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• Can .NET AppDomains do this?

  - by Eloff

  I've spent hours reading up about AppDomains, but I'm not sure they work quite like I'm hoping. If I have two classes, Foo in AppDomain #1, Bar in AppDomain #2: App Domain #1 is the application. App Domain #2 is something like a plugin, and can be loaded and unloaded dynamically. AppDomain #2 wants to create Foo and use it. Foo uses lots of classes in AppDomain #1 internally. I don't want AppDomain #2 using object foo with reflection, I want it to use Foo foo, with all the static typing and compiled speed that goes with it. Can this be done considering that AppDomain #1, containing Foo, is never unloaded? If so, does any remoting take place here when using Foo? When I unload AppDomain #2, the type Foo is destroyed?

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• HashMap "WriteOnce" Implementation .. need help

  - by JavaNewbie

  import java.util.*; public class HashMapExample { public static class WriteOnceMap<K, V> extends HashMap<K, V> { public V put(K key, V value) { /* WriteOnceMap is a map that does not allow changing value for a particular key. It means that put() method should throw IllegalArgumentException if the key is already assosiated with some value in the map. Please implement this method to conform to the above description of WriteOnceMap. */ } public void putAll(Map<? extends K, ? extends V> m) { /* Pleaase implement this method to conform to the description of WriteOnceMap above. It should either (1) copy all of the mappings from the specified map to this map or (2) throw IllegalArgumentException and leave this map intact if the parameter already contains some keys from this map. */ } } }

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• How do develop a Java web application without having to deploy all the time

  - by ChrisSmith..zzZZ

  I've set up a simple Eclipse 3.5/Jetty 6.1 web app which returns hello world. It works. This is on Windows and uses the "Jetty Generic Server Adapter". I have auto deployment working so that it deploys after changes periodically. How do I go about setting it up so that if I change any static content it doesn't have to redeploy i.e I can just hit F5 to see the changes straight away. For minor HTML changes it's quite unusable waiting 20-30 seconds for a deployment.

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• Adding a html file into a c# email app

  - by neilos

  using System; using System.Net; using System.Net.Mail; class MainClass { public static void Main(string[] args) { SmtpClient client = new SmtpClient("192.168.1.12", 25); using (MailMessage msg = new MailMessage()) { msg.From = new MailAddress("[email protected]"); msg.Subject = "***Dexter DB***"; msg.Body = "***DB backup done***"; // I want to change this so i can do this in html file - how do i pick up this file and send a html form? msg.To.Add(new MailAddress("[email protected]")); client.Send(msg); } } }

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• Asp.net mvc html melper

  - by tom

  Hi there Ive got this function as a html helper which should write a javascript function onto the page, I then call this in the masterpage like this <%Html.RenderBaseUrlScript(); % My problem is that the script never seems to be written to the page, I search in the source and cannot see it anywhere, I have tried moving this around from the head to the body of the html masterpage, Im really confused as to why this is not workung, please help public static string RenderBaseUrlScript(this HtmlHelper helper) { return string.Format("<script type='text/javascript'> $.url=function(url){{return '{0}'+url;}}", GetBaseUri()); }

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• Unable to Access UILabel in UITableViewCell

  - by Nirmal

  I am having trouble in accessing which is in the UITableViewCell, that i have placed in my main .xib file. That Label is connected to IBOutlet servicesCell. And the Label inside the table view cell is connected through IBOutlet serviceLabel. At runtime i am not getting the text which i am assining to that label. Following is my sample code for that. static NSString *ServiceIdentifier = @"ServiceIdentifier"; UITableViewCell *cell1 = [tableView dequeueReusableCellWithIdentifier:ServiceIdentifier]; if(cell1 == nil) { [[NSBundle mainBundle] loadNibNamed:@"servicesCell" owner:self options:nil]; cell1 = servicesCell; } // label access serviceLabel = (UILabel *)[cell1 viewWithTag:1]; serviceLabel.numberOfLines = 3; serviceLabel.lineBreakMode = UILineBreakModeWordWrap; [serviceLabel setTextAlignment:UITextAlignmentLeft]; [serviceLabel setText:@"Testing String"]; Anyone have any idea then please help.. Thanks in advance..

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• How to ensure consistency of enums in Java serialization?

