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• How do you measure latency in low-latency environments?

  - by Ajaxx

  Here's the setup... Your system is receiving a stream of data that contains discrete messages (usually between 32-128 bytes per message). As part of your processing pipeline, each message passes through two physically separate applications which exchange the data using a low-latency approach (such as messaging over UDP) or RDMA and finally to a client via the same mechanism. Assuming you can inject yourself at any level, including wire protocol analysis, what tools and/or techniques would you use to measure the latency of your system. As part of this, I'm assuming that every message that is delivered to the system results in a corresponding (though not equivalent) message being pushed through the system and delivered to the client. The only tool that I've seen on the market like this is TS-Associates TipOff. I'm sure that with the right access you could probably measure the same information using a wire analysis tool (ala wireshark) and the right dissectors, but is this the right approach or are there any commodity solutions that I can use?

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• Django: Implementing a referral program

  - by Hellnar

  Hello, I have an ecommerce website that works in a classical way: people sign up, buy a product with their CC. It uses the default Django auth system for users and registration and session framework. Now I want to implement a referral system to my system where people can invite other people by giving their referral link (ie mysite.com/referral/123123/ ) and if a person signs up AND buys an item, the inviter gets 5$. How can this the implemented ?

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• Returning new object, overwrite the existing one in Java

  - by lupin

  Note: This is an assignment. Hi, Ok I have this method that will create a supposedly union of 2 sets. i mport java.io.*; class Set { public int numberOfElements; public String[] setElements; public int maxNumberOfElements; // constructor for our Set class public Set(int numberOfE, int setE, int maxNumberOfE) { this.numberOfElements = numberOfE; this.setElements = new String[setE]; this.maxNumberOfElements = maxNumberOfE; } // Helper method to shorten/remove element of array since we're using basic array instead of ArrayList or HashSet from collection interface :( static String[] removeAt(int k, String[] arr) { final int L = arr.length; String[] ret = new String[L - 1]; System.arraycopy(arr, 0, ret, 0, k); System.arraycopy(arr, k + 1, ret, k, L - k - 1); return ret; } int findElement(String element) { int retval = 0; for ( int i = 0; i < setElements.length; i++) { if ( setElements[i] != null && setElements[i].equals(element) ) { return retval = i; } retval = -1; } return retval; } void add(String newValue) { int elem = findElement(newValue); if( numberOfElements < maxNumberOfElements && elem == -1 ) { setElements[numberOfElements] = newValue; numberOfElements++; } } int getLength() { if ( setElements != null ) { return setElements.length; } else { return 0; } } String[] emptySet() { setElements = new String[0]; return setElements; } Boolean isFull() { Boolean True = new Boolean(true); Boolean False = new Boolean(false); if ( setElements.length == maxNumberOfElements ){ return True; } else { return False; } } Boolean isEmpty() { Boolean True = new Boolean(true); Boolean False = new Boolean(false); if ( setElements.length == 0 ) { return True; } else { return False; } } void remove(String newValue) { for ( int i = 0; i < setElements.length; i++) { if ( setElements[i] != null && setElements[i].equals(newValue) ) { setElements = removeAt(i,setElements); } } } int isAMember(String element) { int retval = -1; for ( int i = 0; i < setElements.length; i++ ) { if (setElements[i] != null && setElements[i].equals(element)) { return retval = i; } } return retval; } void printSet() { for ( int i = 0; i < setElements.length; i++) { if (setElements[i] != null) { System.out.println("Member elements on index: "+ i +" " + setElements[i]); } } } String[] getMember() { String[] tempArray = new String[setElements.length]; for ( int i = 0; i < setElements.length; i++) { if(setElements[i] != null) { tempArray[i] = setElements[i]; } } return tempArray; } Set union(Set x, Set y) { String[] newXtemparray = new String[x.getLength()]; String[] newYtemparray = new String[y.getLength()]; int len = newYtemparray.length + newXtemparray.length; Set temp = new Set(0,len,len); newXtemparray = x.getMember(); newYtemparray = x.getMember(); for(int i = 0; i < newYtemparray.length; i++) { temp.add(newYtemparray[i]); } for(int j = 0; j < newXtemparray.length; j++) { temp.add(newXtemparray[j]); } return temp; } Set difference(Set x, Set y) { String[] newXtemparray = new String[x.getLength()]; String[] newYtemparray = new String[y.getLength()]; int len = newYtemparray.length + newXtemparray.length; Set temp = new Set(0,len,len); newXtemparray = x.getMember(); newYtemparray = x.getMember(); for(int i = 0; i < newXtemparray.length; i++) { temp.add(newYtemparray[i]); } for(int j = 0; j < newYtemparray.length; j++) { int retval = temp.findElement(newYtemparray[j]); if( retval != -1 ) { temp.remove(newYtemparray[j]); } } return temp; } } // This is the SetDemo class that will make use of our Set class class SetDemo { public static void main(String[] args) { //get input from keyboard BufferedReader keyboard; InputStreamReader reader; String temp = ""; reader = new InputStreamReader(System.in); keyboard = new BufferedReader(reader); try { System.out.println("Enter string element to be added" ); temp = keyboard.readLine( ); System.out.println("You entered " + temp ); } catch (IOException IOerr) { System.out.println("There was an error during input"); } /* ************************************************************************** * Test cases for our new created Set class. * ************************************************************************** */ Set setA = new Set(0,10,10); setA.add(temp); setA.add("b"); setA.add("b"); setA.add("hello"); setA.add("world"); setA.add("six"); setA.add("seven"); setA.add("b"); int size = setA.getLength(); System.out.println("Set size is: " + size ); Boolean isempty = setA.isEmpty(); System.out.println("Set is empty? " + isempty ); int ismember = setA.isAMember("sixb"); System.out.println("Element sixb is member of setA? " + ismember ); Boolean output = setA.isFull(); System.out.println("Set is full? " + output ); //setA.printSet(); int index = setA.findElement("world"); System.out.println("Element b located on index: " + index ); setA.remove("b"); //setA.emptySet(); int resize = setA.getLength(); System.out.println("Set size is: " + resize ); //setA.printSet(); Set setB = new Set(0,10,10); setB.add("b"); setB.add("z"); setB.add("x"); setB.add("y"); Set setC = setA.union(setB,setA); System.out.println("Elements of setA"); setA.printSet(); System.out.println("Union of setA and setB"); setC.printSet(); } } The union method works a sense that somehow I can call another method on it but it doesn't do the job, i supposedly would create and union of all elements of setA and setB but it only return element of setB. Sample output follows: java SetDemo Enter string element to be added hello You entered hello Set size is: 10 Set is empty? false Element sixb is member of setA? -1 Set is full? true Element b located on index: 2 Set size is: 9 Elements of setA Member elements on index: 0 hello Member elements on index: 1 world Member elements on index: 2 six Member elements on index: 3 seven Union of setA and setB Member elements on index: 0 b Member elements on index: 1 z Member elements on index: 2 x Member elements on index: 3 y thanks, lupin

