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• Extended SurfaceView's onDraw() method never called

  - by Gab Royer

  Hi, I'm trying to modify the SurfaceView I use for doing a camera preview in order to display an overlaying square. However, the onDraw method of the extended SurfaceView is never called. Here is the source : public class CameraPreviewView extends SurfaceView { protected final Paint rectanglePaint = new Paint(); public CameraPreviewView(Context context, AttributeSet attrs) { super(context, attrs); rectanglePaint.setARGB(255, 200, 0, 0); rectanglePaint.setStyle(Paint.Style.FILL); rectanglePaint.setStrokeWidth(2); } @Override protected void onDraw(Canvas canvas){ canvas.drawRect(new Rect(10,10,200,200), rectanglePaint); Log.w(this.getClass().getName(), "On Draw Called"); } } public class CameraPreview extends Activity implements SurfaceHolder.Callback{ private SurfaceHolder holder; private Camera camera; @Override protected void onCreate(Bundle savedInstanceState){ super.onCreate(savedInstanceState); // We remove the status bar, title bar and make the application fullscreen requestWindowFeature(Window.FEATURE_NO_TITLE); getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN, WindowManager.LayoutParams.FLAG_FULLSCREEN); // We set the content view to be the layout we made setContentView(R.layout.camera_preview); // We register the activity to handle the callbacks of the SurfaceView CameraPreviewView surfaceView = (CameraPreviewView) findViewById(R.id.camera_surface); holder = surfaceView.getHolder(); holder.addCallback(this); holder.setType(SurfaceHolder.SURFACE_TYPE_PUSH_BUFFERS); } public void surfaceChanged(SurfaceHolder holder, int format, int width, int height) { Camera.Parameters params = camera.getParameters(); params.setPreviewSize(width, height); camera.setParameters(params); try { camera.setPreviewDisplay(holder); } catch (IOException e) { e.printStackTrace(); } camera.startPreview(); } public void surfaceCreated(SurfaceHolder holder) { camera = Camera.open(); } public void surfaceDestroyed(SurfaceHolder holder) { camera.stopPreview(); camera.release(); } }

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• Parsing concatenated, non-delimited XML messages from TCP-stream using C#

