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• Conversion to Dalvik format failed error for Android Grid View

  - by Bub

  Hey Everyone, I'm on the android bandwagon and started going through google's "view" tutorials. Here is what I'm using: Eclipse Galileo Android SDK 2.1 Java SDK 6.Something I think. Everything was hunky-dory until I hit the grid view tutorial. I got errors all over the place when I started editing the "HelloGridview.java" File. I thought I'd fix it by following through with the next part of the tutorial, creating the ImageAdapter class, but it created more. I realized alot of my issues could be resolved by importing widgets which were not mentioned in the tutorial (i.e. android.widget.GridView, .ImageView, .BaseAdapter etc.) However, after all the reconciliation suggested by eclipse the files were finally showing no errors. I go to run it as an android app and bam, "Your project contains error(s)." window comes up. There are no errors showing on the files I've created. I cleared the error log and shut down eclipse and started again the error log now reads: Conversion to Dalvik format failed with error 1. I'm a little lost at this point. I think I've included the required information. If you need to know more let me know. Any help is appreciated.

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• OleDbExeption Was unhandled in VB.Net

  - by ritch

  Syntax error (missing operator) in query expression '((ProductID = ?) AND ((? = 1 AND Product Name IS NULL) OR (Product Name = ?)) AND ((? = 1 AND Price IS NULL) OR (Price = ?)) AND ((? = 1 AND Quantity IS NULL) OR (Quantity = ?)))'. I need some help sorting this error out in Visual Basics.Net 2008. I am trying to update records in a MS Access Database 2008. I have it being able to update one table but the other table is just not having it. Private Sub Admin_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load 'Reads Users into the program from the text file (Located at Module.VB) ReadUsers() 'Connect To Access 2007 Database File con.ConnectionString = ("Provider=Microsoft.ACE.OLEDB.12.0;" & "Data Source=E:\Computing\Projects\Login\Login\bds.accdb;") con.Open() 'SQL connect 1 sql = "Select * From Clients" da = New OleDb.OleDbDataAdapter(sql, con) da.Fill(ds, "Clients") MaxRows = ds.Tables("Clients").Rows.Count intCounter = -1 'SQL connect 2 sql2 = "Select * From Products" da2 = New OleDb.OleDbDataAdapter(sql2, con) da2.Fill(ds, "Products") MaxRows2 = ds.Tables("Products").Rows.Count intCounter2 = -1 'Show Clients From Database in a ComboBox ComboBoxClients.DisplayMember = "ClientName" ComboBoxClients.ValueMember = "ClientID" ComboBoxClients.DataSource = ds.Tables("Clients") End Sub The button, the error appears on da2.update(ds, "Products") Private Sub Button4_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button4.Click Dim cb2 As New OleDb.OleDbCommandBuilder(da2) ds.Tables("Products").Rows(intCounter2).Item("Price") = ProductPriceBox.Text da2.Update(ds, "Products") 'Alerts the user that the Database has been updated MsgBox("Database Updated") End Sub However the code works on updating another table Private Sub UpdateButton_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles UpdateButton.Click 'Allows users to update records in the Database Dim cb As New OleDb.OleDbCommandBuilder(da) 'Changes the database contents with the content in the text fields ds.Tables("Clients").Rows(intCounter).Item("ClientName") = ClientNameBox.Text ds.Tables("Clients").Rows(intCounter).Item("ClientID") = ClientIDBox.Text ds.Tables("Clients").Rows(intCounter).Item("ClientAddress") = ClientAddressBox.Text ds.Tables("Clients").Rows(intCounter).Item("ClientTelephoneNumber") = ClientNumberBox.Text 'Updates the table withing the Database da.Update(ds, "Clients") 'Alerts the user that the Database has been updated MsgBox("Database Updated") End Sub

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• Extract wrong data from a frame in C?

  - by ipkiss

  I am writing a program that reads the data from the serial port on Linux. The data are sent by another device with the following frame format: |start | Command | Data | CRC | End | |0x02 | 0x41 | (0-127 octets) | | 0x03| ---------------------------------------------------- The Data field contains 127 octets as shown and octet 1,2 contains one type of data; octet 3,4 contains another data. I need to get these data. Because in C, one byte can only holds one character and in the start field of the frame, it is 0x02 which means STX which is 3 characters. So, in order to test my program, On the sender side, I construct an array as the frame formatted above like: char frame[254]; frame[0] = 0x02; // starting field frame[1] = 0x41; // command field which is character 'A' ..so on.. And, then On the receiver side, I take out the fields like: char result[254]; // read data read(result); printf("command = %c", result[1]); // get the command field of the frame // get other field's values the command field value (result[1]) is not character 'A'. I think, this because the first field value of the frame is 0x02 (STX) occupying 3 first places in the array frame and leading to the wrong results on the receiver side. How can I correct the issue or am I doing something wrong at the sender side? Thanks all. related questions: http://stackoverflow.com/questions/2500567/parse-and-read-data-frame-in-c http://stackoverflow.com/questions/2531779/clear-data-at-serial-port-in-linux-in-c

