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  • Creating circular generic references

    - by M. Jessup
    I am writing an application to do some distributed calculations in a peer to peer network. In defining the network I have two class the P2PNetwork and P2PClient. I want these to be generic and so have the definitions of: P2PNetwork<T extends P2PClient<? extends P2PNetwork<T>>> P2PClient<T extends P2PNetwork<? extends T>> with P2PClient defining a method of setNetwork(T network). What I am hoping to describe with this code is: A P2PNetwork is constituted of clients of a certain type A P2PClient may only belong to a network whose clients consist of the same type as this client (the circular-reference) This seems correct to me but if I try to create a non-generic version such as MyP2PClient<MyP2PNetwork<? extends MyP2PClient>> myClient; and other variants I receive numerous errors from the compiler. So my questions are as follows: Is a generic circular reference even possible (I have never seen anything explicitly forbidding it)? Is the above generic definition a correct definition of such a circular relationship? If it is valid, is it the "correct" way to describe such a relationship (i.e. is there another valid definition, which is stylistically preferred)? How would I properly define a non-generic instance of a Client and Server given the proper generic definition?

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  • PHP Object References in Frameworks

    - by bigstylee
    Before I dive into the disscusion part a quick question; Is there a method to determine if a variable is a reference to another variable/object? For example $foo = 'Hello World'; $bar = &$foo; echo (is_reference($bar) ? 'Is reference' : 'Is orginal'; I have been using PHP5 for a few years now (personal use only) and I would say I am moderately reversed on the topic of Object Orientated implementation. However the concept of Model View Controller Framework is fairly new to me. I have looked a number of tutorials and looked at some of the open source frameworks (mainly CodeIgnitor) to get a better understanding how everything fits together. I am starting to appreciate the real benefits of using this type of structure. I am used to implementing object referencing in the following technique. class Foo{ public $var = 'Hello World!'; } class Bar{ public function __construct(){ global $Foo; echo $Foo->var; } } $Foo = new Foo; $Bar = new Bar; I was surprised to see that CodeIgnitor and Yii pass referencs of objects and can be accessed via the following method: $this->load->view('argument') The immediate advantage I can see is a lot less code and more user friendly. But I do wonder if it is more efficient as these frameworks are presumably optimised? Or simply to make the code more user friendly? This was an interesting article Do not use PHP references.

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  • Useful Command-line Commands on Windows

    - by Sung Meister
    The aim for this Wiki is to promote using a command to open up commonly used applications without having to go through many mouse clicks - thus saving time on monitoring and troubleshooting Windows machines. Answer entries need to specify Application name Commands Screenshot (Optional) Shortcut to commands && - Command Chaining %SYSTEMROOT%\System32\rcimlby.exe -LaunchRA - Remote Assistance (Windows XP) appwiz.cpl - Programs and Features (Formerly Known as "Add or Remove Programs") appwiz.cpl @,2 - Turn Windows Features On and Off (Add/Remove Windows Components pane) arp - Displays and modifies the IP-to-Physical address translation tables used by address resolution protocol (ARP) at - Schedule tasks either locally or remotely without using Scheduled Tasks bootsect.exe - Updates the master boot code for hard disk partitions to switch between BOOTMGR and NTLDR cacls - Change Access Control List (ACL) permissions on a directory, its subcontents, or files calc - Calculator chkdsk - Check/Fix the disk surface for physical errors or bad sectors cipher - Displays or alters the encryption of directories [files] on NTFS partitions cleanmgr.exe - Disk Cleanup clip - Redirects output of command line tools to the Windows clipboard cls - clear the command line screen cmd /k - Run command with command extensions enabled color - Sets the default console foreground and background colors in console command.com - Default Operating System Shell compmgmt.msc - Computer Management control.exe /name Microsoft.NetworkAndSharingCenter - Network and Sharing Center control keyboard - Keyboard Properties control mouse(or main.cpl) - Mouse Properties control sysdm.cpl,@0,3 - Advanced Tab of the System Properties dialog control userpasswords2 - Opens the classic User Accounts dialog desk.cpl - opens the display properties devmgmt.msc - Device Manager diskmgmt.msc - Disk Management diskpart - Disk management from the command line dsa.msc - Opens active directory users and computers dsquery - Finds any objects in the directory according to criteria dxdiag - DirectX Diagnostic Tool eventvwr - Windows Event Log (Event Viewer) explorer . - Open explorer with the current folder selected. explorer /e, . - Open explorer, with folder tree, with current folder selected. F7 - View command history find - Searches for a text string in a file or files findstr - Find a string in a file firewall.cpl - Opens the Windows Firewall settings fsmgmt.msc - Shared Folders fsutil - Perform tasks related to FAT and NTFS file systems ftp - Transfers files to and from a computer running an FTP server service getmac - Shows the mac address(es) of your network adapter(s) gpedit.msc - Group Policy Editor gpresult - Displays the Resultant Set of Policy (RSoP) information for a target user and computer httpcfg.exe - HTTP Configuration Utility iisreset - To restart IIS InetMgr.exe - Internet Information Services (IIS) Manager 7 InetMgr6.exe - Internet Information Services (IIS) Manager 6 intl.cpl - Regional and Language Options ipconfig - Internet protocol configuration lusrmgr.msc - Local Users and Groups Administrator msconfig - System Configuration notepad - Notepad? ;) mmsys.cpl - Sound/Recording/Playback properties mode - Configure system devices more - Displays one screen of output at a time mrt - Microsoft Windows Malicious Software Removal Tool mstsc.exe - Remote Desktop Connection nbstat - displays protocol statistics and current TCP/IP connections using NBT ncpa.cpl - Network Connections netsh - Display or modify the network configuration of a computer that is currently running netstat - Network Statistics net statistics - Check computer up time net stop - Stops a running service. net use - Connects a computer to or disconnects a computer from a shared resource, or displays information about computer connections odbcad32.exe - ODBC Data Source Administrator pathping - A traceroute that collects detailed packet loss stats perfmon - Opens Reliability and Performance Monitor ping - Determine whether a remote computer is accessible over the network powercfg.cpl - Power management control panel applet quser - Display information about user sessions on a terminal server qwinsta - See disconnected remote desktop sessions reg.exe - Console Registry Tool for Windows regedit - Registry Editor rasdial - Connects to a VPN or a dialup network robocopy - Backup/Restore/Copy large amounts of files reliably rsop.msc - Resultant Set of Policy (shows the combined effect of all group policies active on the current system/login) runas - Run specific tools and programs with different permissions than the user's current logon provides sc - Manage anything you want to do with services. schtasks - Enables an administrator to create, delete, query, change, run and end scheduled tasks on a local or remote system. secpol.msc - Local Security Settings services.msc - Services control panel set - Displays, sets, or removes cmd.exe environment variables. set DIRCMD - Preset dir parameter in cmd.exe start - Starts a separate window to run a specified program or command start. - opens the current directory in the Windows Explorer. shutdown.exe - Shutdown or Reboot a local/remote machine subst.exe - Associates a path with a drive letter, including local drives systeminfo -Displays a comprehensive information about the system taskkill - terminate tasks by process id (PID) or image name tasklist.exe - List Processes on local or a remote machine taskmgr.exe - Task Manager telephon.cpl - Telephone and Modem properties timedate.cpl - Date and Time title - Change the title of the CMD window you have open tracert - Trace route wmic - Windows Management Instrumentation Command-line winver.exe - Find Windows Version wscui.cpl - Windows Security Center wuauclt.exe - Windows Update AutoUpdate Client