  - by thaller

  I am trying to parse XML messages which are send to my C# application over TCP. Unfortunately, the protocol can not be changed and the XML messages are not delimited and no length prefix is used. Moreover the character encoding is not fixed but each message starts with an XML declaration <?xml>. The question is, how can i read one XML message at a time, using C#. Up to now, I tried to read the data from the TCP stream into a byte array and use it through a MemoryStream. The problem is, the buffer might contain more than one XML messages or the first message may be incomplete. In these cases, I get an exception when trying to parse it with XmlReader.Read or XmlDocument.Load, but unfortunately the XmlException does not really allow me to distinguish the problem (except parsing the localized error string). I tried using XmlReader.Read and count the number of Element and EndElement nodes. That way I know when I am finished reading the first, entire XML message. However, there are several problems. If the buffer does not yet contain the entire message, how can I distinguish the XmlException from an actually invalid, non-well-formed message? In other words, if an exception is thrown before reading the first root EndElement, how can I decide whether to abort the connection with error, or to collect more bytes from the TCP stream? If no exception occurs, the XmlReader is positioned at the start of the root EndElement. Casting the XmlReader to IXmlLineInfo gives me the current LineNumber and LinePosition, however it is not straight forward to get the byte position where the EndElement really ends. In order to do that, I would have to convert the byte array into a string (with the encoding specified in the XML declaration), seek to LineNumber,LinePosition and convert that back to the byte offset. I try to do that with StreamReader.ReadLine, but the stream reader gives no public access to the current byte position. All this seams very inelegant and non robust. I wonder if you have ideas for a better solution. Thank you. EDIT: I looked around and think that the situation is as follows (I might be wrong, corrections are welcome): I found no method so that the XmlReader can continue parsing a second XML message (at least not, if the second message has an XmlDeclaration). XmlTextReader.ResetState could do something similar, but for that I would have to assume the same encoding for all messages. Therefor I could not connect the XmlReader directly to the TcpStream. After closing the XmlReader, the buffer is not positioned at the readers last position. So it is not possible to close the reader and use a new one to continue with the next message. I guess the reason for this is, that the reader could not successfully seek on every possible input stream. When XmlReader throws an exception it can not be determined whether it happened because of an premature EOF or because of a non-wellformed XML. XmlReader.EOF is not set in case of an exception. As workaround I derived my own MemoryBuffer, which returns the very last byte as a single byte. This way I know that the XmlReader was really interested in the last byte and the following exception is likely due to a truncated message (this is kinda sloppy, in that it might not detect every non-wellformed message. However, after appending more bytes to the buffer, sooner or later the error will be detected. I could cast my XmlReader to the IXmlLineInfo interface, which gives access to the LineNumber and the LinePosition of the current node. So after reading the first message I remember these positions and use it to truncate the buffer. Here comes the really sloppy part, because I have to use the character encoding to get the byte position. I am sure you could find test cases for the code below where it breaks (e.g. internal elements with mixed encoding). But up to now it worked for all my tests. The parser class follows here -- may it be useful (I know, its very far from perfect...) class XmlParser { private byte[] buffer = new byte[0]; public int Length { get { return buffer.Length; } } // Append new binary data to the internal data buffer... public XmlParser Append(byte[] buffer2) { if (buffer2 != null && buffer2.Length > 0) { // I know, its not an efficient way to do this. // The EofMemoryStream should handle a List<byte[]> ... byte[] new_buffer = new byte[buffer.Length + buffer2.Length]; buffer.CopyTo(new_buffer, 0); buffer2.CopyTo(new_buffer, buffer.Length); buffer = new_buffer; } return this; } // MemoryStream which returns the last byte of the buffer individually, // so that we know that the buffering XmlReader really locked at the last // byte of the stream. // Moreover there is an EOF marker. private class EofMemoryStream: Stream { public bool EOF { get; private set; } private MemoryStream mem_; public override bool CanSeek { get { return false; } } public override bool CanWrite { get { return false; } } public override bool CanRead { get { return true; } } public override long Length { get { return mem_.Length; } } public override long Position { get { return mem_.Position; } set { throw new NotSupportedException(); } } public override void Flush() { mem_.Flush(); } public override long Seek(long offset, SeekOrigin origin) { throw new NotSupportedException(); } public override void SetLength(long value) { throw new NotSupportedException(); } public override void Write(byte[] buffer, int offset, int count) { throw new NotSupportedException(); } public override int Read(byte[] buffer, int offset, int count) { count = Math.Min(count, Math.Max(1, (int)(Length - Position - 1))); int nread = mem_.Read(buffer, offset, count); if (nread == 0) { EOF = true; } return nread; } public EofMemoryStream(byte[] buffer) { mem_ = new MemoryStream(buffer, false); EOF = false; } protected override void Dispose(bool disposing) { mem_.Dispose(); } } // Parses the first xml message from the stream. // If the first message is not yet complete, it returns null. // If the buffer contains non-wellformed xml, it ~should~ throw an exception. // After reading an xml message, it pops the data from the byte array. public Message deserialize() { if (buffer.Length == 0) { return null; } Message message = null; Encoding encoding = Message.default_encoding; //string xml = encoding.GetString(buffer); using (EofMemoryStream sbuffer = new EofMemoryStream (buffer)) { XmlDocument xmlDocument = null; XmlReaderSettings settings = new XmlReaderSettings(); int LineNumber = -1; int LinePosition = -1; bool truncate_buffer = false; using (XmlReader xmlReader = XmlReader.Create(sbuffer, settings)) { try { // Read to the first node (skipping over some element-types. // Don't use MoveToContent here, because it would skip the // XmlDeclaration too... while (xmlReader.Read() && (xmlReader.NodeType==XmlNodeType.Whitespace || xmlReader.NodeType==XmlNodeType.Comment)) { }; // Check for XML declaration. // If the message has an XmlDeclaration, extract the encoding. switch (xmlReader.NodeType) { case XmlNodeType.XmlDeclaration: while (xmlReader.MoveToNextAttribute()) { if (xmlReader.Name == "encoding") { encoding = Encoding.GetEncoding(xmlReader.Value); } } xmlReader.MoveToContent(); xmlReader.Read(); break; } // Move to the first element. xmlReader.MoveToContent(); // Read the entire document. xmlDocument = new XmlDocument(); xmlDocument.Load(xmlReader.ReadSubtree()); } catch (XmlException e) { // The parsing of the xml failed. If the XmlReader did // not yet look at the last byte, it is assumed that the // XML is invalid and the exception is re-thrown. if (sbuffer.EOF) { return null; } throw e; } { // Try to serialize an internal data structure using XmlSerializer. Type type = null; try { type = Type.GetType("my.namespace." + xmlDocument.DocumentElement.Name); } catch (Exception e) { // No specialized data container for this class found... } if (type == null) { message = new Message(); } else { // TODO: reuse the serializer... System.Xml.Serialization.XmlSerializer ser = new System.Xml.Serialization.XmlSerializer(type); message = (Message)ser.Deserialize(new XmlNodeReader(xmlDocument)); } message.doc = xmlDocument; } // At this point, the first XML message was sucessfully parsed. // Remember the lineposition of the current end element. IXmlLineInfo xmlLineInfo = xmlReader as IXmlLineInfo; if (xmlLineInfo != null && xmlLineInfo.HasLineInfo()) { LineNumber = xmlLineInfo.LineNumber; LinePosition = xmlLineInfo.LinePosition; } // Try to read the rest of the buffer. // If an exception is thrown, another xml message appears. // This way the xml parser could tell us that the message is finished here. // This would be prefered as truncating the buffer using the line info is sloppy. try { while (xmlReader.Read()) { } } catch { // There comes a second message. Needs workaround for trunkating. truncate_buffer = true; } } if (truncate_buffer) { if (LineNumber < 0) { throw new Exception("LineNumber not given. Cannot truncate xml buffer"); } // Convert the buffer to a string using the encoding found before // (or the default encoding). string s = encoding.GetString(buffer); // Seek to the line. int char_index = 0; while (--LineNumber > 0) { // Recognize \r , \n , \r\n as newlines... char_index = s.IndexOfAny(new char[] {'\r', '\n'}, char_index); // char_index should not be -1 because LineNumber>0, otherwise an RangeException is // thrown, which is appropriate. char_index++; if (s[char_index-1]=='\r' && s.Length>char_index && s[char_index]=='\n') { char_index++; } } char_index += LinePosition - 1; var rgx = new System.Text.RegularExpressions.Regex(xmlDocument.DocumentElement.Name + "[ \r\n\t]*\\>"); System.Text.RegularExpressions.Match match = rgx.Match(s, char_index); if (!match.Success || match.Index != char_index) { throw new Exception("could not find EndElement to truncate the xml buffer."); } char_index += match.Value.Length; // Convert the character offset back to the byte offset (for the given encoding). int line1_boffset = encoding.GetByteCount(s.Substring(0, char_index)); // remove the bytes from the buffer. buffer = buffer.Skip(line1_boffset).ToArray(); } else { buffer = new byte[0]; } } return message; } }

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• JSF 2.0: use Enum values for selectOneMenu

  - by yournamehere

  I'm using JSF 2.0 and want to fill a selectOneMenu with the values of my Enum. A simple example: // Sample Enum public enum Gender { MALE("Male"), FEMALE("Female"); private final String label; private Gender(String label) { this.label = label; } public String getLabel() { return this.label; } } Unfortunately, i can't use Seam for my current project, which had a nice <s:convertEnum/> Tag that did most of the work. In Seam, to use the values of the Enum, i had to write the following markup (and create a factory that provides the #{genderValues}: <!-- the Seam way --> <h:selectOneMenu id="persongender" value="#{person.gender}"> <s:selectItems var="_gender" value="#{genderValues}"" label="#{_gender.label}"/> <s:convertEnum/> </h:selectOneMenu> The result is that i don't have to declare the Enum values explicitely anymore inside the markup. I know that this is not very easy in JSF <2.0, but is there any new in JSF2 to help with this issue? Or does Weld help here somehow? If there is nothing new in JSF2, what's the easiest way to do it in JSF 1.2? Or can i even integrate the Seam JSF tag and the corresponding classes of Seam to get the same feature in a JavaEE6-App (without the Seam container)?

