { private $db; function __construct() { $this->db = mysql_connect("externalURL","user","password") or die ("Connection for database not found."); mysql_select_db("dbName", $this->db) or die ("Database not selected"); } ... } As a note for what's happening here. I'm attempting to use the database on my site, rather than the local machine. The actual values of externalURL, dbName, user, and password work when I plug them into my database software and the file fine of the site, so I don't think the issue is with those values themselves, but rather some setting with Apache or Wamp. The issue persists if I try a local database as well. This is an excerpt of my Apache error log for one attempt at logging into the site: [Wed Apr 14 15:32:54 2010] [notice] Parent: child process exited with status 255 -- Restarting. [Wed Apr 14 15:32:54 2010] [notice] Apache/2.2.11 (Win32) PHP/5.3.0 configured -- resuming normal operations [Wed Apr 14 15:32:54 2010] [notice] Server built: Dec 10 2008 00:10:06 [Wed Apr 14 15:32:54 2010] [notice] Parent: Created child process 1756 [Wed Apr 14 15:32:55 2010] [notice] Child 1756: Child process is running [Wed Apr 14 15:32:55 2010] [notice] Child 1756: Acquired the start mutex. [Wed Apr 14 15:32:55 2010] [notice] Child 1756: Starting 64 worker threads. [Wed Apr 14 15:32:55 2010] [notice] Child 1756: Starting thread to listen on port 80. For the first line, isLoggedIn (from the first line) is a method of the class above. Assuming that the connection works, this error should disappear. I've tried searching for solutions online, but haven't been able to find anything to help. If you need any further information to help solve this issue, feel free to ask for it. (One more note, I don't even have Skype on this computer, so I can't see it being an issue, as this conflict seems to be the default response for any Wamp issue.) [Edit: Removed entry from the error log as it was solved as an unrelated issue]

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• How to split HTML code with javascript or JQuery

  - by Dean

  Hi I'm making a website using JSP and servlets and I have to now break up a list of radio buttons to insert a textarea and a button. I have got the button and textarea to hide and show when you click on the radio button it shows the text area and button. But this only appears at the top and when there are hundreds on the page this will become awkward so i need a way for it to appear underneath. Here is what my HTML looks like when complied: <form action="addSpotlight" method="POST"> <table> <tr><td><input type="radio" value="29" name="publicationIDs" ></td><td>A System For Dynamic Server Allocation in Application Server Clusters, IEEE International Symposium on Parallel and Distributed Processsing with Applications, 2008</td> </tr> <tr><td><input type="radio" value="30" name="publicationIDs" ></td><td>Analysing BitTorrent's Seeding Strategies, 7th IEEE/IFIP International Conference on Embedded and Ubiquitous Computing (EUC-09), 2009</td> </tr> <tr><td><input type="radio" value="31" name="publicationIDs" ></td><td>The Effect of Server Reallocation Time in Dynamic Resource Allocation, UK Performance Engineering Workshop 2009, 2009</td> </tr> <tr><td><input type="radio" value="32" name="publicationIDs" ></td><td>idk, hello, 1992</td> </tr> <tr><td><input type="radio" value="33" name="publicationIDs" ></td><td>sad, safg, 1992</td> </tr> <div class="abstractWriteup"><textarea name="abstract"></textarea> <input type="submit" value="Add Spotlight"></div> </table> </form> Now here is what my JSP looks like: <form action="addSpotlight" method="POST"> <table> <%int i = 0; while(i<ids.size()){%> <tr><td><input type="radio" value="<%=ids.get(i)%>" name="publicationIDs" ></td><td><%=info.get(i)%></td> </tr> <%i++; }%> <div class="abstractWriteup"><textarea name="abstract"></textarea> <input type="submit" value="Add Spotlight"></div> </table> </form> Thanks in Advance Dean

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• WatiN, VBScript

  - by little_devil

  I am using WatiN for my web tests. In one of my web pages, I have a VBScript function which opens a dialogbox. I am unable to access it using WatiN. I tried using WatiNTestRecorder; it was unsuccessful. I tried this also: http://blogs.dovetailsoftware.com/blogs/kmiller/archive/2008/07/16/scenario-testing-with-watin.aspx, unsuccessful again.