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  • o3d javascript uncaught referenceerror

    - by David
    hey, im new to javascript and am intersted in creating a small o3d script: <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> <html xmlns="http://www.w3.org/1999/xhtml"> <head> <meta http-equiv="Content-Type" content="text/html; charset=utf-8" /> <title>Test Game Website</title> </head> <body> <script type="text/javascript" src="o3djs/base.js"></script> <script type = "text/javascript" id="myscript"> o3djs.require('o3djs.camera'); window.onload = init; function init(){ document.write("jkjewfjnwle"); } </script> <div align="background"> <div id="game_container" style="margin: 0px auto; clear: both; background-image: url('./tmp.png'); width: 800px; height:600px; padding: 0px; background-repeat: no-repeat; padding-top: 1px;"></div> </div> </body> </html> the browser cant seem to find o3djs/base.js in this line <script type="text/javascript" src="o3djs/base.js"></script> and gives me an uncaught referenceerror at this line o3djs.require('o3djs.camera'); Obviously, because it can't find the o3djs/base.js... I have installed the o3d pluggin from google and they say that should be IT ive tried on firefox, ie and chrome thanks

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  • How can I delete, break, or otherwise convert cross references to simple text in microsoft word 2013

    - by Mr Purple
    Cross referencing figure and table captions is useful while editing a document but can become confude when copying and pasting between large documents. I need to pass my document to a colleague who will collate my document with others and has requested that I remove or delete any cross referencing so that my "correct" cross references do not interfere or get interfered with by any other cross references that may be in my colleagues master collated document. My document will be cut and pasted into the master and no further complicated instructions after that point will be tolerated by my colleague. Is there a simple way to convert my cross references to simple text? I am using microsoft word 2013.

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  • Resources about Excel tables and structured references?

    - by jtolle
    I'm new to Excel-post-2000, and I'd like to learn more about how to use tables (formerly lists) and structured references. Can anyone point me to some good treatments of this topic that go beyond the help? (For example, there are numerous full books about just pivot tables. Something like that for using table would be ideal.)

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  • Book Recommendations for Technical/Solutions Architecture [closed]

    - by giant_squid
    I wish to learn more about Technical and Solutions Architecture. Specifically, I'm concerned with designing HA, Fault-Tolerant Scalable web-based solutions (enough buzzwords ;-). Its a topic I'm familiar with on a technical level having worked as a sysadmin, but I don't know all the buzzwords Architects use and have to brush up on my UML and diagram techniques. I would like a book that describes what architecture is as a discipline and explores standard design patterns, and some do's and don'ts. Do you have any recommendations? I apologise if this sounds vague, its because I am still learning what Architecture is as a discipline having come from a sysadmin background. To be 100% clear I'm looking for books or websites that give broad overviews of what System Design patterns exist and how the discipline works. Thanks Instead of closing the question maybe you could comment on what exactly about it you don't like.

