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  • If I'm updating a DataRow, do I lock the entire DataTable or just the DataRow?

    - by Dan Tao
    Suppose I'm accessing a DataTable from multiple threads. If I want to access a particular row, I suspect I need to lock that operation (I could be mistaken about this, but at least I know this way I'm safe): // this is a strongly-typed table OrdersRow row = null; lock (orderTable.Rows.SyncRoot) { row = orderTable.FindByOrderId(myOrderId); } But then, if I want to update that row, should I lock the table (or rather, the table's Rows.SyncRoot object) again, or can I simply lock the row?

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  • How to write the content of a dictionary to a text file?

    - by codemonkie
    I have a dictionary object of type Dictionary and trying to use StreamWriter to output the entire content to a text file but failed to find the correct method from the Dictionary class. using (StreamWriter sw = new StreamWriter("myfile.txt")) { sw.WriteLine(dictionary.First()); } I can only retrieve the first element and it is bounded by a square bracket plus a comma separator in between as well: [Peter, Admin] and would be nice to have [Peter Admin] (without the comma)

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  • Python Code Introspection and Analysis

    - by oneself
    Hi, I am trying to write a Python code analyzer, and I am trying to avoid having to parse bare Python text files. I was hoping that once the Python compiler/interpreter parses the code there's a way to get to the object code or parse tree from within a running Python program. Is there anyway to do this? Thank you

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  • How do I eliminate TT's "Wide character in print" warning ?

    - by planetp
    I have this warning every time I run my CGI-script (output is rendered by Template::Toolkit): Wide character in print at /usr/local/lib/perl5/site_perl/5.8.9/mach/Template.pm line 163. What's the right way to eliminate it? I create the tt object using this config: my %config = ( ENCODING => 'utf8', INCLUDE_PATH => $ENV{TEMPLATES_DIR}, EVAL_PERL => 1, } my $tt = Template->new(\%config);

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  • querying nested array elements in C#

    - by the berserker
    I have following object structure, deseralized from XML (WS): <ns2:Category> <ns2:CategoryId>800003</ns2:CategoryId> <ns2:CategoryName>Name1</ns2:CategoryName> <ns2:Categories> <ns2:Category> <ns2:CategoryId>800008</ns2:CategoryId> <ns2:CategoryName>Name2</ns2:CategoryName> <ns2:Categories> <ns2:Category> <ns2:CategoryId>800018</ns2:CategoryId> <ns2:CategoryName>Name3</ns2:CategoryName> <ns2:Categories/> </ns2:Category> <ns2:Category> <ns2:CategoryId>800028</ns2:CategoryId> <ns2:CategoryName>Name4</ns2:CategoryName> <ns2:Categories/> </ns2:Category> </ns2:Categories> </ns2:Category> <ns2:Category> <ns2:CategoryId>800009</ns2:CategoryId> <ns2:CategoryName>Name5</ns2:CategoryName> <ns2:Categories> <ns2:Category> <ns2:CategoryId>800019</ns2:CategoryId> <ns2:CategoryName>Name6</ns2:CategoryName> <ns2:Categories> <ns2:Category> <ns2:CategoryId>800119</ns2:CategoryId> <ns2:CategoryName>Name7</ns2:CategoryName> <ns2:Categories/> </ns2:Category> <ns2:Category> <ns2:CategoryId>800219</ns2:CategoryId> <ns2:CategoryName>Name111</ns2:CategoryName> <ns2:Categories/> </ns2:Category> </ns2:Categories> </ns2:Category> </ns2:Categories> </ns2:Category> </ns2:Categories> </ns2:Category> How would I find Category object with CategoryId 800119 efficiently? So, Im looking for something like FindCategory(long categoryId) - Prefferably with LINQ to objects. Any other option?

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  • Class generation on the fly

    - by James P.
    Is it possible to generate subclasses at runtime or while an application is running? If so, how is this achieved and what precautions should be taken to prevent a rogue object wreaking havoc inside an application?