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• Code Access Security and Sharepoint WebParts

  - by Gordon Carpenter-Thompson

  I've got a vague handle on how Code Access Security works in Sharepoint. I have developed a custom webpart and setup a CAS policy in my Manifest <CodeAccessSecurity> <PolicyItem> <PermissionSet class="NamedPermissionSet" version="1" Description="Permission set for Okana"> <IPermission class="Microsoft.SharePoint.Security.SharePointPermission, Microsoft.SharePoint.Security, Version=12.0.0.0, Culture=neutral, PublicKeyToken=71e9bce111e9429c" version="1" ObjectModel="True" Impersonate="True" /> <IPermission class="SecurityPermission" version="1" Flags="Assertion, Execution, ControlThread, ControlPrincipal, RemotingConfiguration" /> <IPermission class="AspNetHostingPermission" version="1" Level="Medium" /> <IPermission class="DnsPermission" version="1" Unrestricted="true" /> <IPermission class="EventLogPermission" version="1" Unrestricted="true"> <Machine name="localhost" access="Administer" /> </IPermission> <IPermission class="EnvironmentPermission" version="1" Unrestricted="true" /> <IPermission class="System.Configuration.ConfigurationPermission, System.Configuration, Version=2.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a" version="1" Unrestricted="true"/> <IPermission class="System.Net.WebPermission, System, Version=1.0.5000.0, Culture=neutral, PublicKeyToken=b77a5c561934e089" version="1" Unrestricted="true" /> <IPermission class="System.Net.WebPermission, System, Version=2.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089" Unrestricted="true" /> <IPermission class="System.Security.Permissions.FileIOPermission, mscorlib, Version=2.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089" version="1" Unrestricted="true" PathDiscovery="*AllFiles*" /> <IPermission class="IsolatedStorageFilePermission" version="1" Allowed="AssemblyIsolationByUser" UserQuota="9223372036854775807" /> <IPermission class="PrintingPermission" version="1" Level="DefaultPrinting" /> <IPermission class="PerformanceCounterPermission" version="1"> <Machine name="localhost"> <Category name="Enterprise Library Caching Counters" access="Write"/> <Category name="Enterprise Library Cryptography Counters" access="Write"/> <Category name="Enterprise Library Data Counters" access="Write"/> <Category name="Enterprise Library Exception Handling Counters" access="Write"/> <Category name="Enterprise Library Logging Counters" access="Write"/> <Category name="Enterprise Library Security Counters" access="Write"/> </Machine> </IPermission> <IPermission class="ReflectionPermission" version="1" Unrestricted="true"/> <IPermission class="SecurityPermission" version="1" Flags="SerializationFormatter, UnmanagedCode, Infrastructure, Assertion, Execution, ControlThread, ControlPrincipal, RemotingConfiguration, ControlAppDomain,ControlDomainPolicy" /> <IPermission class="SharePointPermission" version="1" ObjectModel="True" /> <IPermission class="SmtpPermission" version="1" Access="Connect" /> <IPermission class="SqlClientPermission" version="1" Unrestricted="true"/> <IPermission class="WebPartPermission" version="1" Connections="True" /> <IPermission class="WebPermission" version="1"> <ConnectAccess> <URI uri="$OriginHost$"/> </ConnectAccess> </IPermission> </PermissionSet> <Assemblies> .... </Assemblies> This is correctly converted into a wss_custom_wss_minimaltrust.config when it is deployed onto the Sharepoint server and mostly works. To get the WebPart working fully, however I find that I need to modify the wss_custom_wss_minimaltrust.config by hand after deployment and set Unrestricted="true" on the permissions set <PermissionSet class="NamedPermissionSet" version="1" Description="Permission set for MyApp" Name="mywebparts.wsp-86d8cae1-7db2-4057-8c17-dc551adb17a2-1"> to <PermissionSet class="NamedPermissionSet" version="1" Description="Permission set for MyApp" Name="mywebparts.wsp-86d8cae1-7db2-4057-8c17-dc551adb17a2-1" Unrestricted="true"> It's all because I'm loading a User Control from the webpart. I don't believe there is a way to enable that using CAS but am willing to be proven wrong. Is there a way to set something in the manifest so I don't need to make this fix by hand? Thanks

