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Websockify to wrap a forking server

- by Gurjeet Singh

I came across Websockify [1] and the accompanying Websock client-side javascript library. AIUI from the Wrap a Programsection in README, Websockify can help you launch a TCP server and rebind its port so that incoming Websockets-based communication is parsed and forwarded to the server on the proper (rebinded) port. My question is, can this mechanism be used to wrap a server that forks its children which in turn communicate with the client on a different port. Specifically, I am interested in websockifying a Postgres server, which typically listens on port 5432 and for a new incoming connection it forks a child which serves all future request from that client. (If it helps, Oracle RDBMS and many other servers, RDBMS or not, also use similar method.) [1] https://github.com/kanaka/websockify

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How to set focus for CustCombBox in a CellEditingTemplate when entering page at the first time(MVVM

- by Shamin

PreparingCellForEdit="dg_PreparingCellForEdit" BeginningEdit="dg_BeginningEdit" <data:DataGridTemplateColumn MinWidth="300"> <data:DataGridTemplateColumn.HeaderStyle> <Style TargetType="primitives:DataGridColumnHeader" BasedOn="{StaticResource FOTDataGridColumnHeaderStyle}"> <Setter Property="ContentTemplate"> <Setter.Value> <DataTemplate> <TextBlock Text="{Binding CancelReasonText2,Source={StaticResource LabelResource}}" Style="{StaticResource TextBlockLabelStandardStyle}"/> </DataTemplate> </Setter.Value> </Setter> </Style> </data:DataGridTemplateColumn.HeaderStyle> <data:DataGridTemplateColumn.CellTemplate> <DataTemplate> <TextBlock Text="{Binding CancelReason.CancelCodeDescription}" Style="{StaticResource TextBlockLabelStandardStyle}"/> </DataTemplate> </data:DataGridTemplateColumn.CellTemplate> <data:DataGridTemplateColumn.CellEditingTemplate> <DataTemplate> <input:AutoCompleteBox x:Name="cBoxCancelReason" FilterMode="StartsWith" IsDropDownOpen="True" SelectedItem="{Binding CancelReason, Mode=TwoWay}" ItemsSource="{Binding CancelCodes}" ValueMemberPath="CancelCodeDescription" > <input:AutoCompleteBox.ItemTemplate> <DataTemplate> <TextBlock Text="{Binding CancelCodeDescription}" Style="{StaticResource TextBlockLabelStandardStyle}"/> </DataTemplate> </input:AutoCompleteBox.ItemTemplate> </input:AutoCompleteBox> </DataTemplate> </data:DataGridTemplateColumn.CellEditingTemplate> </data:DataGridTemplateColumn> </data:DataGrid.Columns> </data:DataGrid> ---CodeBind public partial class CancelFlightView : UserControl,ICancelFlightView { private data.CancelCode DefaultCancelCode { get { data.CancelCode code = new data.CancelCode(); code.CancelCd = "-1"; code.CancelCodeDescription = "-- Select Cancel Reason --"; return code; } } public CancelFlightView() { InitializeComponent(); this.dg.LoadingRow += new EventHandler<DataGridRowEventArgs>(dg_LoadingRow); //this.Loaded += new RoutedEventHandler(CancelFlightView_Loaded); } void dg_LoadingRow(object sender, DataGridRowEventArgs e) { CheckBox checkBox = (CheckBox)dg.Columns[0].GetCellContent(e.Row); if (checkBox.IsChecked.Value) { FrameworkElement obj = (FrameworkElement)dg.Columns[1].GetCellContent(e.Row); System.Windows.Browser.HtmlPage.Plugin.Focus(); DataGridCell cellEdit = (DataGridCell)obj.Parent; cellEdit.Focus(); dg.BeginEdit(); } } //private void UserControl_Loaded(object sender, RoutedEventArgs e) //{ // if (DataContext != null) // { // CancelFlightViewModel viewModel = (CancelFlightViewModel)DataContext; // viewModel.View = this; // viewModel.Grid = dg; // //viewModel.InitFocus(); // } //} //void CancelFlightView_Loaded(object sender, RoutedEventArgs e) //{ // if (dg.SelectedItem != null) // { // CheckBox checkBox = (CheckBox)dg.Columns[0].GetCellContent(dg.SelectedItem); // if (checkBox.IsChecked.Value) // { // DataGridCell cellEdit = ((DataGridCell)((System.Windows.Controls.Primitives.DataGridCellsPresenter)((DataGridCell)checkBox.Parent).Parent).Children[1]); // dg.CurrentColumn = dg.Columns[1]; // System.Windows.Browser.HtmlPage.Plugin.Focus(); // cellEdit.Focus(); // dg.BeginEdit(); // } // } //} public CancelFlightView(CancelFlightViewModel viewModel):this() { ViewModel = viewModel; } private void dg_PreparingCellForEdit(object sender, DataGridPreparingCellForEditEventArgs e) { object obj = dg.Columns[1].GetCellContent(e.Row); if (obj != null && obj.GetType() == typeof(AutoCompleteBox)) { AutoCompleteBox cBoxCancelReason = (AutoCompleteBox)obj; System.Windows.Browser.HtmlPage.Plugin.Focus(); cBoxCancelReason.Focus(); } } private void CustomComboBox_SelectionChanged(object sender, SelectionChangedEventArgs e) { } private void dg_BeginningEdit(object sender, DataGridBeginningEditEventArgs e) { } private void chkFlight_Click(object sender, RoutedEventArgs e) { CheckBox chkTemp = sender as CheckBox; if (!chkTemp.IsChecked.Value) { } else { DataGridCell cellEdit = ((DataGridCell)((System.Windows.Controls.Primitives.DataGridCellsPresenter)((DataGridCell)chkTemp.Parent).Parent).Children[1]); dg.CurrentColumn = dg.Columns[1]; cellEdit.Focus(); dg.BeginEdit(); } } private void LayoutRoot_KeyUp(object sender, KeyEventArgs e) { //if (e.Key == Key.Enter) //{ //} } #region ICancelFlightView Members public CancelFlightViewModel ViewModel { get { return DataContext as CancelFlightViewModel; } set { DataContext = value; } } #endregion } Now, when user click CheckBox, I can set focus on CustCombBox, but I can't set focus on Whose checkBox.IsChecked.Value = true when page is opened for the first time. is it possible on MVVM pattern? Looking forward your reply, thanks very much.

