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  • Ruby: Calling class method from instance

    - by Peter
    In Ruby, how do you call a class method from one of that class's instances? Say I have class Truck def self.default_make # Class method. "mac" end def initialize # Instance method. Truck.default_make # gets the default via the class's method. # But: I wish to avoid mentioning Truck. Seems I'm repeating myself. end end the line Truck.default_make retrieves the default. But is there a way of saying this without mentioning Truck? It seems like there should be.

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  • calling a method from an event handler

    - by Ayoub
    I have this code i am working on but every time i call init method I keep getting an error this.addElement is not a function is it because i can't call methods from event handlers ? function editor () { this.init = function () { $("#area").bind('click' , this.click_event ); } this.addElement = function () { console.log("adding element"); } this.click_event = function(event) { this.addElement(); console.log("click event in x : "+event.data); } }

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  • struts2 action not calling properly

    - by Ziplin
    On default I want my struts2 app to forward to an action: <?xml version="1.0" encoding="UTF-8" ?> <!DOCTYPE struts PUBLIC "-//Apache Software Foundation//DTD Struts Configuration 2.0//EN" "http://struts.apache.org/dtds/struts-2.0.dtd"> <struts> <constant name="struts.enable.DynamicMethodInvocation" value="false" /> <constant name="struts.devMode" value="false" /> <package name="myApp" namespace="/myApp" extends="struts-default"> <action name="Login_*" method="{1}" class="myApp.SessionManager"> <result name="input">/myApp/Login.jsp</result> <result type="redirectAction">Menu</result> </action> </package> <package name="default" namespace="/" extends="struts-default"> <default-action-ref name="index" /> <action name="index"> <result type="redirectAction"> <param name="actionName">Login_input.action</param> <param name="namespace">/myApp</param> </result> </action> </package> </struts> I'm looking for the application to call SessionManager.input(), but instead it calls SessionManager.execute().

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  • Compilation errors calling find_if using a functor

    - by Jim Wong
    We are having a bit of trouble using find_if to search a vector of pairs for an entry in which the first element of the pair matches a particular value. To make this work, we have defined a trivial functor whose operator() takes a pair as input and compares the first entry against a string. Unfortunately, when we actually add a call to find_if using an instance of our functor constructed using a temporary string value, the compiler produces a raft of error messages. Oddly (to me, anyway), if we replace the temporary with a string that we've created on the stack, things seem to work. Here's what the code (including both versions) looks like: typedef std::pair<std::string, std::string> MyPair; typedef std::vector<MyPair> MyVector; struct MyFunctor: std::unary_function <const MyPair&, bool> { explicit MyFunctor(const std::string& val) : m_val(val) {} bool operator() (const MyPair& p) { return p.first == m_val; } const std::string m_val; }; bool f(const char* s) { MyFunctor f(std::string(s)); // ERROR // std::string str(s); // MyFunctor f(str); // OK MyVector vec; MyVector::const_iterator i = std::find_if(vec.begin(), vec.end(), f); return i != vec.end(); } And here's what the most interesting error message looks like: /usr/include/c++/4.2.1/bits/stl_algo.h:260: error: conversion from ‘std::pair, std::allocator , std::basic_string, std::allocator ’ to non-scalar type ‘std::string’ requested Because we have a workaround, we're mostly curious as to why the first form causes problems. I'm sure we're missing something, but we haven't been able to figure out what it is.

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  • Calling a WCF from ASP.NET with same the single-signon user LogonUserIdentity

    - by Dennis Cheung
    I have a ASP.NET MVC page, which call WCF logic. The system is single-signon using NTML. Both the ASP page and the WCF will use the UserIdentity to get user login information. Other then NTML, I will also have a Form based authorization (with AD) in same system. The ASP page, is it simple and I can have it from HttpContext.Current.Request.LogonUserIdentity. However, it seem it is missing from the WCF which call by the ASP, not from browser. How to configure to pass the ID pass from the ASP to the WCF?