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  • What makes Ometa special?

    - by Brian
    Ometa is "a new object-oriented language for pattern matching." I've encountered pattern matching in languages like Oz tools to parse grammars like Lexx/Yacc or Pyparsing before. Despite looking at example code, reading discussions, and talking to a friend, I still am not able to get a real understanding of what makes Ometa special (or at least, why some people think it is). Any explanation?

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  • doubt regarding carrying data in custom events using actionscript

    - by user267530
    Hi I am working on actionscript to generate a SWF dynamically using JSON data coming from an HTTP request. I receive the data on creationComplete and try to generate a tree like structure. I don’t create the whole tree at the same time. I create 2 levels, level 1 and level 2. My goal is to attach custom events on the panels which represent tree nodes. When users click the panels, it dispatches custom events and try to generate the next level. So, it goes like this : On creation complete - get JSON- create top tow levels - click on level 2- create the level 2 and level 3 - click on level 3- create level 3 and 4. …and so on and so on. I am attaching my code with this email. Please take a look at it and if you have any hints on how you would do this if you need to paint a tree having total level number = “n” where( 0 import com.iwobanas.effects.*; import flash.events.MouseEvent; import flash.filters.BitmapFilterQuality; import flash.filters.BitmapFilterType; import flash.filters.GradientGlowFilter; import mx.controls.Alert; private var roundedMask:Sprite; private var panel:NewPanel; public var oldPanelIds:Array = new Array(); public var pages:Array = new Array();//cleanup public var delPages:Array = new Array(); public function DrawPlaybook(pos:Number,title:String,chld:Object):void { panel = new NewPanel(chld); panel.title = title; panel.name=title; panel.width = 100; panel.height = 80; panel.x=pos+5; panel.y=40; // Define a gradient glow. var gradientGlow:GradientGlowFilter = new GradientGlowFilter(); gradientGlow.distance = 0; gradientGlow.angle = 45; gradientGlow.colors = [0xFFFFF0, 0xFFFFFF]; gradientGlow.alphas = [0, 1]; gradientGlow.ratios = [0, 255]; gradientGlow.blurX = 10; gradientGlow.blurY = 10; gradientGlow.strength = 2; gradientGlow.quality = BitmapFilterQuality.HIGH; gradientGlow.type = BitmapFilterType.OUTER; panel.filters =[gradientGlow]; this.rawChildren.addChild(panel); pages.push(panel); panel.addEventListener(MouseEvent.CLICK, function(e:MouseEvent){onClickHandler(e,title,chld)}); this.addEventListener(CustomPageClickEvent.PANEL_CLICKED, function(e:CustomPageClickEvent){onCustomPanelClicked(e,title)}); } public function onClickHandler(e:MouseEvent,title:String,chld:Object):void { //var panel:Panel; for each(var stp1:NewPanel in pages){ if(stp1.title==title){ var eventObj:CustomPageClickEvent = new CustomPageClickEvent("panelClicked"); eventObj.panelClicked = stp1; dispatchEvent(eventObj); } } } private function onCustomPanelClicked(e:CustomPageClickEvent,title:String):void { //cleanup itself Alert.show("onCustomPanelClicked" + title); var panel:NewPanel; for each(var stp:NewPanel in pages){ startAnimation(e,stp); } if(title == e.panelClicked.title){ panel = new NewPanel(null); panel.title = title; panel.name=title; panel.width = 150; panel.height = 80; panel.x=100; panel.y=40; this.rawChildren.addChild(panel); // var slideRight:SlideRight = new SlideRight(); slideRight.target=panel; slideRight.duration=750; slideRight.showTarget=true; slideRight.play(); //draw the steps var jsonData = this.map.getValue(title); var posX:Number = 50; var posY:Number = 175; for each ( var pnl:NewPanel in pages){ pages.pop(); } for each ( var stp1:Object in jsonData.children){ //Alert.show("map step=" + stp.text ); panel = new NewPanel(null); panel.title = stp1.text; panel.name=stp1.id; panel.width = 100; panel.id=stp1.id; panel.height = 80; panel.x = posX; panel.y=posY; posX+=150; var s:String="hi" + stp1.text; panel.addEventListener(MouseEvent.CLICK, function(e:MouseEvent){onChildClick(e,s);}); this.addEventListener(CustomPageClickEvent.PANEL_CLICKED, function(e:CustomPageClickEvent){onCustomPnlClicked(e)}); this.rawChildren.addChild(panel); // Alert.show("map step=" + this.getChildIndex(panel) ); // oldPanelIds.push(panel); pages.push(panel); //this.addEventListener(CustomPageClickEvent.PANEL_CLICKED, //function(e:CustomPageClickEvent){onCustomPanelClicked(e,title)}); var slide:SlideUp = new SlideUp(); slide.target=panel; slide.duration=1500; slide.showTarget=false; slide.play(); } } } public function onChildClick(e:MouseEvent,s:String):void { //var panel:Panel; //Alert.show(e.currentTarget.title); for each(var stp1:NewPanel in pages){ if(stp1.title==e.currentTarget.title){ var eventObj:CustomPageClickEvent = new CustomPageClickEvent("panelClicked"); eventObj.panelClicked = stp1; dispatchEvent(eventObj); } } } private function onCustomPnlClicked(e:CustomPageClickEvent):void { for each ( var pnl:NewPanel in pages){ pages.pop(); } //onCustomPanelClicked(e,e.currentTarget.title); //Alert.show("hi from cstm" + e.panelClicked.title); } private function fadePanel(event:Event,panel:NewPanel):void{ panel.alpha -= .005; if (panel.alpha <= 0){ //Alert.show(panel.title); panel.removeEventListener(Event.ENTER_FRAME, function(e:Event){fadePanel(e,panel);}); }; panel.title=""; } private function startAnimation(event:CustomPageClickEvent,panel:NewPanel):void{ panel.addEventListener(Event.ENTER_FRAME, function(e:Event){fadePanel(e,panel)}); } Thanks in advance. Palash