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How to get default Ctrl+Tab functionality in WinForms MDI app when hosting WPF UserControls

- by jpierson

I have a WinForms based app with traditional MDI implementation within it except that I'm hosting WPF based UserControls via the ElementHost control as the main content for each of my MDI children. This is the solution recommended by Microsoft for achieving MDI with WPF although there are various side effects unfortunately. One of which is that my Ctrl+Tab functionality for tab switching between each MDI child is gone because the tab key seems to be swallowed up by the WPF controls. Is there a simple solution to this that will let the Ctrl+tab key sequences reach my WinForms MDI parent so that I can get the built-in tab switching functionality?

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Custom styled select box

- by Ivan

Hi to all am trying to use javascript for custom styled select boxes from www.gerrendesign.com/entry_images/selectboxdemo.zip and as I have plenty entries inside one of select box I need to make but am stuck in creation of scrolling function. As this select boxes are compatible with almost all older and new browsers. I need only suggestion or solution how to add scroll in this linked/attached files above - if select box is populated with plenty of entries (example cities, states, or exchange rates...) Am stuck here... Thanks for your cooperation Ivan THIS IS CODE: $(document).ready(function(){ // first locate all of the select tags on the page and hide them $("select.changeMe").css('display','none'); //now, for each select box, run this function $("select.changeMe").each(function(){ var curSel = $(this); // get the CSS width from the original select box var gddWidth = $(curSel).css('width'); var gddWidthL = gddWidth.slice(0,-2); var gddWidth2 = gddWidthL - 28; var gddWidth3 = gddWidthL - 16; // build the new div structure var gddTop = '<div style="width:' + gddWidthL + 'px" class="selectME" tabindex="0"><div class="cornerstop"><div><div></div></div></div><div class="middle"><div><div><div>'; //get the default selected option var whatSelected = $(curSel).children('option:selected').text(); //write the default var gddFirst = '<div class="first"><span class="selectME gselected" style="width:'+ gddWidth2 + 'px;">'+ whatSelected +'</span><span id="arrowImg"></span><div class="clears"></div></div><ul class="selectME">'; // create a new array of div options from the original's options var addItems = new Array(); $(curSel).children('option').each( function() { var text = $(this).text(); var selVal = $(this).attr('value'); var before = '<li style="width:' + gddWidthL + 'px;"><a href="#" rel="' + selVal + '" tabindex="0" style="width:' + gddWidth3 + 'px;">'; var after = '</a></li>'; addItems.push(before + text + after); }); //hide the default from the list of options var removeFirst = addItems.shift(); // create the end of the div selectbox and close everything off var gddBottom ='</ul></div></div></div></div><div class="cornersbottom"><div><div></div></div></div></div>' //write everything after each selectbox var GDD = gddTop + gddFirst + addItems.join('') + gddBottom; $(curSel).after(GDD); //this var selects the div select box directly after each of the origials var nGDD = $(curSel).next('div.selectME'); $(nGDD).find('li:first').addClass("first"); $(nGDD).find('li:last').addClass('last'); //handle the on click functions - push results back to old text box $(nGDD).click( function(e) { var myTarA = $(e.target).attr('rel'); var myTarT = $(e.target).text(); var myTar = $(e.target); //if closed, then open if( $(nGDD).find('li').css('display') == 'none') { //this next line closes any other selectboxes that might be open $('div.selectME').find('li').css('display','none'); $(nGDD).find('li').css('display','block'); //if user clicks off of the div select box, then shut the whole thing down $(document.window || 'body').click( function(f) { var myTar2 = $(f.target); if (myTar2 !