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  • MSBuild: TlbImp error since upgrading to VS 2010

    - by floele
    Hi, since upgrading my project to VS2010, including the use of MSBuild v4 instead of 3.5 (and not making any other changes), I get the following build error and have no clue how to fix it (log from CC.NET): <target name="ResolveComReferences" success="false"> <message level="high"><![CDATA[C:\Programme\Microsoft SDKs\Windows\v7.0A\bin\TlbImp.exe c:\Assemblies\NMSDVDXU.dll /namespace:NMSDVDXLib /machine:X64 /out:obj\x64\Release\Interop.NMSDVDXLib.dll /sysarray /transform:DispRet /reference:c:\Assemblies\Bass.Net.dll /reference:c:\Assemblies\LogicNP.FileView.dll /reference:C:\WINDOWS\Microsoft.NET\Framework\v2.0.50727\mscorlib.dll /reference:C:\WINDOWS\Microsoft.NET\Framework\v2.0.50727\System.Data.dll /reference:C:\WINDOWS\Microsoft.NET\Framework\v2.0.50727\System.Design.dll /reference:C:\WINDOWS\Microsoft.NET\Framework\v2.0.50727\System.dll /reference:C:\WINDOWS\Microsoft.NET\Framework\v2.0.50727\System.Drawing.dll /reference:C:\WINDOWS\Microsoft.NET\Framework\v2.0.50727\System.Management.dll /reference:C:\WINDOWS\Microsoft.NET\Framework\v2.0.50727\System.Windows.Forms.dll /reference:C:\WINDOWS\Microsoft.NET\Framework\v2.0.50727\System.Xml.dll /reference:C:\WINDOWS\assembly\GAC\stdole\7.0.3300.0__b03f5f7f11d50a3a\stdole.dll ]]></message> <error code="TI0000" file="TlbImp"><![CDATA[A single valid machine type compatible with the input type library must be specified.]]></error> <warning code="MSB3283" file="C:\WINDOWS\Microsoft.NET\Framework\v4.0.30319\Microsoft.Common.targets" line="1558" column="9"><![CDATA[Die Wrapperassembly für die Typbibliothek "NMSDVDXLib" wurde nicht gefunden.]]></warning> <message level="high"><![CDATA[C:\Programme\Microsoft SDKs\Windows\v7.0A\bin\TlbImp.exe c:\Assemblies\StarBurnX12.dll /namespace:RocketDivision.StarBurnX /machine:X64 /out:obj\x64\Release\Interop.RocketDivision.StarBurnX.dll /sysarray /transform:DispRet /reference:c:\Assemblies\Bass.Net.dll /reference:c:\Assemblies\LogicNP.FileView.dll /reference:C:\WINDOWS\Microsoft.NET\Framework\v2.0.50727\mscorlib.dll /reference:C:\WINDOWS\Microsoft.NET\Framework\v2.0.50727\System.Data.dll /reference:C:\WINDOWS\Microsoft.NET\Framework\v2.0.50727\System.Design.dll /reference:C:\WINDOWS\Microsoft.NET\Framework\v2.0.50727\System.dll /reference:C:\WINDOWS\Microsoft.NET\Framework\v2.0.50727\System.Drawing.dll /reference:C:\WINDOWS\Microsoft.NET\Framework\v2.0.50727\System.Management.dll /reference:C:\WINDOWS\Microsoft.NET\Framework\v2.0.50727\System.Windows.Forms.dll /reference:C:\WINDOWS\Microsoft.NET\Framework\v2.0.50727\System.Xml.dll /reference:C:\WINDOWS\assembly\GAC\stdole\7.0.3300.0__b03f5f7f11d50a3a\stdole.dll ]]></message> <error code="TI0000" file="TlbImp"><![CDATA[A single valid machine type compatible with the input type library must be specified.]]></error> <warning code="MSB3283" file="C:\WINDOWS\Microsoft.NET\Framework\v4.0.30319\Microsoft.Common.targets" line="1558" column="9"><![CDATA[Die Wrapperassembly für die Typbibliothek "RocketDivision.StarBurnX" wurde nicht gefunden.]]></warning> </target> Problem: A single valid machine type compatible with the input type library must be specified. It only applies to the x64 build of my project, x86 still works fine. Apparently, it tries to build a x64 interop assembly from the x86 DLL located in "C:\Assemblies". When executing the TlbImp command with the x64 DLL which is located in a different directory, it works fine. However, I don't know how I can configure my project to use different COM references for the x86 and x64 build. The OS on which the project is being compiled is WinXP x86. Building worked fine when using VS2005 + MSBuild 3.5 Any help would be highly appreciated. I tried building the upgraded project with MSBuild v3.5, but that doesn't work either. It complains about unknown NoWarn codes (probably new in 4.0).