  - by Uri

  When I serialize an object, I can use the serialVersionUID mechanism at the class level to ensure the compatibility of the two types. However, what happens when I serialize fields of enum values? Is there a way to ensure that the enum type has not been manipulated between serialization and deserialization? Suppose that I have an enum like OperationResult {SUCCESS, FAIL}, and a field called "result" in an object that is being serialized. How do I ensure, when the object is deserialized, that result is still correct even if someone maliciously reversed the two? (Suppose the enum is declared elsewhere as a static enum) I am wondering out of curiosity - I use jar-level authentication to prevent manipulation.

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• Get name of property as a string

  - by Jim C

  I'm trying to improve the maintainability of some code involving reflection. The app has a .NET Remoting interface exposing (among other things) a method called Execute for accessing parts of the app not included in its published remote interface. Here is how the app designates properties (a static one in this example) which are meant to be accessible via Execute: RemoteMgr.ExposeProperty("SomeSecret", typeof(SomeClass), "SomeProperty"); So a remote user could call: string response = remoteObject.Execute("SomeSecret"); and the app would use reflection to find SomeClass.SomeProperty and return its value as a string. Unfortunately, if someone renames SomeProperty and forgets to change the 3rd parm of ExposeProperty(), it breaks this mechanism. I need to the equivalent of: SomeClass.SomeProperty.GetTheNameOfThisPropertyAsAString() to use as the 3rd parm in ExposeProperty so refactoring tools would take care of renames. Is there a way to do this? Thanks in advance.

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• Client side validation script dissapears with $.ajax()

  - by boris callens

  In my javascript file I'm getting the content of a partial with the following call: $.ajax({ type: "GET", url: value.href.replace(actionType, actionType + 'Partial'), dataType: "html", success: function(result) { $("#DepartmentsAction").html(result); alert(result); } }); Because the partial has the call Html.EnableClientValidation() the resulting html has a static script in it. In the result variable in the ajax call this script is present. In the page where the html gets inserted (#DepartmentsAction) the script has dissapeared. What am I doing wrong?

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• Polymorphic behavior not being implemented

  - by Garrett A. Hughes

  The last two lines of this code illustrate the problem: the compiler works when I use the reference to the object, but not when I assign the reference to an array element. The rest of the code is in the same package in separate files. BioStudent and ChemStudent are separate classes, as well as Student. package pkgPoly; public class Poly { public static void main(String[] arg) { Student[] stud = new Student[3]; // create a biology student BioStudent s1 = new BioStudent("Tom"); // create a chemistry student ChemStudent s2 = new ChemStudent("Dick"); // fill the student body with studs stud[0] = s0; stud[1] = s1; // compiler complains that it can't find symbol getMajor on next line System.out.println("major: " + stud[0].getMajor() ); // doesn't compile; System.out.println("major: " + s0.getMajor() ); // works: compiles and runs correctly } }

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• Is there a way in C# 4.0 to have a method take a delegate with the parameters baked in?

  - by Rob Packwood

  I have this code for reporting on a simple demo app I am writing: private static void ReportOnTimedProcess(Action process) { var stopwatch = new Stopwatch(); stopwatch.Start(); process(); stopwatch.Stop(); Console.WriteLine("Process took {0} seconds", stopwatch.ElapsedMilliseconds*1000); } I basically want to track the time of any process. I am trying to have this method take a delegate as a parameter that can have any number of varying parameters. Is there some way an Expression can do this?

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• Python Class Variables Question

  - by zyq524

  I have some doubt about python's class variables. As my understanding, if I define a class variable, which is declared outside the init() function, this variable will create only once as a static variable in C++. This seems right for some python types, for instance, dict and list type, but for those base type, e.g. int,float, is not the same. For example: class A: dict1={} list1=list() int1=3 def add_stuff(self, k, v): self.dict1[k]=v self.list1.append(k) self.int1=k def print_stuff(self): print self.dict1,self.list1,self.int1 a1 = A() a1.add_stuff(1, 2) a1.print_stuff() a2=A() a2.print_stuff() The output is: {1: 2} [1] 1 {1: 2} [1] 3 I understand the results of dict1 and list1, but why does int1 behavior different?