== nGDD) {$(nGDD).find('li').css('display','none');} }); return false; } else { if (myTarA == null){ $(nGDD).find('li').css('display','none'); return false; } else { //set the value of the old select box $(curSel).val(myTarA); //set the text of the new one $(nGDD).find('span.gselected').text(myTarT); $(nGDD).find('li').css('display','none'); return false; } } //handle the tab index functions }).focus( function(e) { $(nGDD).find('li:first').addClass('currentDD'); $(nGDD).find('li:last').addClass('lastDD'); function checkKey(e){ //on keypress handle functions function moveDown() { var current = $(nGDD).find('.currentDD:first'); var next = $(nGDD).find('.currentDD').next(); if ($(current).is('.lastDD')){ return false; } else { $(next).addClass('currentDD'); $(current).removeClass('currentDD'); } } function moveUp() { var current = $(nGDD).find('.currentDD:first'); var prev = $(nGDD).find('.currentDD').prev(); if ($(current).is('.first')){ return false; } else { $(prev).addClass('currentDD'); $(current).removeClass('currentDD'); } } var curText = $(nGDD).find('.currentDD:first').text(); var curVal = $(nGDD).find('.currentDD:first a').attr('rel'); switch (e.keyCode) { case 40: $(curSel).val(curVal); $(nGDD).find('span.gselected').text(curText); moveDown(); return false; break; case 38: $(curSel).val(curVal); $(nGDD).find('span.gselected').text(curText); moveUp(); return false; break; case 13: $(nGDD).find('li').css('display','none'); } } $(document).keydown(checkKey); }).blur( function() { $(document).unbind('keydown'); }); }); });

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Prevent SQL injection from form-generated SQL - NO PreparedStmts

- by Markos Fragkakis

Hi all, I have a search table where user will be able to filter results with a filter of the type: Field [Name], Value [John], Remove Rule Field [Surname], Value [Blake], Remove Rule Field [Has Children], Value [Yes], Remove Rule Add Rule So the user will be able to set an arbitrary set of filters, which will result essentially in a completely dynamic WHERE clause. In the future I will also have to implement more complicated logical expressions, like Where (name=John OR name=Nick) AND (surname=Blake OR surname=Bourne), Of all 10 fields the user may or may not filter by, I don't know how many and which filters the user will set. So, I cannot use a prepared statement (which assumes that at least we know the fields in the WHERE clause). This is why prepared statements are unfortunately out of the question, I have to do it with plain old, generated SQL. What measures can I take to protect the application from SQL Injection (REGEX-wise or any other way)?

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How do the young start programming nowadays

- by PP

Back in the late 80s/early 90s I learned GWBasic on MS-DOS. Then Turbo Pascal. Then Turbo C/Asm. Later I stumbled into PHP and finally made a career out of Perl programming. I'm curious how actual under-25s found their way into programming. There is a lot of discussion about what path you would steer your children if you wanted them to learn programming, but I would like to hear from the newer generation to find out their more modern experiences about becoming a programmer. Note: no stories from people who first discovered programming at university.

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HQL recursion, how do I do this?

- by niklassaers

Hi guys, I have a tree structure where each Node has a parent and a Set<Node> children. Each Node has a String title, and I want to make a query where I select Set<String> titles, being the title of this node and of all parent nodes. How do I write this query? The query for a single title is this, but like I said, I'd like it expanded for the entire branch of parents. SELECT node.title FROM Node node WHERE node.id = :id Cheers Nik

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How do you draw a line on a canvas in WPF that is 1 pixel thick.