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• Trying to draw a Rectangle to a Custom Container in Flex4/AS3

  - by Parris

  So below is the code I have so far. For now I simply want to make it draw a square and have it show up. Right now when I click the area defined in MXML as <components:PaintArea width="100%" height="100%" id="paint-a"></PaintArea> it shows nothing; however, the actionlistener is getting triggered and an element is being added to the group. Not sure exactly what is going on... perhaps for some reason it doesn't think the element is drawable? Anyways thanks for the help! public class PaintArea extends SkinnableContainer { private var canvas:Group; public function PaintArea() { super(); canvas = new Group(); canvas.clipAndEnableScrolling = true; canvas.percentHeight = 100; canvas.percentWidth = 100; canvas.addEventListener(MouseEvent.MOUSE_UP,drawRectangle); this.addElement(canvas); } private function drawRectangle(e:MouseEvent):void{ var r:Rect = new Rect(); r.fill = new SolidColor(0x00ff00,.5); canvas.addElement(r); } }

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• Making a mini paint area in AS3/Flex4

  - by Parris

  So below is the code I have so far. For now I simply want to make it draw a square and have it show up. Right now when I click the area defined in MXML as <components:PaintArea width="100%" height="100%" id="paint-a"></PaintArea> it shows nothing; however, the actionlistener is getting triggered and an element is being added to the group. Not sure exactly what is going on... perhaps for some reason it doesn't think the element is drawable? Anyways thanks for the help! public class PaintArea extends SkinnableContainer { private var canvas:Group; public function PaintArea() { super(); canvas = new Group(); canvas.clipAndEnableScrolling = true; canvas.percentHeight = 100; canvas.percentWidth = 100; canvas.addEventListener(MouseEvent.MOUSE_UP,drawRectangle); this.addElement(canvas); } private function drawRectangle(e:MouseEvent):void{ var r:Rect = new Rect(); r.fill = new SolidColor(0x00ff00,.5); canvas.addElement(r); } }

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• What might cause this ExecutionEngineException?

  - by Qwertie

  I am trying to use Reflection.Emit to generate a wrapper class in a dynamic assembly. Automatic wrapper generation is part of a new open-source library I'm writing called "GoInterfaces". The wrapper class implements IEnumerable<string> and wraps List<string>. In C# terms, all it does is this: class List1_7931B0B4_79328AA0 : IEnumerable<string> { private readonly List<string> _obj; public List1_7931B0B4_79328AA0(List<string> obj) { this._obj = obj; } IEnumerator IEnumerable.GetEnumerator() { return this._obj.GetEnumerator(); } public sealed IEnumerator<string> GetEnumerator() { return this._obj.GetEnumerator(); } } However, when I try to call the GetEnumerator() method on my wrapper class, I get ExecutionEngineException. So I saved my dynamic assembly to a DLL and used ildasm on it. Is there anything wrong with the following code? .class public auto ansi sealed List`1_7931B0B4_79328AA0 extends [mscorlib]System.Object implements [mscorlib]System.Collections.Generic.IEnumerable`1<string>, [Loyc.Runtime]Loyc.Runtime.IGoInterfaceWrapper { .field private initonly class [mscorlib]System.Collections.Generic.List`1<string> _obj .method public hidebysig virtual final instance class [mscorlib]System.Collections.Generic.IEnumerator`1<string> GetEnumerator() cil managed { // Code size 12 (0xc) .maxstack 1 IL_0000: ldarg.0 IL_0001: ldfld class [mscorlib]System.Collections.Generic.List`1<string> List`1_7931B0B4_79328AA0::_obj IL_0006: call instance valuetype [mscorlib]System.Collections.Generic.List`1/Enumerator<!0> class [mscorlib]System.Collections.Generic.List`1<string>::GetEnumerator() IL_000b: ret } // end of method List`1_7931B0B4_79328AA0::GetEnumerator .method public hidebysig virtual final instance class [mscorlib]System.Collections.IEnumerator System.Collections.IEnumerable.GetEnumerator() cil managed { .override [mscorlib]System.Collections.IEnumerable::GetEnumerator // Code size 12 (0xc) .maxstack 1 IL_0000: ldarg.0 IL_0001: ldfld class [mscorlib]System.Collections.Generic.List`1<string> List`1_7931B0B4_79328AA0::_obj IL_0006: call instance valuetype [mscorlib]System.Collections.Generic.List`1/Enumerator<!0> class [mscorlib]System.Collections.Generic.List`1<string>::GetEnumerator() IL_000b: ret } // end of method List`1_7931B0B4_79328AA0::System.Collections.IEnumerable.GetEnumerator ... I have a test suite that wraps all sorts of different things, including interfaces derived from other interfaces, and multiple interface methods with identical signatures. It's only when I try to wrap IEnumerable<T> that this problem occurs. I'd be happy to send the source code (2 *.cs files, no dependencies) if anyone would like.

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• ASP.NET MVC async call a WCF service.