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• How would I write the following applescript in Obj-C AppScript? ASTranslate was of no help =(

  - by demonslayer319

  The translation tool isn't able to translate this working code. I copied it out of a working script. set pathToTemp to (POSIX path of ((path to desktop) as string)) -- change jpg to pict tell application "Image Events" try launch set albumArt to open file (pathToTemp & "albumart.jpg") save albumArt as PICT in file (pathToTemp & "albumart.pict") --the first 512 bytes are the PICT header, so it reads from byte 513 --this is to allow the image to be added to an iTunes track later. set albumArt to (read file (pathToTemp & "albumart.pict") from 513 as picture) close end try end tell The code is taking a jpg image, converting it to a PICT file, and then reading the file minus the header (the first 512 bytes). Later in the script, albumArt will be added to an iTunes track. I tried translating the code (minus the comments), but ASTranslate froze for a good 2 minutes before giving me this: Untranslated event 'earsffdr' #import "IEGlue/IEGlue.h" IEApplication *imageEvents = [IEApplication applicationWithName: @"Image Events"]; IELaunchCommand *cmd = [[imageEvents launch] ignoreReply]; id result = [cmd send]; #import "IEGlue/IEGlue.h" IEApplication *imageEvents = [IEApplication applicationWithName: @"Image Events"]; IEReference *ref = [[imageEvents files] byName: @"/Users/Doom/Desktop/albumart.jpg"]; id result = [[ref open] send]; #import "IEGlue/IEGlue.h" IEApplication *imageEvents = [IEApplication applicationWithName: @"Image Events"]; IEReference *ref = [[imageEvents images] byName: @"albumart.jpg"]; IESaveCommand *cmd = [[[ref save] in: [[imageEvents files] byName: @"/Users/Doom/Desktop/albumart.pict"]] as: [IEConstant PICT]]; id result = [cmd send]; 'crdwrread' Traceback (most recent call last): File "objcrenderer.pyc", line 283, in renderCommand KeyError: 'crdwrread' 'cascrgdut' Traceback (most recent call last): File "objcrenderer.pyc", line 283, in renderCommand KeyError: 'cascrgdut' 'crdwrread' Traceback (most recent call last): File "objcrenderer.pyc", line 283, in renderCommand KeyError: 'crdwrread' Untranslated event 'rdwrread' OK I have no clue how to make sense of this. Thanks for any and all help!

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• C# StreamReader.EndOfStream produces IOException

  - by Ziplin

  I'm working on an application that accepts TCP connections and reads in data until an </File> marker is read and then writes that data to the filesystem. I don't want to disconnect, I want to let the client sending the data to do that so they can send multiple files in one connection. I'm using the StreamReader.EndOfStream around my outter loop, but it throws an IOException when the client disconnects. Is there a better way to do this? private static void RecieveAsyncStream(IAsyncResult ar) { TcpListener listener = (TcpListener)ar.AsyncState; TcpClient client = listener.EndAcceptTcpClient(ar); // init the streams NetworkStream netStream = client.GetStream(); StreamReader streamReader = new StreamReader(netStream); StreamWriter streamWriter = new StreamWriter(netStream); while (!streamReader.EndOfStream) // throws IOException { string file= ""; while (file!= "</File>" && !streamReader.EndOfStream) { file += streamReader.ReadLine(); } // write file to filesystem } listener.BeginAcceptTcpClient(RecieveAsyncStream, listener); }

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• SL 3 navigation not working!