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  • dynamic char array sizing

    - by droseman
    Hello, In my application, I have a char array defined which can take one of three options: "okay", "high", "low" which are then sent down a serial port to a remote device. I currently have the array sized to take the 4 character words plus carriage return and line feed, but when I have to send "low" I get a null character in the strings, which I am concerned would confuse the host terminal. array definition char mod1_status_char[6] = {'0','0','0','0','0','0'}; char mod2_status_char[6] = {'0','0','0','0','0','0'}; char mod3_status_char[6] = {'0','0','0','0','0','0'}; sample of switch case statement: void DCOKStatus(uint8_t *ptr_status) { uint8_t status = *ptr_status; switch (status) { case 0x00: strcpy(mod1_status_char, "okay"); strcpy(mod2_status_char, "okay"); strcpy(mod3_status_char, "okay"); break; case 0x10: strcpy(mod1_status_char, "okay"); strcpy(mod2_status_char, "okay"); strcpy(mod3_status_char, "low"); break; } This is the struct which makes the message string to send strcpy(MsgStatus_on.descriptor_msg, "$psu_"); MsgStatus_on.address01 = hex_addr[0]; MsgStatus_on.address02 = hex_addr[1]; MsgStatus_on.space01 = 0x20; strcpy(MsgStatus_on.cmdmsg01, "op_en op1_"); strcpy(MsgStatus_on.statusmsg01, mod1_status_char); MsgStatus_on.space02 = 0x20; strcpy(MsgStatus_on.cmdmsg02, "op2_"); strcpy(MsgStatus_on.statusmsg02, mod2_status_char); MsgStatus_on.space03 = 0x20; strcpy(MsgStatus_on.cmdmsg03, "op3_"); strcpy(MsgStatus_on.statusmsg03, mod3_status_char); MsgStatus_on.CR = 0x0D; MsgStatus_on.LF = 0x0A; and this sends the message void USARTWrite(char *object, uint32_t size) { GPIO_SetBits(GPIOB, GPIO_Pin_1); char *byte; for (byte = object; size--; ++byte) { USART_SendData(USART1,*byte); } Would anyone be able to suggest a good approach to dynamically size the array to one character shorter when I need to send "low"? Thanks