  - by mmcteam

  Hi all. After complete of asynchronous call to WCF service I want set success message into session and show user the notification . I tried use two ways for complete this operation. 1) Event Based Model. client.GetDataCompleted += new EventHandler<GetDataCompletedEventArgs>(GetDataCompleted); client.GetDataAsync(id, client); private void GetDataCompleted(object obj, GetDataCompletedEventArgs e) { this.SetNotification(new Notification() { Message = e.Result, Type = NotificationType.Success }); } In MyOperationCompleted event i can set notification to HttpContext.Current.Session, but I must waiting before this operation will completed and can't navigate to others pages. 2) IAsyncResult Model. client.BeginGetData(id, GetDataCallback, client); private void GetDataCallback(IAsyncResult ar) { string name = ((ServiceReference1.Service1Client)ar.AsyncState).EndGetData(ar); this.SetNotification(new Notification() { Message = name, Type = NotificationType.Success }); } "Generate asynchronous operations" in service reference enabled. Please help me with this trouble. I novice in ASP.NET MVC. Thanks.

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• C# PrintPreviewDialog Modification possible?

  - by C. Griffin

  Currently, what I'm doing is this: Using the built-in .NET PrintPreviewDialog Attaching my own Click handler to the Print button, which allows for the user to select the printer before finally printing. This all WORKS, HOWEVER, the OnprintToolStripButtonClick event is still sending the document to the default printer BEFORE the user gets to choose the actual printer and click Print (which works, but they're getting an extra copy on the default printer first from the old Handler). Can I remove this built-in Click handler? I've tried the other methods mentioned on here in regards to using an EventHandlerList to remove the handlers, but it doesn't work for the built-in printing event. Here is a copy of my current code in case it helps clarify: // ... Irrelevant code before this private PrintPreviewDialog ppdlg; ToolStrip ts = new ToolStrip(); ts.Name = "wrongToolStrip"; foreach (Control ctl in ppdlg.Controls) { if (ctl.Name.Equals("toolStrip1")) { ts = ctl as ToolStrip; break; } } ToolStripButton printButton = new ToolStripButton(); foreach (ToolStripItem tsi in ts.Items) { if (tsi.Name.Equals("printToolStripButton")) { printButton = tsi as ToolStripButton; } } printButton.Click += new EventHandler(this.SelectPrinterAfterPreview); // ... Irrelevant code afterwards omitted // Here is the Handler for choosing a Printer that gets called after the // PrintPreviewDialog's "Print" button is clicked. private void SelectPrinterAfterPreview(object sender, EventArgs e) { frmMainPage frmMain = (frmMainPage)this.MdiParent; if (frmMain.printDialog1.ShowDialog() == DialogResult.OK) { pd.PrinterSettings.PrinterName = frmMain.printDialog1.PrinterSettings.PrinterName; pd.PrinterSettings.Copies = frmMain.printDialog1.PrinterSettings.Copies; pd.Print(); } }

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• How to clone objects in NHibernate?

  - by Anry

  How to implement cloning of objects (entities) in NHibernate? In the classes of entities has properties such public virtual IList<Club> Clubs { get; set; } All classes are inherited from BaseObject. I tried to implement using xml serialization, but the interfaces are not serialized. Thank you for your answers!

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• not enough actual parameters ?

  - by omair iqbal

  The following program returns error : e2035 not enough actual parameters in 2 places (lines 39 and 45) and is not compiling. Can someone please help me out? Can I put 0 or null in place of parameters here? unit Unit1; interface uses Windows, Messages, SysUtils, Variants, Classes, Graphics, Controls, Forms, Dialogs,ComObj,shdocvw,activex, StdCtrls; type TForm1 = class(TForm) Button1: TButton; procedure Button1Click(Sender: TObject); private { Private declarations } public { Public declarations } end; var Form1: TForm1; implementation {$R *.dfm} procedure TForm1.Button1Click(Sender: TObject); var mybrowser : iwebbrowser2; myUserName, myPassword,loginURL : string; Flags: OleVariant; begin Flags := navOpenInNewWindow; MyBrowser := CreateOleObject('InternetExplorer.Application') as IWebBrowser2; MyBrowser.Navigate('http://www.gmail.com',flags,'_blank'); myUserName := 'UserName'; myPassword := 'password'; loginURL:='javascript:var Email = document.getElementById(''Email'');Email.value=''' + myUserName + ''';var Password = document.getElementById(''Passwd'');Password.value=''' + myPassword + ''';var SignIn = document.getElementById(''signIn'');SignIn.click();'; MyBrowser.Navigate(loginURL); end; end.

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• Problem with Mapping Linq-to-Sql on different Types

  - by csharpnoob

  Hi, maybe someone can help. I want to have on mapped Linq-Class different Datatype. This is working: private System.Nullable<short> _deleted = 1; [Column(Storage = "_deleted", Name = "deleted", DbType = "SmallInt", CanBeNull = true)] public System.Nullable<short> deleted { get { return this._deleted; } set { this._deleted = value; } } Sure thing. But no when i want to place some logic for boolean, like this: private System.Nullable<short> _deleted = 1; [Column(Storage = "_deleted", Name = "deleted", DbType = "SmallInt", CanBeNull = true)] public bool deleted { get { if (this._deleted == 1) { return true; } return false; } set { if(value == true) { this._deleted = (short)1; }else { this._deleted = (short)0; } } } I get always runtime error: [TypeLoadException: GenericArguments[2], "System.Nullable`1[System.Int16]", on 'System.Data.Linq.Mapping.PropertyAccessor+Accessor`3[T,V,V2]' violates the constraint of type parameter 'V2'.] I can't change the database to bit.. I need to have casting in mapping class.

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• In Java Concurrency In Practice by Brian Goetz, why is the Memoizer class not annotated with @ThreadSafe?