- by xarzu

The method for drawing a line on a canvas in WPF that uses the line class actually draws a line that is two pixels thick: Line myLine = new Line(); myLine.Stroke = System.Windows.Media.Brushes.Black; myLine.X1 = 100; myLine.X2 = 140; // 150 too far myLine.Y1 = 200; myLine.Y2 = 200; myLine.StrokeThickness = 1; graphSurface.Children.Add(myLine); Microsoft might have decided to set a standard for line thickness and the minimum is 2 pixels thick when you set the strockThickness to 1, but when you already have rectangles drawn in XAML and even error fonts using WingDings, it is an obvious miss-match. How do you draw a line that is truly 1 pixel thick?

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treeview and postback

- by Luis

hi I have a treeview, and already the javascript code to postback the page. Because when i select the father , auto-select the children. this is my html code <script> function foo() { var o = window.event.srcElement; if (o.tagName == "INPUT" && o.type == "checkbox") { __doPostBack("",""); } } </script> <asp:TreeView ID="HierarchicalTreeView" runat="server" OnSelectedNodeChanged="HierarchicalTreeView_SelectedNodeChanged" ShowLines="True" ExpandImageToolTip="Fechar "{0}"" CollapseImageToolTip="Fechar "{0}"" ExpandDepth="1" OnTreeNodeCheckChanged="HierarchicalTreeView_TreeNodeCheckChanged" EnableClientScripts="true" onClick="foo()"> <NodeStyle CssClass="text" /> <SelectedNodeStyle CssClass="text" Font-Bold="true" /> </asp:TreeView> How can i prevent from postback all page, and only the treeview???, so dont 'refresh' the page

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Regular Expression Fill-Down

- by richardtallent

I have a plain text file something like this: Ford\tTaurus F-150 F-250 Toyota\tCamry Corsica In other words, a two-level hierarchy where the first child is on the same line as the parent, but subsequent children on lines following, distinguished from being a parent by a two-space prefix (\t above represents a literal tab in the text). I need to convert to this using RegEx: Ford\tTaurus Ford\tF-150 Ford\tF-250 Toyota\tCamry Toyota\tCorsica So, I need to capture the parent (text between \r\n and \t not starting with \s\s), and apply that in the middle of any \r\n\s\s found until the next parent. I have a feeling this can be done with some sort of nested groups, but I think I need more caffeine or something, can't seem to work out the pattern. (Using .NET with IgnoreWhitespace off and Multiline off)

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MessageBox doesn't show on mdi form after a long calculation

- by Rekreativc

Hello This is a very similar problem to This one, sadly that one was never answered either. I have a MDI Main forum that hosts several children forms. One of them does a long calculation and throws an exception if an error occurs (all work is done on the same thread). I then try to inform the user of an error with an messagebox, however it doesn't appear (but steals focus from the MDI Main, so the application is completely unresponsive). The beheviour changes slightly if I call Application.DoEvents() (evil I know, but this is a last resort thing). Then the forms remain completely active and the messagebox only appears after I change active application (Alt+Tab) to something else and then back again. What can I do to make sure the messagebox will be visible? I have already tried passing both, active child and MDI Main as parameter to the MessageBox.Show method. It doesn't change the behaviour.

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Fail to profile remote java app using TPTP

- by rperez

Hi all, I am trying to profile CPU usage using TPTP. Application to profile run on Linux RH AS5. I installed and configured Agent Controller like described here I ran the java application using the command java '-agentlib:JPIBootLoader=JPIAgent:server=standalone,file=log.trcxml;CGProf' MyApp The monitoring station is All-In-one TPTP version 4.6.2. I followed the stepes described here on Eclipse - on the "Profile Configuration" I choose a new configuration for "Attach to Agent", set the host to my remote linux machine where MyApp is running, test connection succeed and when I get to the "Agents" tab, I see "Pending...", a background process "Feching children for host" is running and can't find anything which makes it impossible to profile. Any idea?

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Bound Command not firing on another viewModel? What Am I doing wrong?