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• How to implement email correlation with subject and body modification?

  - by Neuquino

  I have a system that sends mail. I have a system that receives mail. I need to identify that a received mail correlates with the one the other system sent. The particular thing here is that either the subject or the body can be modified. I thought on putting some hash in the header of the sent email, but I don't know where this could be added Don't you have any clue?

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• nested linq-to-sql queries

  - by ile

  var result = ( from contact in db.Contacts join user in db.Users on contact.CreatedByUserID equals user.UserID orderby contact.ContactID descending select new ContactListView { ContactID = contact.ContactID, FirstName = contact.FirstName, LastName = contact.LastName, Company = (from field in contact.XmlFields.Descendants("Company") select field.Value).SingleOrDefault().ToString() }).Take(10); Here I described how my database tables look like. So, contacts table has one field that is xml type. In that field is stored Company filename and I need to read it. I tried it using this way: Company = (from field in contact.XmlFields.Descendants("Company") select field.Value).SingleOrDefault().ToString() }).Take(10); but I get following error: Member access 'System.String Value' of 'System.Xml.Linq.XElement' not legal on type 'System.Collections.Generic.IEnumerable`1[System.Xml.Linq.XElement]. Any solution for this? Thanks in advance, Ile

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• XML child node attribute value

  - by c0mrade

  I'm trying to read xml file, ex : <entry> <title>FEED TITLE</title> <id>5467sdad98787ad3149878sasda</id> <tempi type="application/xml"> <conento xmlns="http://mydomainname.com/xsd/radiofeed.xsd" madeIn="USA" /> </tempi> </entry> Here is the code I have so far : public void parseXML(String xml) { try { InputStream inputStream = new ByteArrayInputStream(xml.getBytes()); DocumentBuilderFactory dbf = DocumentBuilderFactory.newInstance(); DocumentBuilder db = dbf.newDocumentBuilder(); Document doc = db.parse(inputStream); doc.getDocumentElement().normalize(); System.out.println("Root element " + doc.getDocumentElement().getNodeName()); NodeList nodeLst = doc.getElementsByTagName("entry"); System.out.println("Information of all entries"); for (int s = 0; s < nodeLst.getLength(); s++) { Node fstNode = nodeLst.item(s); if (fstNode.getNodeType() == Node.ELEMENT_NODE) { Element fstElmnt = (Element) fstNode; NodeList title = fstElmnt.getElementsByTagName("title").item(0).getChildNodes(); System.out.println("Title : " + ((Node) title.item(0)).getNodeValue()); NodeList id = fstElmnt.getElementsByTagName("id").item(0).getChildNodes(); System.out.println("Id: " + ((Node) update.item(0)).getNodeValue()); NodeList contento= fstElmnt.getElementsByTagName("tempi").item(0).getChildNodes(); System.out.println("Contento : " + ((Node) content.item(0)).getFirstChild().getAttributes()); // with this line above I'm having problems, I get null pointer exception } } } catch (Exception e) { e.printStackTrace(); } } How can I read/get, contento tag attributes? I'm using org.w3c.dom lib.

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• How do I read text from a serial port?

