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  • BuiltIn Function to Convert from Hex String to Byte

    - by Ngu Soon Hui
    This question is similar to the one here. One can easily convert from hex string to byte via the following formula: public static byte[] HexStringToBytes(string hex) { byte[] data = new byte[hex.Length /2]; int j = 0; for (int i = 0; i < hex.Length; i+=2) { data[ j ] = Convert.ToByte(hex.Substring(i, 2), 16); ++j; } return data; } But is there a built-in function ( inside .net framework) for this?

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  • Handling duplicate nodes in XML

    - by JYelton
    Scenario: I am parsing values from an XML file using C# and have the following method: private static string GetXMLNodeValue(XmlNode basenode, string strNodePath) { if (basenode.SelectSingleNode(strNodePath) != null) return (basenode.SelectSingleNode(strNodePath).InnerText); else return String.Empty; } To get a particular value from the XML file, I generally pass the root node and a path like "parentnode/item" I recently ran into an issue where two nodes at the same document level share the same name. Question: What is the best way to get the values for duplicate-named nodes distinctly? My thought was to load all values matching the node name into an array and then using the array index to refer to them. I'm not sure how to implement that, though. (I'm not well-versed in XML navigation.)

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  • cross-user C# mutex

    - by Martin
    My app is forced to use a 3rd party module which will blue-screen Windows if two instances are started at the same time on the same machine. To work around the issue, my C# app has a mutex: static Mutex mutex = new Mutex(true, "{MyApp_b9d19f99-b83e-4755-9b11-d204dbd6d096}"); And I check if it's present - and if so I show an error message and close the app: bool IsAnotherInstanceRunning() { if (mutex.WaitOne(TimeSpan.Zero, true)) return (true); else return (false); } The problem is if two users can log in and open the application at the same time, and IsAnotherInstanceRunning() will return false. How do I get around this?

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  • Why does the data binding in this validation example work?

    - by MartyIX
    I'm wondering how exactly the XAML sample (MSDN sample) works: <Style x:Key="textBoxInError" TargetType="{x:Type TextBox}"> <Style.Triggers> <Trigger Property="Validation.HasError" Value="true"> <Setter Property="ToolTip" Value="{Binding RelativeSource={x:Static RelativeSource.Self}, Path=(Validation.Errors)[0].ErrorContent}"/> </Trigger> </Style.Triggers> </Style> Questions: (Validation.Errors)[0].ErrorContent - Is this code somehow checked by WPF? Because Validation.Errors may be an empty collection and in ordinary C# code this code may throw an exception. If this data-binding returns null for valid input - the null value is then casted to empty string (in a text control for example)? The index 0 corresponds to the first error message. How can I return more error messages from Validate method? Thank you for responses!

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  • Lookahead regex produces unexpected group

    - by Ivan Yatskevich
    I'm trying to extract a page name and query string from a URL which should not contain .html Here is an example code in Java: public class TestRegex { public static void main(String[] args) { Pattern pattern = Pattern.compile("/test/(((?!\\.html).)+)\\?(.+)"); Matcher matcher = pattern.matcher("/test/page?param=value"); System.out.println(matcher.matches()); System.out.println(matcher.group(1)); System.out.println(matcher.group(2)); } } By running this code one can get the following output: true page e What's wrong with my regex so the second group contains the letter e instead of param=value?

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  • Java Convert ColorSpace of BufferedImage to CS_GRAY without using ConvertColorOp

    - by gmatt
    I know its possible to convert an image to CS_GRAY using public static BufferedImage getGrayBufferedImage(BufferedImage image) { BufferedImageOp op = new ColorConvertOp(ColorSpace .getInstance(ColorSpace.CS_GRAY), null); BufferedImage sourceImgGray = op.filter(image, null); return sourceImgGray; } however, this is a chokepoint of my entire program. I need to do this often, on 800x600 pixel images and takes about 200-300ms for this operation to complete, on average. I know I can do this alot faster by using one for loop to loop through the image data and set it right away. The code above on the other hand constructs a brand new 800x600 BufferedImage that is gray scale. I would rather just transform the image I pass in. Does any one know how to do this with a for loop and given that the image is RGB color space?

