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  • When will the ValueConverter's Convert method be called in wpf

    - by sudarsanyes
    I have an ObservableCollection bound to a list box and a boolean property bound to a button. I then defined two converters, one that operates on the collection and the other operates on the boolean property. Whenever I modify the boolean property, the converter's Convert method is called, where as the same is not called if I modify the observable collection. What am I missing?? Snippets for your reference, xaml snipet, <Window.Resources> <local:WrapPanelWidthConverter x:Key="WrapPanelWidthConverter" /> <local:StateToColorConverter x:Key="StateToColorConverter" /> </Window.Resources> <StackPanel> <ListBox x:Name="NamesListBox" ItemsSource="{Binding Path=Names}"> <ListBox.ItemsPanel> <ItemsPanelTemplate> <WrapPanel x:Name="ItemWrapPanel" Width="500" Background="Gray"> <WrapPanel.RenderTransform> <TranslateTransform x:Name="WrapPanelTranslatation" X="0" /> </WrapPanel.RenderTransform> <WrapPanel.Triggers> <EventTrigger RoutedEvent="WrapPanel.Loaded"> <BeginStoryboard> <Storyboard> <DoubleAnimation Storyboard.TargetName="WrapPanelTranslatation" Storyboard.TargetProperty="X" To="{Binding Path=Names,Converter={StaticResource WrapPanelWidthConverter}}" From="525" Duration="0:0:2" RepeatBehavior="100" /> </Storyboard> </BeginStoryboard> </EventTrigger> </WrapPanel.Triggers> </WrapPanel> </ItemsPanelTemplate> </ListBox.ItemsPanel> <ListBox.ItemTemplate> <DataTemplate> <Grid> <Label Content="{Binding}" Width="50" Background="LightGray" /> </Grid> </DataTemplate> </ListBox.ItemTemplate> </ListBox> <Button Content="{Binding Path=State}" Background="{Binding Path=State, Converter={StaticResource StateToColorConverter}}" Width="100" Height="100" Click="Button_Click" /> </StackPanel> code behind snippet public class WrapPanelWidthConverter : IValueConverter { public object Convert(object value, Type targetType, object parameter, System.Globalization.CultureInfo culture) { ObservableCollection<string> aNames = value as ObservableCollection<string>; return -(aNames.Count * 50); } public object ConvertBack(object value, Type targetType, object parameter, System.Globalization.CultureInfo culture) { throw new NotImplementedException(); } } public class StateToColorConverter : IValueConverter { public object Convert(object value, Type targetType, object parameter, System.Globalization.CultureInfo culture) { bool aState = (bool)value; if (aState) return Brushes.Green; else return Brushes.Red; } public object ConvertBack(object value, Type targetType, object parameter, System.Globalization.CultureInfo culture) { throw new NotImplementedException(); } }

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  • Passing parameters from android to .Net Web Service

    - by benjamin schultz
    I have an Android application that uses kSoap in connecting to my web services. This particular one is passing in a string value as a parameter, then my web service will use that parameter to query my database via a stored procedure. Problem is, I know how to pass the parameter from android, but I don't know how to retrieve it in my .Net(vb) web service and use it. Anyone have any code examples or a link to a tutorial to help me out? Thanks!

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  • AccessViolationException thrown

    - by user255371
    Hi, I’m working on a project that’s written in C# and uses a C++ dll to communicate with a robot. Originally the software was written in C# VS 2003 and was converted to VS 2008 (no change to the code) using .Net 2.0. Now, I started seeing the “Attempted to read or write protected memory…” on some computers. The Access violation error is always thrown when the code calls a particular method from the dll, however, that very same method is called over and over throughout the task and executes fine, just sometimes it throws the error. Also, the robot seems to execute the command fine which tells me that the values passed into the dll exist and thus are accessible. The software with the .Net 1.1 has been used for years and worked fine without ever throwing any memory errors. Now that it has been using .Net 2.0 it throws errors on some computers only. I’m not sure what’s causing the issue. I ruled out inappropriate calling (incorrect marshalling …) of the dll methods as it has been working fine with .Net 1.1 for years and thus should work fine in .Net 2.0 as well. I’ve seen some posts suggesting that it could be the GC, but then again why would it only happen on this one computer and only sometimes. Also, the values passed in are all global variables in the C# code and thus they should exist until the application is shut down and GC has no business moving any of those around or deleting them. Another observation, as I mentioned above, the robot executes the command normally which means that it gets all its necessary values. Not sure what the C++ dll’s method would do at the end where the GC could mess up stuff. It shouldn’t try to delete the global variables passed in and the method is not modifying those variables either (I’m not expecting any return values through the passed in values, the only return value is the method return which again shouldn’t have anything to do with GC.) One important piece of information I should add is that I have no access to the C++ code and thus cannot make any changes there. The fix has to come through the C# code or some settings on the computer or something else that I am in control of. Any help greatly appreciated. Thanks. Code snippet: Original method call in VS 2003 [DllImport("TOOLB32.dll",EntryPoint="TbxMoveWash")] public static extern int TbxMoveWash(int tArmId, string lpszCarrierRackId, int eZSelect, int[] lpTipSet, int tVol, bool bFastW); which I modified after seeing the error to the following (but the error still occurs): [DllImport("TOOLB32.dll",EntryPoint="TbxMoveWash")] public static extern int TbxMoveWash(int tArmId, string lpszCarrierRackId, int eZSelect, [MarshalAs(UnmanagedType.LPArray, SizeConst = 8)] int[] lpTipSet, int tVol, bool bFastW);