- by devnet247

Hi I cannot seem to bind a command to a button.I have a treeview on the left showing Country City etc.. And I tabcontrol on the right. do I This uses 4 viewModels rootviewModel-ContinentViewModel-CountryViewModel-CityViewModel What I am building is based on http://www.codeproject.com/KB/WPF/TreeViewWithViewModel.aspx Now on one of the tabs I have a Toolbar with a button "TestButton" that I have mapped in zaml. This does not fire! The reason is not firing is because I m binding the RootViewModel but the command that is bound in zaml is in the cityViewModel. How Do I pass the datacontext from one view to the other? or how do I make the button fire. I need the command to be in the cityViewModel. Any Suggestions on how I bind it? View "WorldExplorerView" where I bind the main DataContext public partial class WorldExplorerView { public WorldExplorerView() { InitializeComponent(); var continents = Database.GetContinents(); var rootViewModel = new RootViewModel(continents); DataContext = rootViewModel; } } CityViewModel public class CityViewModel : TreeViewItemViewModel { private City _city; private RelayCommand _testCommand; public CityViewModel(City city, CountryViewModel countryViewModel):base(countryViewModel,false) { _city = city; } Properties etc...... public ICommand TestCommand { get { if(_testCommand==null) { _testCommand = new RelayCommand(param => GetTestCommand(), param => CanCallTestCommand); ; } return _testCommand; } } protected bool CanCallTestCommand { get { return true; } } private static void GetTestCommand() { MessageBox.Show("It works"); } } ZAML <DockPanel> <DockPanel LastChildFill="True"> <Label DockPanel.Dock="top" Content="Title " HorizontalAlignment="Center"></Label> <StatusBar DockPanel.Dock="Bottom"> <StatusBarItem Content="Status Bar" ></StatusBarItem> </StatusBar> <Grid DockPanel.Dock="Top"> <Grid.ColumnDefinitions> <ColumnDefinition/> <ColumnDefinition Width="Auto"/> <ColumnDefinition Width="2*"/> </Grid.ColumnDefinitions> <TreeView Name="tree" ItemsSource="{Binding Continents}"> <TreeView.ItemContainerStyle> <Style TargetType="{x:Type TreeViewItem}"> <Setter Property="IsExpanded" Value="{Binding IsExpanded,Mode=TwoWay}"/> <Setter Property="IsSelected" Value="{Binding IsSelected,Mode=TwoWay}"/> <Setter Property="FontWeight" Value="Normal"/> <Style.Triggers> <Trigger Property="IsSelected" Value="True"> <Setter Property="FontWeight" Value="Bold"></Setter> </Trigger> </Style.Triggers> </Style> </TreeView.ItemContainerStyle> <TreeView.Resources> <HierarchicalDataTemplate DataType="{x:Type ViewModels:ContinentViewModel}" ItemsSource="{Binding Children}"> <StackPanel Orientation="Horizontal"> <Image Width="16" Height="16" Margin="3,0" Source="Images\Continent.png"/> <TextBlock Text="{Binding ContinentName}"/> </StackPanel> </HierarchicalDataTemplate> <HierarchicalDataTemplate DataType="{x:Type ViewModels:CountryViewModel}" ItemsSource="{Binding Children}"> <StackPanel Orientation="Horizontal"> <Image Width="16" Height="16" Margin="3,0" Source="Images\Country.png"/> <TextBlock Text="{Binding CountryName}"/> </StackPanel> </HierarchicalDataTemplate> <DataTemplate DataType="{x:Type ViewModels:CityViewModel}" > <StackPanel Orientation="Horizontal"> <Image Width="16" Height="16" Margin="3,0" Source="Images\City.png"/> <TextBlock Text="{Binding CityName}"/> </StackPanel> </DataTemplate> </TreeView.Resources> </TreeView> <GridSplitter Grid.Row="0" Grid.Column="1" Background="LightGray" Width="5" HorizontalAlignment="Stretch" VerticalAlignment="Stretch"/> <Grid Grid.Column="2" Margin="5" > <TabControl> <TabItem Header="Demo"> <DockPanel LastChildFill="True"> <ToolBar DockPanel.Dock="Top">  <Button Name="btnTest" Command="{Binding TestCommand}" Content="Press me see if works"></Button> </ToolBar> <TextBox></TextBox> </DockPanel> </TabItem> <TabItem Header="Details" DataContext="{Binding Path=SelectedItem.City, ElementName=tree, Mode=OneWay}"> <StackPanel > <TextBlock VerticalAlignment="Center" FontSize="12" Text="{Binding CityName}"/> <TextBlock VerticalAlignment="Center" FontSize="12" Text="{Binding Area}"/> <TextBlock VerticalAlignment="Center" FontSize="12" Text="{Binding Population}"/> <TextBlock VerticalAlignment="Center" FontSize="12" Text="{Binding CityDetailsInfo.ClubsCount}"/> <TextBlock VerticalAlignment="Center" FontSize="12" Text="{Binding CityDetailsInfo.PubsCount}"/> </StackPanel> </TabItem> </TabControl> </Grid> </Grid> </DockPanel> </DockPanel>