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• How to I serialize a large graph of .NET object into a SQL Server BLOB without creating a large bu

  - by Ian Ringrose

  We have code like: ms = New IO.MemoryStream bin = New System.Runtime.Serialization.Formatters.Binary.BinaryFormatter bin.Serialize(ms, largeGraphOfObjects) dataToSaveToDatabase = ms.ToArray() // put dataToSaveToDatabase in a Sql server BLOB But the memory steam allocates a large buffer from the large memory heap that is giving us problems. So how can we stream the data without needing enough free memory to hold the serialized objects. I am looking for a way to get a Stream from SQL server that can then be passed to bin.Serialize() so avoiding keeping all the data in my processes memory. Likewise for reading the data back... Some more background. This is part of a complex numerical processing system that processes data in near real time looking for equipment problems etc, the serialization is done to allow a restart when there is a problem with data quality from a data feed etc. (We store the data feeds and can rerun them after the operator has edited out bad values.) Therefore we serialize the object a lot more often then we de-serialize them. The objects we are serializing include very large arrays mostly of doubles as well as a lot of small “more normal” objects. We are pushing the memory limit on a 32 bit system and make the garage collector work very hard. (Effects are being made elsewhere in the system to improve this, e.g. reusing large arrays rather then create new arrays.) Often the serialization of the state is the last straw that courses an out of memory exception; our peak memory usage is while this serialization is being done. I think we get large memory pool fragmentation when we de-serialize the object, I expect there are also other problem with large memory pool fragmentation given the size of the arrays. (This has not yet been investigated, as the person that first looked at this is a numerical processing expert, not a memory management expert.) Are customers use a mix of Sql Server 2000, 2005 and 2008 and we would rather not have different code paths for each version of Sql Server if possible. We can have many active models at a time (in different process, across many machines), each model can have many saved states. Hence the saved state is stored in a database blob rather then a file. As the spread of saving the state is important, I would rather not serialize the object to a file, and then put the file in a BLOB one block at a time. Other related questions I have asked How to Stream data from/to SQL Server BLOB fields? Is there a SqlFileStream like class that works with Sql Server 2005?

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• how to translate this hpricot code to nokogiri ?

  - by wefwgeweg

  Hpricot(html).inner_text.gsub("\r"," ").gsub("\n"," ").split(" ").join(" ") hpricot = Hpricot(html) hpricot.search("script").remove hpricot.search("link").remove hpricot.search("meta").remove hpricot.search("style").remove found it on http://www.savedmyday.com/2008/04/25/how-to-extract-text-from-html-using-rubyhpricot/

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• Windows 7 Status Menu style Window

  - by Mason Blier

  Hey all, I'm working on a project and I'm wondering how to get a type of window common in Windows's wireless controls, as shown in the screen shot below: http://cybernetnews.com/wp-content/uploads/2008/10/windows-7-wireless.jpg There's no close or maximize buttons, but the border is still present. My tools include Expression Blend 3 and Visual Studio 08. I was also wondering what the font used on these are, as it doesn't seem to be the normal Tahoma found in Office 7. Thanks, Mason

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• Partitioning mySQL tables that has foreign keys?

  - by Industrial

  Hi! What would be an appropriate way to do this, since mySQL obviously doesnt enjoy this. To leave either partitioning or the foreign keys out from the database design would not seem like a good idea to me. I'll guess that there is a workaround for this? Update 03/24: http://opendba.blogspot.com/2008/10/mysql-partitioned-tables-with-trigger.html http://stackoverflow.com/questions/1537219/how-to-handle-foreign-key-while-partitioning Thanks!

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• .NET JIT Code Cache leaking?

