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• How to return a value based on the type of the generic T

  - by Blankman

  I have a method like: public T Get<T>(string key) { } Now say I want to return "hello" if the type is a string, and 110011 if it is type int. how can I do that? typeof(T) doesn't seem to work. I ideally want to do a switch statement, and return something based on the Type of the generic (string/int/long/etc). Is this possible?

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• Creating a file path in C#

  - by Jason

  So I'm trying to create a path in C#. I use Environment.Machinename and store it a variable serverName. Then I create another string variable and have some other path extension in there. Here is my code so far: string serverName = Environment.MachineName; string folderName = "\\AlarmLogger"; No matter what I do I can't seem to obtain only one backslash prior to AlarmLogger. Any ideas how I can specify a path in C#? Edit: I'm wondering if my code doesn't seem to want to paste correctly. Anyways when i paste it I only see one backslash but my code has two. Because of the escape character sequence. But something like string test = @"\" + serverName + folderName doesn't seem to want to work for me.

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• What is the most efficient way to create emtpy ListBuffer ?

  - by drypot

  What is the most efficient way to create emtpy ListBuffer ? val l1 = new mutable.ListBuffer[String] val l2 = mutable.ListBuffer[String] () val l3 = mutable.ListBuffer.empty[String] There are any pros and cons in difference ?

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• C# equivalent of typeof for fields

  - by rwallace

  With reflection, you can look up a class from a string at run time, but you can also say typeof(Foo) and get compile time type checking, auto completion etc. If what you want is a field not a class, you can look it up from a string at runtime, but if you want compile time type checking etc., is there anyway to say something like fieldof(Foo.Bar)? I know the name of both the class and the field in advance, and I want to be able to refer to the field at compile time rather than with a run-time string lookup.

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• how to export a 2D table in java

  - by kate

  hello i would like to ask you about the 2D tables in java!!my code is this an i would like to make a system out in order t see the registrations in mytable citylink can anyone help me? int i=0; while(i<=citylink.length){ for(Xml polh_is:fetchsite.child("site").child("poleis").children("polh")){ //url if((polh_is.string("name")=="")||(polh_is.content()==""))//attribute error += "Error in polh: name is - " + polh_is.string("name") + " with url - " + polh_is.content() + " -.\n"; else for(int j=0; j<citylink.length; j++){ citylink[j][0]=HtmlMethods.removeBreaks(polh_is.string("name")); citylink[j][1]=HtmlMethods.removeBreaks(polh_is.string("with url -"+polh_is.content() +"-.\n")); i++; } }

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• get attribute value from html code in java

  - by sang

  Hi All i have HTML string value and i want to get one attribute(id) value from that html String value can u help me how to do it?? String msHTMLFile = "<ABBR class='HighlightClass' id='highlight40001' style=\"BACKGROUND-COLOR: yellow\" >Fetal/Neonatal Morbidity and Mortality</ABBR>"; result should come - highlight40001;

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• Is read-only auto-imlemented property possible?

  - by abatishchev

  Hello. I found a topic on MSDN that talks that yes, this is possible. I did a test that seems to break this statement: using System; namespace Test { class Program { static void Main(string[] args) { Foo f = new Foo("1"); Console.WriteLine(f.Bar); // prints 1 f.Test("2"); Console.WriteLine(f.Bar);// successfully prints 2 } } class Foo { public Foo(string b) { this.Bar = b; } public string Bar { get; private set; } public void Test(string b) { // this would be impossible for readonly field! // next error would be occur: CS0191 or CS0191 // A readonly field cannot be assigned to (except in a constructor or a variable initializer) this.Bar = b; } } } Where am I wrong?

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• rails script/generate scaffold problem

  - by palecoder

  I'm new to rails and was trying out the scaffold command - the following scaffold runs and works when I view it via web brick script/generate book title:string the following fails - gives me a weird route error script/generate application name:string the following works script/generate app name:string can anyone shed some light on this? Is 'application' a reserved word?

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• Index of arrays and strings in c++

  - by anurag18294

  I want to know from where the index of a string and an array starts from. I am getting a lot of confusion while making programs. While calculating string length of a string is the null character also counted.

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• Need Regex for to match special situations

  - by Daniel

  I'm desperately searching for regular expressions that match these scenarios: 1) Match alternating chars I've a string like "This is my foobababababaf string" - and I want to match "babababa" Only thing I know is the length of the fragment to search - I don't know what chars/digits that might be - but they are alternating. I've really no clue where to start :( 2) Match combined groups In a string like "This is my foobaafoobaaaooo string" - and I want to match "aaaooo". Like in 1) I don't know what chars/digits that might be. I only know that they will appear in two groups. I experimented using (.)\1\1\1(.)\1\1\1 and things like this...