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Recursive TreeView in ASP.NET

- by waqasahmed

I have an object of type list from which I wish to use to populate a treeview in asp.net c#. Each object item has: id | Name | ParentId so for example: id | Name | ParentId ------------------------- 1 | Alice | 0 2 | Bob | 1 3 | Charlie | 1 4 | David | 2 In the above example, the parent would be Alice having two children Bob and Charlie. David is the child of Bob. I have had many problems trying to dynamically populate the treeview recursively in c# ASP.NET Does any one have a simple solution? Btw: you can use People.Id, People.Name and People.ParentId to access the members since it is an object belonging to list. I can post you my code so far (many attempts made) but not sure how useful it will be.

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3D Triangle - WPF

- by user300423

I am trying to apply an image brush to a Triangle in WPF without success. What am i doing wrong? This is my attempt: Dim ModelTri As New MeshGeometry3D ModelTri.Positions.Add(New Point3D(0, 0, 0)) ModelTri.Positions.Add(New Point3D(100, 0, 0)) ModelTri.Positions.Add(New Point3D(100, 100, 0)) Dim MeshTri As New MeshGeometry3D MeshTri.TriangleIndices.Add(0) MeshTri.TriangleIndices.Add(1) MeshTri.TriangleIndices.Add(2) 'Texture Dim TexturePoints As New PointCollection TexturePoints.Add(New Point(100, 0)) TexturePoints.Add(New Point(0, 100)) TexturePoints.Add(New Point(100, 100)) MeshTri.TextureCoordinates = TexturePoints 'Image Brush Dim imgBrush As New ImageBrush() imgBrush.ImageSource = New BitmapImage(New Uri("Mercury.jpg", UriKind.Relative)) imgBrush.Stretch = Stretch.Fill imgBrush.TileMode = TileMode.Tile imgBrush.SetValue(NameProperty, "imgBrush") Dim Mat As Material Dim DMaterial As New DiffuseMaterial DMaterial.Brush = imgBrush Dim Bind As New Binding("imgBrush") Bind.Source = imgBrush BindingOperations.SetBinding(DMaterial, BindingGroupProperty, Bind) 'This doesnt work Mat = DMaterial 'This works 'Mat = New DiffuseMaterial(New SolidColorBrush(Colors.Khaki)) Dim triangleModel As GeometryModel3D = New GeometryModel3D(ModelTri, Mat) Dim model As New ModelVisual3D() model.Content = triangleModel Viewport.Children.Add(model)

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adding to json property that may or may not exist yet

- by mmcgrail

let say i want to do this var dasboard = {}; $('.check').click(function(){ $(this).toggleClass("active").siblings().slideToggle('slow', function() { dashboard['pages']['pagename'][$(this).closest('li').attr("id")]['show'] = $(this).is(":hidden") ? 'collapsed' : 'expanded'; }); } i get an error saying 'dashboard.pages is undefined' is there away to dynamically add 'pages' and the children that follow without having to do the work of checking to see if it is defined first then if its not doing dashboard['pages'] = {}; because sometimes they may already exist and I don't want to have to inspect the tree first i just want to build the branches as needed

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How can I use a TreeWalker to dump out the DOM

- by michael

Hi, In w3c dom interface, there is DOMTreeWalker to traverse the DOM. I find this example which uses DOMTreeWalker: http://www.java-tips.org/java-se-tips/org.w3c.dom/how-to-traverse-the-dom-tree-using-treewalker-2.html But my question is How can I use the DOMTreeWalk to dump the dom structure and value to a file? i.e. I need to know when a parent start and a parent end so that I can do when I dump the dom to a file (i need to insert after each parent dumps its children: <parent> <child a1="1" a2="2"/> <child a3="1" a4="3"/> <child a5="1" a6="5"/> </parent>

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STAThread and Process output capture in c#

- by alex

Hi: This is a strange problem I encountered. I have an window application written in c# to do testing. It has a MDI parent form that is hosting a few children forms. One of the forms launch test cripts by creating processes and capture the scripts output to a text box. Another form open serial port and monitoring the status of the device I am working on(like a shell). If I ran both of them together, the output of the script seems only appear in the text box after the test is done. However, If I don't open the serial port form, the output of the script is captured in real time. Does anyone knows what's causing the problem? I notice the onDataReceived even handler for serial port form has a [STAThread] header to it. Will this cause the serial port thread having higher priority than other processes? Thanks in advance.