  - by pitchfork

  We have a server component written in .Net 3.5. It runs as service on a Windows Server 2008 Standard Edition. It works great but after some time (days) we notice massive slowdowns and an increased working set. We expected some kind of memory leak and used WinDBG/SOS to analyze dumps of the process. Unfortunately the GC Heap doesn’t show any leak but we noticed that the JIT code heap has grown from 8MB after the start to more than 1GB after a few days. We don’t use any dynamic code generation techniques by our own. We use Linq2SQL which is known for dynamic code generation but we don’t know if it can cause such a problem. The main question is if there is any technique to analyze the dump and check where all this Host Code Heap blocks that are shown in the WinDBG dumps come from? [Update] In the mean time we did some more analysis and had Linq2SQL as probable suspect, especially since we do not use precompiled queries. The following example program creates exactly the same behaviour where more and more Host Code Heap blocks are created over time. using System; using System.Linq; using System.Threading; namespace LinqStressTest { class Program { static void Main(string[] args) { for (int i = 0; i < 100; ++ i) ThreadPool.QueueUserWorkItem(Worker); while(runs < 1000000) { Thread.Sleep(5000); } } static void Worker(object state) { for (int i = 0; i < 50; ++i) { using (var ctx = new DataClasses1DataContext()) { long id = rnd.Next(); var x = ctx.AccountNucleusInfos.Where(an => an.Account.SimPlayers.First().Id == id).SingleOrDefault(); } } var localruns = Interlocked.Add(ref runs, 1); System.Console.WriteLine("Action: " + localruns); ThreadPool.QueueUserWorkItem(Worker); } static Random rnd = new Random(); static long runs = 0; } } When we replace the Linq query with a precompiled one, the problem seems to disappear.

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• ServiceController.Stop() doesn't appear to be stopping anything

  - by peacedog

  My dev box is a Windows 7 (x64) machine. I've got some code (C#, .net 2.0) that in certain circumstances, checks to see if a service is running and then stops it. ServiceController matchedService = //My Service! //If statements and such matchedService.Stop(); matchedService.WaitForStatus(ServiceControllerStatus.Stopped); Now, I can verify MyService is in fact installed and running. I can tell you I am running Visual Studio 2008 as an administrator while debugging. I can also verify that after a couple of If statements, I wind up at the .Stop() and .WaitForStatus() portion of the programming. I do know that if step over the .Stop() call, the service itself just keeps running (looking at it in Services, though it occurs to me perhaps I should grab a better tool for this. I'm sure there's some sysinternals tool that might give me more information). As I step over the .WaitForStatus() call, I basically wind up waiting for the stopped status. . . forever. Well, I let it sit there for over 15 minutes yesterday (twice) and nothing happens. We never make it to the next line of code. It feels exactly like Bowie's Space Oddity (you know the part I am talking about). There's a lotta things about MyService you don't know anything about. Things you wouldn't understand. Things you couldn't. . . let me state this plainly. No services depend on MyService and MyService depends on no other services. Addendum MyOtherService and SonOfMyService both seem to behave correctly at this point in the code. All of these services share the same characteristics (they're our own services we hatched in a secret lab and have no dependencies). Is it possible there is something wrong with the MyService install or something? I do know that if I stop debugging at this point, MyService is still listed as running in Services (even after hitting refresh). If I try to restart it then (or run my application again and get to this point), I get a message about it not being able to accept control messages. After that, the service shows up as stopped and I can start it normally. Why isn't the service being stopped? Is this a quirk of win 7? A failing on my part to understand the ServiceController, or Win Services in general?

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• Grouping geographical shapes

  - by grenade

  I am using Dundas Maps and attempting to draw a map of the world where countries are grouped into regions that are specific to a business implementation. I have shape data (points and segments) for each country in the world. I can combine countries into regions by adding all points and segments for countries within a region to a new region shape. foreach(var region in GetAllRegions()){ var regionShape = new Shape { Name = region.Name }; foreach(var country in GetCountriesInRegion(region.Id)){ var countryShape = GetCountryShape(country.Id); regionShape.AddSegments(countryShape.ShapeData.Points, countryShape.ShapeData.Segments); } map.Shapes.Add(regionShape); } The problem is that the country border lines still show up within a region and I want to remove them so that only regional borders show up. Dundas polygons must start and end at the same point. This is the case for all the country shapes. Now I need an algorithm that can: Determine where country borders intersect at a regional border, so that I can join the regional border segments. Determine which country borders are not regional borders so that I can discard them. Sort the resulting regional points so that they sequentialy describe the shape boundaries. Below is where I have gotten to so far with the map. You can see that the country borders still need to be removed. For example, the border between Mongolia and China should be discarded whereas the border between Mongolia and Russia should be retained. The reason I need to retain a regional border is that the region colors will be significant in conveying information but adjacent regions may be the same color. The regions can change to include or exclude countries and this is why the regional shaping must be dynamic. EDIT: I now know that I what I am looking for is a UNION of polygons. David Lean explains how to do it using the spatial functions in SQL Server 2008 which might be an option but my efforts have come to a halt because the resulting polygon union is so complex that SQL truncates it at 43,680 characters. I'm now trying to either find a workaround for that or find a way of doing the union in code.