  - by Silver Gun

  Hey Guys I converted all my existing Silverlight app UserControls to Pages so I could use the Navigation Framework. Anyway so I created a UserControl called MyFrame, which would host all the pages. In my App.xaml.cs I have the following to make sure that MyFrame is loaded when the App loads: private void Application_Startup(object sender, StartupEventArgs e) { this.RootVisual = new MyFrame(); } My UriMapper class resides in App.xaml and looks like the following: <navcore:UriMapper x:Key="uriMapper"> <navcore:UriMapping Uri="Login" MappedUri="Login.xaml"> </navcore:UriMapper> Within my 'MyFrame' class, I have the following <StackPanel Orientation="Horizontal"> <StackPanel Orientation="Vertical"> <HyperlinkButton Tag="Login" Content="Login" Click="HyperlinkButton_Click" /> </StackPanel> <StackPanel Orientation="Vertical"> <navigation:Frame x:Name="ContentFrame" Style="{StaticResource ContentFrameStyle}" /> </StackPanel> </StackPanel> And within the callback for my HyperlinkButton's event handler, I have the following: private void HyperlinkButton_Click(object sender, RoutedEventArgs e) { ContentFrame.Navigate(new Uri((sender as HyperlinkButton).Tag.ToString(), UriKind.Relative)); } The Login.xaml file is in my root folder (right under Project). This navigation does not seem to work! The exception I get reads like so: Navigation is only supported to relative URIs that are fragments, or begin with '/', or which contain ';component/'. Parameter name: uri The Login page does not load. There is no problem with Login.xaml as when I set this.RootVisual = new Login(); the page loads just fine. I also tried setting the NavigateUri attribute of the HyperlinkButton to "Login." No cigar. I'll appreciate any help! Thanks a lot in advance

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• How to change identifier quote character in SSIS for connection to ODBC DSN

  - by William Rose

  I'm trying to create an SSIS 2008 Data Source View that reads from an Ingres database via the ODBC driver for Ingres. I've downloaded the Ingres 10 Community Edition to get the ODBC driver, installed it, set up the data access server and a DSN on the server running SSIS. If I connect to the SQL Server 2008 Database Engine on the server running SSIS, I can retrieve data from Ingres over the ODBC DSN by running the following command: SELECT * FROM OPENROWSET( 'MSDASQL' , 'DSN=IngresODBC;UID=testuser;PWD=testpass' , 'SELECT * FROM iitables') So I am quite sure that the ODBC setup is correct. If I try the same query with SQL Server style bracketed identifier quotes, I get an error, as Ingres doesn't support this syntax. SELECT * FROM OPENROWSET( 'MSDASQL' , 'DSN=IngresODBC;UID=testuser;PWD=testpass' , 'SELECT * FROM [iitables]') The error is "[Ingres][Ingres 10.0 ODBC Driver][Ingres 10.0]line 1, Unexpected character '['.". What I am finding is that I get the same error when I try to add tables from Ingres to an SSIS Data Source View. The initial step of selecting the ODBC Provider works fine, and I am shown a list of tables / views to add. I then select any table, and try to add it to the view, and get "ERROR [5000A] [Ingres][Ingres 10.0 ODBC Driver][Ingres 10.0]line 3, Unexpected character '['.". Following Ed Harper's suggestion of creating a named query also seems to be stymied. If I put into my named query the following text: SELECT * FROM "iitables" I still get an error: "ERROR [5000A] [Ingres][Ingres 10.0 ODBC Driver][Ingres 10.0]line 2, Unexpected character '['". According to the error, the query text passed by SSIS to ODBC was: SELECT [iitables].* FROM ( SELECT * FROM "iitables" ) AS [iitables] It seems that SSIS assumes that bracket quote characters are acceptable, when they aren't. How can I persuade it not to use them? Double quotes are acceptable.

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• Add Hexidecimal Header Info to JPEG File Using Java

  - by jboyd

  I need to add header info to a JPEG file in order to get it to work properly when shared on some websites, I've tracked down the correct info through a lot of Hex digging, but now I'm kind of stuck trying to get it into the file. I know where in the file it needs to go, and I know how long it is, my problem is that RandomAccessFile just overwrites existing data in the file and FileOutputStream appends the data to the end. I don't want either, I want to INSERT data starting at the third byte. My example code: File fileToChange = new File("someimage.jpg"); byte[] i = new byte[2]; i[0] = (byte)Integer.decode("0xcc"); i[1] = (byte)Integer.decode("0xcc"); RandomAccessFile f = new RandomAccessFile(new File("videothing.jpg"), "rw"); long aPositionWhereIWantToGo = 2; f.seek(aPositionWhereIWantToGo); // this basically reads n bytes in the file f.write((byte[])i); f.close(); So this doesn't work because it overwrites, and does not insert, I can't find any way to just insert data into a file

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• Where are tables in Mnesia located?