  - by user2164

  I am trying to read data off of a Windows serial port through Java. I have the javax.comm libraries and am able to get some data but not correct data. When I read the port into a byte array and convert it to text I get a series of characters but no real text string. I have tried to specify the byte array as being both "UTF-8" and "US-ASCII". Does anyone know how to get real text out of this? Here is my code: while (inputStream.available() > 0) { int numBytes = inputStream.read(readBuffer); System.out.println("Reading from " + portId.getName() + ": "); System.out.println("Read " + numBytes + " bytes"); } System.out.println(new String(readBuffer)); System.out.println(new String(readBuffer, "UTF-8")); System.out.println(new String(readBuffer, "US-ASCII")); the output of the first three lines will not let me copy and paste (I assume because they are not normal characters). Here is the output of the Hex: 78786000e67e9e60061e8606781e66e0869e98e086f89898861878809e1e9880 I am reading from a Hollux GPS device which does output in string format. I know this for sure because I did it through C#. The settings that I am using for communication which I know are right from the work in the C# app are: Baud Rate: 9600 Databits: 8 Stop bit: 1 parity: none

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• How to make freelance clients understand the costs of developing and maintaining mature products?

  - by John

  I have a freelance web application project where the client requests new features every two weeks or so. I am unable to anticipate the requirements of upcoming features. So when the client requests a new feature, one of several things may happen: I implement the feature with ease because it is compatible with the existing platform I implement the feature with difficulty because I have to rewrite a significant portion of the platform's foundation Client withdraws request because it costs too much to implement against existing platform At the beginning of the project, for about six months, all feature requests fell under category 1) because the system was small and agile. But for the past six months, most feature implementation fell under category 2). The system is mature, forcing me to refactor and test everytime I want to add new modules. Additionally, I find myself breaking things that use to work, and fixing it (I don't get paid for this). The client is starting to express frustration at the time and cost for me to implement new features. To them, many of the feature requests are of the same scale as the features they requested six months ago. For example, a client would ask, "If it took you 1 week to build a ticketing system last year, why does it take you 1 month to build an event registration system today? An event registration system is much simpler than a ticketing system. It should only take you 1 week!" Because of this scenario, I fear feature requests will soon land in category 3). In fact, I'm already eating a lot of the cost myself because I volunteer many hours to support the project. The client is often shocked when I tell him honestly the time it takes to do something. The client always compares my estimates against the early months of a project. I don't think they're prepared for what it really costs to develop, maintain and support a mature web application. When working on a salary for a full time company, managers were more receptive of my estimates and even encouraged me to pad my numbers to prepare for the unexpected. Is there a way to condition my clients to think the same way? Can anyone offer advice on how I can continue to work on this web project without eating too much of the cost myself? Additional info - I've only been freelancing full time for 1 year. I don't yet have the high end clients, but I'm slowly getting there. I'm getting better quality clients as time goes by.

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• Monotouch UITableView image "flashing" while background requests are fetched

  - by Themos Piperakis

  I am in need of some help from you guys. I have a Monotouch UITableView which contains some web images. I have implemented a Task to fetch them asynchronously so the UI is responsive, an even added some animations to fade them in when they are fetched from the web. My problems start when the user scrolls down very fast down the UITableView, so since the cells are resusable, several background tasks are queued for images. When he is at the bottom of the list, he might see the thumbnail displaying an image for another cell, then another, then another, then another, as the tasks are completed and each image replaces the other one. I am in need of some sort of checking whether the currently displayed cell corresponds to the correct image url, but not sure how to do that. Here is the code for my TableSource class. using System; using MonoTouch.UIKit; using MonoTouch.Foundation; using System.Collections.Generic; using System.Threading; using System.Threading.Tasks; using System.Diagnostics; { public class ListDelegate:UITableViewDelegate { private UINavigationController nav; public override float GetHeightForRow (UITableView tableView, NSIndexPath indexPath) { return 128; } public override void RowSelected (UITableView tableView, NSIndexPath indexPath) { DealViewController c = new DealViewController(((ListDataSource)tableView.DataSource).deals[indexPath.Row].Id,nav); nav.PushViewController(c,true); tableView.DeselectRow(indexPath,true); } public ListDelegate(UINavigationController nav) { this.nav = nav; } } public class ListDataSource:UITableViewDataSource { bool toggle=true; Dictionary<string,UIImage> images = new Dictionary<string, UIImage>(); public List<MyDeal> deals = new List<MyDeal>(); Dictionary<int,ListCellViewController> controllers = new Dictionary<int, ListCellViewController>(); public ListDataSource(List<MyDeal> deals) { this.deals = deals; } public override int RowsInSection (UITableView tableview, int section) { return deals.Count; } public override UITableViewCell GetCell (UITableView tableView, MonoTouch.Foundation.NSIndexPath indexPath) { UITableViewCell cell = tableView.DequeueReusableCell("cell"); ListCellViewController cellController = null; if (cell == null || !controllers.ContainsKey(cell.Tag)) { cellController = new ListCellViewController(); NSBundle.MainBundle.LoadNib("ListCellViewController", cellController, null); cell = cellController.Cell; cell.Tag = Environment.TickCount; controllers.Add(cell.Tag, cellController); } else { cellController = controllers[cell.Tag]; } if (toggle) { cell.BackgroundView = new UIImageView(UIImage.FromFile("images/bg1.jpg")); } else { cell.BackgroundView = new UIImageView(UIImage.FromFile("images/bg2.jpg")); } toggle = !toggle; MyDeal d = deals[indexPath.Row]; cellController.SetValues(d.Title,d.Price,d.Value,d.DiscountPercent); GetImage(cellController.Thumbnail,d.Thumbnail); return cell; } private void GetImage(UIImageView img, string url) { img.Alpha = 0; if (url != string.Empty) { if (images.ContainsKey(url)) { img.Image = images[url]; img.Alpha = 1; } else { var context = TaskScheduler.FromCurrentSynchronizationContext (); Task.Factory.StartNew (() => { NSData imageData = NSData.FromUrl(new NSUrl(url)); var uimg = UIImage.LoadFromData(imageData); images.Add(url,uimg); return uimg; }).ContinueWith (t => { InvokeOnMainThread(()=>{ img.Image = t.Result; RefreshImage(img); }); }, context); } } } private void RefreshImage(UIImageView img) { UIView.BeginAnimations("imageThumbnailTransitionIn"); UIView.SetAnimationDuration(0.5f); img.Alpha = 1.0f; UIView.CommitAnimations(); } } } Here is the ListCellViewController, that contains a custom cell using System; using System.Collections.Generic; using System.Linq; using MonoTouch.Foundation; using MonoTouch.UIKit; { public partial class ListCellViewController : UIViewController { #region Constructors // The IntPtr and initWithCoder constructors are required for items that need // to be able to be created from a xib rather than from managed code public ListCellViewController (IntPtr handle) : base(handle) { Initialize (); } [Export("initWithCoder:")] public ListCellViewController (NSCoder coder) : base(coder) { Initialize (); } public ListCellViewController () : base("ListCellViewController", null) { Initialize (); } void Initialize () { } public UIImageView Thumbnail { get{return thumbnailView;} } public UITableViewCell Cell { get {return cell;} } public void SetValues(string title,decimal price,decimal valuex,decimal discount,int purchases) { } #endregion } } All help is greatly appreciated