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• Execute SQL SP in Excel VBA

  - by TheOCD

  HI I am having problem with getting all the columns back when i execute following code in excel vba. I only get 6 out of 23 columns back. Connection, command etc works fine (i can see exec command in the SQL Profiler), data headers are created for all 23 columns but i only get data for 6 column. Side Note: it's not prod level code, have missed out error handling on purpose, sp works fine in SQL management studio, ASP.Net, C# win form app, it is for Excel 2003 connecting to SQL 2008. Can someone help me troubleshoot it? Dim connection As ADODB.connection Dim recordset As ADODB.recordset Dim command As ADODB.command Dim strProcName As String 'Stored Procedure name Dim strConn As String ' connection string. Dim selectedVal As String 'Set ADODB requirements Set connection = New ADODB.connection Set recordset = New ADODB.recordset Set command = New ADODB.command If Workbooks("Book2.xls").MultiUserEditing = True Then MsgBox "You do not have Exclusive access to the workbook at this time." & _ vbNewLine & "Please have all other users close the workbook and then try again.", vbOKOnly + vbExclamation Exit Sub Else On Error Resume Next ActiveWorkbook.ExclusiveAccess 'On Error GoTo No_Bugs End If 'set the active sheet Set oSht = Workbooks("Book2.xls").Sheets(1) 'get the connection string, if empty just exit strConn = ConnectionString() If strConn = "" Then Exit Sub End If ' selected value, if <NOTHING> just exit selectedVal = selectedValue() If selectedVal = "<NOTHING>" Then Exit Sub End If If Not oSht Is Nothing Then 'Open database connection connection.ConnectionString = strConn connection.Open ' set command stuff. command.ActiveConnection = connection command.CommandText = "GetAlbumByName" command.CommandType = adCmdStoredProc command.Parameters.Refresh command.Parameters(1).Value = selectedVal 'Execute stored procedure and return to a recordset Set recordset = command.Execute() If recordset.BOF = False And recordset.EOF = False Then Sheets("Sheet2").[A1].CopyFromRecordset recordset ' Create headers and copy data With Sheets("Sheet2") For Column = 0 To recordset.Fields.Count - 1 .Cells(1, Column + 1).Value = recordset.Fields(Column).Name Next .Range(.Cells(1, 1), .Cells(1, recordset.Fields.Count)).Font.Bold = True .Cells(2, 1).CopyFromRecordset recordset End With Else MsgBox "b4 BOF or after EOF.", vbOKOnly + vbExclamation End If 'Close database connection and clean up If CBool(recordset.State And adStateOpen) = True Then recordset.Close Set recordset = Nothing If CBool(connection.State And adStateOpen) = True Then connection.Close Set connection = Nothing Else MsgBox "oSheet2 is Nothing.", vbOKOnly + vbExclamation End If

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• WPF Application Slow Unresponsive when demonstrating using remote sharing software

  - by Kev

  After spending 14 hours on this I think its time to share my woes and see if anyone has experienced this issue before. Ill describe the issue and tests I have done to rule out certain things. Ok so I have a WPF application which loads in data from an SQL database. I am using DevExpress Components for datagrids, ribbons etc.. and FluentNhibernate to provide a session for database operations. I am also using log4net to log events to a textfile. Using the application on my laptop with SQL Express 2008 works fine.. the application starts up, retrieves 1000 records and I can tab through the controls on the ribbon. Now, I decided to demo the application to a third party and used remote login/sharing software online to share my desktop with the other person so as I could load the application on my laptop and they could view me using the application. Now, the application takes approx 45 seconds to load... 30 seconds with a blank database where as, when im not sharing out my screen using the online software the application loads in about 7-10 seconds. As well as that, even using the controls in the application during the demo were very sticky, slow and unresponsive. During the sharing session though however I was able to use other applications without any problems.. everything else worked fine. But I cannot understand how my application works ok under normal conditions , even browsing the net at the same time etc... BUT totally fails to perform correctly when I am sharing a session with another user... the CPU usage shot up to 100% too at times when the application was trying to start up... Please see below a list of 3rd party dlls I am using as references in my project. DevExpress dlls FluidKit PixelLab.WPF PixelLab.Common Galasoft WPF Kit FluentNHibernate NHibernate Nhibernate.ByteCode.Castle Skype4ComLib TXTEXTControl log4net LinqKit All of these DLLs are in the output folder with the application dlls created from the class assemblys in the project. So when installed via an installer on a machine the dlls will be in the same application folder as the application file itself. Many thanks