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• Correct approach to validate attributes of an instance of class

  - by systempuntoout

  Having a simple Python class like this: class Spam(object): __init__(self, description, value): self.description = description self.value = value Which is the correct approach to check these constraints: "description cannot be empty" "value must be greater than zero" Should i: 1.validate data before creating spam object ? 2.check data on __init__ method ? 3.create an is_valid method on Spam class and call it with spam.isValid() ? 4.create an is_valid static method on Spam class and call it with Spam.isValid(description, value) ? 5.check data on setters declaration ? 6.... Could you recommend a well designed\Pythonic\not verbose (on class with many attributes)\elegant approach?

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• what does this string.format piece of code do?

  - by jbkkd

  I have this piece of code in c#: private static void _constructRow(SqlDataReader reader, system.IO.StreamWriter stwr, bool getColumnName) { for (int i = 0; i < reader.FieldCount; i++) stwr.Writeline(String.Format("<td>{0}</td"), getColumnName ? reader.GetName(i) : reader.GetValue(i).ToString())); } I'm trying to understand what the part that start with "getColumnName ?" and ends with ".ToString()" does. I understood that it is a system.object type, but I have no idea what it specifically does or how it works. I want that because of this: "reader" had multiple rows in it, and I want to writeline only specific rows. If anyone can help me on either of those, I'd be grateful.

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• Interesting OOPS puzzle

  - by user3714387

  Recently, faced the below question from one of the interviewer. Initially thought that the question was wrong, but the interviewer mentioned there is solution for this. Quite interesting. Can anyone shed light please ? Program as below. public class BaseHome { public static void main() { Console.WriteLine("A"); } } Required output : B A C Condition : Should not make any change in the Main function. Should not create any additional class. Please advice if this can be done with the condition met.

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• Dynamic-linked DLL needs to share a global variable with its caller.

  - by Fabian Wickborn

  I have a static library libStatic that defines a global variable like this Header file libStatic/globals.h: extern int globvar; Code file libStatic/globals.cpp: int globvar = 42; The DLL libDynamic and the executable runner are using this global variable. Furtheron, libDynamic is linked at run-time into runner (via LoadLibrary(), GetProcAddress(), and the works...) I understand this will lead to globvar being created twice, once in the heap of runner and once in the heap of libDynamic, which is of course very undesirable. Is there a good away around this? How can I ensure that libDynamic and runner are using the same globvar?

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• Java Double Array

  - by user1062058

  I'm having trouble setting up and placing values into an array using a text file containing the floating point numbers 2.1 and 4.3 each number is separated by a space - below is the error I'm getting: Exception in thread "main" java.util.NoSuchElementException import java.util.*; import java.io.*; public class DoubleArray { public static void main(String[] args) throws FileNotFoundException { Scanner in = new Scanner(new FileReader("mytestnumbers.txt")); double [] nums = new double[2]; for (int counter=0; counter < 2; counter++) { int index = 0; index++; nums[index] = in.nextDouble(); } } } Thanks, I'm sure this isn't a hard question to answer... I appreciate your time.

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• Exception handling pattern

  - by treefrog

  It is a common pattern I see where the error codes associated with an exception are stored as Static final ints. when the exception is created to be thrown, it is constructed with one of these codes along with an error message. This results in the method that is going to catch it having to look at the code and then decide on a course of action. The alternative seems to be- declare a class for EVERY exception error case Is there a middle ground ? what is the recommended method ?

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• Retrieving a single Guid in CRM 4.0

  - by user1746560

  I'm new to CRM (version 4.0) and i'm trying to return a 'yearid' guide based on a given year (which is also stored in the entity).So far i've got: public static Guid GetYearID(string yearName) { ICrmService service = CrmServiceFactory.GetCrmService(); // Create the query object. QueryExpression query = new QueryExpression("year"); ColumnSet columns = new ColumnSet(); columns.AddColumn("yearid"); query.ColumnSet = columns; FilterExpression filter = new FilterExpression(); filter.FilterOperator = LogicalOperator.And; filter.AddCondition(new ConditionExpression { AttributeName = "yearName", Operator = ConditionOperator.Equal, Values = new object[] { yearName} }); query.Criteria = filter; } But my questions are: A) What code do in addition to this to actually store the Guid? B) Is using a QueryExpression the most efficient way to do this?

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• Trying to use tcl threads on windows 7 results in access violation.