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  • How to sort Map in Java

    - by kalpesh
    hi i want to sort map according to its key value plz see code below public static void main(String[] args) { SortedMap map = new TreeMap(); // Add some elements: map.put("2", "Two"); map.put("1", "One"); map.put("5", "Five"); map.put("4", "Four"); map.put("3", "Three"); map.put("10", "Ten"); map.put("12", "Twelve"); map.put("7", "Seven"); map.put("9", "Nine"); Iterator iterator = map.keySet().iterator(); while (iterator.hasNext()) { Object key = iterator.next(); System.out.println("key : " + key + " value :" + map.get(key)); } } Result Should come below key : 1 value :One key : 2 value :Two key : 3 value :Three key : 4 value :Four key : 5 value :Five key : 7 value :Seven key : 9 value :Nine key : 10 value :Ten key : 12 value :Twelve

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  • Cache Wrapper with expressions

    - by Fujiy
    I dont know if is possible. I want a class to encapsulate all Cache of my site. I thinking about the best way to do this to avoid conflict with keys. My first idea is something like this: public static TResult Cachear<TResult>(this Cache cache, Expression<Func<TResult>> funcao) { string chave = funcao.ToString(); if (!(cache[chave] is TResult)) { cache[chave] = funcao.Compile()(); } return (TResult)cache[chave]; } Is the best way? Ty

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  • MQ Connection - 2009 error

    - by user171523
    am connectting the MQ with below code. I am able connected to MQ successfully. My case is i place the messages to MQ every 1 min once. After disconnecting the cable i get a ResonCode error but IsConnected property still show true. Is this is the right way to check if the connection is still connected ? Or there any best pratcices around that. I would like to open the connection when applicaiton is started keep it open for ever. public static MQQueueManager ConnectMQ() { if ((queueManager == null) || (!queueManager.IsConnected)||(queueManager.ReasonCode == 2009)) { queueManager = new MQQueueManager(); } return queueManager; }

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  • Changing a limited user account in XP fails

    - by javamonkey79
    I have the following: using System; using System.DirectoryServices.AccountManagement; public class ChangePassword { public static void Main() { PrincipalContext context = new PrincipalContext(ContextType.Machine); UserPrincipal user = UserPrincipal.FindByIdentity(context, "someLimitedAccount"); user.ChangePassword( "xxx", "zzz" ); } } This works just fine with administrator accounts, but seems to crash like so when I try to change limited accounts in XP: Unhandled Exception: System.NullReferenceException: Object reference not set to an instance of an object. at ChangePassword.Main() Is what I am trying to do possible? If so, how? EDIT #1: I added the following: Console.WriteLine( "user: " + user ); Below this line: UserPrincipal user = UserPrincipal.FindByIdentity(context, "someLimitedAccount"); And I get this: user: It doesn't look like user is null when I print it, but then again I'm not really a .Net guy - I seem to remember this being expected behavior.

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  • Optimize C# Code Fragment

    - by Eric J.
    I'm profiling some C# code. The method below is one of the most expensive ones. For the purpose of this question, assume that micro-optimization is the right thing to do. Is there an approach to improve performance of this method? Changing the input parameter to p to ulong[] would create a macro inefficiency. static ulong Fetch64(byte[] p, int ofs = 0) { unchecked { ulong result = p[0 + ofs] + ((ulong)p[1 + ofs] << 8) + ((ulong)p[2 + ofs] << 16) + ((ulong)p[3 + ofs] << 24) + ((ulong)p[4 + ofs] << 32) + ((ulong)p[5 + ofs] << 40) + ((ulong)p[6 + ofs] << 48) + ((ulong)p[7 + ofs] << 56); return result; } }

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  • Jquery UI Dialog Weird Behavior in Firefox - Whole screen becomes non-clickable on second overlay

    - by Dondon Vizcayno
    I have two links that show up two modal dialogs. These dialogs are static divs in the html of the page with their own ids. When I click the first link, the first dialog shows up and behaves correctly. But when I click the second link, the whole screen grays out and everything becomes unclickable, including the second dialog. It happens also the other way around, clicking the second link, and then the first link. This problems occurs only in Firefox but not in IE. Any ideas why this is happening in Firefox?

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  • WPF window scrolling with top menu

    - by Greg R
    I'm running into a dilemma. When I make the ScrollViewer the main content object of my window, scrolling behaves exactly like I want it to. You resize to make it smaller than the content and the window and scroll bars appear. The problem comes in when I want the to menu to be static and the rest of content to be scrollable. I want the scroll bars to behave the same way as a browser window does, meaning when you resize it, the scroll bars appear based on the size of the content. When you expand the window, the content takes up the entire real estate of the window. Is that possible in WPF? Help would be GREATLY appreciated.

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  • Why doesn't this loop terminate?