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  • iPhone: Set the title of a UIButton with a single method invocation?

    - by Greg Maletic
    I'd like to set the title of a UIButton via code. I find myself having to call -[UIButton setTitle:forState:] for UIControlStateNormal, UIControlStateHighlighted, UIControlStateDisabled, UIControlStateSelected. And that doesn't even take into account all of the combinations of these states together. Needless to say, this is tiresome. Is there a single call I can make that will set one string as the title for all of the states? (Since, I assume that in 95% of the cases, that's the desired behavior?)

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  • Using Valgrind tool how can I detect which object trying to access 0x0 address ?

    - by Davit Siradeghyan
    I have this output when trying to debug Program received signal SIGSEGV, Segmentation fault 0x43989029 in std::string::compare (this=0x88fd430, __str=@0xbfff9060) at /home/devsw/tmp/objdir/i686-pc-linux-gnu/libstdc++-v3/include/bits/char_traits.h:253 253 { return memcmp(__s1, __s2, __n); } Current language: auto; currently c++ Using valgrind I getting this output ==12485== Process terminating with default action of signal 11 (SIGSEGV) ==12485== Bad permissions for mapped region at address 0x0 ==12485== at 0x1: (within path_to_my_executable_file/executable_file)

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  • Does hibernate query result always return a list?

    - by Phoenix
    Does a query execution always have to return a list ? How do I replace the code below if I am sure it will only return a single object ? @Override public List<DocInfo> findAllByDocId(String docId) { Query q = getCurrentSession().createQuery("from DocInfo item where item.id = :docId"); q.setString("docId", docId); List<DocInfo> docInfoList = q.list(); return docInfoList; }

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  • view headers in JTable?

    - by Venkats
    I can't view header in JTable while adding it into a JFrame.. String[] col={"Name","ID","Marks"}; Object[][] data={{"venkat",201,450},{"Ramesh",102,450},{"Rahul",2,430}, {"Thiman",4,434}}; table=new JTable(data,col); The above code doesn't set header in JFrame. How to add view header in JTable while adding it into JFrame.....?

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  • UTF-8 Database Problem

    - by Danten
    I've a MySQL table that has a UTF-8 charset and upon attempting to insert to it via a PHP form, the database gives the following error: PDOStatement::execute(): SQLSTATE[HY000]: General error: 1366 Incorrect string value: '\xE8' for column ... The character in question is 'è', yet I don't see why this should be a problem considering the database and table are set to UTF-8.

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  • NSUserDefaults always returns 0, in Simulator and Device

    - by joec
    I have a settings bundle in my iPhone app, with the following PList: Type: PSMultiValueSpecifier Title: Within (Kilometres) DefaultValue: Number: 1 Titles: Array: Item 1: Number: 1 Item 2: Number: 2 Values: Array: Item 1: Number: 1 Item 2: Number: 2 Key: String: km Then in my code i have: NSUserDefaults *defaults = [NSUserDefaults standardUserDefaults]; NSInteger choiceOne = [defaults integerForKey:@"km"]; choiceOne is always 0. What am i doing wrong? Thanks

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  • JSOn.Net library JsonConvert

    - by ozsenegal
    I'm using http://json.codeplex.com library.Im trying to convert XML to JSON and vice-versa. However they have an example,using "JsonConvert" class XmlDocument doc = new XmlDocument(); doc.LoadXml(xml); string jsonText = JsonConvert.SerializeXmlNode(doc); I cant find "JsonConvert" in namespace "Newtonsoft.Json".Only class i've found is "JavaScriptConvert". Any ideas?

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  • How to retrieve video thumbnail from an absolute path?