  - by dig_dug

  Java Concurrency In Practice by Brian Goetz provides an example of a efficient scalable cache for concurrent use. The final version of the example showing the implementation for class Memoizer (pg 108) shows such a cache. I am wondering why the class is not annotated with @ThreadSafe? The client, class Factorizer, of the cache is properly annotated with @ThreadSafe. The appendix states that if a class is not annotated with either @ThreadSafe or @Immutable that it should be assumed that it isn't thread safe. Memoizer seems thread-safe though. Here is the code for Memoizer: public class Memoizer<A, V> implements Computable<A, V> { private final ConcurrentMap<A, Future<V>> cache = new ConcurrentHashMap<A, Future<V>>(); private final Computable<A, V> c; public Memoizer(Computable<A, V> c) { this.c = c; } public V compute(final A arg) throws InterruptedException { while (true) { Future<V> f = cache.get(arg); if (f == null) { Callable<V> eval = new Callable<V>() { public V call() throws InterruptedException { return c.compute(arg); } }; FutureTask<V> ft = new FutureTask<V>(eval); f = cache.putIfAbsent(arg, ft); if (f == null) { f = ft; ft.run(); } } try { return f.get(); } catch (CancellationException e) { cache.remove(arg, f); } catch (ExecutionException e) { throw launderThrowable(e.getCause()); } } } }

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• Custom ViewModel with MVC 2 Strongly Typed HTML Helpers return null object on Create ?

  - by Barbaros Alp

  Hi, I am having a trouble while trying to create an entity with a custom view modeled create form. Below is my custom view model for Category Creation form. public class CategoryFormViewModel { public CategoryFormViewModel(Category category, string actionTitle) { Category = category; ActionTitle = actionTitle; } public Category Category { get; private set; } public string ActionTitle { get; private set; } } and this is my user control where the UI is <%@ Control Language="C#" Inherits="System.Web.Mvc.ViewUserControl<CategoryFormViewModel>" %> <h2> <span><%= Html.Encode(Model.ActionTitle) %></span> </h2> <%=Html.ValidationSummary() %> <% using (Html.BeginForm()) {%> <p> <span class="bold block">Baslik:</span> <%=Html.TextBoxFor(model => Model.Category.Title, new { @class = "width80 txt-base" })%> </p> <p> <span class="bold block">Sira Numarasi:</span> <%=Html.TextBoxFor(model => Model.Category.OrderNo, new { @class = "width10 txt-base" })%> </p> <p> <input type="submit" class="btn-admin cursorPointer" value="Save" /> </p> <% } %> When i click on save button, it doesnt bind the category for me because of i am using custom view model and strongly typed html helpers like that <%=Html.TextBoxFor(model => Model.Category.OrderNo) %> How can i fix this ? Thanks in advance

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• Logic inside an enum

  - by Vivin Paliath

  My colleagues and I were having a discussion regarding logic in enums. My personal preference is to not have any sort of logic in Java enums (although Java provides the ability to do that). The discussion in this cased centered around having a convenience method inside the enum that returned a map: public enum PackageTypes { Letter("01", "Letter"), .. .. Tube("02", "Packaging Tube"); private String packageCode; private String packageDescription; .. .. public static Map<String, String> toMap() { Map<String, String> map = new LinkedHashMap<String, String>(); for(PackageType packageType : PackageType.values()) { map.put(packageType.getPackageCode(), packageType.getPackageDescription()); } return map; } } My personal preference is to pull this out into a service. The argument for having the method inside the enum centered around convenience. The idea was that you don't have to go to a service to get it, but can query the enum directly. My argument centered around separation of concern and abstracting any kind of logic out to a service. I didn't think "convenience" was a strong argument to put this method inside an enum. From a best-practices perspective, which one is better? Or does it simply come down to a matter of personal preference and code style?

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• Maven Assembly Plugin - install the created assembly

  - by Walter White

  I have a project that simply consists of files. I want to package those files into a zip and store them in a maven repository. I have the assembly plugin configured to build the zip file and that part works just fine, but I cannot seem to figure out how to install the zip file? Also, if I want to use this assembly in another artifact, how would I do that? I am intending on calling dependency:unpack, but I don't have an artifact in the repository to unpack. How can I get a zip file to be in my repository so that I may re-use it in another artifact? parent pom <build> <plugins> <plugin> <!--<groupId>org.apache.maven.plugins</groupId>--> <artifactId>maven-assembly-plugin</artifactId> <version>2.2-beta-5</version> <configuration> <filters> <filter></filter> </filters> <descriptors> <descriptor>../packaging.xml</descriptor> </descriptors> </configuration> </plugin> </plugins> </build> Child POM <parent> <groupId>com. ... .virtualHost</groupId> <artifactId>pom</artifactId> <version>0.0.1</version> <relativePath>../pom.xml</relativePath> </parent> <name>Virtual Host - ***</name> <groupId>com. ... .virtualHost</groupId> <artifactId>***</artifactId> <version>0.0.1</version> <packaging>pom</packaging> I filtered the name out. Is this POM correct? I just want to bundle files for a particular virtual host together. Thanks, Walter

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• " not all code paths return a value" when return enum type

  - by netmajor

  I have enum list and method and i get error: " not all code paths return a value" Some idea whats wrong in my method ? I am sure I always return STANY type :/ Thanks for help :) private enum STANY { PATROL, CHAT, EAT, SEARCH, DIE }; private STANY giveState(int id, List<Ludek> gracze, List<int> plansza) { // Sprawdz czy gracz stoi na polu z jedzeniem i nie ma 2000 jednostek jedzenia bool onTheFood = false; onTheFood = CzyPoleZjedzeniem(id, gracze, plansza, onTheFood); if (onTheFood && (gracze[id].IloscJedzenia < startFood / 2)) return STANY.EAT; // Sprawdz czy gracz nie stoi na polu z innym graczem bool allKnowledge = true; allKnowledge = CzyPoleZInnymGraczem(id, gracze, allKnowledge); if (!allKnowledge) return STANY.CHAT; // Jesli ma ponad i rowna ilosc jedzenia patroluj if (gracze[id].IloscJedzenia >= startFood / 2) return STANY.PATROL; // Jesli ma mniej niz polowe jedzenia szukaj jedzenia if (gracze[id].IloscJedzenia > 0 && gracze[id].IloscJedzenia < startFood / 2) return STANY.SEARCH; // Jesli nie ma jedzenia umieraj if (gracze[id].IloscJedzenia <= 0) return STANY.DIE; }

