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  • creating objects in list

    - by prince23
    List myList = new List { new Users{ Name="Kumar", Gender="M", Age=75, Parent="All"}, new Users{ Name="Suresh",Gender="M", Age=50, Parent="Kumar"}, new Users{ Name="Bennette", Gender="F",Age=45, Parent="Kumar"}, new Users{ Name="kian", Gender="M",Age=20, Parent="Suresh"}, new Users{ Name="Nathani", Gender="M",Age=15, Parent="Suresh"}, new Users{ Name="Peter", Gender="M",Age=90, Parent="All"}, new Users{ Name="Mica", Age=56, Gender="M",Parent="Peter"}, new Users{ Name="Linderman", Gender="M",Age=51, Parent="Peter"}, new Users{ Name="john", Age=25, Gender="M",Parent="Mica"}, new Users{ Name="tom", Gender="M",Age=21, Parent="Mica"}, new Users{ Name="Ando", Age=64, Gender="M",Parent="All"}, new Users{ Name="Maya", Age=24, Gender="M",Parent="Ando"}, new Users{ Name="Niki Sanders", Gender="F",Age=2, Parent="Maya"}, new Users{ Name="Angela Patrelli", Gender="F",Age=3, Parent="Maya"}, }; now i need to format the data like here i need to check the parent based on the parent i will be creating objects under the parent objects now { Name="Kumar", Gender="M", Age=75, Parent="All" } this is the top level as a property Parent ="all" now under parent object kumar here we again create a new object to store these information under object(kumar who is the parent) new Users{ Name="Suresh",Gender="M", Age=50, Parent="Kumar"}, new Users{ Name="Bennette", Gender="F",Age=45, Parent="Kumar"}, what i need to do here is i need to check the parent based on the parent create further objects under it ex: i need to achive like this. looking for the syntax how i can do it. public class SampleProjectData { public static ObservableCollection<Product> GetSampleData() { DateTime dtS = DateTime.Now; ObservableCollection<Product> teams = new ObservableCollection<Product>(); teams.Add(new Product() { PDName = "Product1", OverallStartTime = dtS, OverallEndTime = dtS + TimeSpan.FromDays(3), }); Project emp = new Project() { PName = "Project1", OverallStartTime = dtS + TimeSpan.FromDays(1), OverallEndTime = dtS + TimeSpan.FromDays(6) }; emp.Tasks.Add(new Task() { StartTime = dtS, EndTime = dtS + TimeSpan.FromDays(2), TaskName = "John's Task 3" }); emp.Tasks.Add(new Task() { StartTime = dtS + TimeSpan.FromDays(3), EndTime = dtS + TimeSpan.FromDays(4), TaskName = "John's Task 2" }); teams[0].Projects.Add(emp); emp = new Project() { PName = "Project2", OverallStartTime = dtS + TimeSpan.FromDays(1.5), OverallEndTime = dtS + TimeSpan.FromDays(5.5) }; emp.Tasks.Add(new Task() { StartTime = dtS + TimeSpan.FromDays(1), EndTime = dtS + TimeSpan.FromDays(4), TaskName = "Victor's Task" }); teams[0].Projects.Add(emp); emp = new Project() { PName = "Project3", OverallStartTime = dtS + TimeSpan.FromDays(2), OverallEndTime = dtS + TimeSpan.FromDays(5) }; emp.Tasks.Add(new Task() { StartTime = dtS + TimeSpan.FromDays(1), EndTime = dtS + TimeSpan.FromDays(4), TaskName = "Jason's Task 1" }); emp.Tasks.Add(new Task() { StartTime = dtS + TimeSpan.FromDays(7), EndTime = dtS + TimeSpan.FromDays(9), TaskName = "Jason's Task 2" }); teams[0].Projects.Add(emp); teams.Add(new Product() { PDName = "Product2", OverallStartTime = dtS, OverallEndTime = dtS + TimeSpan.FromDays(3) }); emp = new Project() { PName = "Project4", OverallStartTime = dtS + TimeSpan.FromDays(0.5), OverallEndTime = dtS + TimeSpan.FromDays(3.5) }; emp.Tasks.Add(new Task() { StartTime = dtS + TimeSpan.FromDays(1.5), EndTime = dtS + TimeSpan.FromDays(4), TaskName = "Vicky's Task" }); teams[1].Projects.Add(emp); emp = new Project() { PName = "Project5", OverallStartTime = dtS + TimeSpan.FromDays(2), OverallEndTime = dtS + TimeSpan.FromDays(6) }; emp.Tasks.Add(new Task() { StartTime = dtS + TimeSpan.FromDays(2.2), EndTime = dtS + TimeSpan.FromDays(3.8), TaskName = "Oleg's Task 1" }); emp.Tasks.Add(new Task() { StartTime = dtS + TimeSpan.FromDays(5), EndTime = dtS + TimeSpan.FromDays(6), TaskName = "Oleg's Task 2" }); emp.Tasks.Add(new Task() { StartTime = dtS + TimeSpan.FromDays(8), EndTime = dtS + TimeSpan.FromDays(9.6), TaskName = "Oleg's Task 3" }); teams[1].Projects.Add(emp); emp = new Project() { PName = "Project6", OverallStartTime = dtS + TimeSpan.FromDays(2.5), OverallEndTime = dtS + TimeSpan.FromDays(4.5) }; emp.Tasks.Add(new Task() { StartTime = dtS + TimeSpan.FromDays(0.8), EndTime = dtS + TimeSpan.FromDays(2), TaskName = "Kim's Task" }); teams[1].Projects.Add(emp); teams.Add(new Product() { PDName = "Product3", OverallStartTime = dtS, OverallEndTime = dtS + TimeSpan.FromDays(3) }); emp = new Project() { PName = "Project7", OverallStartTime = dtS + TimeSpan.FromDays(5), OverallEndTime = dtS + TimeSpan.FromDays(7.5) }; emp.Tasks.Add(new Task() { StartTime = dtS + TimeSpan.FromDays(1.5), EndTime = dtS + TimeSpan.FromDays(4), TaskName = "Balaji's Task 1" }); emp.Tasks.Add(new Task() { StartTime = dtS + TimeSpan.FromDays(5), EndTime = dtS + TimeSpan.FromDays(8), TaskName = "Balaji's Task 2" }); teams[2].Projects.Add(emp); emp = new Project() { PName = "Project8", OverallStartTime = dtS + TimeSpan.FromDays(3), OverallEndTime = dtS + TimeSpan.FromDays(6.3) }; emp.Tasks.Add(new Task() { StartTime = dtS + TimeSpan.FromDays(1.75), EndTime = dtS + TimeSpan.FromDays(2.25), TaskName = "Li's Task" }); teams[2].Projects.Add(emp); emp = new Project() { PName = "Project9", OverallStartTime = dtS + TimeSpan.FromDays(2), OverallEndTime = dtS + TimeSpan.FromDays(6) }; emp.Tasks.Add(new Task() { StartTime = dtS + TimeSpan.FromDays(2), EndTime = dtS + TimeSpan.FromDays(3), TaskName = "Stacy's Task" }); teams[2].Projects.Add(emp); return teams; } } above is an sample data where i am grouping them with static data in the same way i need **to for teh data which is cmg from DB and i need to store them list** all these three data are comig from different services. and i am storing them in a list now i have three tables data Product , Project, Task. all the data are coming from webservies. i have created three list where i am storing the data in list. List<Project>objpro= new List<Project>(); List<Product>objproduct= new List<Product>(); LIst<Task>objTask= new List<Task>(); **now what i need to do is i need to do the mapping between these tables. if you see above. i have object of Product under Product i have added object of Project and then under project object i have added task object.** now from the above data which is stored in the list i need to do the same mapping between class. and group the data. public class Product : INotifyPropertyChanged { public Product() { this.Projects = new ObservableCollection<Project>(); } public string PDName { get; set; } public ObservableCollection<Project> Projects { get; set; } private DateTime _st; public DateTime OverallStartTime { get { return _st; } set { if (this._st != value) { TimeSpan dur = this._et - this._st; this._st = value; this.OnPropertyChanged("OverallStartTime"); this.OverallEndTime = value + dur; } } } private DateTime _et; public DateTime OverallEndTime { get { return _et; } set { if (this._et != value) { this._et = value; this.OnPropertyChanged("OverallEndTime"); } } } #region INotifyPropertyChanged Members protected void OnPropertyChanged(string name) { if (this.PropertyChanged != null) this.PropertyChanged(this, new PropertyChangedEventArgs(name)); } public event PropertyChangedEventHandler PropertyChanged; #endregion } public class Project : INotifyPropertyChanged { public Project() { this.Tasks = new ObservableCollection<Task>(); } public string PName { get; set; } public ObservableCollection<Task> Tasks { get; set; } DateTime _st; public DateTime OverallStartTime { get { return _st; } set { if (this._st != value) { TimeSpan dur = this._et - this._st; this._st = value; this.OnPropertyChanged("OverallStartTime"); this.OverallEndTime = value + dur; } } } DateTime _et; public DateTime OverallEndTime { get { return _et; } set { if (this._et != value) { this._et = value; this.OnPropertyChanged("OverallEndTime"); } } } #region INotifyPropertyChanged Members protected void OnPropertyChanged(string name) { if (this.PropertyChanged != null) this.PropertyChanged(this, new PropertyChangedEventArgs(name)); } public event PropertyChangedEventHandler PropertyChanged; #endregion } public class Task : INotifyPropertyChanged { public string TaskName { get; set; } DateTime _st; public DateTime StartTime { get { return _st; } set { if (this._st != value) { TimeSpan dur = this._et - this._st; this._st = value; this.OnPropertyChanged("StartTime"); this.EndTime = value + dur; } } } private DateTime _et; public DateTime EndTime { get { return _et; } set { if (this._et != value) { this._et = value; this.OnPropertyChanged("EndTime"); } } } #region INotifyPropertyChanged Members protected void OnPropertyChanged(string name) { if (this.PropertyChanged != null) this.PropertyChanged(this, new PropertyChangedEventArgs(name)); } public event PropertyChangedEventHandler PropertyChanged; #endregion } hope my question is clear

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  • RESTful interface for C++/Qt ?