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• JS and Rails site wide announcements

  - by pcasa

  Tried doing http://davidwparker.com/2008/09/17/site-wide-announcements-in-rails-using-jquery-jgrowl/ Am really bad with JS. Think I am messing up on the last part where it says "This code goes in your application.js file (somewhere in $(function){ //here })" Am I not suppose to do a link_to_function and create a function with this code that references that link? Really lost on this one.

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• Problem in loading cities using JSON

  - by Saravanan I M

  I am using Geonames for loading the cities using JSON. Geonames data i imported into my database. I am using MS SQL 2008 Server. I display a dropdown for country select. Once the user select the country. I am loading all the cities into the autocomplete textbox. I am facing a delay in the getJSON method. Also it seems like executing asynchronous. So before getting all the data my autocompelte is getting filled. Below is my complete script. I think i have some problem in the loop. Please advice me what i am doing wrong in my code. $(document).ready(function () { $("#ShowLoad").hide(); //Hook onto the MakeID list's onchange event $("#Country").change(function () { findcities = []; $("#ShowLoad").show(); $("#HomeTown").unautocomplete(); var url = '<%= Url.Content("~/") %>' + "Location/GetCitiesCountByCountry/" + $("#Country").val(); $.getJSON(url, null, function (data) { var total = data; if (total > 0) { var pageTotal = Math.ceil(total / 1000); var isFilled = false; for (var i = 0; i < pageTotal; i++) { var skip = i == 1 ? 0 : (i * 1000) - 1000; var url = '<%= Url.Content("~/") %>' + "Location/GetCitiesByCountry/" + $("#Country").val() + "?skip=" + skip; //alert(i); $.getJSON(url, null, function (data) { $.each(data.Cities, function (index, optionData) { if ($("#Country").val() == "US") { findcities.push(optionData.asciiname + "," + optionData.admin1_code); } else { findcities.push(optionData.asciiname); } }); if (i == pageTotal) { //alert(findcities); $("#ShowLoad").hide(); $("#HomeTown").focus().autocomplete(findcities); } }); } $("#HomeTown").setOptions({ max: 100000 }); } }); }).change(); });

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• Choosing the right .NET architecture. WCF? WPF/Forms, ASP.NET (MVC)?

  - by Tommy Jakobsen

  I’m in the situation that I have to design and implement a rather big system from the bottom. I’m having some (a lot actually) questions about the architecture that I would like your comments and thoughts on. I don’t hope that I’ve written too much here, but I wanted to give you all an idea of what the system is. Quick info about the applications, read if you want: I can’t share much detail about the project, but basically it’s a system where we offer our customer a service to manage their users. We have a hotline where the users call and our hotline uses an (windows) application (intranet) to manage the user’s data, etc. The customer also has a web application where they can see reports, information about their business and users, and the ability to modify their data. Modifying data is not just user data like address and so, but also information about the products/services the user has, which can be complicated. The applications will be built on Microsoft .NET Framework 4, with a MS SQL Server 2008 database. There will be a few applications that have to access this database, such as: Intranet application (used by us and our hotline) Customer web application type 1 Customer web application type 2 Customer web application type n different applications) … Now my big problem is what .NET parts I should use for such a system. For the “backend” I’ve considered using Windows Communication Foundation: Would WCF be a good choice? The intranet application will be an application that has to edit lots of records in the database. It has to be easy to navigate using the keyboard (fast to work with). Has a feature such as “find customer, find that, lookup this, choose this and update that”. What would be the best choice to develop this application in? Would it be WPF or good old Windows Forms? I don’t need all of the fancy graphics features in WPF, like 3D, but the application has to look nice (maybe something like the new Visual Studio/Office tools). And the same question goes for the web pages. They have much the same work to do, but not as many features as the intranet application, and not the same amount of data (much less). That is my questions for now. I’m hoping to get a discussion going that will open my eyes to some of these technologies, helping me decide architecture to go with. I would like to say thanks in advance, and let you all know that any thoughts will be much appreciated.