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• Android Client : Web service - what's the correct SOAP_ACTION, METHOD_NAME, NAMESPACE, URL I should

  - by Hubert

  if I want to use the following Web service (help.be is just an example, let's say it does exist): http://www.help.be/webservice/webservice_help.php (it's written in PHP=client's choice, not .NET) with the following WSDL : <?xml version="1.0" encoding="UTF-8"?> <definitions xmlns="http://schemas.xmlsoap.org/wsdl/" name="webservice_help" targetNamespace="http://www.help.be/webservice/webservice_help.php" xmlns:tns="http://www.help.be/webservice/webservice_help.php" xmlns:impl="http://www.help.be/webservice/webservice_help.php" xmlns:xsd1="http://www.help.be/webservice/webservice_help.php" xmlns:xsd="http://www.w3.org/2001/XMLSchema" xmlns:wsdl="http://schemas.xmlsoap.org/wsdl/" xmlns:soap="http://schemas.xmlsoap.org/wsdl/soap/" xmlns:soapenc="http://schemas.xmlsoap.org/soap/encoding/"> <portType name="webservice_helpPortType"> <operation name="webservice_help"> <input message="tns:Webservice_helpRequest"/> </operation> <operation name="getLocation" parameterOrder="input"> <input message="tns:GetLocationRequest"/> <output message="tns:GetLocationResponse"/> </operation> <operation name="getStationDetail" parameterOrder="input"> <input message="tns:GetStationDetailRequest"/> <output message="tns:GetStationDetailResponse"/> </operation> <operation name="getStationList" parameterOrder="input"> <input message="tns:GetStationListRequest"/> <output message="tns:GetStationListResponse"/> </operation> </portType> <binding name="webservice_helpBinding" type="tns:webservice_helpPortType"> <soap:binding style="rpc" transport="http://schemas.xmlsoap.org/soap/http"/> <operation name="webservice_help"> <soap:operation soapAction="urn:webservice_help#webservice_helpServer#webservice_help"/> <input> <soap:body use="encoded" namespace="http://www.help.be/webservice/webservice_help.php" encodingStyle="http://schemas.xmlsoap.org/soap/encoding/"/> </input> </operation> <operation name="getLocation"> <soap:operation soapAction="urn:webservice_help#webservice_helpServer#getLocation"/> <input> <soap:body parts="input" use="encoded" namespace="http://www.help.be/webservice/webservice_help.php" encodingStyle="http://schemas.xmlsoap.org/soap/encoding/"/> </input> <output> <soap:body parts="return" use="encoded" namespace="http://www.help.be/webservice/webservice_help.php" encodingStyle="http://schemas.xmlsoap.org/soap/encoding/"/> </output> </operation> <operation name="getStationDetail"> <soap:operation soapAction="urn:webservice_help#webservice_helpServer#getStationDetail"/> <input> <soap:body parts="input" use="encoded" namespace="http://www.help.be/webservice/webservice_help.php" encodingStyle="http://schemas.xmlsoap.org/soap/encoding/"/> </input> <output> <soap:body parts="return" use="encoded" namespace="http://www.help.be/webservice/webservice_help.php" encodingStyle="http://schemas.xmlsoap.org/soap/encoding/"/> </output> </operation> <operation name="getStationList"> <soap:operation soapAction="urn:webservice_help#webservice_helpServer#getStationList"/> <input> <soap:body parts="input" use="encoded" namespace="http://www.help.be/webservice/webservice_help.php" encodingStyle="http://schemas.xmlsoap.org/soap/encoding/"/> </input> <output> <soap:body parts="return" use="encoded" namespace="http://www.help.be/webservice/webservice_help.php" encodingStyle="http://schemas.xmlsoap.org/soap/encoding/"/> </output> </operation> </binding> <message name="Webservice_helpRequest"/> <message name="GetLocationRequest"> <part name="input" type="xsd:array"/> </message> <message name="GetLocationResponse"> <part name="return" type="xsd:array"/> </message> <message name="GetStationDetailRequest"> <part name="input" type="xsd:array"/> </message> <message name="GetStationDetailResponse"> <part name="return" type="xsd:string"/> </message> <message name="GetStationListRequest"> <part name="input" type="xsd:array"/> </message> <message name="GetStationListResponse"> <part name="return" type="xsd:string"/> </message> <service name="webservice_helpService"> <port name="webservice_helpPort" binding="tns:webservice_helpBinding"> <soap:address location="http://www.help.be/webservice/webservice_help.php"/> </port> </service> </definitions> What is the correct SOAP_ACTION, METHOD_NAME, NAMESPACE, URL I should use below ? I've tried with this : public class Main extends Activity { /** Called when the activity is first created. */ private static final String SOAP_ACTION_GETLOCATION = "getLocation"; private static final String METHOD_NAME_GETLOCATION = "getLocation"; private static final String NAMESPACE = "http://www.help.be/webservice/"; private static final String URL = "http://www.help.be/webservice/webservice_help.php"; TextView tv; @SuppressWarnings("unchecked") @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.main); tv = (TextView)findViewById(R.id.TextView01); // -------------------------------------------------------------------------------------- SoapObject request_location = new SoapObject(NAMESPACE, METHOD_NAME_GETLOCATION); request_location.addProperty("login", "login"); // -> string required request_location.addProperty("password", "password"); // -> string required request_location.addProperty("serial", "serial"); // -> string required request_location.addProperty("language", "fr"); // -> string required (available « fr,nl,uk,de ») request_location.addProperty("keyword", "Braine"); // -> string required // -------------------------------------------------------------------------------------- SoapSerializationEnvelope soapEnvelope = new SoapSerializationEnvelope(SoapEnvelope.VER11); //soapEnvelope.dotNet = true; // don't forget it for .NET WebServices ! soapEnvelope.setOutputSoapObject(request_location); AndroidHttpTransport aht = new AndroidHttpTransport(URL); try { aht.call(SOAP_ACTION_GETLOCATION, soapEnvelope); // Get the SAOP Envelope back and then extract the body SoapObject resultsRequestSOAP = (SoapObject) soapEnvelope.bodyIn; Vector XXXX = (Vector) resultsRequestSOAP.getProperty("GetLocationResponse"); int vector_size = XXXX.size(); Log.i("Hub", "testat="+vector_size); tv.setText("OK"); } catch(Exception E) { tv.setText("ERROR:" + E.getClass().getName() + ": " + E.getMessage()); Log.i("Hub", "Exception E"); Log.i("Hub", "E.getClass().getName()="+E.getClass().getName()); Log.i("Hub", "E.getMessage()="+E.getMessage()); } // -------------------------------------------------------------------------------------- } } I'm not sure of the SOAP_ACTION, METHOD_NAME, NAMESPACE, URL I have to use? because soapAction is pointing to a URN instead of a traditional URL and it's PHP and not .NET ... also, I'm not sure if I have to use request_location.addProperty("login", "login"); of request_location.addAttribute("login", "login"); ? = <message name="GetLocationRequest"> <part name="input" type="xsd:array"/> What would you say ? Txs for your help. H. EDIT : Here is some code working in PHP - I simply want to have the same but in Android/JAVA : <?php ini_set("soap.wsdl_cache_enabled", "0"); // disabling WSDL cache $request['login'] = 'login'; $request['password'] = 'password'; $request['serial'] = 'serial'; $request['language'] = 'fr'; $client= new SoapClient("http://www.test.be/webservice/webservice_test.wsdl"); print_r( $client->__getFunctions()); ?><hr><h1>getLocation</h1> <h2>Input:</h2> <? $request['keyword'] = 'Bruxelles'; print_r($request); ?><h2>Result</h2><? $result = $client->getLocation($request); print_r($result); ?>