    - by Berschi
    I want to integrate the RESTful-API in my Qt-Project. I already read the example on this page, but this is only for receiving data from a RESTful-interface, not for sending new data to the server. In Java, I can use RESTlet for example, is there any possibility to use something like that for Qt, too? Or is there even a simple way to send data from Qt to RESTful, for example when I create a XML before?

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  • Updating DataGridView from another Form using BackGroundWorker

    - by FezKazi
    Hi! I Have one Form (LoginForm) which has a Background Worker Monitoring a database for new entries. Then I have another Form (AdminForm) which I need to signal to update its datagrids whenever new data is available. I could poll the database in the AdminForm too, but considering that LoginForm is already doing some polling, which can be costly, I just want to signal AdminForm to update the DataGridViews with the new data. You may ask, why is LoginForm doing the polling when youre showing the stuff in the AdminForm? Well, LoginForm is actually processing the data and sending it over the Serial Port :$ heheh. I want it to be able to process the data without having an administrator logged in all the time.

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  • L2E delete exception

    - by 5YrsLaterDBA
    I have following code to delete an user from database: try { var user = from u in db.Users where u.Username == username select u; if (user.Count() > 0) { db.DeleteObject(user.First()); db.SaveChanges(); } } but I got exception like this: at System.Data.Mapping.Update.Internal.UpdateTranslator.Update(IEntityStateManager stateManager, IEntityAdapter adapter) at System.Data.EntityClient.EntityAdapter.Update(IEntityStateManager entityCache) at System.Data.Objects.ObjectContext.SaveChanges(Boolean acceptChangesDuringSave) at System.Data.Objects.ObjectContext.SaveChanges() at MyCompany.SystemSoftware.DQMgr.User.DeleteUser(String username) in C:\workspace\SystemSoftware\SystemSoftware\src\dqm\User.cs:line 479 The Users table is referenced by few other tables. It is probably caused by the foreign key constraint?

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  • How can I import a text file into javascript from an external website using jquery $get()?

    - by Edward Tanguay
    When the button in the following script gets clicked, it should load in the contents of the file "http://tanguay.info/knowsite/data.txt" and display it on the screen. What is the correct syntaxt so that the .get() function retrieves the data from the external website and puts it in #content? <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd"> <html xmlns="http://www.w3.org/1999/xhtml"> <head> <script type="text/javascript" src="http://www.google.com/jsapi"></script> <script type="text/javascript"> google.load("jquery", "1.3.2"); google.setOnLoadCallback(function() { $('#toggleButton').click(loadDataFromExernalWebsite); }); function loadDataFromExernalWebsite() { $('#content').html('new content'); //$.get("http://tanguay.info/knowsite/data.txt", function(data) { alert(data); }, ); } </script> </head> <body> <p>Click the button to load content:</p> <p id="content"></p> <input id="toggleButton" type="button" value="load content"/> </body> </html>

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  • Does jQuery strip some html elements from a string when using .html()?

    - by Nic Hubbard
    I have a var that contains a full html page, including the head, html, body, etc. When I pass that string into the .html() function, jQuery strips out all those elements, such as body, html, head, etc, which I don't want. My data var contains: <html> <head> <title>Untitled Document</title> </head> <body> </body> </html> // data is a full html document string data = $('<div/>').html(data); // jQuery stips my document string! alert(data.find('head').html()); I am needing to manipulate a full html page string, so that I can return what is in the element. I would like to do this with jQuery, but it seems all of the methods, append(), prepend() and html() all try to convert the string to dom elements, which remove all the other parts of a full html page. Is there another way that I could do this? I would be fine using another method. My final goal is to find certain elements inside my string, so I figured jQuery would be best, since I am so used to it. But, if it is going to trim and remove parts of my string, I am going to have to look for another method. Ideas?

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  • SQL Compact error: Unable to load DLL 'sqlceme35.dll'. The specified module could not be found

    - by Ciaran Bruen
    Hi - I'm developing a Winforms application using Visual Studio 2008 C# that uses a SQL compact 3.5 database on the client. The client will most likely be 32 bit XP or Vista machines. I'm using a standard Windows Installer project that creates an msi file and setup.exe to install the app on a client machine. I'm new to SQL compact so I haven't had to distribute a client database like this before now. When I run the setup.exe (on new Windows XP 32 bit with SP2 and IE 7) it installs fine but when I run the app I get the error below: Unable to load DLL 'sqlceme35.dll'. The specified module could not be found I spent a few hours searching this error already but all I can find are issues relating to installing on 64 bit Windows, none relating to normal 32 bit that I'm using. The install app copies the all the dependant files that it found into the specified install directory, including the System.Data.SqlServerCe.dll file (assembly version 3.5.1.0). The database file is in a directory called 'data' off the application directory, and the connection string for it is <add name="Tickets.ieOutlet.Properties.Settings.TicketsLocalConnectionString" connectionString="Data Source=|DataDirectory|\data\TicketsLocal.sdf" providerName="Microsoft.SqlServerCe.Client.3.5" /> Some questions I have: should the app be able to find the dll if it's in the same directory i.e. local to the app, or do I need to install it in the GAC? (If so cam I use the Windows Installer to install a dll in the GAC?) is there anything else I need to distribute with the app in order to use a Sql Compact database? there are other dlls also such as MS interop for exporting data to Excel on the client. Do these need to be installed in the GAC or will locating them in the application directory suffice? TIA, Ciaran.