  - by Sanoj

  I try to compare Mnesia with more traditional databases. As I understand it tables in Mnesia can be located to: ram_copies - tables are stored in RAM only, so no durability as in ACID. disc_copies - tables are located on disc and a copy is located in RAM, so the table can not be bigger than the available memory? disc_only_copies - tables are located to disc only, so no caching in memory and worse performance? And the size of the table are limited to the size of dets or the table has to be fragmented. So if I want the performance of doing reads from RAM and the durability of writes to disc, then the size of the tables are very limited compared to a traditional RDBMS like MySQL or PostgreSQL. I know that Mnesia aren't meant to replace traditional RDBMS:s, but can it be used as a big RDBMS or do I have to look for another database? The server I will use is a VPS with limited amount of memory, around 512MB, but I want good database performance. Are disc_copies and the other types of tables in Mnesia so limited as I have understood?

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• Ways std::stringstream can set fail/bad bit?

  - by Evan Teran

  A common piece of code I use for simple string splitting looks like this: inline std::vector<std::string> split(const std::string &s, char delim) { std::vector<std::string> elems; std::stringstream ss(s); std::string item; while(std::getline(ss, item, delim)) { elems.push_back(item); } return elems; } Someone mentioned that this will silently "swallow" errors occurring in std::getline. And of course I agree that's the case. But it occurred to me, what could possibly go wrong here in practice that I would need to worry about. basically it all boils down to this: inline std::vector<std::string> split(const std::string &s, char delim) { std::vector<std::string> elems; std::stringstream ss(s); std::string item; while(std::getline(ss, item, delim)) { elems.push_back(item); } if(ss.fail()) { // *** How did we get here!? *** } return elems; } A stringstream is backed by a string, so we don't have to worry about any of the issues associated with reading from a file. There is no type conversion going on here since getline simply reads until it sees a newline or EOF. So we can't get any of the errors that something like boost::lexical_cast has to worry about. I simply can't think of something besides failing to allocate enough memory that could go wrong, but that'll just throw a std::bad_alloc well before the std::getline even takes place. What am I missing?

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• Java: volatile guarantees and out-of-order execution

  - by WizardOfOdds

  Note that this question is solely about the volatile keyword and the volatile guarantees: it is not about the synchronized keyword (so please don't answer "you must use synchronize" for I don't have any issue to solve: I simply want to understand the volatile guarantees (or lack of guarantees) regarding out-of-order execution). Say we have an object containing two volatile String references that are initialized to null by the constructor and that we have only one way to modify the two String: by calling setBoth(...) and that we can only set their references afterwards to non-null reference (only the constructor is allowed to set them to null). For example (it's just an example, there's no question yet): public class SO { private volatile String a; private volatile String b; public SO() { a = null; b = null; } public void setBoth( @NotNull final String one, @NotNull final String two ) { a = one; b = two; } public String getA() { return a; } public String getB() { return b; } } In setBoth(...), the line assigning the non-null parameter "a" appears before the line assigning the non-null parameter "b". Then if I do this (once again, there's no question, the question is coming next): if ( so.getB() != null ) { System.out.println( so.getA().length ); } Am I correct in my understanding that due to out-of-order execution I can get a NullPointerException? In other words: there's no guarantee that because I read a non-null "b" I'll read a non-null "a"? Because due to out-of-order (multi)processor and the way volatile works "b" could be assigned before "a"? volatile guarantees that reads subsequent to a write shall always see the last written value, but here there's an out-of-order "issue" right? (once again, the "issue" is made on purpose to try to understand the semantics of the volatile keyword and the Java Memory Model, not to solve a problem).

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• Memory mapped files and "soft" page faults. Unavoidable?

  - by Robert Oschler

  I have two applications (processes) running under Windows XP that share data via a memory mapped file. Despite all my efforts to eliminate per iteration memory allocations, I still get about 10 soft page faults per data transfer. I've tried every flag there is in CreateFileMapping() and CreateFileView() and it still happens. I'm beginning to wonder if it's just the way memory mapped files work. If anyone there knows the O/S implementation details behind memory mapped files I would appreciate comments on the following theory: If two processes share a memory mapped file and one process writes to it while another reads it, then the O/S marks the pages written to as invalid. When the other process goes to read the memory areas that now belong to invalidated pages, this causes a soft page fault (by design) and the O/S knows to reload the invalidated page. Also, the number of soft page faults is therefore directly proportional to the size of the data write. My experiments seem to bear out the above theory. When I share data I write one contiguous block of data. In other words, the entire shared memory area is overwritten each time. If I make the block bigger the number of soft page faults goes up correspondingly. So, if my theory is true, there is nothing I can do to eliminate the soft page faults short of not using memory mapped files because that is how they work (using soft page faults to maintain page consistency). What is ironic is that I chose to use a memory mapped file instead of a TCP socket connection because I thought it would be more efficient. Note, if the soft page faults are harmless please note that. I've heard that at some point if the number is excessive, the system's performance can be marred. If soft page faults intrinsically are not significantly harmful then if anyone has any guidelines as to what number per second is "excessive" I'd like to hear that. Thanks.