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  • External class-calling

    - by anonymous
    Hi guys i have a bit of a problem with a few classes, and i would be very grateful if someone can help me out. So i have: Already compiled executable (for whom i don't have the source) A class in that program that i want to call The program doesn't have export for the class, and that's my problem i don't have definition for this class, so is there a way to get a callback to this class? Example: In the compiled executable: foo::bar (example) { printf(example); } My app: CALLBACK(foo::bar, "this text must be passed as argument") Or in other words i want to call a class in other executable (without having its source) and pass arguments to its function.

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  • Jelly bean not calling onPrepareOptionsMenu() when opening the menu for the first time

    - by syloc
    I'm overriding onPrepareOptionsMenu to hide and show menu items. When testing it with the API level 16 emulator; onPrepareOptionsMenu is not called when opening the menu for the first time. But when i reopen the menu it works. The problem is only with the first usage. You can simple test it with this; @Override public void onPrepareOptionsMenu(Menu menu) { Toast.makeText(this.getActivity(), "pre", Toast.LENGTH_SHORT).show(); super.onPrepareOptionsMenu(menu); } Any ideas?

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  • Any danger in calling flash messages html_safe?

    - by PreciousBodilyFluids
    I want a flash message that looks something like: "That confirmation link is invalid or expired. Click here to have a new one generated." Where "click here" is of course a link to another action in the app where a new confirmation link can be generated. Two drawbacks: One, since link_to isn't defined in the controller where the flash message is being set, I have to put the link html in myself. No big deal, but kind of messy. Number two: In order for the link to actually display properly on the page I have to html_safe the flash display function in the view, so now it looks like (using Haml): - flash.each do |name, message| = content_tag :div, message.html_safe This gives me pause. Everything else I html_safe has been HTML I've written myself in helpers and whatnot, but the contents of the flash hash are stored in a cookie client-side, and could conceivably be changed. I've thought through it, and I don't see how this could result in an XSS attack, but XSS isn't something I have a great understanding of anyway. So, two questions: 1. Is there any danger in always html_safe-ing all flash contents like this? 2. The fact that this solution is so messy (breaking MVC by using HTML in the controller, always html_safe-ing all flash contents) make me think I'm going about this wrong. Is there a more elegant, Rails-ish way to do this? I'm using Rails 3.0.0.beta3.

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  • Jquery: Calling functions from different documents

    - by Tom
    Hi, I've got some Jquery functions that I keep in a "custom.js" file. On some pages, I need to pass PHP variables to the Jquery so some Jquery bits need to remain in the HTML documents. However, as I'm now trying to refactor things to the minimum, I'm tripping over the following: If I put this in my custom.js: $(document).ready(function() { function sayHello() { alert("hello"); } } And this in a HTML document: <script type="text/javascript"> $(document).ready(function() { sayHello(); }); </script> ... the function doesn't get called. However, if both are placed in the HTML document, the function works fine. Is there some kind of public property I need to declare for the function or how do I get Jquery functions in my HTML to talk to external .js files? They're correctly included and work fine otherwise. Thanks.

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  • Program hangs when calling parseFrom for java implementation of protobuf

    - by cornerback84
    I have a message (say its called OuterMessage) message OuterMessage { optional int64 id = 1; optional InnerMessage inner = 2; } and an inner message message InnerMessage { optional string type = 1; optioanl int64 id = 2; } Now when I call parseFrom on OuterMessage like OuterMessage.parseFrom(buffer) the method never returns and nor does it throw any exception. But if I do InnerMessage.parseFrom(buffer) it returns an empty InnerMessage instance. I am serializing the message using protobuf-net. Any idea what might be causing the issue?

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  • C# Calling Methods in Generic Classes

    - by aip.cd.aish
    I am extending the ImageBox control from EmguCV. The control's Image property can be set to anything implementing the IImage interface. All of the following implement this interface: Image<Bgr, Byte> Image<Ycc, Byte> Image<Hsv, Byte> Now I want to call the Draw method on the object of the above type (what ever it may be). The problem is when I access the Image property, the return type is IImage. IImage does not implement the Draw method, but all of the above do. I believe I can cast the object of type IImage to one of the above (the right one) and I can access the Draw method. But how do I know what the right one is? If you have a better way of doing this, please suggest that as well.