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  • Transalation of tasks in .NET 1.1 to .NET 3.5

    - by ggonsalv
    In .Net 1.1 I would run a stored procedure to fill a typed dataset. I would use a Datareader to fill the dataset for speed (though it was probably not necessary) Then I would use the Dataset to bind to multiple controls on the page so as to render the data to multiple CSS/javsript based tabs on the page. This would also reduce the database call to 1. So I know I could this in 3.5, but is there a better way. For example can one stored procedure create an EDM object to be used. Since the data is mainly readonly should I even bother changing or keep using the Stored proc -> Data set -> Bind individual controls to specific data tables

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  • Crazy VS Designer Errors

    - by BlueRaja
    Here's a strange one. After renaming a class, one of my forms began giving me errors in the designer, refusing to open. Funny thing is, the form worked just fine when I ran the program. I began reverting my changes to deduce the problem. I have now reverted completely back to the last commit - in which I know the form was working in the designer - cleaned the solution, and deleted the bin/ and obj/ folders, as well as the *.suo file for good measure. The form still does not display in designer. Here are the errors it gives: Could not find 'MyNamespace.MyControl'. Please make sure that the assembly that contains this type is referenced. If this type is a part of your development project, make sure that the project has been successfully built. The variable 'myControl1' is either undeclared or was never assigned. The variable is both declared and assigned, and MyControl builds fine (again, the form works fine when the program is actually run). Stranger still, if I try to create a new form and drag a MyControl onto it, I get this Entity-Framework error: Failed to create component 'MyControl'. The error message follows: 'System.ArgumentException: The specified named connection is either not found in the configuration, not intended to be used with the EntityClient provider, or not valid. at System.Data.EntityClient.EntityConnection.ChangeConnectionString(String newConnectionString) at System.Data.EntityClient.EntityConnection..ctor(String connectionString) at System.Data.Objects.ObjectContect.CreateEntityConnection(String connectionString) etc. etc. There is nothing wrong with my connection string: it worked before, and, again, it works when I actually run the program (the control already exists on the old form from the previous commit). Any ideas whatsoever? I am completely at a loss. [Edit] The only significant code: MyControl.cs public MyControl() { _entities = new MyEFEntities(); //Entity-framework generated class } MyForm.Designer.cs private void InitializeComponent() { this.myControl1 = new MyNamespace.MyControl(); ... this.Controls.Add(this.myControl1); } MyEFDatabase.Designer.cs public MyEFEntities() : base("name=MyEFEntities", "MyEFEntities") { ... } App.Config <connectionStrings> <add name="MyEFEntities" connectionString="metadata=res://*/MyEFDatabase.csdl|res://*/MyEFDatabase.ssdl|res://*/MyEFDatabase.msl;provider=System.Data.SqlClient;provider connection string=&quot;Data Source=MyDatabaseServer;Initial Catalog=MyDatabase;Integrated Security=True;MultipleActiveResultSets=True&quot;" providerName="System.Data.EntityClient" /> </connectionStrings> I've tried the "replace &quot; with '" trick - didn't help. [Edit2] It is happening to new projects also, but not immediately. Only after fiddling around a bit (it has something to do with adding a many-to-one relationship that EF did not figure out on its own), but I can't figure out the exact steps to reproduce.

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  • Using Dynamics AX's Business Conectors to Generate Sales Orders

    - by FelipeFiali
    So, just like the title says, I need to create an application that gets data from another Database, and shoves it through Dynamics AX's throat. This data comes from a portal, not Enterprise Portal, but a PHP one. It stores some data from the order in a separate database. So as said, I need to 'import' that to AX, creating the sales orders with the data I have from the other database. Also I'd like some references on Business Conector too, does it handle all those RECIDS and references that AX uses for me? Thanks in advance. EDIT: OK, I'm able to insert records in AX's database, theres just one problem. I can't generate the internal ID. Like, the 'AccountNum' field for the CustTable. Is there a way to capture it from business connector?

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  • Connect to SQL Server Compact Edition in SSIS

    - by user218795
    Till now I've been exporting data INTO the SQL Server CE database, but now in SSIS I'm attempting to source data that was inserted in a previous step of the import. The SSIS fails during validation with the following error Error: Microsoft.SqlServer.Dts.Runtime.DtsCouldNotCreateManagedConnectionException: Could not create a managed connection manager. I am attempting to use the ADO NET Source that connects to the Data Source using the Microsoft.SqlServerCe.Client.3.5 provider (i.e. ADO.NET connection manager). I CAN preview the data in the ADO.NET Source editor, but the package validation fails due to the above error.