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• Writing Russian in XML

  - by zavié

  Hi, I am writing a Xml Tag Renamer class with Java which reads in a XML, renames the tags and write them back into another XML file using DocumentBuilderFactory and TransformerFactory (text nodes are preserved). It worked fine before with German and English texts, until today, when I tried to rename a XML file with russian text. Instead of the source texts I got ????? in the newly created XML file. I've tried setting Encoding Any idea how to correct this? Thanks! PS. Strings were correct before entering TransformerFactory, as I checked in the debugger. I've tried setting OutputKeys.ENCODING to UTF-8 and ISO-8859-5. None of them helped. The Transformer part: // Output the XML // Set up a transformer TransformerFactory transFactory = TransformerFactory.newInstance(); Transformer transformer = transFactory.newTransformer(); transformer.setOutputProperty(OutputKeys.OMIT_XML_DECLARATION, "no"); // Fix to a bug about indent in transformer transformer.setOutputProperty ("{http://xml.apache.org/xslt}indent-amount", "4"); transformer.setOutputProperty(OutputKeys.INDENT, "yes"); // TODO encoding parameter transformer.setOutputProperty(OutputKeys.ENCODING, "UTF-8"); // Create string from xml tree StringWriter sw = new StringWriter(); StreamResult result = new StreamResult(sw); DOMSource source = new DOMSource(doc); transformer.transform(source, result); String xmlString = sw.toString(); xmlString.replaceAll("\n", System.getProperty("line.separator")); // Write to file BufferedWriter output = new BufferedWriter(new FileWriter(outputPath)); output.write(xmlString); output.close();

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• WebFaultException http status code is not passed

  - by Mike Bantegui

  I have the following service method: <OperationContract()> <WebGet([ResponseFormat]:=WebMessageFormat.Json)> Function ShouldThrowException() As Boolean It's implementation does only one thing, which is to throw a WebFaultException. Public Function ShouldThrowException() As Boolean Implements IRestService.ShouldThrowException Throw New WebFaultException(Of String)("This should fail", HttpStatusCode.BadRequest) End Function My web.config reads as: <endpointBehaviors> <behavior name="WebEndpointBehavior"> <webHttp /> </behavior> </endpointBehaviors> .. snip .. <webHttpBinding> <binding name="WebBinding" crossDomainScriptAccessEnabled="true"> <security mode="None" /> </binding> </webHttpBinding> .. snip .. <service name="RestService"> <endpoint address="" binding="webHttpBinding" behaviorConfiguration="WebEndpointBehavior" bindingConfiguration="WebBinding" contract="IRestService" name="RestService"> </endpoint> </service> When I call ShouldThrowException via my browser, I only get the following: "This should fail" I was expecting to get a 400 Bad Request error on the page. If I inspect the page using FireBug, I see that the HTTP status code that was returned is a 200 OK. According to this blog post, I should be seeing this exception. Except I'm not. What am I doing wrong here?

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• Dilemma of Sending a Byte Array from JavaScript to COM.

  - by Voulnet

  Hello there, I'm having a bit of a problem because neither Javascript nor ActiveX (written in C++) are behaving like good little children. All I'm asking them to do is for Javascript to send a byte array and for the ActiveX to receive the byte array correctly in order to do more computation. This is how I declared my byte array in JS, and I verified it inside JS: var arr = new Array(0x00, 0xA4, 0x04, 0x00, 0x10,0xA0, 0x00, 00, 00, 0x18, 0x30, 0x03, 0x01, 00, 00, 00, 00, 00, 00, 00, 00); Javascript sends this array as an argument to an ActiveX method. Here is the tricky part; I want the ActiveX method to receive the byte array as a SAFEARRAY or VARIANT, but I can't get it to work for the life of me. I tried debugging and seeing the contents received inside the ActiveX as both SAFEARRAY or VARIANT, but to no avail. Here is the IDL segment: [id(7), helpstring("NEW Sends APDU to Card and Reads the Response")] HRESULT NewSendAPDU( [in] VARIANT pAPDU, [out, retval]VARIANT* pAPDUResponse); Any help is greatly appreciated. Thanks in advance!