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  • Calling subactivity from subactivity

    - by yogsma
    I have three activities in my android app. First activity is main application screen which gives option to open second screen containing second activity. But when I click on the button on second activity which was supposed to open third activity screen, I get "Application has stopped unexpectedly" error. <?xml version="1.0" encoding="utf-8"?> <manifest xmlns:android="http://schemas.android.com/apk/res/android" package="org.anddev.android.SampleApp" android:versionCode="1" android:versionName="1.0"> <application android:icon="@drawable/icon" android:label="@string/app_name"> <activity android:name=".FirstActivity" android:label="@string/app_name"> <intent-filter> <action android:name="android.intent.action.MAIN" /> <category android:name="android.intent.category.LAUNCHER" /> </intent-filter> </activity> <activity android:name=".SecondActivity" android:label="@string/app_name" > </activity> <activity android:name=".ThirdActivity" android:label="@string/app_name" > </activity> </application>

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  • Memeory Leak in Windows Page file when calling a shell command

    - by Arno
    I have an issue on our Windows 2003 x64 Build Server when invoking shell commands from a script. Each call causes a "memory leak" in the page file so it grows quite rapidly until it reaches the maximum and the machine stops working. I can reproduce the problem very nicely by running a perl script like for ($count=1; $count<5000; $count++) { system "echo huhu"; } It is independent of he scripting language as the same happens with lua: for i=1,5000 do os.execute("echo huhu") end I found somebody describing the same issue with php at http://www.issociate.de/board/post/454835/Memory_leak_occurs_when_exec%28%29_function_is_used_on_Windows_platform.html His solution: Firewall/Virus Scanner does not apply, neither are running on the machine. We can also reproduce the issue on other Developer Machines running XP 64, but not on XP 32 Bit. I also found an article describing a leak situation in page file at http://www.programfragment.com/ The guilty guy for the allocation is C:\WINDOWS\System32\svchost.exe -k netsvcs which runs all the basic Windows services. Does anybody know the issue and how to resolve it ?

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  • Calling unmanaged c++ code in C# Mixed with STL

    - by Turtle
    Hey, I want to call unmanaged c++ code in C# The function interface is like following(I simplified it to make it easy to understand) Face genMesh(int param1, int param2); Face is a struct defined as: struct Face{ vector<float> nodes; vector<int> indexs; } I googled and read the MSDN docs found ways to call simple c/c++ unmanged code in C#, also know how to hand the struct as return value. And My question is how to handle "vector". I did not find rules about mapping between vector and some types in C# Thanks!

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  • asp.net vb user control raising an event on the calling page

    - by jvcoach23
    i'm trying to learn about user controls. I created a user control that has a textbox and a button. What i'd like to be able to do is when i click the button in the user control, populate a label in the aspx page. I understand that i could just have a button on the page that uses some properties on the user control to get that information.. but i'd like to know how to do it with the button the user control.. the reason for this is the button is just an example.. a learning tool. if i can get this working, i'd likely be putting thing in the user control that might require this kind of passing information. Anyway.. i've found some c# examples that i tried to get working as vb.. but once started getting into the delegates and events.. well.. it made me turn to this post. anyway.. hopefully someone can lend a hand.