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• Converting C# class to JavaScript

  - by AgileMeansDoAsLittleAsPossible

  Take a look at this basic class: namespace AcmeWeb { public string FirstName { get; set; } public class Person { public Person(string firstName, string lastName) { if (String.IsNullOrEmpty(firstName)) { throw new ArgumentNullException(firstName); } this.FirstName = firstName; } } } What's the best translation of this into JavaScript? This is what I'm thinking: (function(namespace) { namespace.Person = function(firstName, lastName) { // Constructor (function() { if (!firstName) { throw "'firstName' argument cannot be null or empty"; } })(); // Private memberts var _ = { firstName: firstName }; // Public members this.firstName = function(value) { if (typeof(value) === "undefined") { return _.firstName; } else { _.firstName = value; return this; } }; }; })(AcmeWeb);

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• c language:make fgets to keep taking input until I press enter twice?

  - by wello horld

  hi I would like to ask how I would modify this code for the question: (It only accepts one input then prints it out. I want it to keep going until I hit enter (\n) twice. #include <stdio.h> #define MAXLENGTH 1000 int main(void) { char string[MAXLENGTH]; fgets(string, MAXLENGTH, stdin ); printf("%s\n", string); return 0; } I'm confused at the fgets(string, MAXLENGTH, stdin ); line, what does stdin mean/do?

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• I want to create an expression for querystrings, this stuff is hard!

  - by jkirkerx

  I want to extract some keywords out of a query string for a search application in asp.net. I decoded the url string first, so it's plain text I have this to start with, but I want to add a keyword group I'd like to trim off the stuff for pure words, but not sure if that's possible I also have a long list of possible query string value fields that I want to check against ?q= @q= ?qs= &qs=

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• Need help with map (c++, STL)

  - by Mike Dooley

  Hi folks! Actually I'm new to C++. I tried something out (actually the map container) but it doesn't work the way I assumed it will... Before posting my code, I will explain it shortly. I created 3 classes: ClassA ClassDerivedA ClassAnotherDerivedA The two last ones are derived from "ClassA". Further I created a map: map<string,ClassA> test_map; I put some objects (from Type ClassDerivedA and ClassAnotherDerivedA) into the map. Keep in mind: the mapped value is from type "ClassA". This will only work because of Polymorphism. Finally I created an iterator which runs over my map and compares the user input with my keys in the map. If they match, it will call a specific method called "printOutput". And there is the Problem: Although i declared "printOutput" as "virtual" the only method called is the one from my base class, but why? and here is the code: #include <iostream> #include <map> using namespace std; class ClassA { public: virtual void printOutput() { cout << "ClassA" << endl; } }; class ClassDerivedA : public ClassA { public: void printOutput() { cout << "ClassDerivedA" << endl; } }; class ClassAnotherDerivedA: public ClassA { public: void printOutput() { cout << "ClassAnotherDerivedA" << endl; } }; int main() { ClassDerivedA class_derived_a; ClassAnotherDerivedA class_another_a; map<string,ClassA> test_map; test_map.insert(pair<string,ClassA>("deriveda", class_derived_a)); test_map.insert(pair<string,ClassA>("anothera", class_another_a)); string s; while( cin >> s ) { if( s != "quit" ) { map<string,ClassA>::iterator it = test_map.find(s); if(it != test_map.end()) it->second.printOutput(); } else break; } } Blockquote

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• How do i resolve method Overlapping in java/Processing [duplicate]

  - by user3718913

  This question already has an answer here: How do I compare strings in Java? 24 answers I have two methods/function in a class, called, Qestion1 and Question2, i want it in such a way that after the user has answered Question one correctly, the Question 2 method is called. Whenever i call the method 2, it displays both of them together instead exiting the first method first. Here's a dummy code to illustrate what i'm saying: void Question1() { String question="What is the capital of England?"; String Answer="London"; if(Answer=='London') { Question2(); } } void Question2() { String question="What is the capital of California?"; String Answer="Sacramento"; if(Answer=='Sacramento') { Question3(); } } Pls, this question is in no way related to that other question. Pls peruse the thread again.