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  • Command line semaphore utility

    - by compie
    I want to write a command line utility that can be used to synchronize the execution off programs in different consoles. Console A: $ first_program && semaphore -signal Console B: $ semaphore -wait && second_program The first program takes a long take to complete. The second program can only start when the first program has finished. Which synchronization object do I need to implement this (in Python)?

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  • reverse this function

    - by ooo
    i have code that takes a csharp datetime and converts it into a long to plot in the "flot" graph. here is the code public static long GetJavascriptTimestamp(DateTime input) { TimeSpan span = new TimeSpan(DateTime.Parse("1/1/1970").Ticks); DateTime time = input.Subtract(span); return (long)(time.Ticks / 10000); } I now need an opposite function where i take this long value and get the csharp datetime object back. any idea if the above method can be reversed ?

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  • Multiple XADES signature / get original document

    - by zuper
    I want to ask if exsist a way in xades4j to made multiple signature. For multiple signature i mean not countersignature, but a double independent sign to the same document, the resulting signature will have 2 or more signature object. In pratice a signer can take a xml signed document as input and resign it. In other way i need a method to take as input a xml signed file and get as output the original xml document. Thanks, Michele

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  • What is the best scripting language to embed in a C# desktop application.

    - by Ewan Makepeace
    We are writing a complex rich desktop application and need to offer flexibility in reporting formats so we thought we would just expose our object model to a scripting langauge. Time was when that meant VBA (which is still an option), but the managed code derivative VSTA (I think) seems to have withered on the vine. What is now the best choice for an embedded scripting language on Windows .NET?

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  • Setting log level of message at runtime in slf4j

    - by scompt.com
    When using log4j, the Logger.log(Priority p, Object message) method is available and can be used to log a message at a log level determined at runtime. We're using this fact and this tip to redirect stderr to a logger at a specific log level. slf4j doesn't have a generic log() method that I can find. Does that mean there's no way to implement the above?

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  • ListBox item doesn't get refresh in WPF?

    - by sanjeev40084
    I have a listbox which has couple of items. When double clicked on each item, the user get option to edit item (text of item). Now once i update the item, my item in listbox doesn't get updated. The first window (one which has listbox) is in MainWindow.xaml file and second window is in EditTaskView.xaml(one which let's edit the items text) file. The code that displays items in lists is: Main.Windows.cs public static ObservableCollection TaskList; public void GetTask() { TaskList = new ObservableCollection<Task> { new Task("Task1"), new Task("Task2"), new Task("Task3"), new Task("Task4") }; lstBxTask.ItemsSource = TaskList; } private void lstBxTask_MouseDoubleClick(object sender, MouseButtonEventArgs e) { var selectedTask = (Task)lstBxTask.SelectedItem; EditTask.txtBxEditedText.Text = selectedTask.Taskname; EditTask.PreviousTaskText = selectedTask.Taskname; EditTask.Visibility = Visibility.Visible; } The xaml code that displays the list: <ListBox x:Name="lstBxTask" Style="{StaticResource ListBoxItems}" MouseDoubleClick="lstBxTask_MouseDoubleClick"> <ListBox.ItemTemplate> <DataTemplate> <StackPanel> <Rectangle Style="{StaticResource LineBetweenListBox}"/> <StackPanel Orientation="Horizontal"> <TextBlock Text="{Binding Taskname}" Style="{StaticResource TextInListBox}"/> <Button Name="btnDelete" Style="{StaticResource DeleteButton}" Click="btnDelete_Click"/> </StackPanel> </StackPanel> </DataTemplate> </ListBox.ItemTemplate> </ListBox> <ToDoTask:EditTaskView x:Name="EditTask" Grid.Row="1" Grid.RowSpan="2" Grid.ColumnSpan="2" Visibility="Collapsed"/> The Save button in TaskEditView.xaml does this: public string PreviousTaskText { get; set; } private void btnSaveEditedText_Click(object sender, RoutedEventArgs e) { foreach (var t in MainWindow.TaskList) { if (t.Taskname == PreviousTaskText) { t.Taskname = txtBxEditedText.Text; } } Visibility = Visibility.Collapsed; } TaskList is the ObservableCollection, and i though once you update the value the UI gets refreshed. But doesn't seem to work that way. What am i missing?