    - by steff
    Hi everyone, I know this has to be trivial but I just don't find the right resource, I guess. So all I want to do is retrieving a thumbnail for a video. All I have is the absolute path to the file on the sdcard as a String. So please point me into the right direction. And believe me, this is embarrassing enough to ask... Regards, Steff

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  • From varchar(36) to UNIQUEIDENTIFIER

    - by jgonchik
    I am trying to cast an AuctionId that is a UNIQUEIDENTIFIER to an varchar(36) and then back to an UNIQUEIDENTIFIER. Please help me. CAST((SUBSTRING(CAST([AuctionId] as VARCHAR(36)), 0, 35) + '1') AS UNIQUEIDENTIFIER) But I keep getting this error: Msg 8169, Level 16, State 2, Line 647 Conversion failed when converting from a character string to uniqueidentifier. Thanks in advance

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  • Efficiency of Java "Double Brace Initialization"?

    - by Jim Ferrans
    In Hidden Features of Java the top answer mentions Double Brace Initialization, with a very enticing syntax: Set<String> flavors = new HashSet<String>() {{ add("vanilla"); add("strawberry"); add("chocolate"); add("butter pecan"); }}; This idiom creates an anonymous inner class with just an instance initializer in it, which "can use any [...] methods in the containing scope". Main question: Is this as inefficient as it sounds? Should its use be limited to one-off initializations? (And of course showing off!) Second question: The new HashSet must be the "this" used in the instance initializer ... can anyone shed light on the mechanism? Third question: Is this idiom too obscure to use in production code? Summary: Very, very nice answers, thanks everyone. On question (3), people felt the syntax should be clear (though I'd recommend an occasional comment, especially if your code will pass on to developers who may not be familiar with it). On question (1), The generated code should run quickly. The extra .class files do cause jar file clutter, and slow program startup slightly (thanks to coobird for measuring that). Thilo pointed out that garbage collection can be affected, and the memory cost for the extra loaded classes may be a factor in some cases. Question (2) turned out to be most interesting to me. If I understand the answers, what's happening in DBI is that the anonymous inner class extends the class of the object being constructed by the new operator, and hence has a "this" value referencing the instance being constructed. Very neat. Overall, DBI strikes me as something of an intellectual curiousity. Coobird and others point out you can achieve the same effect with Arrays.asList, varargs methods, Google Collections, and the proposed Java 7 Collection literals. Newer JVM languages like Scala, JRuby, and Groovy also offer concise notations for list construction, and interoperate well with Java. Given that DBI clutters up the classpath, slows down class loading a bit, and makes the code a tad more obscure, I'd probably shy away from it. However, I plan to spring this on a friend who's just gotten his SCJP and loves good natured jousts about Java semantics! ;-) Thanks everyone!

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  • C# alternative for javascript escape function

    - by FosterZ
    hi, what is an alternative for javascript escape function in c# for e.g suppose a string:"Hi Foster's i'm missing /you" will give "Hi%20Foster%27s%20i%27m%20missing%20/you" if we use javascript escape function, but what is the alternative for c#. i have searched for it but no use.

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  • Double.TryParse() input decimal separator different than system decimal separator

    - by mare
    I have a source XML that uses a dot (".") as a decimal separator and I am parsing this on a system that uses a comma (",") as a decimal separator. As a result, value of 0.7 gets parsed with Double.TryParse or Double.Parse as 7000000. What are my options to parse correctly? One of them is to replace dots in source with commas with String.Replace('.', ',') but I don't think I like this very much.

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  • android incoming call screen

    - by shaimagz
    I would like to add details to the incoming call screen on android. lets say I have a string 'x', so I want 'x' to show up on the incoming call screen under the name of the person who is currently calling. I know this is possible because of this apps: CallerId, Vringo I'm pretty new to this area, so I need to know what is the process to achieve that, for example: get the event of incoming call, go to the incoming call interface and so on. Thanks!

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  • Best practices for custom http user-agent strings?

    - by Noufal Ibrahim
    I'm developing an application that communicates with an internal web service using HTTP. Are there any "best practices" for custom user-agent strings so that I can put a nice one in my app? It's a Python library and the lower transport is Python's own httplib. Should the user-agent string say that or something else?