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  • How to include multiple tables programmaticaly into a Sweave document using R

    - by PaulHurleyuk
    Hello, I want to have a sweave document that will include a variable number of tables in. I thought the example below would work, but it doesn't. I want to loop over the list foo and print each element as it's own table. % \documentclass[a4paper]{article} \usepackage[OT1]{fontenc} \usepackage{longtable} \usepackage{geometry} \usepackage{Sweave} \geometry{left=1.25in, right=1.25in, top=1in, bottom=1in} \listfiles \begin{document} <<label=start, echo=FALSE, include=FALSE>>= startt<-proc.time()[3] library(RODBC) library(psych) library(xtable) library(plyr) library(ggplot2) options(width=80) #Produce some example data, here I'm creating some dummy dataframes and putting them in a list foo<-list() foo[[1]]<-data.frame(GRP=c(rep("AA",10), rep("Aa",10), rep("aa",10)), X1=rnorm(30), X2=rnorm(30,5,2)) foo[[2]]<-data.frame(GRP=c(rep("BB",10), rep("bB",10), rep("BB",10)), X1=rnorm(30), X2=rnorm(30,5,2)) foo[[3]]<-data.frame(GRP=c(rep("CC",12), rep("cc",18)), X1=rnorm(30), X2=rnorm(30,5,2)) foo[[4]]<-data.frame(GRP=c(rep("DD",10), rep("Dd",10), rep("dd",10)), X1=rnorm(30), X2=rnorm(30,5,2)) @ \title{Docuemnt to test putting a variable number of tables into a sweave Document} \author{"Paul Hurley"} \maketitle \section{Text} This document was created on \today, with \Sexpr{print(version$version.string)} running on a \Sexpr{print(version$platform)} platform. It took approx \input{time} sec to process. <<label=test, echo=FALSE, results=tex>>= cat("Foo") @ that was a test, so is this <<label=table1test, echo=FALSE, results=tex>>= print(xtable(foo[[1]])) @ \newpage \subsection{Tables} <<label=Tables, echo=FALSE, results=tex>>= for(i in seq(foo)){ cat("\n") cat(paste("Table_",i,sep="")) cat("\n") print(xtable(foo[[i]])) cat("\n") } #cat("<<label=endofTables>>= ") @ <<label=bye, include=FALSE, echo=FALSE>>= endt<-proc.time()[3] elapsedtime<-as.numeric(endt-startt) @ <<label=elapsed, include=FALSE, echo=FALSE>>= fileConn<-file("time.tex", "wt") writeLines(as.character(elapsedtime), fileConn) close(fileConn) @ \end{document} Here, the table1test chunk works as expected, and produced a table based on the dataframe in foo[[1]], however the loop only produces Table(underscore)1.... Any ideas what I'm doing wrong ?

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  • Binary Tree in C Insertion Error

    - by Paul
    I'm quite new to C and I'm trying to implement a Binary Tree in C which will store a number and a string and then print them off e.g. 1 : Bread 2 : WashingUpLiquid etc. The code I have so far is: #include <stdio.h> #include <stdlib.h> #define LENGTH 300 struct node { int data; char * definition; struct node *left; struct node *right; }; struct node *node_insert(struct node *p, int value, char * word); void print_preorder(struct node *p); int main(void) { int i = 0; int d = 0; char def[LENGTH]; struct node *root = NULL; for(i = 0; i < 2; i++) { printf("Please enter a number: \n"); scanf("%d", &d); printf("Please enter a definition for this word:\n"); scanf("%s", def); root = node_insert(root, d, def); printf("%s\n", def); } printf("preorder : "); print_preorder(root); printf("\n"); return 0; } struct node *node_insert(struct node *p, int value, char * word) { struct node *tmp_one = NULL; struct node *tmp_two = NULL; if(p == NULL) { p = (struct node *)malloc(sizeof(struct node)); p->data = value; p->definition = word; p->left = p->right = NULL; } else { tmp_one = p; while(tmp_one != NULL) { tmp_two = tmp_one; if(tmp_one->data > value) tmp_one = tmp_one->left; else tmp_one = tmp_one->right; } if(tmp_two->data > value) { tmp_two->left = (struct node *)malloc(sizeof(struct node)); tmp_two = tmp_two->left; tmp_two->data = value; tmp_two->definition = word; tmp_two->left = tmp_two->right = NULL; } else { tmp_two->right = (struct node *)malloc(sizeof(struct node)); tmp_two = tmp_two->right; tmp_two->data = value; tmp_two->definition = word; tmp_two->left = tmp_two->right = NULL; } } return(p); } void print_preorder(struct node *p) { if(p != NULL) { printf("%d : %s\n", p->data, p->definition); print_preorder(p->left); print_preorder(p->right); } } At the moment it seems to work for the ints but the description part only prints out for the last one entered. I assume it has something to do with pointers on the char array but I had no luck getting it to work. Any ideas or advice? Thanks

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  • Sockets server design advice