    - by David
    Here's the sample code: public static void col (int n) { if (n % 2 == 0) n = n/2 ; if (n % 2 != 0) n = ((n*3)+1) ; System.out.println (n) ; if (n != 1) col (n) ; } this works just fine until it gets down to 2. then it outputs 2 4 2 4 2 4 2 4 2 4 infinitely. it seems to me that if 2 is entered as n then (n % 2 == 0) is true 2 will be divided by 2 to yeild 1. then 1 will be printed and since (n != 1) is false the loop will terminate. Why doesn't this happen?

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  • Are there any other Java schedulers besides Quartz(FOSS) and Flux(Commercial)

    - by mP
    I am interested in finding out about other job scheduling packages besides Quartz and Flux. Given the plethora of web frameworks i find it perculiar that there is really only one scheduler. Are there others that perhaps are very much unknown/unpopular ? Spring Batch Not really a scheduling solution but rather a batch job coordinator etc. http://static.springsource.org/spring-batch/faq.html#schedulers How does Spring Batch differ from Quartz? Is there a place for them both in a solution? Spring Batch and Quartz have different goals. Spring Batch provides functionality for processing large volumes of data and Quartz provides functionality for scheduling tasks. So Quartz could complement Spring Batch, but are not excluding technologies. A common combination would be to use Quartz as a trigger for a Spring Batch job using a Cron expression and the Spring Core convenience SchedulerFactoryBean .

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  • Can I programatically determine if a PNG is animated?

    - by alex
    I have PNG (as well as JPEG) images uploaded to my site. They should be static (i.e. one frame). There is such thing as APNG. (it will be animated in Firefox). According to the Wikipedia article... APNG hides the subsequent frames in PNG ancillary chunks in such a way that APNG-unaware applications would ignore them, but there are otherwise no changes to the format to allow software to distinguish between animated and non-animated images. Does this mean it is impossible to determine if a PNG is animated with code? If it is possible, can you please point me in the right direction PHP wise (GD, ImageMagick)?

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  • TCPClient in C# (Error).

    - by CSharp
    using System; using System.Text; using System.IO; using System.Net.Sockets; namespace ConsoleApp01 { class Program { public static void Main(string[] args) { TcpClient client = new TcpClient("python.org",80); NetworkStream ns = client.GetStream(); StreamWriter sw = new StreamWriter(ns); sw.Write("HEAD / HTTP/1.1\r\n" + "User-Agent: Test\r\n" + "Host: www.python.org\r\n" + "Connection: Close\r\n"); sw.Flush(); Console.ReadKey(true); } } } System.Net.Sockets.SocketException: Unable to make a connection because the target machine actively refused it at System.Net.Sockets.TcpClient..ctor at ConsoleApp01.Program.Main :line 12 Why do i get this error message?

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  • I have a bunch of divs floated left, lined up in columns with different heights. They dont create a

    - by Roeland
    Hey guys, I am trying to create a grid like system with div's with content floated left. The problem is that the height of each div is not static since the content is different in each one. Since the height is different.. things get outta whack if one is taller then another in one row. Is there some sort of css way or js (prefer javascript) way to get around this. I really want to avoid setting large heights on the divs to get them to line up. You can see the example here: http://www.foreclosurejournalinc.com/index.php?option=com_hotproperty&view=type&id=1

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  • java - POST vs JDBC

    - by Dan
    OK so here's the code: import java.io.BufferedReader; import java.io.InputStreamReader; import java.net.URL; public class Main { public static void main(String[] args) { try { URL my_url = new URL("http://www.viralpatel.net/blogs/"); BufferedReader br = new BufferedReader(new InputStreamReader(my_url.openStream())); String strTemp = ""; while(null != (strTemp = br.readLine())){ System.out.println(strTemp); } } catch (Exception ex) { ex.printStackTrace(); } } } Using this method I can use POST and GET methods using PHP scripts. I can then use the PHP scripts to the MySQL database which in turn outputs back to the java applet. Is this possible? (and safer?) Thanks.

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  • Conversion of VB Code to Delphi