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• WTF is wtf? (in WebKit code base)

  - by Motti

  I downloaded Chromium's code base and ran across the WTF namespace. namespace WTF { /* * C++'s idea of a reinterpret_cast lacks sufficient cojones. */ template<typename TO, typename FROM> TO bitwise_cast(FROM in) { COMPILE_ASSERT(sizeof(TO) == sizeof(FROM), WTF_wtf_reinterpret_cast_sizeof_types_is_equal); union { FROM from; TO to; } u; u.from = in; return u.to; } } // namespace WTF Does this mean what I think it means? Could be so, the bitwise_cast implementation specified here will not compile if either TO or FROM is not a POD and is not (AFAIK) more powerful than C++ built in reinterpret_cast. The only point of light I see here is the nobody seems to be using bitwise_cast in the Chromium project. I see there's some legalese so I'll put in the little letters to keep out of trouble. /* * Copyright (C) 2008 Apple Inc. All Rights Reserved. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * * THIS SOFTWARE IS PROVIDED BY APPLE INC. ``AS IS'' AND ANY * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. */

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• What am I not getting about this abstract class implementation?

  - by Schnapple

  PREFACE: I'm relatively inexperienced in C++ so this very well could be a Day 1 n00b question. I'm working on something whose long term goal is to be portable across multiple operating systems. I have the following files: Utilities.h #include <string> class Utilities { public: Utilities() { }; virtual ~Utilities() { }; virtual std::string ParseString(std::string const& RawString) = 0; }; UtilitiesWin.h (for the Windows class/implementation) #include <string> #include "Utilities.h" class UtilitiesWin : public Utilities { public: UtilitiesWin() { }; virtual ~UtilitiesWin() { }; virtual std::string ParseString(std::string const& RawString); }; UtilitiesWin.cpp #include <string> #include "UtilitiesWin.h" std::string UtilitiesWin::ParseString(std::string const& RawString) { // Magic happens here! // I'll put in a line of code to make it seem valid return ""; } So then elsewhere in my code I have this #include <string> #include "Utilities.h" void SomeProgram::SomeMethod() { Utilities *u = new Utilities(); StringData = u->ParseString(StringData); // StringData defined elsewhere } The compiler (Visual Studio 2008) is dying on the instance declaration c:\somepath\somecode.cpp(3) : error C2259: 'Utilities' : cannot instantiate abstract class due to following members: 'std::string Utilities::ParseString(const std::string &)' : is abstract c:\somepath\utilities.h(9) : see declaration of 'Utilities::ParseString' So in this case what I'm wanting to do is use the abstract class (Utilities) like an interface and have it know to go to the implemented version (UtilitiesWin). Obviously I'm doing something wrong but I'm not sure what. It occurs to me as I'm writing this that there's probably a crucial connection between the UtilitiesWin implementation of the Utilities abstract class that I've missed, but I'm not sure where. I mean, the following works #include <string> #include "UtilitiesWin.h" void SomeProgram::SomeMethod() { Utilities *u = new UtilitiesWin(); StringData = u->ParseString(StringData); // StringData defined elsewhere } but it means I'd have to conditionally go through the different versions later (i.e., UtilitiesMac(), UtilitiesLinux(), etc.) What have I missed here?

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• To set up a subversion server, do we need to install apache tomcat server too?

  - by Karthik

  http://www.codinghorror.com/blog/2008/04/setting-up-subversion-on-windows.html I am following this as a guide to install subversion. The tutorial at the time dealt with version 1.4.6 but the latest version is different. Is this tutorial valid still? also there is no mention about installing the apache server.

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• EF4 Import/Lookup thousands of records - my performance stinks!