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• How to scrape Google SERP based on copyright year?

  - by Michael Mao

  Hi all: I know there must be ways to do this sort of things. I am not pro in RoR or Python, not even an expert in PHP. So my solution tends to be quite dumb: It uses a FireFox add-on called imarcos to scrape the target urls from Google SERP, and use PHP to store info into the database. At the very core of my workaround there lies a problem: How to specifically find target urls based on their copyright year? I mean, something like "copyright 1998-2006" in the footer is to be considered a target, but my search results are not 100% accurate. I used the following url to search : http://www.google.com.au/#hl=en&q=inurl:.com.au+intext:copyright+1995..2007+--2008+--2009&start=0&cad=b&fp=6a8119b094529f00 It reads : search for pages that have .com.au in URL and a copyright range from 1995 to 2007 exclude the year of 2008 or 2009. Starting position is 0, of course the offset can be changed. I've already done a dummy list and honestly I am not pleased with the result. That's mostly because I cannot find a way to restrict search terms in the exact order as they are entered into the search url. copyright can appear in anywhere on page and doesn't necessarily before the years, that's the current story. Is there a more clear way to sort out this? Oh, almost forgot to say the client doesn't wanna spent too much in this - I cannot persuade him simply buy some cool software, unfortunately. I hope there is a way to use clever Google search operators or similar things to go around this issue. Many thanks in advance!

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• How can I store HTML in a Doctrine YML fixture

  - by argibson

  I am working with a CMS-type site in Symfony 1.4 (Doctrine 1.2) and one of the things that is frustrating me is not being able to store HTML pages in YML fixtures. Instead I have to create SQL backups of the data if I want to drop and rebuild which is a bit of a pest when Symfony/Doctrine has a fantastic mechanism for doing exactly this. I could write a mechanism that reads in a set of HTML files for each page and fills the data in that way (or even write it as a task). But before I go down that road I am wondering if there is any way for HTML to be stored in a YML fixture so that Doctrine can simply import it into the database. Update: I have tried using symfony doctrine:data-dump and symfony doctrine:data-load however despite the dump correctly creating the fixture with the HTML, the load task appears to 'skip' the value of the column with the HTML and enters everything else into the row. In the database the field doesn't show up as 'NULL' but rather empty so I believe Doctrine is adding the value of the column as ''. Below is a sample of the YML fixture that symfony doctrine:data-dump created. I have tried running symfony doctrine:data-load against various forms of this including removing all the escaped characters (new lines and quotes leaving only angle brackets) but it still doesn't work. Product_69: name: 'My Product' Developer: Developer_30 tagline: 'Text that briefly describes the product' version: '2008' first_published: '' price_code: A79 summary: '' box_image: '' description: "<div id=\"featureSlider\">\n <ul class=\"slider\">\n <li class=\"sliderItem\" title=\"Summary\">\n <div class=\"feature\">\n Some text goes in here</div>\n </li>\n </ul>\n </div>\n" is_visible: true

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• SQL Server - Multi-Column substring matching

  - by hamlin11

  One of my clients is hooked on multi-column substring matching. I understand that Contains and FreeText search for words (and at least in the case of Contains, word prefixes). However, based upon my understanding of this MSDN book, neither of these nor their variants are capable of searching substrings. I have used LIKE rather extensively (Select * from A where A.B Like '%substr%') Sample table A: ID | Col1 | Col2 | Col3 | ------------------------------------- 1 | oklahoma | colorado | Utah | 2 | arkansas | colorado | oklahoma | 3 | florida | michigan | florida | ------------------------------------- The following code will give us row 1 and row 2: select * from A where Col1 like '%klah%' or Col2 like '%klah%' or Col3 like '%klah%' This is rather ugly, probably slow, and I just don't like it very much. Probably because the implementations that I'm dealing with have 10+ columns that need searched. The following may be a slight improvement as code readability goes, but as far as performance, we're still in the same ball park. select * from A where (Col1 + ' ' + Col2 + ' ' + Col3) like '%klah%' I have thought about simply adding insert, update, and delete triggers that simply add the concatenated version of the above columns into a separate table that shadows this table. Sample Shadow_Table: ID | searchtext | --------------------------------- 1 | oklahoma colorado Utah | 2 | arkansas colorado oklahoma | 3 | florida michigan florida | --------------------------------- This would allow us to perform the following query to search for '%klah%' select * from Shadow_Table where searchtext like '%klah%' I really don't like having to remember that this shadow table exists and that I'm supposed to use it when I am performing multi-column substring matching, but it probably yields pretty quick reads at the expense of write and storage space. My gut feeling tells me there there is an existing solution built into SQL Server 2008. However, I don't seem to be able to find anything other than research papers on the subject. Any help would be appreciated.