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• wifi provider onLocationChanged is never called

  - by Kelsie

  I got a weird problem. I uses wifi to retrieve user location. I have tested on several phones; on some of them, I could never get a location update. it seemed that the method onLocationChanged is never called. My code is attached below.. Any suggestions appreciated!!! @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.main); LocationManager locationManager; locationManager = (LocationManager)getSystemService(Context.LOCATION_SERVICE); String provider = locationManager.NETWORK_PROVIDER; Location l = locationManager.getLastKnownLocation(provider); updateWithNewLocation(l); locationManager.requestLocationUpdates(provider, 0, 0, locationListener); } private void updateWithNewLocation(Location location) { TextView myLocationText; myLocationText = (TextView)findViewById(R.id.myLocationText); String latLongString = "No location found"; if (location != null) { double lat = location.getLatitude(); double lng = location.getLongitude(); latLongString = "Lat:" + lat + "\nLong:" + lng; } myLocationText.setText("Your Current Position is:\n" + latLongString); } private final LocationListener locationListener = new LocationListener() { public void onLocationChanged(Location location) { updateWithNewLocation(location); Log.i("onLocationChanged", "onLocationChanged"); Toast.makeText(getApplicationContext(), "location changed", Toast.LENGTH_SHORT).show(); } public void onProviderDisabled(String provider) {} public void onProviderEnabled(String provider) {} public void onStatusChanged(String provider, int status, Bundle extras) {} }; Manifest <uses-permission android:name="android.permission.ACCESS_FINE_LOCATION" /> <uses-permission android:name="android.permission.ACCESS_COARSE_LOCATION"/> <uses-permission android:name="android.permission.ACCESS_NETWORK_STATE"/> <uses-permission android:name="android.permission.ACCESS_WIFI_STATE"/> <uses-permission android:name="android.permission.INTERNET"/>

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• SQL query doesn't get inserted

  - by Deejdd

  I've been trying to get my query to work for some time it runs but doesn't insert anything nor does it return any errors. The database connection is open and is successfuly connection. The Table is called errorlog and holds the following data - id (int autoincremental, Primary key, Unique) - exception (varchar) - time (DateTime) exception = String(error message) time = DateTime.Now Here's the code: public void insertError(string error, DateTime time) { SqlCeParameter[] sqlParams = new SqlCeParameter[] { new SqlCeParameter("@exception", error), new SqlCeParameter("@time", time) }; try { cmd = new SqlCeCommand(); cmd.Connection = connection; cmd.CommandType = CommandType.Text; cmd.CommandText = "INSERT INTO errorlog (exception, time) VALUES(@exception, @time)"; cmd.Parameters.AddRange(sqlParams); cmd.ExecuteNonQuery(); } catch (Exception e) { Console.WriteLine(e.Message); } } Any help would be appreciated, Thanks in advance. EDIT Removed quotes around @exception Heres the connection: protected DataController() { try { string appPath = System.IO.Path.GetDirectoryName(Assembly.GetAssembly(typeof(DataController)).CodeBase).Replace(@"file:\", "") + @"\"; string strCon = @"Data Source = " + appPath + @"Data\EasyShop.sdf"; connection = new SqlCeConnection(strCon); } catch (Exception e) { } connection.Open(); } Finally the way it gets called: public bool log(string msg, bool timestamp = true) { DataController dc = DataController.Instance(); dc.insertError(msg, DateTime.Today); return true; }

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• Is it a good practice to have trim in setter?

  - by zibi

  I'm doing a code review and I noticed such a code: @Entity @Table(name = "SOME_TABLE") public class SomeReportClass { @Column(name = "REPORT_NUMBER", length = 6, nullable = false) private String reportNumber; ..... public String getReportNumber() { return reportNumber; } public void setReportNumber(String reportNumber) { this.reportNumber = StringUtils.trimToNull(reportNumber); } } Every time I see trimming inside of a setter I feel that its not the clearest solution - what is the general practice with that issue?

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• display data from tables that contain a null value

  - by user2631662

  I need the code below to say - if myReader reads a null entry a new method is called. At the moment it will not display data from tables that contain a null value conDataBase.Open(); myReader = cmdDataBase.ExecuteReader(); while (myReader.Read()) { if (myReader["Code_CodeID"] != DBNull.Value) { string sFirst = myReader["First"].ToString(); string sLast = myReader["Last"].ToString(); string sAdd1 = myReader["Address1"].ToString(); string sCode = myReader["Code"].ToString(); txtFirst.Text = sFirst; txtSecond.Text = sLast; txtadd1.Text = sAdd1; txtDeviceIMEI.Text = sCode; } } } else { //go to a new method } }

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• How to discard const in c++

  - by Vincenzo

  This is what I'm trying to do and I can't: #include <string> using namespace std; class A { bool has() const { return get().length(); } string& get() { return s; } private: string s; }; The error I'm getting is: passing ‘const A’ as ‘this’ argument of ‘std::string& A::get()’ discards qualifiers I understand what the problem is, but how can I fix it? I really need has() to be const. Thanks.