    - by Rob
    We are writing a socket server in c# and need some advice on the design. Background: Clients (from mobile devices) connect to our server app and we leave their socket open so we can send data back down to them whenever we need to. The amount of data varies but we generally send/receive data from each client every few seconds, so it's quite intensive. The amount of simultaneous connections can range from 50-500 (and more in the future). We have already written a server app using async sockets and it works, however we've come across some stumbling blocks and we need to make sure that what we're doing is correct. We have a collection which holds our client states (we have no socket/connection pool at the moment, should we?). Each time a client connects we create a socket and then wait for them to send us some data and in receiveCallBack we add their clientstate object to our connections dictionary (once we have verified who they are). When a client object then signs off we shutdown their socket and then close it as well as remove them from our collection of clients dictionary. Presumably everything happens in the right order, everything works as expected. However, almost everyday it stops accepting connections, or so we think, either that or it connects but doesn't actually do anything past that and we can't work out why it's just stopping. There are few things that we'r'e unsure about 1) Should we be creating some kind of connection pool as opposed to just a dictionary of client sockets 2) What happens to the sockets that connect but then don't get added to our dictionary, they just linger around in memory doing nothing, should we create ANOTHER dictionary that holds the sockets as soon as they are created? 3) What's the best way of finding if clients are no longer connected? We've read some many methods but we're not sure of the best one to use, send data or read data, if so how? 4) If we loop through the connections dictonary to check for disposed clients, should we be locking the dictionary, if so how does this affect other clients objects trying to use it at the same time, will it throw an error or just wait? 5) We often get disposedSocketException within ReceiveCallBack method at random times, does this mean we are safe to remove that socket from the collection? We can't seem to find any production type examples which show any of this working. Any advice would be greatly received

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  • Objective-c - How to serialize audio file into small packets that can be played?

    - by vfn
    Hi there, So, I would like to get a sound file and convert it in packets, and send it to another computer. I would like that the other computer be able to play the packets as they arrive. I am using AVAudioPlayer to try to play this packets, but I couldn't find a proper way to serialize the data on the peer1 that the peer2 can play. The scenario is, peer1 has a audio file, split the audio file in many small packets, put them on a NSData and send them to peer2. Peer 2 receive the packets and play one by one, as they arrive. Does anyone have know how to do this? or even if it is possible? EDIT: Here it is some piece of code to illustrate what I would like to achieve. // This code is part of the peer1, the one who sends the data - (void)sendData { int packetId = 0; NSString *soundFilePath = [[NSBundle mainBundle] pathForResource:@"myAudioFile" ofType:@"wav"]; NSData *soundData = [[NSData alloc] initWithContentsOfFile:soundFilePath]; NSMutableArray *arraySoundData = [[NSMutableArray alloc] init]; // Spliting the audio in 2 pieces // This is only an illustration // The idea is to split the data into multiple pieces // dependin on the size of the file to be sent NSRange soundRange; soundRange.length = [soundData length]/2; soundRange.location = 0; [arraySoundData addObject:[soundData subdataWithRange:soundRange]]; soundRange.length = [soundData length]/2; soundRange.location = [soundData length]/2; [arraySoundData addObject:[soundData subdataWithRange:soundRange]]; for (int i=0; i // This is the code on peer2 that would receive an play the piece of audio on each packet - (void) receiveData:(NSData *)data { NSKeyedUnarchiver* unarchiver = [[NSKeyedUnarchiver alloc] initForReadingWithData:data]; if ([unarchiver containsValueForKey:PACKET_ID]) NSLog(@"DECODED PACKET_ID: %i", [unarchiver decodeIntForKey:PACKET_ID]); if ([unarchiver containsValueForKey:PACKET_SOUND_DATA]) { NSLog(@"DECODED sound"); NSData *sound = (NSData *)[unarchiver decodeObjectForKey:PACKET_SOUND_DATA]; if (sound == nil) { NSLog(@"sound is nil!"); } else { NSLog(@"sound is not nil!"); AVAudioPlayer *audioPlayer = [AVAudioPlayer alloc]; if ([audioPlayer initWithData:sound error:nil]) { [audioPlayer prepareToPlay]; [audioPlayer play]; } else { [audioPlayer release]; NSLog(@"Player couldn't load data"); } } } [unarchiver release]; } So, here is what I am trying to achieve...so, what I really need to know is how to create the packets, so peer2 can play the audio. It would be a kind of streaming. Yes, for now I am not worried about the order that the packet are received or played...I only need to get the sound sliced and them be able to play each piece, each slice, without need to wait for the whole file be received by peer2. Thanks!

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  • Faster bulk inserts in sqlite3?

    - by scubabbl
    I have a file of about 30000 lines of data I want to load into a sqlite3 database. Is there a faster way that generating insert statements for each line of data? The data is space delimited and maps directly to the sqlite3 table. Is there any sort of bulk insert method for adding volume data to a database? Has anyone devised some deviously wonderful way of doing this if it's not built in? I should preface this by asking is there a c++ way to do it from the API? Thanks.

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  • Progress Bar restarts

    - by Rishi Kasnia
    I have a DataGrid and in the Data Template of a DataGridTemplateColumn, i have added a Progress bar. now every time when mouse overs the rows of the data grid. my progress bar restarts its value from 0. I actually changes the Background and border property of the Row from triggers which i have defined in the control template of the Data Grid. Any Suggestions...