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  • Why can't I reference child entities with part of the parent entities composite key

    - by tigermain
    I am trying to reference some child entities with part of the parents composite key not all of it, why cant I? This happens when I use the following mapping instead of that which is commented. I get the following error Foreign key in table VolatileEventContent must have same number of columns as referenced primary key in table LocationSearchView <?xml version="1.0" encoding="utf-8" ?> <hibernate-mapping xmlns="urn:nhibernate-mapping-2.2" namespace="JeanieMaster.Domain.Entities" assembly="JeanieMaster.Domain"> <class name="LocationSearchView" table="LocationSearchView"> <composite-id> <key-property name="LocationId" type="Int32"></key-property> <key-property name="ContentProviderId" type="Int32"></key-property> <key-property name="CategoryId" type="Int32"></key-property> </composite-id> <property name="CompanyName" type="String" not-null="true" update="false" insert="false"/> <property name="Description" type="String" not-null="true" update="false" insert="false"/> <property name="CategoryId" type="Int32" not-null="true" update="false" insert="false"/> <property name="ContentProviderId" type="Int32" not-null="true" update="false" insert="false"/> <property name="LocationId" type="Int32" not-null="true" update="false" insert="false"/> <property name="Latitude" type="Double" update="false" insert="false" /> <property name="Longitude" type="Double" update="false" insert="false" /> <bag name="Events" table="VolatileEventContent" where="DeactivatedOn IS NULL" order-by="StartDate DESC" lazy="false" cascade="none"> <key> <column name="LocationId"></column> <column name="ContentProviderId"></column> <!--<column name="LocationId"></column> <column name="ContentProviderId"></column> <column name="CategoryId"></column>--> </key> <one-to-many class="Event" column="VolatileEventContentId"></one-to-many> </bag> </class> </hibernate-mapping> And VolatileEventContent mapping file <?xml version="1.0" encoding="utf-8" ?> <hibernate-mapping xmlns="urn:nhibernate-mapping-2.2" namespace="JeanieMaster.Domain.Entities" assembly="JeanieMaster.Domain"> <class name="Event" table="VolatileEventContent" select-before-update="false" optimistic-lock="none"> <composite-id> <key-property name="LocationId" type="Int32"></key-property> <key-property name="ContentProviderId" type="Int32"></key-property> </composite-id> <property name="Description" type="String" not-null="true" update="false" insert="false"/> <property name="StartDate" type="DateTime" not-null="true" update="false" insert="false" /> <property name="EndDate" type="DateTime" not-null="true" update="false" insert="false" /> <property name="CreatedOn" type="DateTime" not-null="true" update="false" insert="false" /> <property name="ModifiedOn" type="DateTime" not-null="false" update="false" insert="false" /> <many-to-one name="Location" class="Location" column="LocationId" /> <bag name="Artistes" table="EventArtiste" lazy="false" cascade="none"> <key name="VolatileEventContentId" /> <many-to-many class="Artiste" column="ArtisteId" ></many-to-many> </bag> </class> </hibernate-mapping>

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  • Null date reference when passing json to MVC Controller

    - by Jake
    I am building an event system that posts data to a google calendar. I am using jquery 1.4.2, fullcalendar 1.4.5, and asp.net MVC 2. I am using a jquery ui modal dialog for the entry system. Jquery ui datepicker for the from and to fields. Select boxes for the time fields. I have tried both string and DateTime formats in the GCalEvent Class for startDate, startTime, endDate and endTime. I am receiving a null reference with the dates passed to the controllers Action method. var gcalevent = { 'eventID': $('#eventID').val(), 'eventURL': $('#eventURL').val(), 'date': { 'startDate': $("#from").val(), 'startTime': $('#eventStartHour option:selected').val() + ":" + $('#eventStartMin option:selected').val() + $('#eventStartAMPM option:selected').val(), 'endDate': $('#to').val(), 'endTime': $('#eventEndHour option:selected').val() + ":" + $('#eventEndMin option:selected').val() + $('#eventEndAMPM option:selected').val() }, 'allDay': $('#chkAllDay').attr('checked'), 'where': $('#eventWhere').val(), 'eventTitle': $('#eventTitle').val(), 'eventDescription': $('#eventDescription').val() }; $.post("/home/AddRepeatingEvent", gcalevent, addEventCallback); public void AddNonRepeatingEvent(Models.GCalEvent gcalevent) { IGCalRepository _gcalrepo; GCalRepository gcalrepo = new GCalRepository(); _gcalrepo = gcalrepo; //_gcalrepo.AddEvent(gcalevent); GetGoogleEventURL(gcalevent.eventID.ToString()); } public enum Days { Sun, Mon, Tue, Wed, Thur, Fri, Sat } public enum DefaultCalendarView { Month, Day, Week } public enum OrderType { First, Second, Third, Fourth, Last } public abstract class RepeatBaseType { } public class GCalEvent { public string title { get; set; } public string description { get; set; } public string where { get; set; } public bool repeated { get; set; } public bool allDay { get; set; } public DefaultCalendarView defaultCalendarView { get; set; } public GCalEventDate date { get; set; } public RepeatBaseType repeatType { get; set; } public string eventID { get; set; } public string eventURL { get; set; } } public class GCalEventDate { public string startDate { get; set; } public string startTime { get; set; } public string endDate {get;set;} public string endTime {get;set;} } internal class Duration { int Days { get; set; } int Hours { get; set; } int Minutes { get; set; } } public class RepeatedDaily: RepeatBaseType { public int Days { get; set; } } public class RepeatedWeekly : RepeatBaseType { public int Weeks { get; set; } public Days[] days { get; set; } } public class RepeatedMonthly : RepeatBaseType { public int Months { get; set; } public RepeatedMonthlyType repeatedMonthlyType { get; set; } } public class RepeatedYearly : RepeatBaseType { public int Years {get;set;} } public abstract class RepeatedMonthlyType { } public class RepeatedMonthlyDayOfWeek : RepeatedMonthlyType { public Days[] DayOfWeek { get; set; } public OrderType orderType { get; set; } } public class RepeatedMonthlyDayOfMonth : RepeatedMonthlyType { public DateTime DayOfMonth { get; set; } } This is the first time i am attempting to use abastract classes. Thank you for your help.