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• How to match !x but not !!x in JS regex?

  - by mpeterson

  Given the following text: This is!!xa simple string!xpattern I would like to get a regexp that matches the !x that's between "string" and "pattern" but not !!xa that's between "is" and "a". This regexp is to be used inside a string split(). I have tried several combinations but I cannot get a regexp that meets my needs. Perhaps my expression is not so regular after all =) Thanks in advance!

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• How to get an item value of json using C#?

  - by user3487837

  How to get an item value of json using C#? json: [{ ID: '6512', fd: [{ titie: 'Graph-01', type: 'graph', views: { graph: { show: true, state: { group: 'DivisionName', series: ['FieldWeight', 'FactoryWeight', 'Variance'], graphType: 'lines-and-points' } } } }, { titie: 'Graph-02', type: 'Graph', views: { graph: { show: true, state: { group: 'DivisionName', series: ['FieldWeight', 'FactoryWeight', 'Variance'], graphType: 'lines-and-points' } } } }] }, { ID: '6506', fd: [{ titie: 'Map-01', type: 'map', views: { map: { show: true, state: { kpiField: 'P_BudgetAmount', kpiSlabs: [{ id: 'P_BudgetAmount', hues: ['#0fff03', '#eb0707'], scales: '10' }] } } } }] }] Above mentioned one is json, Here titie value will be get in a list please help me... my code is: string dashletsConfigPath = Url.Content("~/Content/Dashlets/Dashlets.json"); string jArray = System.IO.File.ReadAllText(Server.MapPath(dashletsConfigPath)) List<string> lists = new List<string>(); JArray list = JArray.Parse(jArray); var ll = list.Select(j => j["dashlets"]).ToList();

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• Strange issue with cout

  - by ben

  After reading from a text file, and storing it into a string, I tried to pass this message into another function that will print it out. This is what it looks like: http://imgur.com/MCjfRdp void insert (int id, string message){ cout << "Inserting " << message << " at" << endl; } Somehow the message behind the string overrides the message. But once I removed the " at" after message, it worked as expected. http://imgur.com/JdHPPmi void insert (int id, string message){ cout << "Inserting " << message << endl; } I somehow suspect the problem came from stringstream, but i couldn't find out where. Here's the code that read from file vector <string> line; fstream infile; string readLine, tempLine, action, tempLine1; int level, no; infile.open(fileName.c_str(),ios::in); int i = 0; while (!infile.eof()) { getline (infile, readLine); line.push_back(readLine); } infile.close(); line.pop_back(); for (int i = 0; i < line.size();i++) { stringstream ss (line.at(i)); getline (ss, action, ' '); if (action == "init") { // some other work here } else if (action == "insert") { tempLine = line.at(i); ss >> no; stringstream iline(tempLine); getline (iline, tempLine1, ' '); getline (iline, tempLine1, ' '); getline (iline, tempLine1, '\n'); Insert (no, tempLine1); } Since my file has different kinds of actions, here is what test.dat contains: insert 0 THIS IS A TEST edit: When i did file.txt, it came out as something like this. Inserting THIS IS A TEST at Inserting THIS IS TEST NO 2 at

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• MediaType of REST

  - by user357243

  Hi, I am beginner in REST web services. I wrote a program of REST to display the HTML or XML. The @Path annotation's value is @Path("{typeDocument}"). There are two methods for GET : @GET @Produces(MediaType.TEXT_XML) public String getXml(@PathParam("typeDocument") String typeDocument) to display XML file, and @GET @Produces(MediaType.TEXT_HTML) public String getHtml(@PathParam("typeDocument") String typeDocument) to display HTML. The browser Firefox always excutes getHtml() when URL is either http://localhost:8080/sources/html or localhost:8080/sources/xml But IE always excutes getXml(). How to excute the correct method, as defined by URL, in different browser ? Thanks a lot.

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• how to create a linked list in java without using util package? [closed]

  - by aparna

  I do not want to use any of the elements of the UTIL package. I tried but I am not able to get to the next node. Can anyone please help me out? Thanks in advance. I have put up this much. public class Element { private String s; private Element next; } public Element(String s) { this.s = s; this.next = null; } public void setNext(Element e) { this.next = e; } public String getString() { return this.s; } public Element getNext() { return this.next; } public String toString() { return "[" + s + "] => "; } public void add(String s) { int index = 0; System.out.println("Adding at index: " + index); Element curr = new Element(s); Element e = this.data[index]; if (e == null) { this.data[index] = curr; return; } while(e.getNext() != null) { e = e.getNext(); } e.setNext(curr); } }

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