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• How do I set up a public server on a network?

  - by tyjkenn

  I am trying to set up a personal cloud server with OwnCloud on Ubuntu. LAMP is all set up. I was able to access it using the external IP address when I connected it directly to the modem, but what if I what if I want my server to share a LAN? I still want it accessible over the internet, but then if I go to the IP address from a web browser, it just tries to log into to router admin tools. The internal IP address works across the LAN, but I want to be able to access it from anywhere. This may be simple and I may be over-thinking it, but how do access my server? The router I am using is ASUS WL-520GU.

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• Silverlight DataPager localization

  - by gius

  Is it possible to localize DataPager's footer (Page X of Y) in Silvelright? The strings seem to be located in resources embedded in the assembly of DataPager. So how should I localize it? Unfortunately, almost nothing in the DataPager class is virtual and also many internal classes are used by it, so it is not possible (at least easily) to inherit DataPager and override the behavior.

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• WCF NetTcpBinding Security - how does it work?

  - by RemotecUk

  Hi, encountered the following problems trying to work through the quagmire of settings in WCF... I created a WCF client server service using a NetTcp binding. I didn't make any changes to the security settings and when running on one machine it works very nicely. However, when I ran my client from another machine it complained that the server didnt like the security credentials that were sent. I understand now that NetTCP is "secured" by default and that my client would have been passing the wrong security details - namely the windows user name and password (or some form of domain authentication) to my server which as they are not running on the same domain it would not have liked. However, what I don't understand is as follows: I haven't specified any security in my binding - does the standard settings expect a windows user name or password to be sent? I don't have any certificate installed on my server - I understand that NetTCP bindings need some form of public private key to protect the credentials - yet this seemed to work when both client and server were on the same machine - how was the data getting encrypted? Or wants it as WCF knew it was on the same machine and encryption isn't needed? I have had to set my security mode on my client and server to "none" now and they connect nicely. However is there any way to encrypt my data without a certificate? Finally... what is the difference between Transport and Message security? To check my understanding (excuse the scenario!) message security is like if I sent a letter from person A to person B and I encode my hand writing to ensure that if anyone intercepts it they cannot read it? Transport Security is if I decide to have my letter sent by armed transport so that no one can get at it along the way? Is it possible to have any form of encryption in WCF without a certificate? My project is a private project and I dont want to purchase a certificate and the data isnt that sensitive anyway so its just for my own knowledge. Thanks in advance.

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• Cannot connect to Xen domU via VNC if X isn't installed on domU

  - by Hai Minh Nguyen

  I'm trying to build a Xen domU that can be connected through the Xen's VNC server. Below is the template (actually it's generated by OpenNebula): name = 'one-153' #O CPU_CREDITS = 256 memory = '128' bootloader = "/usr/bin/pygrub" disk = ['tap:aio:/home/oneadmin/cloud/one/var/153/images/disk.0,xvda,w',] vif = ['mac=02:00:c0:a8:00:03,bridge=virbr0',] vfb = ['type=vnc,vnclisten=slave1,vncdisplay=1,vncpasswd=v98KXdFN'] The problem is that I can't connect to the domU if it doesn't have X. In this case all I got is a blank screen. Besides, if the domU has X, the screen is still blank until the login prompt appears, while it should be like this. Some information that may be useful: The domU and the dom0 both run CentOS 5.5. If the domU has X, it can be connected even when both X and the domU's VNC server isn't running. The VNC client is RealVNC.