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  • null reference expction in the code

    - by LifeH2O
    I am getting NullReferenceException error on "_attr.Append(xmlNode.Attributes["name"]);". namespace SMAS { class Profiles { private XmlTextReader _profReader; private XmlDocument _profDoc; private const string Url = "http://localhost/teamprofiles.xml"; private const string XPath = "/teams/team-profile"; public XmlNodeList Teams{ get; private set; } private XmlAttributeCollection _attr; public ArrayList Team { get; private set; } public void GetTeams() { _profReader = new XmlTextReader(Url); _profDoc = new XmlDocument(); _profDoc.Load(_profReader); Teams = _profDoc.SelectNodes(XPath); foreach (XmlNode xmlNode in Teams) { _attr.Append(xmlNode.Attributes["name"]); } } } } the teamprofiles.xml file looks like <teams> <team-profile name="Australia"> <stats type="Test"> <span>1877-2010</span> <matches>721</matches> <won>339</won> <lost>186</lost> <tied>2</tied> <draw>194</draw> <percentage>47.01</percentage> </stats> <stats type="Twenty20"> <span>2005-2010</span> <matches>32</matches> <won>18</won> <lost>12</lost> <tied>1</tied> <draw>1</draw> <percentage>59.67</percentage> </stats> </team-profile> <team-profile name="Bangladesh"> <stats type="Test"> <span>2000-2010</span> <matches>66</matches> <won>3</won> <lost>57</lost> <tied>0</tied> <draw>6</draw> <percentage>4.54</percentage> </stats> </team-profile> </teams> I am trying to extract names of all teams in an ArrayList. Then i'll extract all stats of all teams and display them in my application. Can you please help me about that null reference exception?

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  • Undefined reference to vtable

    - by RyanG
    So, I'm getting the infamously horrible "undefined reference to 'vtable..." error for the following code (The class in question is CGameModule.) and I cannot for the life of me understand what the problem is. At first, I thought it was related to forgetting to give a virtual function a body, but as far as I understand, everything is all here. The inheritance chain is a little long, but here is the related source code. I'm not sure what other information I should provide. My code: class CGameModule : public CDasherModule { public: CGameModule(Dasher::CEventHandler *pEventHandler, CSettingsStore *pSettingsStore, CDasherInterfaceBase *pInterface, ModuleID_t iID, const char *szName) : CDasherModule(pEventHandler, pSettingsStore, iID, 0, szName) { g_pLogger->Log("Inside game module constructor"); m_pInterface = pInterface; } virtual ~CGameModule() {}; std::string GetTypedTarget(); std::string GetUntypedTarget(); bool DecorateView(CDasherView *pView) { //g_pLogger->Log("Decorating the view"); return false; } void SetDasherModel(CDasherModel *pModel) { m_pModel = pModel; } virtual void HandleEvent(Dasher::CEvent *pEvent); private: CDasherNode *pLastTypedNode; CDasherNode *pNextTargetNode; std::string m_sTargetString; size_t m_stCurrentStringPos; CDasherModel *m_pModel; CDasherInterfaceBase *m_pInterface; }; } Inherits from... class CDasherModule; typedef std::vector<CDasherModule*>::size_type ModuleID_t; /// \ingroup Core /// @{ class CDasherModule : public Dasher::CDasherComponent { public: CDasherModule(Dasher::CEventHandler * pEventHandler, CSettingsStore * pSettingsStore, ModuleID_t iID, int iType, const char *szName); virtual ModuleID_t GetID(); virtual void SetID(ModuleID_t); virtual int GetType(); virtual const char *GetName(); virtual bool GetSettings(SModuleSettings **pSettings, int *iCount) { return false; }; private: ModuleID_t m_iID; int m_iType; const char *m_szName; }; Which inherits from.... namespace Dasher { class CEvent; class CEventHandler; class CDasherComponent; }; /// \ingroup Core /// @{ class Dasher::CDasherComponent { public: CDasherComponent(Dasher::CEventHandler* pEventHandler, CSettingsStore* pSettingsStore); virtual ~CDasherComponent(); void InsertEvent(Dasher::CEvent * pEvent); virtual void HandleEvent(Dasher::CEvent * pEvent) {}; bool GetBoolParameter(int iParameter) const; void SetBoolParameter(int iParameter, bool bValue) const; long GetLongParameter(int iParameter) const; void SetLongParameter(int iParameter, long lValue) const; std::string GetStringParameter(int iParameter) const; void SetStringParameter(int iParameter, const std::string & sValue) const; ParameterType GetParameterType(int iParameter) const; std::string GetParameterName(int iParameter) const; protected: Dasher::CEventHandler *m_pEventHandler; CSettingsStore *m_pSettingsStore; }; /// @} #endif