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  • How to determine if DataGridView contains uncommitted changes when bound to a SqlDataAdapter

    - by JYelton
    I have a form which contains a DataGridView, a BindingSource, a DataTable, and a SqlDataAdapter. I populate the grid and data bindings as follows: private BindingSource bindingSource = new BindingSource(); private DataTable table = new DataTable(); private SqlDataAdapter dataAdapter = new SqlDataAdapter("SELECT * FROM table ORDER BY id ASC;", ClassSql.SqlConn()); private void LoadData() { table.Clear(); dataGridView1.AutoGenerateColumns = false; dataGridView1.DataSource = bindingSource; SqlCommandBuilder commandBuilder = new SqlCommandBuilder(dataAdapter); table.Locale = System.Globalization.CultureInfo.InvariantCulture; dataAdapter.Fill(table); bindingSource.DataSource = table; } The user can then make changes to the data, and commit those changes or discard them by clicking either a save or cancel button, respectively. private void btnSave_Click(object sender, EventArgs e) { // save everything to the displays table dataAdapter.Update(table); } private void btnCancel_Click(object sender, EventArgs e) { // alert user if unsaved changes, otherwise close form } I would like to add a dialog if cancel is clicked that warns the user of unsaved changes, if unsaved changes exist. Question: How can I determine if the user has modified data in the DataGridView but not committed it to the database? Is there an easy way to compare the current DataGridView data to the last-retrieved query? (Note that there would not be any other threads or users altering data in SQL at the same time.)

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  • all rows plus min / max values using a single stored procedure

    - by Rajeev
    I have a custom data source which pulls out data form a flat file. The flat file contains a timestamp , source and data. I can use sp_execute to execute a select query against the flat file. I'm currently using 2 stored procedures . - one which runs a select * from flat_file into a temp table - the other which does a select min/max from flat_file grouping by source into another temp file Im using the data retrieved using the stored procedures in a SSRS report Is is possible in a a single stored procedure to retrieve all the rows from the file within a date range and also identify the min/max values for each group retrieved ?e

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  • how python http request and response works

    - by Apache
    hi expert, i'm newbie for python, i use to learn using sample, i use python to scan wifi to get ssid, and now i want to send the data to the server, then i did as follow import httplib,urllib params = urllib.urlencode({"ssid":"guest"}) headers = {"Content-type":"application/x-www-form-urlencoded","Accept":"text/plain"} conn=httplib.HTTPConnection("http://223.56.124.58:8080/wireless") conn.request("POST","data",params,headers) response = conn.getresponse() print "Response" print response.status print "-----" print response.reason data = response.read() print data conn.close() but when execute the code i'm getting as follow root@dave-laptop:~# python http.py Traceback (most recent call last): File "http.py", line 9, in conn.request("POST","http://202.45.139.58:8080/ppod-web",params,headers) File "/usr/lib/python2.6/httplib.py", line 898, in request self._send_request(method, url, body, headers) File "/usr/lib/python2.6/httplib.py", line 935, in _send_request self.endheaders() File "/usr/lib/python2.6/httplib.py", line 892, in endheaders self._send_output() File "/usr/lib/python2.6/httplib.py", line 764, in _send_output self.send(msg) File "/usr/lib/python2.6/httplib.py", line 723, in send self.connect() File "/usr/lib/python2.6/httplib.py", line 704, in connect self.timeout) File "/usr/lib/python2.6/socket.py", line 500, in create_connection for res in getaddrinfo(host, port, 0, SOCK_STREAM): socket.gaierror: [Errno -2] Name or service not known can anyone help me the code should be like this when rum in the url http://223.56.124.58:8080/wireless?data={"wifi":{"ssid":"guest","rssi","80"}} how to set like this or other way to do this to send to the server thanks

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  • ajax error when calling from javascript

    - by vikitor
    Hi, I' still newby to this so I'll try to explain what I'm doing. Basically what I want is to load a dropdownlist depending on the value of a previous one, and I want it to load the data and appear when the other one is changed. This is the code I've written in my controller: public ActionResult GetClassesSearch(bool ajax, string phylumID, string kingdom){ IList<TaxClass> lists = null; int _phylumID = int.Parse(phylumID); int _kingdom = int.Parse(kingdom); lists = _taxon.getClassByPhylumSearch(_phylumID, _kingdom); return Json(lists); } and this is how I call the method from the javascript function: function loadClasses(_phylum) { var phylum = _phylum.value; $.getJSON("/Suspension/GetClassesSearch", { ajax: true, classID: phylum, kingdom: kingdom }, }, function(data) { $('#sClass').attr("disabled", true); $('#sClass').selectOptions("-2"); $('#sClass').removeOption(/./); var values = ''; $('#sClass').addOption("-2", "-Select All-"); for (i = 0; i < data.length; i++) { $('#sClass').addOption(data[i].RecId, data[i].TaxonName); } $('#sClass').selectOptions("-2"); $('#sClass').removeAttr("disabled"); }); } I can't get it to work. Any tips? Thanks in advance

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  • PHP: Convert curl_exec output to UTF8

    - by Paul Tarjan
    I would like to only work with UTF8. The problem is I don't know the charset of every webpage. How can I detect it and convert to UTF8? <?php $url = "http://vkontakte.ru"; $ch = curl_init($url); $options = array( CURLOPT_RETURNTRANSFER => true, ); curl_setopt_array($ch, $options); $data = curl_exec($ch); // $data = magic($data); print $data; See this at: http://paulisageek.com/tmp/curl-utf8 What is magic()?