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• Generate BitmapSource from UIElement

  - by Joel

  I am attempting to generate a BitmapFrame that is based on a UIElement. Here is my function: private BitmapFrame RenderToBitmap2() { RenderTargetBitmap renderBitmap = new RenderTargetBitmap(200, 200, 96, 96, PixelFormats.Pbgra32); DrawingVisual drawingVisual = new DrawingVisual(); DrawingContext drawingContext = drawingVisual.RenderOpen(); VisualBrush aVisualBrush = new VisualBrush(GenerateTestStackPanel()); drawingContext.DrawRectangle(aVisualBrush, new Pen(Brushes.Green, 2), new Rect(new Size(150, 150))); drawingContext.Close(); renderBitmap.Render(drawingVisual); return BitmapFrame.Create(renderBitmap); } For testing and debugging purposes, I am using an additional function that creates a simple StackFrame that should create a valid visual element that can be represented: private StackPanel GenerateTestStackPanel() { // Create a red Ellipse. Ellipse myEllipse = new Ellipse(); myEllipse.Fill = Brushes.Green; myEllipse.StrokeThickness = 2; myEllipse.Stroke = Brushes.Black; // Set the width and height of the Ellipse. myEllipse.Width = 200; myEllipse.Height = 200; // Add the Ellipse to the StackPanel. StackPanel myStackPanel = new StackPanel(); myStackPanel.Children.Add(myEllipse); return myStackPanel; } For some reason, the VisualBrush is not being rendered in the DrawRetangle(...) function. I can see the green border but nothing else. In addition, if I swap out the VisualBrush with a standard brush, it works great: drawingContext.DrawRectangle(Brushes.Plum, new Pen(Brushes.Green, 2), new Rect(new Size(150, 150))); Thanks in advance! -Joel

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• Handling exception from unmanaged dll in C#

  - by StuffHappens

  Hello. I have the following function written in C# public static string GetNominativeDeclension(string surnameNamePatronimic) { if(surnameNamePatronimic == null) throw new ArgumentNullException("surnameNamePatronimic"); IntPtr[] ptrs = null; try { ptrs = StringsToIntPtrArray(surnameNamePatronimic); int resultLen = MaxResultBufSize; int err = decGetNominativePadeg(ptrs[0], ptrs[1], ref resultLen); ThrowException(err); return IntPtrToString(ptrs, resultLen); } catch { return surnameNamePatronimic; } finally { FreeIntPtr(ptrs); } } Function decGetNominativePadeg is in unmanaged dll [DllImport("Padeg.dll", EntryPoint = "GetNominativePadeg")] private static extern Int32 decGetNominativePadeg(IntPtr surnameNamePatronimic, IntPtr result, ref Int32 resultLength); and throws an exception: Attempted to read or write protected memory. This is often an indication that other memory is corrupt. The catch that is in C# code doesn't actually catch it. Why? How to handle this exception? Thank you for your help! UPDATED private static IntPtr[] StringsToIntPtrArray(params string[] strs) { IntPtr[] ptrs = new IntPtr[strs.Length + 1]; for(int i = 0; i < ptrs.Length - 1; i++) ptrs[i] = StringToIntPtr(strs[i]); ptrs[ptrs.Length - 1] = Marshal.AllocHGlobal(m_MaxResultStringBufSize); return ptrs; }

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• ICollectionView.SortDescriptions sort does not work if underlying DataTable has zero rows

  - by BigBlondeViking

  We have a WPF app that has a DataGrid inside a ListView. private DataTable table_; We do a bunch or dynamic column generation ( depending on the report we are showing ) We then do the a query and fill the DataTable row by row, this query may or may not have data.( not the problem, an empty grid is expected ) We set the ListView's ItemsSource to the DefaultView of the DataTable. lv.ItemsSource = table_.DefaultView; We then (looking at the user's pass usage of the app, set the sort on the column) Sort Method below: private void Sort(string sortBy, ListSortDirection direction) { ICollectionView dataView = CollectionViewSource.GetDefaultView(lv.ItemsSource); dataView.SortDescriptions.Clear(); var sd = new SortDescription(sortBy, direction); dataView.SortDescriptions.Add(sd); dataView.Refresh(); } In the Zero DataTable rows scenario, the sort does not "hold"? and if we dynamically add rows they will not be in sorted order. If the DataTable has at-least 1 row when the sort is applied, and we dynamically add rows to the DataTable, the rows com in sorted correctly. I have built a standalone app that replicate this... It is an annoyance and I can add a check to see if the DataTable was empty, and re-apply the sort... Anyone know whats going on here, and am I doing something wrong? FYI: What we based this off if comes from the MSDN as well: http://msdn.microsoft.com/en-us/library/ms745786.aspx

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• How to mass insert/update in linq to sql?

  - by chobo2

  Hi How can I do these 2 scenarios. Currently I am doing something like this public class Repository { private LinqtoSqlContext dbcontext = new LinqtoSqlContext(); public void Update() { // find record // update record // save record ( dbcontext.submitChanges() } public void Insert() { // make a database table object ( ie ProductTable t = new ProductTable() { productname ="something"} // insert record ( dbcontext.ProductTable.insertOnSubmit()) // dbcontext.submitChanges(); } } So now I am trying to load an XML file what has tons of records. First I validate the records one at a time. I then want to insert them into the database but instead of doing submitChanges() after each record I want to do a mass submit at the end. So I have something like this public class Repository { private LinqtoSqlContext dbcontext = new LinqtoSqlContext(); public void Update() { // find record // update record } public void Insert() { // make a database table object ( ie ProductTable t = new ProductTable() { productname ="something"} // insert record ( dbcontext.ProductTable.insertOnSubmit()) } public void SaveToDb() { dbcontext.submitChanges(); } } Then in my service layer I would do like for(int i = 0; i < 100; i++) { validate(); if(valid == true) { update(); insert() } } SaveToDb(); So pretend my for loop is has a count for all the record found in the xml file. I first validate it. If valid then I have to update a table before I insert the record. I then insert the record. After that I want to save everything in one go. I am not sure if I can do a mass save when updating of if that has to be after every time or what. But I thought it would work for sure for the insert one. Nothing seems to crash and I am not sure how to check if the records are being added to the dbcontext.

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