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• stuck with enable session state

  - by Shrewd Demon

  hi i have an application wherein i am accessing the Session object in the CommonCode.cs file that resides in the App_Code folder. But when the session object is accessed the application throws me an error: Session state can only be used when enableSessionState is set to true, either in a configuration file or in the Page directive. Please also make sure that System.Web.SessionStateModule or a custom session state module is included in the \\ section in the application configuration. Now i have already enabled the session state property in the web.config file, here is my code from the web.config file: <pages enableSessionState="true" autoEventWireup="true"> <controls> <add tagPrefix="asp" namespace="System.Web.UI" assembly="System.Web.Extensions, Version=3.5.0.0, Culture=neutral, PublicKeyToken=31BF3856AD364E35"/> <add tagPrefix="asp" namespace="System.Web.UI.WebControls" assembly="System.Web.Extensions, Version=3.5.0.0, Culture=neutral, PublicKeyToken=31BF3856AD364E35"/> </controls> </pages> I dont understand why am i still getting that error !! please help ! thanks a lot.

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• Single console in eclipse for both Server and Client

  - by rits

  I am building a client server application using Java Sockets (in Windows XP). For that I need different consoles for both Client and Server(for Input and Output operations). But in eclipse both share a single console. Is there any plugin or some sort of cheat through which I can do this. After googling I got this, http://dev.eclipse.org/newslists/news.eclipse.newcomer/msg17138.html But, this seems to be only for write operations, not read operations. Also, I tried the following to launch application manually, but even this is not working........ package mypack; import java.io.BufferedOutputStream; import java.io.File; import java.io.FileOutputStream; import java.io.IOException; import java.io.OutputStream; import java.io.PrintStream; public class MySystem { public static void changeStream(String mainFile) throws IOException{ File temp = new File(".") ; String parentPath = temp.getCanonicalPath() ; System.out.println(parentPath); //creation of batch file starts here try{ File f = new File(parentPath + "\\a.bat") ; System.out.println("Created : " + f.createNewFile()); //f.deleteOnExit() ; FileOutputStream fos = new FileOutputStream(f) ; String str = "java " + mainFile ; String batchCommand="@echo off\n"+str+"\npause\nexit"; char arr[] = batchCommand.toCharArray() ; System.out.println(str) ; for(int i = 0 ; i < arr.length ; i++){ fos.write(arr[i]) ; } fos.close() ; } catch(Exception e){ } //creation of batch file ends here //execution of batch file starts here try{ Runtime r = Runtime.getRuntime() ; System.out.println(parentPath + "\\a.bat") ; Process p = r.exec(new String[]{"cmd","/k","start a.bat"},null,new File(parentPath)) ; OutputStream os = (OutputStream)p.getOutputStream() ; System.setOut( new PrintStream(os) ) ; System.out.println("Hello"); } catch(Exception e){ e.printStackTrace(); } //execution of batch file ends here } public static void main(String[] args) throws IOException { MySystem.changeStream("MySystem") ; } }

