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• Professional jQuery based Combobox control?

  - by splattne

  Are there any professional Combobox controls (dropdown list with autosuggestion) based on the jQuery library? It should be able to handle large datasets and have some skinning options. A multi-column result list would be great too. I'm working with ASP.NET, but it's a not a problem if I had to write a wrapper for it. I'm already using a third-party control, but I ran into some compatibilty issues between two vendor's controls. Well, I want to get rid of this kind of dependencies.

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• Value of text box disapears - binding viewmodel to a tab (content control)

  - by Eli Perpinyal

  Based on the MVVM example by Josh Smith, I have implemented the multi tab option which binds to a different tab to a different view model using a simple datatemplate that binds a viewmodel to a view. <DataTemplate DataType="{x:Type fixtureVM:SearchViewModel}"> <SearchVw:SearchView/> </DataTemplate> The issue that I'm having, is when I switch tabs and then switch back again, the value in the textbox disappears. When I bind the Text in the textbox to a value in the ViewModel it does not disappear. This is fine, and I can overcome this but I am having another issue for example with the position of the scroll bar in a grid disappearing once the tab has lost focus. Why is the value disappearing? I'm assuming it is a WPF sub system task that cleans up resources!? how can I avoid this? I also feel it might be slowing down my app.

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• WPF and XPS: Empty Document Viewer

  - by xscape

  byte[] mediaBytes = Convert.FromBase64String("<<strings>>"); XpsDocument doc; ms = new MemoryStream(mediaBytes, 0, mediaBytes.Length); Uri DocumentUri = new Uri("pack://document.xps"); using (Package package = Package.Open(ms, FileMode.Create)) { PackageStore.AddPackage(DocumentUri, package); doc = new XpsDocument(package, CompressionOption.Maximum, DocumentUri.AbsoluteUri); FixedDocumentSequence fds = doc.GetFixedDocumentSequence(); documentViewer.Document = fds as IDocumentPaginatorSource; PackageStore.RemovePackage(DocumentUri); doc.Close(); } Can anyone please help me. Its result is an empty document. The mediaBytes is a PDF document.

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• MTU mismatch between GetIfEntry and netsh

  - by ChrisJ

  I'm working on pseudo-transport layer software that runs over UDP, providing reliable connection-oriented transmission, as an alternative to TCP. In order to maximize network efficiency, we query the MTU of the "best" network adapter upon initialization. MIB_IFROW row = {0}; row.dwIndex = dwBestIfIndex; dwRes = GetIfEntry(&row); Searching online I found that you can use the following netsh commands to query for this same value, from a command prompt (not a C++ API) netsh interface ipv4 show interfaces netsh interface ipv4 show subinterfaces The troubling issue is that while row.dwMtu may be set to 1500, snooping the network traffic on the sending laptop shows that our packets are fragmented into 1300 byte packets. netsh also reports that the MTU is 1300. Clearly the value reported by netsh command is the actual used values. Anyone know what API I can call to get the same values as netsh?

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• How do I get fluent nhibernate to create a varbinary(max) field in sql server

  - by czk

  Hi, How can I get fluent nhibernate to create a varbinary field in a sql server 2005 table that uses a field size of varbinary(max)? At the moment I always get a default of varbinary(8000), which isn't big enough as i'm going to be storing image files. I've tried using CAstle.ActiveRecord but havent had any success yet. [ActiveRecord] public class MyFile : Entity { public virtual string FileName { get; set; } public virtual string FileType { get; set; } public virtual int FileVersion { get; set; } public virtual int FileLength { get; set; } [Property(ColumnType = "BinaryBlob", SqlType = "VARBINARY(MAX)")] public virtual byte[] FileData { get; set; } } Been failing at finding a solution for hours now, so thanks in advance czk

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• UART speed possibly wrong

  - by Mike

  My brain is fried, so I thought I would pass this one to the community. When sending 1 character to my embedded system, it consistently thinks it receives 2 characters. The first received character seems to map to the transmitted character (in some unkown way) and the second received character is always 0xff Here is what I observed: Tx char (in hex) Rx character (in hex), I left out the second byte (always ff) 31 9D 32 9B 33 99 61 3D 62 3B 63 39 64 37 65 35 41 7D 42 7B 43 79 I have check my clocks and them seem to be ok. The only diff between this non working version and the previous version is that i am now using a RS485 chip. I have traced the signal all the way up to the MCU and it looks fine (confirmed the bit value on the rx pin)

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• NpgSQL insert file path containing backslashes "\\"

  - by Chau

  I am trying to create a record containing the path to a file. The insertion is done into a Postgres database where UTF8 is enabled, using the NpqSQL driver. My table definition: CREATE TABLE images ( id serial, file_location character varying NOT NULL ) My SQL statement (boiled down to a minimum): INSERT INTO images (file_location) VALUES (E'\\2010') When using pgAdmin to insert the above statement, it works fine. Using the NpgSQL driver through Visual Studio C#, it fails with this exception: "ERROR: 22021: invalid byte sequence for encoding \"UTF8\": 0x81" Replacing my SQL statement with the following: INSERT INTO images (file_location) VALUES (E'\\a2010') ^ The E is encouraged by pgAdmin when using double backslashes. So a quick recap: Why is NpqSQL stopping my insertion of the \\2010?