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  • Flash hit detect area

    - by Quandary
    With Flash, is it possible to detect whether an object is fully ontop of another ? E.g. I have a rectangle (floor surface) and a circle (furniture). Now I want to detect whether the circle is fully in (=over) the rectangle, and not just whether it hits the rectangle somewhere. Is that possible ? How ?

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  • getting error when using mapkit in xcode?

    - by Rahul Vyas
    'NSInvalidUnarchiveOperationException', reason: '*** -[NSKeyedUnarchiver decodeObjectForKey:]: cannot decode object of class (MKMapView)' i am getting this error.am i missed something.i don't know from where to add MApkit.framework first i tried with target-getInfo and then from the bottom + sign added framework but that did not wrked.then i search in spotlight and added another framework.by adding this it removed previous error but gives the above one.what is the exact location of mapkit framework. i want to test it in simulator.

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  • Javascript callback and google maps api question

    - by es11
    I am using google maps api v3 and have an array of arrays object: MVCArray.<MVCArray.<LatLng>> I want to iterate over this. I see that MVCArray has a method forEach which uses a call back, but I have no idea how to use this (I haven't done much js). The api defines this method as follows: forEach(callback:function(*, number))) Could somebody please show me an example of how to use this given an MVCArray of MVCArrays?

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  • How to delegate SwingWorker's publish to other methods

    - by Savvas Dalkitsis
    My "problem" can be described by the following. Assume we have an intensive process that we want to have running in the background and have it update a Swing JProgress bar. The solution is easy: import java.util.List; import javax.swing.JOptionPane; import javax.swing.JProgressBar; import javax.swing.SwingWorker; /** * @author Savvas Dalkitsis */ public class Test { public static void main(String[] args) { final JProgressBar progressBar = new JProgressBar(0,99); SwingWorker<Void, Integer> w = new SwingWorker<Void, Integer>(){ @Override protected void process(List<Integer> chunks) { progressBar.setValue(chunks.get(chunks.size()-1)); } @Override protected Void doInBackground() throws Exception { for (int i=0;i<100;i++) { publish(i); Thread.sleep(300); } return null; } }; w.execute(); JOptionPane.showOptionDialog(null, new Object[] { "Process", progressBar }, "Process", JOptionPane.OK_CANCEL_OPTION, JOptionPane.QUESTION_MESSAGE, null, null, null); } } Now assume that i have various methods that take a long time. For instance we have a method that downloads a file from a server. Or another that uploads to a server. Or anything really. What is the proper way of delegating the publish method to those methods so that they can update the GUI appropriately? What i have found so far is this (assume that the method "aMethod" resides in some other package for instance): import java.awt.event.ActionEvent; import java.util.List; import javax.swing.AbstractAction; import javax.swing.Action; import javax.swing.JOptionPane; import javax.swing.JProgressBar; import javax.swing.SwingWorker; /** * @author Savvas Dalkitsis */ public class Test { public static void main(String[] args) { final JProgressBar progressBar = new JProgressBar(0,99); SwingWorker<Void, Integer> w = new SwingWorker<Void, Integer>(){ @Override protected void process(List<Integer> chunks) { progressBar.setValue(chunks.get(chunks.size()-1)); } @SuppressWarnings("serial") @Override protected Void doInBackground() throws Exception { aMethod(new AbstractAction() { @Override public void actionPerformed(ActionEvent e) { publish((Integer)getValue("progress")); } }); return null; } }; w.execute(); JOptionPane.showOptionDialog(null, new Object[] { "Process", progressBar }, "Process", JOptionPane.OK_CANCEL_OPTION, JOptionPane.QUESTION_MESSAGE, null, null, null); } public static void aMethod (Action action) { for (int i=0;i<100;i++) { action.putValue("progress", i); action.actionPerformed(null); try { Thread.sleep(300); } catch (InterruptedException e) { e.printStackTrace(); } } } } It works but i know it lacks something. Any thoughts?