  - by Juan

  I'm trying to get this simple program to work on windows, but it crashes: unsigned (__stdcall testfoo)(ClientData x) { return 0; } int main() { Tcl_ThreadId testid = 0; Tcl_CreateThread(&testid, testfoo, (ClientData) NULL, TCL_THREAD_STACK_DEFAULT, TCL_THREAD_NOFLAGS); } I am using a makefile generated by cmake and linking against a version of Tcl 8.5.7 I compiled myself using Visual C++ 2008 express. It was compiled using msvcrt,static,threads and the name of the resulting library is tcl85tsx.lib. The error is: Unhandled exception at 0x77448c39 in main.exe: 0xC0000005: Access violation writing location 0x00000014. The Tcl library works fine, and I can even run a threading script example by loading the Thread extension into it. My assumption is that there is something horribly wrong with a memory violation, but I have no idea what. Any help appreciated.

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• Java : Using parent class method to access child class variable

  - by Jayant

  I have the following scenario : public class A { private int x = 5; public void print() { System.out.println(x); } } public class B extends A { private int x = 10; /*public void print() { System.out.println(x); }*/ public static void main(String[] args) { B b = new B(); b.print(); } } On executing the code, the output is : 5. How to access the child class(B's) variable(x) via the parent class method? Could this be done without overriding the print() method (i.e. uncommenting it in B)? [This is important because on overriding we will have to rewrite the whole code for the print() method again]

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• Need to interface to a C++ DLL

  - by Pedro

  Hi, I need to call a C++ API from C#. I have been able to call the API, but the char[] parameters do not seem to be marshalling correctly. Here's the C++ signature: Create2ptModel(double modelPowers[2], double modelDacs[2], int pclRange[2], double targetPowers[32], double *dacAdjustFactor, unsigned short powerRampFactors[32], BOOL bPCLDacAdjusted[32], char calibrationModel[32], char errMsg[1024]) and this is how I am trying to call it from C# [DllImport("AlgorithmsLib.dll", EntryPoint = "_Create2ptModel@36", ExactSpelling = true, CallingConvention = CallingConvention.StdCall, CharSet = CharSet.Auto)] private static extern AlgorithmStatus Create2ptModel( double[] modelPowers, double[] modelDacs, int[] pclRange, double[] targetPowers, ref double dacAdjustFactor, ushort[] powerRampFactors, bool[] bPCLDacAdjusted, /**/char[] calibrationModel, char[] errMsg/**/); Any idea of how I can marshall it correctly? Thanks in advance!

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• How do I build two different installers from the same script in inno?

  - by Tim

  I want to make a "standard" install for external use, but I also want to use the same script and tell it (with a command line param perhaps?) to include another set of files (PDB files for debugging) for our lab installations. How can I do this? Is it possible? I don't see how to set this in the [files] section. NOTE - this is not for having an option during the install. It is for static build time. I suppose it is just best to create a separate installer for the pdbs.

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• what (clip) and DataLine.Info represents...?

  - by user528050

  I got this code from one of my friend. import java.io.*; import javax.sound.sampled.*; public class xx { public static void main(String args[]) { try { File f=new File("mm.wav"); AudioInputStream a=AudioSystem.getAudioInputStream(f); AudioFormat au=a.getFormat(); DataLine.Info di=new DataLine.Info(Clip.class,au); Clip c=(Clip)AudioSystem.getLine(di); c.open(a); c.start(); } catch(Exception e) { System.out.println("Exception caught "); } } } But i didn't understand what this line means Cilp c=(Clip)AudioSystem.getLine(di); what (clip) represents....? And my 2nd problem is what is the DataLine is it an interface and what is the meaning of this statement DataLine.Info....?

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• Print number series in java

  - by user1898282

  I have to print the series shown below in java: ***1*** **2*2** *3*3*3* 4*4*4*4 My current implementation is: public static void printSeries(int number,int numberOfCharsinEachLine){ String s="*"; for(int i=1;i<=number;i++){ int countOfs=(numberOfCharsinEachLine-(i)-(i-1))/2; if(countOfs<0){ System.out.println("Can't be done"); break; } for(int j=0;j<countOfs;j++){ System.out.print(s); } System.out.print(i); for(int k=1;k<i;k++){ System.out.print(s); System.out.print(i); } for(int j=0;j<countOfs;j++){ System.out.print(s); } System.out.println(); } } But there are lot of for loops, so I'm wondering whether this can be done in a better way or not?

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