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  • Calling a function within a jQuery plug-in

    - by Bob Knothe
    I am in the process of creating my first jQuery plug-in that will format numbers automatically to various international formats. There are a couple functions within the plug-in that strips the strings and re-formats the string that needs to be called from another jQuery script. Based on the plug-in structure below (let me know if you need the entire code) can I call and send the parameter(s) to the stripFormat(ii) and targetFormat(ii, iv) functions? Or do I need to change my plug-in structure and if so how? (function($){ var p = $.extend({ aNum: '0123456789', aNeg: '-', aSep: ',', aDec: '.', aInput: '', cPos: 0 }); $.fn.extend({ AutoFormat: function() { return this.each(function() { $(this).keypress(function (e){ code here; }); $(this).keyup(function (e){ code here; }); // Would like to call this function from another jQuery script - see below. function stripFormat(ii){ code here; } // Would like to call this function from another jQuery script - see below. function targetFormat(ii, iv){ code here; } }); } }); })(jQuery); Methods trying to call the plug-in functions: jQuery(function(){ $("input").change(function (){ //temp function to demonstrate the stripFormat() function. document.getElementById(targetElementid).value = targetFormat(targetElementid, targetValue); }); }); I have tried to use these variations without success: document.getElementById(targetElementid).value = $.targetFormat(targetElementid, targetValue); document.getElementById(targetElementid).value = $.autoFormat().targetFormat(targetElementid, targetValue);

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  • Calling DLL functions from VB6.

    - by Tim Ring
    I've got a Windows DLL that I wrote, written in C/C++ (all exported functions are 'C'). The DLL works fine for me in VC++. I've given the DLL to another company who do all their development in VB. They seem to be having a problem linking to the functions. I haven't used VB in ten years and I don't even have it installed. What could be the problem? I've declared all my public functions as follows: define MYDCC_API __declspec(dllexport) MYDCCL_API unsigned long MYDCC_GetVer( void); . . . Any ideas? Finally got back to this today and have it working. The answers put me on the right track but I found this most helpful: http://www.codeproject.com/KB/DLL/XDllPt2.aspx Also, I had a few problems passing strings to the DLL functions, I found this helpful: http://www.flipcode.com/archives/Interfacing_Visual_Basic_And_C.shtml

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  • Sql CLR calling webservice throws exception

    - by TonyP
    I have clr stored procedure that calls a Webservice method. Webmethod in turn call a com object .. and do some processing on a remote Unix server. When I invoke webmethod by it self it works fine. But when called from the CLR I get the following exception.. What am I doing wrong ? Msg 6522, Level 16, State 1, Procedure PrintOa, Line 0 A .NET Framework error occurred during execution of user-defined routine or aggregate "PrintOa": System.Security.HostProtectionException: Attempted to perform an operation that was forbidden by the CLR host. The protected resources (only available with full trust) were: All The demanded resources were: Synchronization System.Security.HostProtectionException: at System.Reflection.MethodBase.PerformSecurityCheck(Object obj, RuntimeMethodHandle method, IntPtr parent, UInt32 invocationFlags) at System.Reflection.RuntimeConstructorInfo.Invoke(BindingFlags invokeAttr, Binder binder, Object[] parameters, CultureInfo culture) at System.Diagnostics.TraceUtils.GetRuntimeObject(String className, Type baseType, String initializeData) at System.Diagnostics.TypedElement.BaseGetRuntimeObject() at System.Diagnostics.ListenerElement.GetRuntimeObject() at System.Diagnostics.ListenerElementsCollection.GetRuntimeObject() at System.Diagnostics.TraceInternal.get_Listeners() at System.Diagnostics.TraceInternal.WriteLine(Object value) at System.Diagnostics.Debug.WriteLine(Object value) at BaaNOA.PrintOA(String trid)

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  • Calling same function until it connect to server

    - by user171523
    I am in the process of designing a system where i need to keep on trying to connect to MQ server unitl i get a connection. By default if the MQ is not availlble it will thorugh exception. How can call the same method again and again until i get the connection. I know i can use recursion, is there any better way to do it . Becuase i would like to avoid infinite loops. I also want to wait the the furthere processing until i get connection. I am using .net 2.0 with C#. It is window Service application.