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  • null reference exception in the code

    - by LifeH2O
    I am getting NullReferenceException error on "_attr.Append(xmlNode.Attributes["name"]);". namespace SMAS { class Profiles { private XmlTextReader _profReader; private XmlDocument _profDoc; private const string Url = "http://localhost/teamprofiles.xml"; private const string XPath = "/teams/team-profile"; public XmlNodeList Teams{ get; private set; } private XmlAttributeCollection _attr; public ArrayList Team { get; private set; } public void GetTeams() { _profReader = new XmlTextReader(Url); _profDoc = new XmlDocument(); _profDoc.Load(_profReader); Teams = _profDoc.SelectNodes(XPath); foreach (XmlNode xmlNode in Teams) { _attr.Append(xmlNode.Attributes["name"]); } } } } the teamprofiles.xml file looks like <teams> <team-profile name="Australia"> <stats type="Test"> <span>1877-2010</span> <matches>721</matches> <won>339</won> <lost>186</lost> <tied>2</tied> <draw>194</draw> <percentage>47.01</percentage> </stats> <stats type="Twenty20"> <span>2005-2010</span> <matches>32</matches> <won>18</won> <lost>12</lost> <tied>1</tied> <draw>1</draw> <percentage>59.67</percentage> </stats> </team-profile> <team-profile name="Bangladesh"> <stats type="Test"> <span>2000-2010</span> <matches>66</matches> <won>3</won> <lost>57</lost> <tied>0</tied> <draw>6</draw> <percentage>4.54</percentage> </stats> </team-profile> </teams> I am trying to extract names of all teams in an ArrayList. Then i'll extract all stats of all teams and display them in my application. Can you please help me about that null reference exception?

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  • String Sharing/Reference issue with objects in Delphi

    - by jenakai123
    My application builds many objects in memory based on filenames (among other string based information). I was hoping to optimise memory usage by storing the path and filename separately, and then sharing the path between objects in the same path. I wasn't trying to look at using a string pool or anything, basically my objects are sorted so if I have 10 objects with the same path I want objects 2-10 to have their path "pointed" at object 1's path (eg object[2].Path=object[1].Path); I have a problem though, I don't believe that my objects are in fact sharing a reference to the same string after I think I am telling them to (by the object[2].Path=object[1].Path assignment). When I do an experiment with a string list and set all the values to point to the first value in the list I can see the "memory conservation" in action, but when I use objects I see absolutely no change at all, admittedly I am only using task manager (private working set) to watch for memory use changes. Here's a contrived example, I hope this makes sense. I have an object: TfileObject=class(Tobject) FpathPart: string; FfilePart: string; end; Now I create 1,000,000 instances of the object, using a new string for each one: var x: integer; MyFilePath: string; fo: TfileObject; begin for x := 1 to 1000000 do begin // create a new string for every iteration of the loop MyFilePath:=ExtractFilePath(Application.ExeName); fo:=TfileObject.Create; fo.FpathPart:=MyFilePath; FobjectList.Add(fo); end; end; Run this up and task manager says I am using 68MB of memory or something. (Note that if I allocated MyFilePath outside of the loop then I do save memory because of 1 instance of the string, but this is a contrived example and not actually how it would happen in the app). Now I want to "optimise" my memory usage by making all objects share the same instance of the path string, since it's the same value: var x: integer; begin for x:=1 to FobjectList.Count-1 do begin TfileObject(FobjectList[x]).FpathPart:=TfileObject(FobjectList[0]).FpathPart; end; end; Task Manager shows absouletly no change. However if I do something similar with a TstringList: var x: integer; begin for x := 1 to 1000000 do begin FstringList.Add(ExtractFilePath(Application.ExeName)); end; end; Task Manager says 60MB memory use. Now optimise with: var x: integer; begin for x := 1 to FstringList.Count - 1 do FstringList[x]:=FstringList[0]; end; Task Manager shows the drop in memory usage that I would expect, now 10MB. So I seem to be able to share strings in a string list, but not in objects. I am obviously missing something conceptually, in code or both! I hope this makes sense, I can really see the ability to conserve memory using this technique as I have a lot of objects all with lots of string information, that data is sorted in many different ways and I would like to be able to iterate over this data once it is loaded into memory and free some of that memory back up again by sharing strings in this way. Thanks in advance for any assistance you can offer.