    - by Bharat
    Hi, While searching in the net i got few lines of code in VB for extracting an image from EMF File. I tried to convert that into Delphi but doesnt work. Help me in converting this code to delphi. Public Function CallBack_ENumMetafile(ByVal hdc As Long, _ ByVal lpHtable As Long, _ ByVal lpMFR As Long, _ ByVal nObj As Long, _ ByVal lpClientData As Long) As Long Dim PEnhEMR As EMR Dim PEnhStrecthDiBits As EMRSTRETCHDIBITS Dim tmpDc As Long Dim hBitmap As Long Dim lRet As Long Dim BITMAPINFO As BITMAPINFO Dim pBitsMem As Long Dim pBitmapInfo As Long Static RecordCount As Long lRet = PlayEnhMetaFileRecord(hdc, ByVal lpHtable, ByVal lpMFR, ByVal nObj) RecordCount = RecordCount + 1 CopyMemory PEnhEMR, ByVal lpMFR, Len(PEnhEMR) Select Case PEnhEMR.iType Case 1 'header RecordCount = 1 Case EMR_STRETCHDIBITS CopyMemory PEnhStrecthDiBits, ByVal lpMFR, Len(PEnhStrecthDiBits) pBitmapInfo = lpMFR + PEnhStrecthDiBits.offBmiSrc CopyMemory BITMAPINFO, ByVal pBitmapInfo, Len(BITMAPINFO) pBitsMem = lpMFR + PEnhStrecthDiBits.offBitsSrc tmpDc = CreateDC("DISPLAY", vbNullString, vbNullString, ByVal 0&) hBitmap = CreateDIBitmap(tmpDc, _ BITMAPINFO.bmiHeader, _ CBM_INIT, _ ByVal pBitsMem, _ BITMAPINFO, _ DIB_RGB_COLORS) lRet = DeleteDC(tmpDc) End Select CallBack_ENumMetafile = True End Function

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  • P/Invoke a Function Passed a StringBuilder

    - by andrew
    in a C# file i have a class Archiver { [DllImport("Archiver.dll")] public static extern void archive(string data, StringBuilder response); } string data is an input, and StringBuilder response is where the function writes something the archive function prototype (written in C) looks like this: void archive(char * dataChr, char * outChr); and it receives a string in dataChr, and then does a strcpy(outChr,"some big text"); from C# i call it something like this: string message = "some text here"; StringBuilder response = new StringBuilder(10000); Archiver.archive(message,response); this works, but the problem, as you might see is that i give a value to the StringBuilder size, but the archive function might give back a (way) larger text than the size i've given to my StringBuilder. any way to fix this?

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  • What's the smartest way to organize SVN for translated versions of the same project?

    - by brandonjp
    I apologize because I know this has been covered over and over again, but I'm trying to understand the smartest way to cleverly use subversion to our benefit. (*Note: I know our method is not the BEST way to handle localized versions, but external factors are forcing us to work this way on current projects) We have a fairly static website in English...html, css, js, etc. After the site comes back from the translator we will have 5 variations of the same code (this week...then potentially 25 more in the future!). So we'll soon have a folder for EN, FR, SP, DE, etc. Most files (css, js, img) will remain exactly the same; and html files (structure, id's, classes) will only vary based on the localized text inside the elements. Is there any way to use clever SVN folder structuring that would help us out in the event that if a small change is needed, we don't have to manually change the files in each and every translated version of the site? Thanks! --bp

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  • Twitter date unparseable?

    - by Andreas
    Hi, I want to convert the date string in a Twitter response to a Date object, but I always get a ParseException and I cannot see the error!?! Input string: Thu Dec 23 18:26:07 +0000 2010 SimpleDateFormat Pattern: EEE MMM dd HH:mm:ss ZZZZZ yyyy Method: public static Date getTwitterDate(String date) { SimpleDateFormat sf = new SimpleDateFormat(TWITTER); sf.setLenient(true); Date twitterDate = null; try { twitterDate = sf.parse(date); } catch (Exception e) {} return twitterDate; } I also tried this: http://friendpaste.com/2IaKdlT3Zat4ANwdAhxAmZ but that gives the same result. I use Java 1.6 on Mac OS X. Cheers, Andi

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  • Suggestion to reverse string in c#

    - by HasanGursoy
    Is this the right method to reverse a string? I'm planning to use it to reverse a string like: Products » X1 » X3 to X3 « X1 « Products I want it to be a global function which can be used elsewhere. public static string ReverseString(string input, string separator, string outSeparator) { string result = String.Empty; string[] temp = Regex.Split(input, separator, RegexOptions.IgnoreCase); Array.Reverse(temp); for (int i = 0; i < temp.Length; i++) { result += temp[i] + " " + outSeparator + " "; } return result; }

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  • How do I structure a GWT project?

    - by smaye81
    Hello, I have followed the basic GWT tutorial for creating a project in Eclipse. Now, I am trying to build off what I learned in the tutorial. I created a static utility class to perform some database connection logic. However, when I try to compile I get: [ERROR] Line 46: No source code is available for type com.sample.server.ConnectionUtil; did you forget to inherit a required module? Where can I put simple classes that I've created on my own? Do they have to be outside the package structure of the basic module, 'com.sample'? Or do I have to specify a whole new module in the gwt.xml file and inherit from that? There has to be something simple I'm missing.

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