  - by Dennis Ward

  I'm trying to setup something for a movie store website (using ASP.NET, EF4, SQL Server 2008), and in my scenario, I want to allow a "Member" store to import their catalog of movies stored in a text file containing ActorName, MovieTitle, and CatalogNumber as follows: Actor, Movie, CatalogNumber John Wayne, True Grit, 4577-12 (repeated for each record) This data will be used to lookup an actor and movie, and create a "MemberMovie" record, and my import speed is terrible if I import more than 100 or so records using these tables: Actor Table: Fields = {ID, Name, etc.} Movie Table: Fields = {ID, Title, ActorID, etc.} MemberMovie Table: Fields = {ID, CatalogNumber, MovieID, etc.} My methodology to import data into the MemberMovie table from a text file is as follows (after the file has been uploaded successfully): Create a context. For each line in the file, lookup the artist in the Actor table. For each Movie in the Artist table, lookup the matching title. If a matching Movie is found, add a new MemberMovie record to the context and call ctx.SaveChanges(). The performance of my implementation is terrible. My expectation is that this can be done with thousands of records in a few seconds (after the file has been uploaded), and I've got something that times out the browser. My question is this: What is the best approach for performing bulk lookups/inserts like this? Should I call SaveChanges only once rather than for each newly created MemberMovie? Would it be better to implement this using something like a stored procedure? A snippet of my loop is roughly this (edited for brevity): while ((fline = file.ReadLine()) != null) { string [] token = fline.Split(separator); string Actor = token[0]; string Movie = token[1]; string CatNumber = token[2]; Actor found_actor = ctx.Actors.Where(a => a.Name.Equals(actor)).FirstOrDefault(); if (found_actor == null) continue; Movie found_movie = found_actor.Movies.Where( s => s.Title.Equals(title, StringComparison.CurrentCultureIgnoreCase)).FirstOrDefault(); if (found_movie == null) continue; ctx.MemberMovies.AddObject(new MemberMovie() { MemberProfileID = profile_id, CatalogNumber = CatNumber, Movie = found_movie }); try { ctx.SaveChanges(); } catch { } } Any help is appreciated! Thanks, Dennis

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• C++ vs. C++/CLI: Const qualification of virtual function parameters

  - by James McNellis

  [All of the following was tested using Visual Studio 2008 SP1] In C++, const qualification of parameter types does not affect the type of a function (8.3.5/3: "Any cv-qualifier modifying a parameter type is deleted") So, for example, in the following class hierarchy, Derived::Foo overrides Base::Foo: struct Base { virtual void Foo(const int i) { } }; struct Derived : Base { virtual void Foo(int i) { } }; Consider a similar hierarchy in C++/CLI: ref class Base abstract { public: virtual void Foo(const int) = 0; }; ref class Derived : public Base { public: virtual void Foo(int i) override { } }; If I then create an instance of Derived: int main(array<System::String ^> ^args) { Derived^ d = gcnew Derived; } it compiles without errors or warnings. When I run it, it throws the following exception and then terminates: An unhandled exception of type 'System.TypeLoadException' occurred in ClrVirtualTest.exe Additional information: Method 'Foo' in type 'Derived'...does not have an implementation. That exception seems to indicate that the const qualification of the parameter does affect the type of the function in C++/CLI (or, at least it affects overriding in some way). However, if I comment out the line containing the definition of Derived::Foo, the compiler reports the following error (on the line in main where the instance of Derived is instantiated): error C2259: 'Derived': cannot instantiate abstract class If I add the const qualifier to the parameter of Derived::Foo or remove the const qualifier from the parameter of Base::Foo, it compiles and runs with no errors. I would think that if the const qualification of the parameter affects the type of the function, I should get this error if the const qualification of the parameter in the derived class virtual function does not match the const qualification of the parameter in the base class virtual function. If I change the type of Derived::Foo's parameter from an int to a double, I get the following warning (in addition to the aforementioned error, C2259): warning C4490: 'override': incorrect use of override specifier; 'Derived::Foo' does not match a base ref class method So, my question is, effectively, does the const qualification of function parameters affect the type of the function in C++/CLI? If so, why does this compile and why are there no errors or warnings? If not, why is an exception thrown?

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