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treeview binding wpf cannot bind nested property in a class

- by devnet247

Hi all New to wpf and therefore struggling a bit. I am putting together a quick demo before we go for the full implementation I have a treeview on the left with Continent Country City structure when a user select the city it should populate some textboxes in a tabcontrol on the right hand side I made it sort of work but cannot make it work with composite objects. In a nutshell can you spot what is wrong with my zaml or code. Why is not binding to a my CityDetails.ClubsCount or CityDetails.PubsCount? What I am building is based on http://www.codeproject.com/KB/WPF/TreeViewWithViewModel.aspx Thanks a lot for any suggestions or reply DataModel public class City { public City(string cityName) { CityName = cityName; } public string CityName { get; set; } public string Population { get; set; } public string Area { get; set; } public CityDetails CityDetailsInfo { get; set; } } public class CityDetails { public CityDetails(int pubsCount,int clubsCount) { PubsCount = pubsCount; ClubsCount = clubsCount; } public int ClubsCount { get; set; } public int PubsCount { get; set; } } ViewModel public class CityViewModel : TreeViewItemViewModel { private City _city; private RelayCommand _testCommand; public CityViewModel(City city, CountryViewModel countryViewModel):base(countryViewModel,false) { _city = city; } public string CityName { get { return _city.CityName; } } public string Area { get { return _city.Area; } } public string Population { get { return _city.Population; } } public City City { get { return _city; } set { _city = value; } } public CityDetails CityDetailsInfo { get { return _city.CityDetailsInfo; } set { _city.CityDetailsInfo = value; } } } XAML <DockPanel> <DockPanel LastChildFill="True"> <Label DockPanel.Dock="top" Content="Title " HorizontalAlignment="Center"></Label> <StatusBar DockPanel.Dock="Bottom"> <StatusBarItem Content="Status Bar" ></StatusBarItem> </StatusBar> <Grid DockPanel.Dock="Top"> <Grid.ColumnDefinitions> <ColumnDefinition/> <ColumnDefinition Width="Auto"/> <ColumnDefinition Width="2*"/> </Grid.ColumnDefinitions> <TreeView Name="tree" ItemsSource="{Binding Continents}"> <TreeView.ItemContainerStyle> <Style TargetType="{x:Type TreeViewItem}"> <Setter Property="IsExpanded" Value="{Binding IsExpanded,Mode=TwoWay}"/> <Setter Property="IsSelected" Value="{Binding IsSelected,Mode=TwoWay}"/> <Setter Property="FontWeight" Value="Normal"/> <Style.Triggers> <Trigger Property="IsSelected" Value="True"> <Setter Property="FontWeight" Value="Bold"></Setter> </Trigger> </Style.Triggers> </Style> </TreeView.ItemContainerStyle> <TreeView.Resources> <HierarchicalDataTemplate DataType="{x:Type ViewModels:ContinentViewModel}" ItemsSource="{Binding Children}"> <StackPanel Orientation="Horizontal"> <Image Width="16" Height="16" Margin="3,0" Source="Images\Continent.png"/> <TextBlock Text="{Binding ContinentName}"/> </StackPanel> </HierarchicalDataTemplate> <HierarchicalDataTemplate DataType="{x:Type ViewModels:CountryViewModel}" ItemsSource="{Binding Children}"> <StackPanel Orientation="Horizontal"> <Image Width="16" Height="16" Margin="3,0" Source="Images\Country.png"/> <TextBlock Text="{Binding CountryName}"/> </StackPanel> </HierarchicalDataTemplate> <DataTemplate DataType="{x:Type ViewModels:CityViewModel}" > <StackPanel Orientation="Horizontal"> <Image Width="16" Height="16" Margin="3,0" Source="Images\City.png"/> <TextBlock Text="{Binding CityName}"/> </StackPanel> </DataTemplate> </TreeView.Resources> </TreeView> <GridSplitter Grid.Row="0" Grid.Column="1" Background="LightGray" Width="5" HorizontalAlignment="Stretch" VerticalAlignment="Stretch"/> <Grid Grid.Column="2" Margin="5" > <TabControl> <TabItem Header="Details" DataContext="{Binding Path=SelectedItem.City, ElementName=tree, Mode=OneWay}"> <StackPanel > <TextBlock VerticalAlignment="Center" FontSize="12" Text="{Binding CityName}"/> <TextBlock VerticalAlignment="Center" FontSize="12" Text="{Binding Area}"/> <TextBlock VerticalAlignment="Center" FontSize="12" Text="{Binding Population}"/>  <TextBlock VerticalAlignment="Center" FontSize="12" Text="{Binding SelectedItem.CityDetailsInfo.ClubsCount}"/> <TextBlock VerticalAlignment="Center" FontSize="12" Text="{Binding SelectedItem.CityDetailsInfo.PubsCount}"/> </StackPanel> </TabItem> </TabControl> </Grid> </Grid> </DockPanel> </DockPanel>

