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  • fread and fwrite are not recommended for use with structured data

    - by forest58
    A book beginning linux programming 3ed says "Note that fread and fwrite are not recommended for use with structured data.Part of the problem is that files written with fwrite are potentially nonportable between different machines." What does that mean exactly? what calls should I use if I want to write a portable structured data reader or writer? direct system calls?

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  • Use of text() function when using xPath in dom4j

    - by jlawless
    I have inherited an application that parses xml using dom4j and xPath: The xml being parsed is similar to the following: <cache> <content> <transaction> <page> <widget name="PAGE_ID">WRK_REGISTRATION</widget> <widget name="TRANS_DETAIL_ID">77145</widget> <widget name="GRD_ERRORS" /> </page> <page> <widget name="PAGE_ID">WRK_REGISTRATION</widget> <widget name="TRANS_DETAIL_ID">77147</widget> <widget name="GRD_ERRORS" /> </page> <page> <widget name="PAGE_ID">WRK_PROCESSING</widget> <widget name="TRANS_DETAIL_ID">77152</widget> <widget name="GRD_ERRORS" /> </page> </transaction> </content> </cache> Individual Nodes are being searched using the following: String xPathToGridErrorNode = "//cache/content/transaction/page/widget[@name='PAGE_ID'][text()='WRK_DNA_REGISTRATION']/../widget[@name='TRANS_DETAIL_ID'][text()='77147']/../widget[@name='GRD_ERRORS_TEMP']"; org.dom4j.Element root = null; SAXReader reader = new SAXReader(); Document document = reader.read(new BufferedInputStream(new ByteArrayInputStream(xmlToParse.getBytes()))); root = document.getRootElement(); Node gridNode = root.selectSingleNode(xPathToGridErrorNode); where xmlToParse is a String of xml similar to the excerpt provided above. The code is trying to obtain the GRD_ERROR node for the page with the PAGE_ID and TRANS_DETAIL_ID provided in the xPath. I am seeing an intermittent (~1-2%) failure (returned node is null) of this selectSingleNode request even though the requested node is in the xml being searched. I know there are some gotchas associated with using text()= in xPath and was wondering if there was a better way to format the xPath string for this type of search.

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  • Detecting and handling third-party library filehandle leaks in Java

    - by tucuxi
    Is there any way to detect and handle whether a Java library is correctly releasing file-handles (via "close") from within a Java program that is using said library, short of having access to the actual library code and inserting the corresponding "finally close" statements? If detection is feasible, is there any way to close those file-handles without a reference to the Reader (or FileInputStream) that was reading the file?

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  • C# Find out what column caused the Sql Exception

    - by PaN1C_Showt1Me
    Hi. I'm getting an exception from SQL Data Reader (MS SQL as datastore) and I'd like to know which column name causes this Exception to be thrown. But I cannot find it in the InnerException.. nowhere. ((System.InvalidOperationException)ex.InnerException).StackTrace: System.Data.SqlClient.SqlDataReader.ReadColumnHeader(Int32 i) System.Data.SqlClient.SqlDataReader.IsDBNull(Int32 i) ... Where is it hidden please ?

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  • Looking for a good C++ based RSS API

    - by Rhubarb
    I tried http://code.google.com/p/feed-reader-lib but holy cow, talk about difficult to build. It has a nightmare of dependencies on Xerces and Xalan, both of which seem to be choking under the new VisualStudio 2010 C++ compiler. I've wasted hours trying to build this thing which is a shame. Does anyone have anything a little easier to hit the ground running with?

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  • How do I detect server status in a port scanner java implementation

    - by akz
    I am writing a port scanner in Java and I want to be able to distinct the following 4 use cases: port is open port is open and server banner was read port is closed server is not live I have the following code: InetAddress address = InetAddress.getByName("google.com"); int[] ports = new int[]{21, 22, 23, 80, 443}; for (int i = 0; i < ports.length; i++) { int port = ports[i]; Socket socket = null; try { socket = new Socket(address, port); socket.setSoTimeout(500); System.out.println("port " + port + " open"); BufferedReader reader = new BufferedReader( new InputStreamReader(socket.getInputStream())); String line = reader.readLine(); if (line != null) { System.out.println(line); } socket.close(); } catch (SocketTimeoutException ex) { // port was open but nothing was read from input stream ex.printStackTrace(); } catch (ConnectException ex) { // port is closed ex.printStackTrace(); } catch (IOException e) { e.printStackTrace(); } finally { if (socket != null && !socket.isClosed()) { try { socket.close(); } catch (Exception e) { e.printStackTrace(); } } } } The problem is that I get a ConnectionException both when the port is closed and the server cannot be reached but with a different exception message: java.net.ConnectException: Connection timed out: connect when the connection was never established and java.net.ConnectException: Connection refused: connect when the port was closed so I cannot make the distinction between the two use cases without digging into the actual exception message. Same thing happens when I try a different approach for the socket creation. If I use: socket = new Socket(); socket.setSoTimeout(500); socket.connect(new InetSocketAddress(address, port), 1000); I have the same problem but with the SocketTimeoutException instead. I get a java.net.SocketTimeoutException: Read timed out if port was open but there was no banner to be read and java.net.SocketTimeoutException: connect timed out if server is not live or port is closed. Any ideas? Thanks in advance!

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  • Does close ever throw an IOException?

    - by TofuBeer
    After providing some answers here, and reading some comments, it would seem that, in practice IOException is never thrown on close for file I/O. Are there any cases in which calling close on a Stream/Reader/Writer actually throws an IOException? If an exception is actually thrown, how should it be dealt with?