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• Drag and Drop to explorer causing invalid FORMATETC (DV_E_FORMATETC) error

  - by JustABill

  I'm trying to use this excellent example to implement dropping virtual files into Windows Explorer. However, I'm stymied by this error. Towards the bottom, inside void System.Runtime.InteropServices.ComTypes.IDataObject.GetData(ref System.Runtime.InteropServices.ComTypes.FORMATETC formatetc, out System.Runtime.InteropServices.ComTypes.STGMEDIUM medium) on the first call to ((System.Runtime.InteropServices.ComTypes.IDataObject)this).GetDataHere(ref formatetc, ref medium); I'm getting back a DV_E_FORMATETC error. As far as I can tell, all the elements of the FORMATETC struct that are being passed in are valid: cfFormat is "Shell IDList Array" (-16141), ptd is 0, dwAspect is DVASPECT_CONTENT, lindex is -1, and tymed is TYMED_HGLOBAL. I'm kind of confused how there'd be a problem anyway, since this was generated by explorer. I know very little about COM interaction, so any help would be greatly appreciated.

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• How to check which point is cause of problem with MQ?

  - by Fuangwith S.

  I use MQ for send/receive message between my system and other system. Sometime I found that no response message in response queue, yet other system have already put response message into response queue (check from log). So, how to check which point is cause of problem, how to prove message is not arrive to my response queue. In addition, when message arrive my queue it will be written to log file.

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• Java Reflection, java.lang.IllegalAccessException Error

  - by rubby

  Hi all, My goal is : Third class will read the name of the class as String from console.Upon reading the name of the class, it will automatically and dynamically (!) generate that class and call its writeout method. If that class is not read from input, it will not be initialized. And I am taking java.lang.IllegalAccessException: Class deneme.class3 can not access a member of class java.lang.Object with modifiers "protected" error. And i don't know how i can fix it.. Can anyone help me? import java.io.*; import java.lang.reflect.*; class class3 { public void run() { try { BufferedReader reader= new BufferedReader(new InputStreamReader(System.in)); String line=reader.readLine(); Class c1 = Class.forName("java.lang.String"); Object obj = new Object(); Class c2 = obj.getClass(); Method writeout = null; for( Method mth : c2.getDeclaredMethods() ) { writeout = mth; break; } Object o = c2.newInstance(); writeout.invoke( o ); } catch(Exception ee) { System.out.println("ERROR! "+ee); } } public void writeout3() { System.out.println("class3"); } } class class4 { public void writeout4() { System.out.println("class4"); } } class ornek { public static void main(String[] args) { System.out.println("Please Enter Name of Class : "); class3 example = new class3(); example.run(); } }

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• Java the little console game won't repeat?

  - by Jony Kale

  Okay, what I have so far is: You enter the game, and write "spin" to the console. Program will enter the while loop. In the while loop, if entered int is -1, return to the back (Set console input back to "", and let the user select what game he would like to play). Problem: Instead of going back, and selecting "spin" again, the program exits? Why is it happening? How can I fix this? private static Scanner console = new Scanner(System.in); private static Spin spin = new Spin(); private static String inputS = ""; private static int inputI = 0; private static String[] gamesArray = new String[] {"spin", "tof"}; private static boolean spinWheel = false; private static boolean tof = false; public static void main (String[] args) { if (inputS.equals("")) { System.out.println("Welcome to the system!"); System.out.print("Please select a game: "); inputS = console.nextLine(); } while (inputS.equals("spin")) { System.out.println("Welcome to the spin game! Please write 1 to spin. and -1 to exit back"); inputI = console.nextInt(); switch (inputI) { case 1: break; case -1: inputI = 0; inputS = ""; break; } } }

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• Why Kiln is based on Mercurial, and not other (D)VCS

  - by Jakub Narebski

  What were the reason for chosing Mercurial as a basis of FogCreek Kiln, a source control management system with tightly integrated code review, and FogBugz integration? Why Mercurial, and not other (distributed) version control system, like Bazaar, Git or Monotone, or creating own version control system like Fossil (distributed software configuration management, including bug tracking and wiki) did? What were features that make FogCreek choose Mercurial as Kiln engine?

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• string extension method - Not available through WebMethod

  - by Peter Bridger

  I've written a simple extension method for a web project, it sits in a class file called StringExtensions.cs which contains the following code: using System; using System.Collections.Generic; using System.Linq; using System.Web; /// <summary> /// Useful extensions for string /// </summary> static class StringExtensions { /// <summary> /// Is string empty /// </summary> /// <param name="value"></param> /// <returns></returns> public static bool IsEmpty(this string value) { return value.Trim().Length == 0; } } I can access this extension method from all the classes I have within the App_Code directory. However I have a web page called JSON.aspx that contains a series of [WebMethods] - within these I cannot see the extension method - I must be missing something very obvious!