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  • ListView: convertView / holder getting confused

    - by Steve H
    I'm working with a ListView, trying to get the convertView / referenceHolder optimisation to work properly but it's giving me trouble. (This is the system where you store the R.id.xxx pointers in as a tag for each View to avoid having to call findViewById). I have a ListView populated with simple rows of an ImageView and some text, but the ImageView can be formatted either for portrait-sized images (tall and narrow) or landscape-sized images (short and wide). It's adjusting this formatting for each row which isn't working as I had hoped. The basic system is that to begin with, it inflates the layout for each row and sets the ImageView's settings based on the data, and includes an int denoting the orientation in the tag containing the R.id.xxx values. Then when it starts reusing convertViews, it checks this saved orientation against the orientation of the new row. The theory then is that if the orientation is the same, then the ImageView should already be set up correctly. If it isn't, then it sets the parameters for the ImageView as appropriate and updates the tag. However, I found that it was somehow getting confused; sometimes the tag would get out of sync with the orientation of the ImageView. For example, the tag would still say portrait, but the actual ImageView would still be in landscape layout. I couldn't find a pattern to how or when this happened; it wasn't consistent by orientation, position in the list or speed of scrolling. I can solve the problem by simply removing the check about convertView's orientation and simply always set the ImageView's parameters, but that seems to defeat the purpose of this optimisation. Can anyone see what I've done wrong in the code below? static LinearLayout.LayoutParams layoutParams; (...) public View getView(int position, View convertView, ViewGroup parent){ ReferenceHolder holder; if (convertView == null){ convertView = inflater.inflate(R.layout.pick_image_row, null); holder = new ReferenceHolder(); holder.getIdsAndSetTag(convertView, position); if (data[position][ORIENTATION] == LANDSCAPE) { // Layout defaults to portrait settings, so ImageView size needs adjusting. // layoutParams is modified here, with specific values for width, height, margins etc holder.image.setLayoutParams(layoutParams); } holder.orientation = data[position][ORIENTATION]; } else { holder = (ReferenceHolder) convertView.getTag(); if (holder.orientation != data[position][ORIENTATION]){ //This is the key if statement for my question switch (image[position][ORIENTATION]) { case PORTRAIT: // layoutParams is reset to the Portrait settings holder.orientation = data[position][ORIENTATION]; break; case LANDSCAPE: // layoutParams is reset to the Landscape settings holder.orientation = data[position][ORIENTATION]; break; } holder.image.setLayoutParams(layoutParams); } } // and the row's image and text is set here, using holder.image.xxx // and holder.text.xxx return convertView; } static class ReferenceHolder { ImageView image; TextView text; int orientation; void getIdsAndSetTag(View v, int position){ image = (ImageView) v.findViewById(R.id.pickImageImage); text = (TextView) v.findViewById(R.id.pickImageText); orientation = data[position][ORIENTATION]; v.setTag(this); } } Thanks!

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  • form update too expensive to be executed in Winform.Timer.Tick

    - by Abruzzo Forte e Gentile
    Hi all I have a WinForm drawing a chart from available data. I programmed it so that every 1 secong the Winform.Timer.Tick event calls a function that: will dequeue all data available will add new points on the chart Right now data to be plotted is really huge and it takes a lot of time to be executed so to update my form. Also Winform.Timer.Tick relies on WM_TIMER , so it executes in the same thread of the Form. Theses 2 things are making my form very UNresponsive. What can I do to solve this issue? I thought the following: moving away from usage of Winform.Timer and start using a System.Threading.Timer use the IsInvokeRequired pattern so I will rely on the .NET ThreadPool. Since I have lots of data, is this a good idea? I have fear that at some point also the ThreadPool will be too long or too big. Can you give me your suggestion about my issue? Thank you very much! AFG

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  • Populate InfoPath Combo Box

    - by fwm
    I am trying to populate a drop down and found this page, which provides part of the solution: http://www.bizsupportonline.net/infopath2007/programmatically-fill-populate-drop-down-list-box-infopath-2007.htm I got this to work, but if players.xml was changed, the drop down list didn't reflect it. I had to rename the file and add the new file as my secondary data source to see the change. For my purposes, the xml file that is used to populate the drop down box would need to be created anew. Each time the form is loaded, I programatically create a new xml file, but the drop down doesn't pick up the new file, even though I have named it as the secondary data source. It seems that once you set a file to be your secondary data source, it takes a snapshot of that file at the time the source was added as a secondary data source and if you change the file, you must rename and add it as your secondary source. How do I populate a drop down box from an XML file such that if the XML file changes, the contents of the drop down change accordingly?

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