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  • SharePoint List Service Recursive not working

    - by stranger001
    Hi, I am using the following code to retrieve the documents in a list. Its working fine. However, it only returns documents and folders in root of the doc library. Is there any thing wrong I am doing here? I am looking for files in sub folders with recursive mode. Service service = new Service(); service.setMaintainSession(true); call = (Call) service.createCall(); call.setTargetEndpointAddress( new java.net.URL("<host>/_vti_bin/lists.asmx") ); call.setOperationName(new QName("http://schemas.microsoft.com/sharepoint/soap/","GetListItems")); call.setProperty(Call.SOAPACTION_USE_PROPERTY, new Boolean("true")); call.setProperty(Call.SOAPACTION_URI_PROPERTY,"http://schemas.microsoft.com/sharepoint/soap/GetListItems"); call.addParameter(new javax.xml.namespace.QName("http://schemas.microsoft.com/sharepoint/soap/", "listName"), new javax.xml.namespace.QName("http://www.w3.org/2001/XMLSchema", "string"), java.lang.String.class, javax.xml.rpc.ParameterMode.IN); MessageElement me = new MessageElement(new QName("QueryOptions")); me.addChildElement(new MessageElement(new QName( "IncludeMandatoryColumns"))).addTextNode("true"); me.addChildElement(new MessageElement(new QName( "ViewAttributes"))).addAttribute(javax.xml.soap.SOAPFactory.newInstance().createName("Scope"), "Recursive"); MessageElement[] me1 = {me}; String strMyString = "" + "<Query>" + "<OrderBy><FieldRef Name=\"ows_Modified\" Ascending=\"TRUE\" /></OrderBy>" + "</Query>"; MessageElement[] meArray = { getMeFromString(strMyString) };// Array call.addParameter("query",org.apache.axis.Constants.XSD_SCHEMA, javax.xml.rpc.ParameterMode.IN); call.addParameter("queryOptions",org.apache.axis.Constants.XSD_SCHEMA, javax.xml.rpc.ParameterMode.IN); call.setReturnType(org.apache.axis.Constants.XSD_SCHEMA); Schema ret = (Schema)call.invoke(new Object[] {"listGUID",meArray, me1 }); public org.apache.axis.message.MessageElement getMeFromString(final String strMyString) { DocumentBuilder docBuilder = null; try { docBuilder = DocumentBuilderFactory.newInstance().newDocumentBuilder(); } catch (final ParserConfigurationException e) { e.printStackTrace(); } catch (final FactoryConfigurationError e) { e.printStackTrace(); } final StringReader reader = new StringReader(strMyString); final InputSource inputsource = new InputSource(reader); Document doc = null; try { doc = docBuilder.parse(inputsource); } catch (final SAXException e) { e.printStackTrace(); } catch (final IOException e) { e.printStackTrace(); } final Element ele = doc.getDocumentElement(); final MessageElement msg = new MessageElement(ele); return msg; }

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  • Scala: can't write setter without getter?

    - by IttayD
    This works: class ButtonCountObserver { private var cnt = 0 // private field def count = cnt // reader method def count_=(newCount: Int) = cnt = newCount // writer method // ... } val b = new ButtonCountObserver b.count = 0 But this doesn't class ButtonCountObserver { private var cnt = 0 // private field def count_=(newCount: Int) = cnt = newCount // writer method // ... } val b = new ButtonCountObserver b.count = 0 I get: error: value count is not a member of ButtonCountObserver Is it possible to create a setter (with the syntactic sugar) without a getter?

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  • Handling extra newlines in csv files parsed with Python?

    - by rmihalyi
    I have a CSV file that contains extra newlines in some fields, e.g.: A, B, C, D, E, F 123, 456, tree , very, bla, indigo I tried the following: import csv catalog = csv.reader(open('test.csv', 'rU'), delimiter=",", dialect=csv.excel_tab) for row in catalog: print "Length: ", len(row), row and the result I got was this: Length: 6 ['A', ' B', ' C', ' D', ' E', ' F'] Length: 3 ['123', ' 456', ' tree'] Length: 4 [' ', ' very', ' bla', ' indigo'] Does anyone have any idea how I can quickly remove extraneous newlines? Thanks!

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  • How to set HTML list as mx:DataGrid data provider?

    - by Ole Jak
    So I have Html like this http://trac.edgewall.org/wiki/RecentChanges (I want to create some Flash Track reader which will be opensource) I need to list in my DataGrid Index of all viki pages in form like +-----------+--------+ |page name |page url| +-----------+--------+ | name | url | +-----------+--------+

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  • How to display content of one site in another using PHP?

    - by Joyan
    Hello I'm trying to show contents of two websites in one another , someone suggest me to use RSS reader but my question is : is there anything else i could try to show the contents , beside using rss !? i thought i can connect to the database of another website , but that didnt work / thanks in advance

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  • How to read expected child nodes of a given node from schema in PHP?

    - by MartyIX
    I was wondering if there's an implementation of a XML schema reader that for an arbitrary node in XML schema provides list of nodes which are supposed to be present as child nodes of given node, restrictions on nodes and so on. I'm planning to program it for my purposes but I would like to know if it isn't solved somewhere. I really need only a small subset what I described above. Thanks for tips!

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  • XMLReader : how to catch syntax errors in the xml file ?

    - by mishal153
    Hi, I have an XML file with syntax errors. eg. <Viewport thisisbad Left="0" Top="0" Width="1280" Height="720" > When i create an XML reader it does not throw any errors. I there a way to do syntax checking automatically, like XMLDocument does ? I have tried setting various XmlReaderSettings flags but found nothing useful.

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