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• Using fgets to read strings from file in C

  - by Ivan

  I am trying to read strings from a file that has each string on a new line but I think it reads a newline character once instead of a string and I don't know why. If I'm going about reading strings the wrong way please correct me. i=0; F1 = fopen("alg.txt", "r"); F2 = fopen("tul.txt", "w"); if(!feof(F1)) { do{ //start scanning file fgets(inimene[i].Enimi, 20, F1); fgets(inimene[i].Pnimi, 20, F1); fgets(inimene[i].Kood, 12, F1); printf("i=%d\nEnimi=%s\nPnimi=%s\nKaad=%s",i,inimene[i].Enimi,inimene[i].Pnimi,inimene[i].Kood); i++;} while(!feof(F1));}; /*finish getting structs*/ The printf is there to let me see what was read into what and here is the result i=0 Enimi=peter Pnimi=pupkin Kood=223456iatb i=1 Enimi= Pnimi=masha Kaad=gubkina i=2 Enimi=234567iasb Pnimi=sasha Kood=dudkina As you can see after the first struct is read there is a blank(a newline?) onct and then everything is shifted. I suppose I could read a dummy string to absorb that extra blank and then nothing would be shifted, but that doesn't help me understand the problem and avoid in the future.

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• How to get forkpty to handle redirection and other bash-isms?

  - by Jeremy Friesner

  Hi all, I've got a GUI C++ program that takes a shell command from the user, calls forkpty() and execvp() to execute that command in a child process, while the parent (GUI) process reads the child process's stdout/stderr output and displays it in the GUI. This all works nicely (under Linux and MacOS/X). For example, if the user enters "ls -l /foo", the GUI will display the contents of the /foo folder. However, bash niceties like output redirection aren't handled. For example, if the user enters "echo bar /foo/bar.txt", the child process will output the text "bar /foo/bar.txt", instead of writing the text "bar" to the file "/foo/bar.txt". Presumably this is because execvp() is running the executable command "echo" directly, instead of running /bin/bash and handing it the user's command to massage/preprocess. My question is, what is the correct child process invocation to use, in order to make the system behave exactly as if the user had typed in his string at the bash prompt? I tried wrapping the user's command with a /bin/bash invocation, like this: /bin/bash -c the_string_the_user_entered, but that didn't seem to work. Any hints?

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• Improve Efficiency for This Text Processing Code

  - by johnv

  I am writing a program that counts the number of words in a text file which is already in lowercase and separated by spaces. I want to use a dictionary and only count the word IF it's within the dictionary. The problem is the dictionary is quite large (~100,000 words) and each text document has also ~50,000 words. As such, the codes that I wrote below gets very slow (takes about 15 sec to process one document on a quad i7 machine). I'm wondering if there's something wrong with my coding and if the efficiency of the program can be improved. Thanks so much for your help. Code below: public static string WordCount(string countInput) { string[] keywords = ReadDic(); /* read dictionary txt file*/ /*then reads the main text file*/ Dictionary<string, int> dict = ReadFile(countInput).Split(' ') .Select(c => c) .Where(c => keywords.Contains(c)) .GroupBy(c => c) .Select(g => new { word = g.Key, count = g.Count() }) .OrderBy(g => g.word) .ToDictionary(d => d.word, d => d.count); int s = dict.Sum(e => e.Value); string k = s.ToString(); return k; }

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• Help setting up command line gist

  - by smotchkkiss

  setup I'm following defunkt's gist setup guide. [smotchkkiss ~]$ sudo gem install gist [smotchkkiss ~]$ git config --global github.user "my github name" [smotchkkiss ~]$ git config --global github.token "my github token" [smotchkkiss ~]$ echo "puts 'hello, gist.'" > hello.rb [smotchkkiss ~]$ gist hello.rb output Usage: open [-e] [-t] [-f] [-W] [-n] [-g] [-h] [-b <bundle identifier>] [-a <application>] [filenames] Help: Open opens files from a shell. By default, opens each file using the default application for that file. If the file is in the form of a URL, the file will be opened as a URL. Options: -a Opens with the specified application. -b Opens with the specified application bundle identifier. -e Opens with TextEdit. -t Opens with default text editor. -f Reads input from standard input and opens with TextEdit. -W, --wait-apps Blocks until the used applications are closed (even if they were already running). -n, --new Open a new instance of the application even if one is already running. -g, --background Does not bring the application to the foreground. -h, --header Searches header file locations for headers matching the given filenames, and opens them. return value nil help! nil return value? What gives? No new gist appears in my My Gists page on github.