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  • Get from Android BroadcastReciever to a UI

    - by Andy
    I have a reciever that works well, but I can't seem to show a proper UI, although the toast appears correctly. As far as I can tell, this is caused by Android requiring the class to extend Activity, however, the class already extends BroadcastReciever, so I can't do this. So, I tried to do an Intent, but this failed too. There are no errors, but the screen doesn't show. Source code is below, and any help would be most appreciated. Reciever public class Reciever extends BroadcastReceiver { @Override public void onReceive(Context context, Intent intent) { Toast.makeText(context, "Alarm Recieved", Toast.LENGTH_LONG).show(); Intent i = new Intent(); i.setClass(context, AlarmRing.class); } } AlarmRing public class AlarmRing extends Activity { /** Called when the activity is first created. */ @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.alarm); MediaPlayer mp = MediaPlayer.create(getBaseContext(), R.raw.sweetchild); mp.start(); } Manifest <?xml version="1.0" encoding="utf-8"?> <manifest xmlns:android="http://schemas.android.com/apk/res/android" package="com.comaad.andyroidalarm" android:versionCode="1" android:versionName="1.0"> <application android:icon="@drawable/icon" android:label="@string/app_name"> <activity android:name=".AndyRoidAlarm" android:label="@string/app_name"> <intent-filter> <action android:name="android.intent.action.MAIN" /> <category android:name="android.intent.category.LAUNCHER" /> </intent-filter> </activity> <receiver android:name="com.comaad.andyroidalarm.Reciever" android:enabled="true"> <intent-filter> <action android:name="com.comaad.andyroidalarm.Reciever"></action> </intent-filter> </receiver> <activity android:name=".AlarmRing"></activity> </application> </manifest> }

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  • [MSIL] Variable comparison

    - by alexn
    Hi, The following C#-snippet: var x = 1; var y = 1; if (x == y) Console.Write("True"); Generates this MSIL: .locals init ( [0] int32 x, [1] int32 y, [2] bool CS$4$0000) L_0000: nop L_0001: ldc.i4.1 L_0002: stloc.0 L_0003: ldc.i4.1 L_0004: stloc.1 L_0005: ldloc.0 L_0006: ldloc.1 L_0007: ceq L_0009: ldc.i4.0 L_000a: ceq L_000c: stloc.2 L_000d: ldloc.2 L_000e: brtrue.s L_001b L_0010: ldstr "True" L_0015: call void [mscorlib]System.Console::Write(string) L_001a: nop L_001b: ret Why is there two ceq calls? Thanks

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  • Perl Script in PHP

    - by Sev
    I have a perl script, which takes a query string parameter, connects to a database and displays data. I'd like to include that script in a PHP file like so: include('perlscript.pl?item=302'); Such that the perl script's response is displayed on the PHP/HTML page. How can I do this?

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  • Switching DataSources in ReportViewer in WinForms

    - by Mike Wills
    I have created a winform for the users to view view the many reports I am creating for them. I have a drop down list with the report name which triggers the appropriate fields to display the parameters. Once those are filled, they press Submit and the report appears. This works the first time they hit the screen. They can change the parameters and the ReportViewer works fine. Change to a different report, and the I get the following ReportViewer error: An error occurred during local report processing. An error has occurred during the report processing. A data source instance has not been supplied for the data source "CgTempData_BusMaintenance". As far as the process I use: I set reportName (string) the physical RDLC name. I set the dataSource (string) as the DataSource Name I fill a generic DataTable with the data for the report to run from. Make the ReportViewer visible Set the LocalReport.ReportPath = "Reports\\" = reportName; Clear the LocalReport.DataSources.Clear() Add the new LocalReport.DataSources.Add(new ReportDataSource(dataSource, dt)); RefreshReport() on the ReportViewer. Here is the portion of the code that setups up and displays the ReportViewer: /// <summary> /// Builds the report. /// </summary> private void BuildReport() { DataTable dt = null; ReportingCG rcg = new ReportingCG(); if (reportName == "GasUsedReport.rdlc") { dataSource = "CgTempData_FuelLog"; CgTempData.FuelLogDataTable DtFuelLog = rcg.BuildFuelUsedTable(fromDate, toDate); dt = DtFuelLog; } else if (reportName == "InventoryCost.rdlc") { CgTempData.InventoryUsedDataTable DtInventory; dataSource = "CgTempData_InventoryUsed"; DtInventory = rcg.BuildInventoryUsedTable(fromDate, toDate); dt = DtInventory; } else if (reportName == "VehicleMasterList.rdlc") { dataSource = "CgTempData_VehicleMaster"; CgTempData.VehicleMasterDataTable DtVehicleMaster = rcg.BuildVehicleMasterTable(); dt = DtVehicleMaster; } else if (reportName == "BusCosts.rdlc") { dataSource = "CgTempData_BusMaintenance"; dt = rcg.BuildBusCostsTable(fromDate, toDate); } // Setup the DataSource this.reportViewer1.Visible = true; this.reportViewer1.LocalReport.ReportPath = "Reports\\" + reportName; this.reportViewer1.LocalReport.DataSources.Clear(); this.reportViewer1.LocalReport.DataSources.Add(new ReportDataSource(dataSource, dt)); this.reportViewer1.RefreshReport(); } Any ideas how to remove all of the old remaining data? Do I dispose the object and recreate it?

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