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  • Python read multiline JSON

    - by Paul W
    I have been trying to use JSON to store settings for a program. I can't seem to get Python 2.6 's JSON Decoder to decode multi-line JSON strings... Here is example input: .settings file: """ {\ 'user':'username',\ 'password':'passwd',\ }\ """ I have tried a couple other syntaxes for this file, which I will specify below (with the traceback they cause). My python code for reading the file in is import json settings_text = open(".settings", "r").read() settings = json.loads(settings_text) The Traceback for this is: Traceback (most recent call last): File "json_test.py", line 4, in <module> print json.loads(text) File "/System/Library/Frameworks/Python.framework/Versions/2.6/lib/python2.6/json/__init__.py", line 307, in loads return _default_decoder.decode(s) File "/System/Library/Frameworks/Python.framework/Versions/2.6/lib/python2.6/json/decoder.py", line 322, in decode raise ValueError(errmsg("Extra data", s, end, len(s))) ValueError: Extra data: line 1 column 2 - line 7 column 1 (char 2 - 41) I assume the "Extra data" is the triple-quote. Here are the other syntaxes I have tried for the .settings file, with their respective Tracebacks: "{\ 'user':'username',\ 'pass':'passwd'\ }" Traceback (most recent call last): File "json_test.py", line 4, in <module> print json.loads(text) File "/System/Library/Frameworks/Python.framework/Versions/2.6/lib/python2.6/json/__init__.py", line 307, in loads return _default_decoder.decode(s) File "/System/Library/Frameworks/Python.framework/Versions/2.6/lib/python2.6/json/decoder.py", line 319, in decode obj, end = self.raw_decode(s, idx=_w(s, 0).end()) File "/System/Library/Frameworks/Python.framework/Versions/2.6/lib/python2.6/json/decoder.py", line 336, in raw_decode obj, end = self._scanner.iterscan(s, **kw).next() File "/System/Library/Frameworks/Python.framework/Versions/2.6/lib/python2.6/json/scanner.py", line 55, in iterscan rval, next_pos = action(m, context) File "/System/Library/Frameworks/Python.framework/Versions/2.6/lib/python2.6/json/decoder.py", line 155, in JSONString return scanstring(match.string, match.end(), encoding, strict) ValueError: Invalid \escape: line 1 column 2 (char 2) '{\ "user":"username",\ "pass":"passwd",\ }' Traceback (most recent call last): File "json_test.py", line 4, in <module> print json.loads(text) File "/System/Library/Frameworks/Python.framework/Versions/2.6/lib/python2.6/json/__init__.py", line 307, in loads return _default_decoder.decode(s) File "/System/Library/Frameworks/Python.framework/Versions/2.6/lib/python2.6/json/decoder.py", line 319, in decode obj, end = self.raw_decode(s, idx=_w(s, 0).end()) File "/System/Library/Frameworks/Python.framework/Versions/2.6/lib/python2.6/json/decoder.py", line 338, in raw_decode raise ValueError("No JSON object could be decoded") ValueError: No JSON object could be decoded If I put the settings all on one line, it decodes fine.

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