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• Problem: Sorting for GridView/ObjectDataSource changes depending on page

  - by user148298

  I have a GridView tied to an ObjectDataSource using paging. The paging works fine, except that the sort order changes depending on which page of the results is being viewed. This causes items to reappear on subsequent pages among other issues. I traced the problem to my DAL, which reads a page at a time and then sorts it. Obviously the sorting is going to change as the result set size changes. Is there an improvement to this algorithm. I would like to use a datareader if possible: [System.ComponentModel.DataObjectMethod(System.ComponentModel.DataObjectMethodType.Select)] public static WordsCollection LoadForCriteria(string sqlCriteria, int maximumRows, int startRowIndex, string sortExpression) { //DEFAULT SORT EXPRESSION if (string.IsNullOrEmpty(sortExpression)) sortExpression = "OrderBy"; //CREATE THE DYNAMIC SQL TO LOAD OBJECT StringBuilder selectQuery = new StringBuilder(); selectQuery.Append("SELECT"); if (maximumRows > 0) selectQuery.Append(" TOP " + (startRowIndex + maximumRows).ToString()); selectQuery.Append(" " + Words.GetColumnNames(string.Empty)); selectQuery.Append(" FROM sw_Words"); string whereClause = string.IsNullOrEmpty(sqlCriteria) ? string.Empty : " WHERE " + sqlCriteria; selectQuery.Append(whereClause); selectQuery.Append(" ORDER BY " + sortExpression); Database database = Token.Instance.Database; DbCommand selectCommand = database.GetSqlStringCommand(selectQuery.ToString()); //EXECUTE THE COMMAND WordsCollection results = new WordsCollection(); int thisIndex = 0; int rowCount = 0; using (IDataReader dr = database.ExecuteReader(selectCommand)) { while (dr.Read() && ((maximumRows < 1) || (rowCount < maximumRows))) { if (thisIndex >= startRowIndex) { Words varWords = new Words(); Words.LoadDataReader(varWords, dr); results.Add(varWords); rowCount++; } thisIndex++; } dr.Close(); } return results; }

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• How to print a Perl 2-dimensional array?

  - by Matt Pascoe

  I am trying to write a simple Perl script that reads a *.csv, places the rows of the *.csv file in a two dimensional array, and then prints on item out of the array and then prints a row of the array. #!/usr/bin/perl use strict; use warnings; open(CSV, $ARGV[0]) || die("Cannot open the $ARGV[0] file: $!"); my @row; my @table; while(<CSV>) { @row = split(/\s*,\s*/, $_); push(@table, @row); } close CSV || die $!; foreach my $element ( @{ $table[0] } ) { print $element, "\n"; } print "$table[0][1]\n"; When I run this script I receive the following error and nothing prints: Can't use string ("1") as an ARRAY ref while "strict refs" in use at ./scripts.pl line 16. I have looked in a number of other forums and am still not sure how to fix this issue. Can anyone help me fix this script?

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• Convert function to read from string instead of file in C

  - by Dusty

  I've been tasked with updating a function which currently reads in a configuration file from disk and populates a structure: static int LoadFromFile(FILE *Stream, ConfigStructure *cs) { int tempInt; ... if ( fscanf( Stream, "Version: %d\n",&tempInt) != 1 ) { printf("Unable to read version number\n"); return 0; } cs->Version = tempInt; ... } to one which allows us to bypass writing the configuration to disk and instead pass it directly in memory, roughly equivalent to this: static int LoadFromString(char *Stream, ConfigStructure *cs) A few things to note: The current LoadFromFile function is incredibly dense and complex, reading dozens of versions of the config file in a backward compatible manner, which makes duplication of the overall logic quite a pain. The functions that generate the config file and those that read it originate in totally different parts of the old system and therefore don't share any data structures so I can't pass those directly. I could potentially write a wrapper, but again, it would need to handle any structure passed in in a backwards compatible manner. I'm tempted to just pass the file as is in as a string (as in the prototype above) and convert all the fscanf's to sscanf's but then I have to handle incrementing the pointer along (and potentially dealing with buffer overrun errors) manually. This has to remain in C, so no C++ functionality like streams can help here Am I missing a better option? Is there some way to create a FILE * that actually just points to a location in memory instead of on disk? Any pointers, suggestions or other help is greatly appreciated.

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