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• Cast errors with IXmlSerializable

  - by Nathan

  I am trying to use the IXmlSerializable interface to deserialize an Object (I am using it because I need specific control over what gets deserialized and what does not. See my previous question for more information). However, I'm stumped as to the error message I get. Below is the error message I get (I have changed some names for clarity): An unhandled exception of type 'System.InvalidCastException' occurred in App.exe Additional information: Unable to cast object of type 'System.Xml.XmlNode[]' to type 'MyObject'. MyObject has all the correct methods defined for the interface, and regardless of what I put in the method body for ReadXml() I still get this error. It doesn't matter if it has my implementation code or if it's just blank. I did some googling and found an error that looks similar to this involving polymorphic objects that implement IXmlSerializable. However, my class does not inherit from any others (besides Object). I suspected this may be an issue because I never reference XmlNode any other time in my code. Microsoft describes a solution to the polymorphism error: https://connect.microsoft.com/VisualStudio/feedback/details/422577/incorrect-deserialization-of-polymorphic-type-that-implements-ixmlserializable?wa=wsignin1.0#details The code the error occurs at is as follows. The object to be read back in is an ArrayList of "MyObjects" IO::FileStream ^fs = gcnew IO::FileStream(filename, IO::FileMode::Open); array<System::Type^>^ extraTypes = gcnew array<System::Type^>(1); extraTypes[0] = MyObject::typeid; XmlSerializer ^xmlser = gcnew XmlSerializer(ArrayList::typeid, extraTypes); System::Object ^obj; obj = xmlser->Deserialize(fs); fs->Close(); ArrayList ^al = safe_cast<ArrayList^>(obj); MyObject ^objs; for each(objs in al) //Error occurs here { //do some processing } Thanks for reading and for any help.

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• How do i get a more recent version of Java on my Mac than is showing up in software update?

  - by Cd Lolly

  I need at least Java 1.6 to run a program that someone else in my lab wrote On the Java website it tells me to update Java via apple's software update function, i've run this a few times but it only got up to Java 1.5.0_24 and it now says no more updates are available for my computer Is there another way to update Java on a Mac? Is my operating system maybe to old for Java 1.6? i'm not sure what i'm running exactly, and i can't find a list of what mac operating systems run what versions of Java because the java site just suggests using Mac's software update.

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• Convert UCS-2 characters to UTF-8 Using C#

  - by quanticle

  I'm pulling some internationalized text from a MS SQL Server 2005 database. As per the defaults for that DB, the characters are stored as UCS-2. However, I need to output the data in UTF-8 format, as I'm sending it out over the web. Currently, I have the following code to convert: SqlString dbString = resultReader.GetSqlString(0); byte[] dbBytes = dbString.GetUnicodeBytes(); byte[] utf8Bytes = System.Text.Encoding.Convert(System.Text.Encoding.Unicode, System.Text.Encoding.UTF8, dbBytes); System.Text.UTF8Encoding encoder = new System.Text.UTF8Encoding(); string outputString = encoder.GetString(utf8Bytes); However, when I examine the output in the browser, it appears to be garbage, no matter what I set the encoding to. What am I missing? EDIT: In response to the answers below, the reason I thought I had to perform a conversion is because I can output literal multibyte strings just fine. For example: OutputControl.Text = "????????????????????????????????????????????????????????????????"; works. Here, OutputControl is an ASP.Net Literal. However, OutputControl.Text = outputString; //Output from above snippet results in mangled output as described above. My hypothesis was that the database's output was somehow getting mangled by ASP.Net. If that's not the case, then what are some other possibilities?

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• help on ejb stateless datagram and message driven beans

  - by Kemmal

  i have a client thats sending a message to the ejbserver using UDP, i want the server(stateless bean) to echo back this message to the client but i cant seem to do this. or can i implement the same logic by using JMS? please help and enlighten. this is just a test, in the end i want a midp to be sending the message to the ejb using datagrams. here is my code. @Stateless public class SessionFacadeBean implements SessionFacadeRemote { public SessionFacadeBean() { } public static void main(String[] args) { DatagramSocket aSocket = null; byte[] buffer = null; try { while(true) { DatagramPacket request = new DatagramPacket(buffer, buffer.length); aSocket.receive(request); DatagramPacket reply = new DatagramPacket(request.getData(), request.getLength(), request.getAddress(), request.getPort()); aSocket.send(reply); } } catch (SocketException e) { System.out.println("Socket: " + e.getMessage()); } catch (IOException e) { System.out.println("IO: " + e.getMessage()); } finally { if(aSocket != null) aSocket.close(); } } } and the client: public static void main(String[] args) { DatagramSocket aSocket = null; try { aSocket = new DatagramSocket(); byte [] m = "Test message!".getBytes(); InetAddress aHost = InetAddress.getByName("localhost"); int serverPort = 6789; DatagramPacket request = new DatagramPacket(m, m.length, aHost, serverPort); aSocket.send(request); byte[] buffer = new byte[1000]; DatagramPacket reply = new DatagramPacket(buffer, buffer.length); aSocket.receive(reply); System.out.println("Reply: " + new String(reply.getData())); } catch (SocketException e) { System.out.println("Socket: " + e.getMessage()); } catch (IOException e) { System.out.println("IO: " + e.getMessage()); } finally { if(aSocket != null) aSocket.close(); } } please help.