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  • "Undefined reference to"

    - by user1332364
    I know that there are a lot of questions somewhat related to this one, but they answers are a bit hard for me to make sense of. I'm receiving the following error for a few different lines of code: C:\Users\Jeff\AppData\Local\Temp\ccAixtmT.o:football.cpp:(.text+0x6f0): undefined reference to `Player::set_values(int, std::string, float)' From these blocks of code: class Player { int playerNum; string playerPos; float playerRank; public: void set_values(int, string, float); float get_rank(){ return playerRank; }; bool operator == (const Player &p1/*, const Player &p2*/) const { if(&p1.playerNum == &playerNum && &p1.playerPos == &playerPos && &p1.playerRank == &playerRank) return true; else return false; }; }; And this being the main function referencing the subclass: int main() { ifstream infile; infile.open ("input.txt", ifstream::in); int numTeams; string command; while(!infile.fail() && !infile.eof()){ infile >> numTeams; string name; Player p; int playNum; string playPos; float playRank; Player all[11]; float ranks[11]; Team allTeams[numTeams]; for(int i=0; i<numTeams; i++){ infile >> name; for(int j=0; j<11; j++){ infile >> playNum; infile >> playPos; infile >> playRank; if(playPos == "QB") p.set_values(playNum, playPos, (playRank*2.0)); else if(playPos == "RB") p.set_values(playNum, playPos, (playRank*1.5)); else if(playPos == "WR") p.set_values(playNum, playPos, (playRank/1.8)); else if(playPos == "TE") p.set_values(playNum, playPos, (playRank*1.1)); else if(playPos == "GD") p.set_values(playNum, playPos, (playRank/2.0)); else if(playPos == "TC") p.set_values(playNum, playPos, (playRank/2.2)); else if(playPos == "CR") p.set_values(playNum, playPos, (playRank/1.2)); all[j] = p; allTeams[i].set_values(all, name); } } infile >> command; if (command == "play"){ int t1; int t2; infile >> t1; infile >> t2; play(allTeams[t1], allTeams[t2]); } else { int t1; int p1; int t2; int p2; swap(allTeams[t1], allTeams[t1].get_player(p1), allTeams[t2], allTeams[t2].get_player(p2)); } } }

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  • Object reference not set to an instance of an object- Linked List Example

    - by Zoro Roronoa
    I am seeing following errors : Object reference not set to an instance of an object! Check to determinate if the object is null before calling the method! I'am new with C#,and I made a program for Sorted Linked Lists. Here is the code where the error comes! public void Insert(double data) { Link newLink = new Link(data); Link current = first; Link previous = null; if (first == null) { first = newLink; } else { while (data > current.DData && current != null) { previous = current; current = current.Next; } previous.Next = newLink; newLink.Next = current; } } It says that the current referenc is null while (data current.DData && current != null), but I assigned it current = first; Please Help ! The rest is the complete code of the Program! class Link { double dData; Link next=null; public Link Next { get { return next; } set { next = value; } } public double DData { get { return dData; } set { dData = value; } } public Link(double dData) { this.dData = dData; } public void DisplayLink() { Console.WriteLine("Link : "+ dData); } } class SortedList { Link first; public SortedList() { first = null; } public bool IsEmpty() { return (this.first == null); } public void Insert(double data) { Link newLink = new Link(data); Link current = first; Link previous = null; if (first == null) { first = newLink; } else { while (data > current.DData && current != null) { previous = current; current = current.Next; } previous.Next = newLink; newLink.Next = current; } } public Link Remove() { Link temp = first; first = first.Next; return temp; } public void DisplayList() { Link current; current = first; Console.WriteLine("Display the List!"); while (current != null) { current.DisplayLink(); current = current.Next; } } } class SortedListApp { public void TestSortedList() { SortedList newList = new SortedList(); newList.Insert(20); newList.Insert(22); newList.Insert(100); newList.Insert(1000); newList.Insert(15); newList.Insert(11); newList.DisplayList(); newList.Remove(); newList.DisplayList(); } }

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  • mappedBy reference an unknown target entity property - hibernate error