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• What useful GDB scripts have you used/written?

  - by nik

  People use gdb on and off for debugging, of course there are lots of other debugging tools across the varied OSes, with and without GUI and, maybe other fancy IDE features. I would like to know what useful gdb scripts you have written and liked. While, I do not mean a dump of commands in a something.gdb file that you source to pull out a bunch of data, if that made your day, go ahead and talk about it. Lets think conditional processing, control loops and functions written for more elegant and refined programming to debug and, maybe even for whitebox testing Things get interesting when you start debugging remote systems (say, over a serial/ethernet interface) And, what if the target is a multi-processor (and, multithreaded) system Let me put a simple case as an example... Say, A script that traversed serially over entries to locate a bad entry in a large hash-table that is implemented on an embedded platform. That helped me debug a broken hash-table once.

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• C or C++ to write a compiler?

  - by H.Josef

  I want to write a compiler for a custom markup language, I want to get optimum performance and I also want to have a good scalable design. Multi-paradigm programming language (C++) is more suitable to implement modern design patterns, but I think that will degrade performance a little bit (think of RTTI for example) which more or less might make C a better choice. I wonder what is the best language (C, C++ or even objective C) if someone wants to create a modern compiler (in the sense of complying to modern software engineering principles as a software) that is fast, efficient, and well designed.

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• One check constraint or multiple check constraints?

  - by RenderIn

  Any suggestions on whether fewer check constraints are better, or more? How should they be grouped if at all? Suppose I have 3 columns which are VARCHAR2(1 BYTE), each of which is a 'T'/'F' flag. I want to add a check constraint to each column specifying that only characters IN ('T', 'F') are allowed. Should I have 3 separate check constraints, one for each column: COL_1 IN ('T', 'F') COL_2 IN ('T', 'F') COL_3 IN ('T', 'F') Or a single check constraint: COL_1 IN ('T', 'F') AND COL_2 IN ('T', 'F') AND COL_3 IN ('T', 'F') My thoughts are it is best to keep these three separate, as the columns are logically unrelated to each other. The only case I would have a check constraint that examines more than one column is if there was some relationship between the value in one and the value in another, e.g.: (PARENT_CNT > 0 AND PRIMARY_PARENT IS NOT NULL) OR (PARENT_CNT = 0 AND PRIMARY_PARENT IS NULL)

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• OutOfMemoryError what to increase and how?

  - by Pentium10

  I have a really long collection with 10k items, and when running a toString() on the object it crashes. I need to use this output somehow. 05-21 12:59:44.586: ERROR/dalvikvm-heap(6415): Out of memory on a 847610-byte allocation. 05-21 12:59:44.636: ERROR/dalvikvm(6415): Out of memory: Heap Size=15559KB, Allocated=12932KB, Bitmap Size=613KB 05-21 12:59:44.636: ERROR/AndroidRuntime(6415): Uncaught handler: thread main exiting due to uncaught exception 05-21 12:59:44.636: ERROR/AndroidRuntime(6415): java.lang.OutOfMemoryError 05-21 12:59:44.636: ERROR/AndroidRuntime(6415): at java.lang.AbstractStringBuilder.enlargeBuffer(AbstractStringBuilder.java:97) 05-21 12:59:44.636: ERROR/AndroidRuntime(6415): at java.lang.AbstractStringBuilder.append0(AbstractStringBuilder.java:155) 05-21 12:59:44.636: ERROR/AndroidRuntime(6415): at java.lang.StringBuilder.append(StringBuilder.java:202) 05-21 12:59:44.636: ERROR/AndroidRuntime(6415): at java.util.AbstractCollection.toString(AbstractCollection.java:384) I need step by step guide how to increase the heap for and Android application. I don't run the command line.