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• Server restart commando?

  - by badadmin

  How can i restart the Server automaticcaly on this Operating System( http://bit.ly/dq1TQP ) Thanks for your answers!

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• How to fix Windows 2008 R2 BOOTMGR is missing

  - by RichardTheKiwi

  BOOTMGR IS MISSING PRESS CTRL+ALT+DEL TO RESTART Note: This is a VM on VMWare ESX server, but that should not matter I put in the 2008 R2 x64 install dvd and can get to recovery, but it lists no Operating Systems. Clicking on Next brings me to +=========================== System Recovery Options +=========================== Choose a recovery tool Operating system: Unknown or (Unknown) Local Disk ..... Command Prompt I start the command prompt, go to C:\ and perform a dir /a Apart from files I put there myself, these are showing $Recycle.Bin Documents and Settings [C:\Users] Program Files Program Files (x86) ProgramData Recovery System Volume Information Temp Users Windows Where to go next? Is it like the NTLDR problem with Windows 2003 where I can just drop a file in there and it will be hunky dory again?

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• Web Part to Update a List Data in SharePoint

  - by DanSogaard

  I'm trying to write a web part that access lists and add items in a specific list. The user modifies the web part and type in List Name, the web part has 3 TextBoxs and a Button. The user should enter data and press the save button, that should update the list and add these data in a new record. I'm using the following code to build my web part, but the save button doesn't update the list. I don't know what's wrong it just reload the page and add nothing. Edit: BTW the list am trying to update has three columns, First Name, Last Name, and Email, respectively. using System; using System.Web; using System.Web.UI.WebControls; using System.Web.UI.WebControls.WebParts; using System.Collections.Generic; using System.Text; using Microsoft.SharePoint; using Microsoft.SharePoint.Utilities; using Microsoft.SharePoint.WebControls; using Microsoft.SharePoint.WebPartPages; using Microsoft.SharePoint.Security; namespace TimeSheetEntry { public class TimesheetEntry : System.Web.UI.WebControls.WebParts.WebPart { public TimesheetEntry() { } protected TextBox txtFirstName; protected TextBox txtLastName; protected TextBox txtEmail; protected Button btnSave; protected string listName = string.Empty; [WebBrowsable(true), WebDisplayName("List Name"), WebDescription("Enter List Name"), Personalizable(PersonalizationScope.User)] public string LN { get { return this.listName; } set { this.listName = value; } } protected override void CreateChildControls() { //initialize textboxes txtFirstName = new TextBox(); txtLastName = new TextBox(); txtEmail = new TextBox(); //initialize button btnSave = new Button(); btnSave.Text = "Save"; btnSave.Click += new EventHandler(btnSave_Click); } protected override void Render(System.Web.UI.HtmlTextWriter writer) { writer.Write("<table width=100%>"); writer.Write("<tr>"); writer.Write("<td colspan=2>"); writer.Write("</td>"); writer.Write("</tr>"); writer.Write("<tr>"); writer.Write("<td>First:<span class=’ms-formvalidation’>*</span></td>"); writer.Write("<td>"); txtFirstName.RenderControl(writer); writer.Write("</td>"); writer.Write("</tr>"); writer.Write("<tr>"); writer.Write("<td>Last Name:<span class=’ms-formvalidation’>*</span></td>"); writer.Write("<td>"); txtLastName.RenderControl(writer); writer.Write("</td>"); writer.Write("</tr>"); writer.Write("<tr>"); writer.Write("<td>Email:<span class=’ms-formvalidation’>*</span></td>"); writer.Write("<td>"); txtEmail.RenderControl(writer); writer.Write("</td>"); writer.Write("</tr>"); writer.Write("<tr>"); writer.Write("<td>"); writer.Write("</td>"); writer.Write("<td>"); btnSave.RenderControl(writer); writer.Write("</td>"); writer.Write("</tr>"); writer.Write("</table>"); } public void btnSave_Click(object sender, EventArgs e) { SPWeb web = SPContext.Current.Web; SPList timesheetList = web.Lists[this.listName]; SPListItem newTimesheetEntry = timesheetList.Items.Add(); newTimesheetEntry["First Name"] = txtFirstName.Text; newTimesheetEntry["Last Name"] = txtLastName.Text; newTimesheetEntry["Email"] = txtEmail.Text; newTimesheetEntry.Update(); timesheetList.Update(); } } }

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