    - by tommy
    first, my classes: User package com.patpuc.model; import java.util.List; import javax.persistence.Column; import javax.persistence.Entity; import javax.persistence.Id; import javax.persistence.OneToMany; import javax.persistence.Table; import com.patpuc.model.RolesMap; @Entity @Table(name = "users") public class User { @Id @Column(name = "USER_ID", unique = true, nullable = false) private int user_id; @Column(name = "NAME", nullable = false) private String name; @Column(name = "SURNAME", unique = true, nullable = false) private String surname; @Column(name = "USERNAME_U", unique = true, nullable = false) private String username_u; // zamiast username @Column(name = "PASSWORD", unique = true, nullable = false) private String password; @Column(name = "USER_DESCRIPTION", nullable = false) private String userDescription; @Column(name = "AUTHORITY", nullable = false) private String authority = "ROLE_USER"; @Column(name = "ENABLED", nullable = false) private int enabled; @OneToMany(mappedBy = "rUser") private List<RolesMap> rolesMap; public List<RolesMap> getRolesMap() { return rolesMap; } public void setRolesMap(List<RolesMap> rolesMap) { this.rolesMap = rolesMap; } /** * @return the user_id */ public int getUser_id() { return user_id; } /** * @param user_id * the user_id to set */ public void setUser_id(int user_id) { this.user_id = user_id; } /** * @return the name */ public String getName() { return name; } /** * @param name * the name to set */ public void setName(String name) { this.name = name; } /** * @return the surname */ public String getSurname() { return surname; } /** * @param surname * the surname to set */ public void setSurname(String surname) { this.surname = surname; } /** * @return the username_u */ public String getUsername_u() { return username_u; } /** * @param username_u * the username_u to set */ public void setUsername_u(String username_u) { this.username_u = username_u; } /** * @return the password */ public String getPassword() { return password; } /** * @param password * the password to set */ public void setPassword(String password) { this.password = password; } /** * @return the userDescription */ public String getUserDescription() { return userDescription; } /** * @param userDescription * the userDescription to set */ public void setUserDescription(String userDescription) { this.userDescription = userDescription; } /** * @return the authority */ public String getAuthority() { return authority; } /** * @param authority * the authority to set */ public void setAuthority(String authority) { this.authority = authority; } /** * @return the enabled */ public int getEnabled() { return enabled; } /** * @param enabled * the enabled to set */ public void setEnabled(int enabled) { this.enabled = enabled; } @Override public String toString() { StringBuffer strBuff = new StringBuffer(); strBuff.append("id : ").append(getUser_id()); strBuff.append(", name : ").append(getName()); strBuff.append(", surname : ").append(getSurname()); return strBuff.toString(); } } RolesMap.java package com.patpuc.model; import javax.persistence.Column; import javax.persistence.Entity; import javax.persistence.Id; import javax.persistence.JoinColumn; import javax.persistence.ManyToOne; import javax.persistence.Table; import com.patpuc.model.User; @Entity @Table(name = "roles_map") public class RolesMap { private int rm_id; private String username_a; private String username_l; //private String username_u; private String password; private int role_id; @ManyToOne @JoinColumn(name="username_u", nullable=false) private User rUser; public RolesMap(){ } /** * @return the user */ public User getUser() { return rUser; } /** * @param user the user to set */ public void setUser(User rUser) { this.rUser = rUser; } @Id @Column(name = "RM_ID", unique = true, nullable = false) public int getRmId() { return rm_id; } public void setRmId(int rm_id) { this.rm_id = rm_id; } @Column(name = "USERNAME_A", unique = true) public String getUsernameA() { return username_a; } public void setUsernameA(String username_a) { this.username_a = username_a; } @Column(name = "USERNAME_L", unique = true) public String getUsernameL() { return username_l; } public void setUsernameL(String username_l) { this.username_l = username_l; } @Column(name = "PASSWORD", unique = true, nullable = false) public String getPassword() { return password; } public void setPassword(String password) { this.password = password; } @Column(name = "ROLE_ID", unique = true, nullable = false) public int getRoleId() { return role_id; } public void setRoleId(int role_id) { this.role_id = role_id; } } when i try run this on server i have exception like this: Error creating bean with name 'SessionFactory' defined in ServletContext resource [/WEB-INF/classes/baseBeans.xml]: Invocation of init method failed; nested exception is org.hibernate.AnnotationException: mappedBy reference an unknown target entity property: com.patpuc.model.RolesMap.users in com.patpuc.model.User.rolesMap But i don't exaclu know what i'm doing wrong. Can somebody help me fix this problem?

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  • Garbage collection in Perl

    - by srikfreak
    Unlike Java, Perl uses reference count for garbage collection. I have tried searching some previous questions which speak about C++ RAII and smart pointers and Java GC but have not understood how Perl deals with the circular referencing problem. Can anyone explain how Perl's garbage collector deals with circular references? Is there any way to reclaim circular referenced memory which are no longer used by the program or does Perl just ignores this problem altogether?

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  • Good JavaScript Books?

    - by jollyjerry
    I find myself using Javascript day to day without a solid understanding of the language. There are some great writeups out there about using specific features of the language, but I'd like a distilled, printed book reference about the language itself. Please list good books that discuss the JavaScript language; not frameworks, usage and quirks.

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  • Arrays multiplication

    - by mariO
    How to write arrayt multiplication (multiplicating two matrieces ie 3x3) of arrays of known size in c++ ? What will be the difference using pointers and reference ?

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  • How to get ref of an array in PHP 5 ?

    - by Relax
    In php 5, all variable and objects are passed by reference, but i can't get my codes work My codes is: $arrayA = array(); $array = $arrayA; ... if(!in_array(thedata, $array) // if i use & to get ref, got an error here, should i use *$array here? $array[] = thedata; var_dump($arrayA); The result is empty, am i missing something simple?

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