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• How to update bytearray in C through JNI without returning a bytearray

  - by Android007

  Just wondering whether it is possible to update a ByteArray in C Code, which is created in Java, without returning it from C. I have situation, where I need to update a single bytearray for multiple times through JNI and returning bytearray from C takes lot of JNI calls. Please let me know if anybody knows how to do this? Code should be something like this Java Code byte[] storeData; updateFromNative(storeData); //update the byteArray in native code; //use the storeData in Java with updated value.

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• Implement a RSA algorithm in Java

  - by Robin Monjo

  Hello everyone. I want to implement a RSA algorithm to encrypt an image (byte[]). To generate my two keys I used this piece of code : KeyPairGenerator keygen = KeyPairGenerator.getInstance("RSA"); keygen.initialize(512); keyPair = keygen.generateKeyPair(); Once public and private key are generated, I would like to show them to the user so he can distribute the public key and use the private key to decode. How can I get back those key? Using keygen.getPrivateKey() and keygen.getPublicKey() give me all the information of the RSA algorithm, not only the keys I need. Thanks

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• Lucene Error While Reading binary block : java.io.EOFException

  - by tushar Khairnar

  Hi, I am getting java.io.EOFException while reading a binary block from lucene index. I am storing java object as byte-array in lucene index field and reading it when hit occurs. Here is stack trace : Caused by: java.io.EOFException at java.io.ObjectInputStream$PeekInputStream.readFully(ObjectInputStream.java:2281) at java.io.ObjectInputStream$BlockDataInputStream.readShort(ObjectInputStream.java:2750) at java.io.ObjectInputStream.readStreamHeader(ObjectInputStream.java:780) at java.io.ObjectInputStream.(ObjectInputStream.java:280) at org.terracotta.modules.searchable.util.SerializationUtil$OIS.(SerializationUtil.java:20) I have some background threads which write into index. But i buffer them and then write them at once like 1000. Occasionally I also issue optimize() on index. When I write, I am re-opening IndexReader. Does this is happening because of IndexReader re-opening call? Thanks. Regards Tushar

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• WCF Method is returning xml fragment but no xml UTF-8 header

  - by horls

  My method does not return the header, just the root element xml. internal Message CreateReturnMessage(string output, string contentType) { // create dictionaryReader for the Message byte[] resultBytes = Encoding.UTF8.GetBytes(output); XmlDictionaryReader xdr = XmlDictionaryReader.CreateTextReader(resultBytes, 0, resultBytes.Length, Encoding.UTF8, XmlDictionaryReaderQuotas.Max, null); if (WebOperationContext.Current != null) WebOperationContext.Current.OutgoingResponse.ContentType = contentType; // create Message return Message.CreateMessage(MessageVersion.None, "", xdr); } However, the output I get is: <Test> <Message>Hello World!</Message> </Test> I would like the output to render as: <?xml version="1.0" encoding="utf-8" standalone="yes"?> <Test> <Message>Hello World!</Message> </Test>

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• Converting array to Drupal format

  - by theo

  Hi all, This statement gives me the value I want in Drupal (namely the last user role): global $user; return (end($user->roles)); however I need to convert it to this format: return array( 0 => array('value' => value for value), // You'll usually want to stop here. Provide more values // if you want your 'default value' to be multi-valued: 1 => array('value' => value for value), 2 => ... ); and I've got no idea how to (also, is this format a multidimensional array?)... Any ideas? Thanks for any help, Theo.

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• describe class versions of primitive type data

  - by paula

  please some explain to me this.... Explain why java has class versios of primitive data types? describe the class versions of primitive java types and expain pros and cons? expalin why class versions of primitive java types are available, but why the primitive types are still frequently used? expalin how primitive and non-primitive data types are passed as parameters to methods in java and how that affects altering the value of data passed? primitve data types are: int, float, char, long, short, byte, boolean and double.

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• In Adobe Air, how do I pull an image from a sqlite database that was created with .net?

  - by smartdirt

  We have the need to create a sqlite database that contains images. The database is created using .net. After the db is created we need to use an air application to pull the images from the sqlite db created with c#. The database is created fine and Air can read all but the BLOB field which contains a bytearray created from an image in .net. My assumption is that the .net bytearray is not compatible with the actionscript bytearray because the actionscript byte array is encoded using the AMF protocol and the .net bytearray is not.

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• Most mind-blowing C++ hack you've ever seen?

  - by sblom

  In the same spirit as the "Hidden features of X?" series, what are the most mind-blowingly well-executed "I didn't even think the language could do that!" hacks that you've ever seen in C++. For example, my recent favorite is an implementation of the "operator" --> for pre-C++0x lambdas. Another fantastic example is Multi-dimensional analog literals. (Note: this is a community wiki question to avoid the appearance of reputation-whoring.)