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Anyone has implemented SMA* search algorithm?

- by Endy

I find the algorithm description in AIMA (Artificial Intelligence: A Modern Approach) is not correct at all. What does 'necessary' mean? What is the memory limit? The queue size or processed nodes? What if the current node has no children at all? I am wondering if this algorithm itself is correct or not. Because I searched the Internet and nobody has implemented it yet. Thanks.

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jQuery to get innerHTML not working on a HTMLFontElement object...

- by Matt

I have jQuery to select all font elements that are children of the element with id="right" within the html stored in the var html... when I do an alert to see how many elements it gets: alert($("#right > font", html).length); it gives me an alert of: 5 but when I try any of the following, I don't get any alerts... alert($("#right > font", html)[0].html()); alert($("#right > font", html)[0].text()); alert($("#right > font", html)[0].val()); Any Ideas? Thanks, Matt

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Should we seal Singletons? Should we try to inherit from Singletons in the first place?

- by devoured elysium

Should a Singleton class be allowed to have children? Should we seal it? What are the pro's and con's? For being able to inherit from a Singleton class, we would have to make the constructor protected instead of private. Now, that will be fine in c#, but the protected word in java gives both child-classes and package-classes access to the constructor. Which means not only classes that inherit from our Singleton can access the constructor but other classes in the same package can do it. I'm a bit confused about all this facts. Maybe I am making a big fuss about nothing to worry about too much? Until now, I never had any necessity of trying to inherit from a Singleton, so maybe this is just an academic question! Thanks

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Exclude first child with XSL-T

- by zneak

Hello, What I'm trying to do is fairly simple, but I can't find the way to. I just want to iterate over the children of a node excluding the first child. For instance, in this XML snippet, I would want all the <bar> elements, except the first one: <foo> <Bar>Example</Bar> <Bar>This is an example</Bar> <Bar>Another example</Bar> <Bar>Bar</Bar> </foo> There is no common attribute by which I can filter (like an id tag or something similar). Any suggestions?

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MonoRail - Select parent category from one dropdown, show child category dropdown

- by Justin

Hey, I'm new to MonoRail and am trying to figure out how to have it so that I can select a parent category in a dropdown then have it show a second dropdown with the categories that are children of the parent. If I were using what I'm used to, ASP.NET MVC, I would have a javascript function that would be called onchange of the first dropdown and would make an ajax call to a controller method (passing in the selected parent category id) that would grab all child categories of that parent category and return them in JSON. Then in the callback javascript function I would eval the JSON and populate the second dropdown with the child categories. How would I do this using MonoRail/jQuery? Here's the code I have so far: $FormHelper.Select("business.category.id", $categories, "%{value='id', text='name', firstoption='Select a Category'}") $FormHelper.Select("business.category.id", $childCategories, "%{value='id', text='name', firstoption='Select a Sub-Category'}") Then in BusinessController.cs: private void AddDataToModels() { PropertyBag["categories"] = CategoryRepository.GetParentCategories(); PropertyBag["childCategories"] = CategoryRepository.GetChildCategories(1); } Thanks for any input on how to approach this! Justin

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Placing figure in top-right corner of another

- by Ivan Dubrov

I want child figure (org.eclipse.draw2d.Figure) to be relative to the top-right corner of the parent (I want place some small icon, which will be ImageFigure, to be 12 pixels from top and right borders). Is there an existing layout manager that can layout child this way? The org.eclipse.draw2d.XYLayout is not capable of measuring position relative to corner other than top-left. Of course, I can: Write layout manager myself Layout children figure every time bounds are changed for the parent (in parent layout() method). However, I would like to know if some existing layout manager provides that functionality.

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