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  • calling invokeAndWait from the EDT

    - by Aly
    Hi, I have a problem following from my previous problem. I also have the code SwingUtillities.invokeAndWait somewhere else in the code base, but when I remove this the gui does not refresh. If I dont remove it the error I get is: Exception in thread "AWT-EventQueue-0" java.lang.Error: Cannot call invokeAndWait from the event dispatcher thread at java.awt.EventQueue.invokeAndWait(Unknown Source) at javax.swing.SwingUtilities.invokeAndWait(Unknown Source) at game.player.humanplayer.model.HumanPlayer.act(HumanPlayer.java:69) The code in HumanPlayer.act is: public Action act(final Action[] availiableActions) { try { SwingUtilities.invokeAndWait(new Runnable() { @Override public void run() { gui.update(availiableActions); } }); } catch (InterruptedException e) { e.printStackTrace(); } catch (InvocationTargetException e) { e.printStackTrace(); } synchronized(performedAction){ while(!hasPerformedAction()){ try { performedAction.wait(); } catch (InterruptedException e) { e.printStackTrace(); } } setPerformedAction(false); } return getActionPerfomed(); }

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  • How i calling UITableViewController in UITabBarController screen using Navigation bar on button clic

    - by Rajendra Bhole
    Hi, My i have to develop simple window based iphone application. In my first screen I design the UITabBarController with four TabBarButton.On first Tab screen contains three buttons. When i click on of the button, the screen should navigate on simple tableView screen.But tableView screen the TabBarController should have be visible. Means simply first replacing with table view and move back to again previous one(The UITabBarController should be visible on all srceen).

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  • calling a method on the parent page from a user control

    - by Kyle
    I am using a user control that I created (just a .cs file not an .ascx file), that does some magic and depending on a value generated by the control, I need it to do something on the parent page that is 'hosting' the control. It needs to call a method under certain circumstances (method is on the parent control). the control is placed on the parent page like so: <customtag:MyControl ID="something" runat="server" /> I'm dynamically creating buttons etc on the control itself but when a button is clicked, let's say for example that there's a text box on the control and if the value of the textbox is "bob" it needs to call a method on the page that's housing the control...how can I accomplish this?

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  • iPhone not returning to application after calling eMail send

    - by Bill
    I am sending an email from within my iPhone application. The eMail page pops up ok, I click on the Send button, the iPhone plays a whoosh sound, and the eMail actually arrives at the recipient. Unfortunately, the mail dialog still sits there unresponsive, and the only option - to click the home button - kills the app. Is there something else that needs to be specified to close the eMailMessage view? MFMailComposeViewController *eMailMessage; NSArray *toAddress; if ([MFMailComposeViewController canSendMail]) { toAddress = [NSArray arrayWithObject:@"[email protected]"]; eMailMessage = [[MFMailComposeViewController alloc] init]; [eMailMessage setToRecipients:toAddress]; [eMailMessage setSubject:@"Notification"]; [eMailMessage setMessageBody:@"Performed by ..." isHTML:NO]; [self presentModalViewController:eMailMessage animated:YES]; [eMailMessage release]; }

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  • Calling a method with getattr in Python

    - by brain_damage
    How to call a method using getattr? I want to create a metaclass, which can call non-existing methods of some other class that start with the word 'oposite_'. The method should have the same number of arguments, but to return the opposite result. def oposite(func): return lambda s, *args, **kw: not oposite(s, *args, **kw) class Negate(type): def __getattr__(self, name): if name.startswith('oposite_'): return oposite(self.__getattr__(name[8:])) def __init__(self,*args,**kwargs): self.__getattr__ = Negate.__getattr__ class P(metaclass=Negate): def yep(self): return True But the problem is that self.__getattr__(sth) returns a NoneType object. >>> p = P() >>> p.oposite_yep() Traceback (most recent call last): File "<pyshell#115>", line 1, in <module> p.oposite_yep() TypeError: <lambda>() takes at least 1 positional argument (0 given) How to deal with this?

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  • calling a function in a click event

    - by KATy
    hi, i ve data in d sql DB using those values i ve to call a function in the system.. data in sql location of func:c:\ namespace:calci class name:arith function name:add parameter 1: 1 parameter 2: 2 now we ve use the values c:\,calci,arith,add,1,2 using this we ve to calculate the result.. thanx..

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