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• Perl: Event-driven Programming

  - by Shiftbit

  Is there any POSIX signals that I could utilize in my perl program to create event-driven programming? Currently I have multi-process program that is able to cross communicate but my parent thread is only able to listen to listen at one child at a time. foreach (@threads) { sysread(${$_}{'read'}, my $line, 100); chomp($line); print "Parent hears: $line\n"; } The problem is that the parent sits in a continual wait state until it receives it a signal from the first child before it can continue on. I am relying on 'pipe' for my intercommunication. My current solution is very similar to: http://stackoverflow.com/questions/2558098/how-can-i-use-pipe-to-facilitate-interprocess-communication-in-perl If possible I would like to rely on a $SIG{...} event or any non-CPAN solution.

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• Best way to produce automated exports in tab-delimited form from Teradata?

  - by Cade Roux

  I would like to be able to produce a file by running a command or batch which basically exports a table or view (SELECT * FROM tbl), in text form (default conversions to text for dates, numbers, etc are fine), tab-delimited, with NULLs being converted to empty field (i.e. a NULL colum would have no space between tab characters, with appropriate line termination (CRLF or Windows), preferably also with column headings. This is the same export I can get in SQL Assistant 12.0, but choosing the export option, using tab delimiter, setting my NULL value to '' and including column headings. I have been unable to find the right combination of options - the closest I have gotten is by building a single column with CAST and '09'XC, but the rows still have a leading 2-byte length indicator in most settings I have tried. I would prefer not to have to build large strings for the various different tables.

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• Boost C++ Singleton error LNK2001: unresolved external symbol "private: static long Nsp::HL::flag" (

  - by Soós Roland

  I try to create a multi-threaded singleton pattern class. Header: class HL{ public: static HL* getInstance(); ......... private: static HL* instance; static boost::once_flag flag; HL(); static void initOnce(); } CPP: HL* HL::instance = NULL; HL* HL::getInstance(){ if(instance == NULL){ boost::call_once(flag, initOnce); } return instance; } void HL::initOnce(){ instance = new HL(); } I get this error: error LNK2001: unresolved external symbol "private: static long Nsp::HL::flag" (?flag@HL@Nsp@@0JA) What's wrong?

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• Invoke "internal extern" constructor using reflections

  - by Riz

  Hi, I have following class (as seen through reflector) public class W : IDisposable { public W(string s); public W(string s, byte[] data); // more constructors [MethodImpl(MethodImplOptions.InternalCall)] internal extern W(string s, int i); public static W Func(string s, int i); } I am trying to call "internal extern" constructor or Func using reflections MethodInfo dynMethod = typeof(W).GetMethod("Func", BindingFlags.Static); object[] argVals = new object[] { "hi", 1 }; dynMethod.Invoke(null, argVals); and Type type = typeof(W); Type[] argTypes = new Type[] { typeof(System.String), typeof(System.Int32) }; ConstructorInfo cInfo = type.GetConstructor(BindingFlags.InvokeMethod | BindingFlags.NonPublic, null, argTypes, null); object[] argVals = new object[] { "hi", 1 }; dynMethod.Invoke(null, argVals); unfortunantly both variants rise NullReferenceException when trying to Invoke, so, I must be doing something wrong?

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• Debugging dynamic sql + dynamic tables in MS SQL Server 2008.

  - by Hamish Grubijan

  Hi, I have a messy stored procedure which uses dynamic sql. I can debug it in runtime by adding print @sql; where @sql; is the string containing the dynamic SQL, right before I call execute (@sql);. Now, the multi-page stored procedure also creates dynamic tables and uses them in a query. I want to print those tables to the console right before I do an execute, so that I know exactly what the query is trying to do. However, the SQL Server 08 does not like that. When I try: print #temp_table; and try to compile the S.P. I get this error: The name "#temp_table" is not permitted in this context. Valid expressions are constants, constant expressions, and (in some contexts) variables. Column names are not permitted. Please help.

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• How do I test SendInput in c#

  - by JoelHess

  How can I tell if my call to SendInput is working properly? I have a small snippet below, and the message never seems to get hit. SendInput() returns 1, and there's no errors, so I assume that the message is going out properly. I've also tried the Form KeyPress and KeyDown Events, and I never seem to get those either. private void button1_Click(object sender, EventArgs e) { INPUT input = new INPUT(); input.mkhi.ki.wVk = (byte)System.Windows.Forms.Keys.B; uint result = SendInput(1, ref input, Marshal.SizeOf(new INPUT())); } protected override void WndProc(ref Message m) { if (m.Msg == WM_KEYDOWN) { Console.WriteLine("GotIt"); } base.WndProc(ref m); }

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