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• Running non-existing jar does not cause any expection/error

  - by Nikolay Kuznetsov

  Please, consider the following snippet which is being run from Eclipse. Even though the external jar file does not exist no Exception is thrown and process is not null. Why is it so? try { Process process = Runtime.getRuntime().exec("java -jar NonExisting.jar"); if (process == null) System.out.println("process = null"); else System.out.println(process); } catch (IOException e) { System.err.println(e); } It prints java.lang.ProcessImpl@1a4d139 If I run it manully from command line then there is an error: C:\Users\workspace\Project\src>java -jar NonExisting.jar Error: Unable to access jarfile NonExisting.jar

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• How to condense onclick code to be dynamic

  - by opbeta

  I am trying to get this onclick function code to be dynamic. I do not want to have 50 blocks of code for all the states. He is a quick snippet of the code var Ohio=function(){ document.getElementById('texas').style.display='none'; document.getElementById('florida').style.display='none'; document.getElementById('ohio').style.display='block'; } and so on and so forth..... How would I go about condensing this to make it smaller and dynamic?

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• File Encrypt/Decrypt under load?

  - by chopps

  I found an interesting article about encrypting and decrypting files but since it uses a file.dat to store the key this will run into problems when theres alot of users on the site dealing with alot of files. http://www.codeproject.com/KB/security/VernamEncryption.aspx?display=Print Should a new file be created every time a file needs decrypting or would there be a better way to do this? UPDATE: Here is what im using to avoid the locking problems. using (Mutex FileLock = new Mutex(true, System.Guid.NewGuid().ToString())) { try { FileLock.WaitOne(); using (FileStream fs = new FileStream(keyFile, FileMode.Open)) { keyBytes = new byte[fs.Length]; fs.Read(keyBytes, 0, keyBytes.Length); } } catch (Exception ex) { EventLog.LogEvent(ex); } finally { FileLock.ReleaseMutex(); } } I tested it on 1000 TIFFs doing both encryption and decryption without any errors.

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• Why doesn't this list comprehension do what I expect it to do?

  - by Az

  The original list project_keys = sorted(projects.keys()) is [101, 102, 103, 104, 105, 106, 107, 108, 109, 110] where the following projects were deemed invalid this year: 108, 109, 110. Thus: for project in projects.itervalues(): # The projects dictionary is mapped to the Project class if project.invalid: # Where invalid is a Bool parameter in the Project class project_keys.remove(project.proj_id) print project_keys This will return a list of integers (which are project id's) as such: [101, 102, 103, 104, 105, 106, 107] Sweet. Now, I wanted it try the same thing using a list comprehension. project_keys = [project_keys.remove(project.proj_id) for project in projects.itervalues() if project.invalid print project_keys This returns: [None, None, None] So I'm populating a list with the same number as the removed elements but they're Nones? Can someone point out what I'm doing wrong? Additionally, why would I use a list comprehension over the for-if block at the top? Conciseness? Looks nicer?

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• JQuery response is null but actual response is not

  - by Paul Petrick

  I'm using JQuery to make an Ajax call. I used a sniffer to catch the response text: {"error_code":0,"message":"SUCCESS","data":{"session_token":"3efd9dde-a839-4e91-9415-4c2f6cba5b7b"}} But the response returned on the success callback is null. Anyone got any ideas? (see jquery code below. Jquery code: $.ajax({ type: "GET", url: "http://184.72.58.99/matchaapi/API/User/Login", data: { email: emailval, password: pwordval, developer_key: devkey }, dataType: "json", cache: false, beforeSend: function(xhr) { xhr.setRequestHeader( "Content-Type", "application/json; charset=utf-8" ); }, success: function(resp) { alert(resp); $("#status p").html(resp.message); }});

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• JQuery with SMARTY php

  - by out_sider

  This might seem a very noob question but I haven't found the answer yet. I have a header.tpl file which contains xhtml code. I want to and some java script to it using jquery. But my problem is that it simple doesn't happen what I tell it to do. Because the page hoster comiples php with SMARTY I had to make a small change to the block script, which was had the {literal} {/literal}. But the rest seems ok. Btw the jquery.js is on the same folder as the header.tpl. File header.tpl http://feupload.fe.up.pt/get/SQWJvybQkDCmjEG PS: I event replaced all the code by the getstarted tutorial on the jquery homepage and added the {literlar} {/literal} (otherwise it would give an error) and it steel didn't work

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• How can two threads access a common array of buffers with minimal blocking ? (c#)

  - by Jelly Amma

  Hello, I'm working on an image processing application where I have two threads on top of my main thread: 1 - CameraThread that captures images from the webcam and writes them into a buffer 2 - ImageProcessingThread that takes the latest image from that buffer for filtering. The reason why this is multithreaded is because speed is critical and I need to have CameraThread to keep grabbing pictures and making the latest capture ready to pick up by ImageProcessingThread while it's still processing the previous image. My problem is about finding a fast and thread-safe way to access that common buffer and I've figured that, ideally, it should be a triple buffer (image[3]) so that if ImageProcessingThread is slow, then CameraThread can keep on writing on the two other images and vice versa. What sort of locking mechanism would be the most appropriate for this to be thread-safe ? I looked at the lock statement but it seems like it would make a thread block-waiting for another one to be finished and that would be against the point of triple buffering. Thanks in advance for any idea or advice. J.

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• Determine cluster size of file system in Python

  - by Philip Fourie

  I would like to calculate the "size on disk" of a file in Python. Therefore I would like to determine the cluster size of the file system where the file is stored. How do I determine the cluster size in Python? Or another built-in method that calculates the "size on disk" will also work. I looked at os.path.getsize but it returns the file size in bytes, not taking the FS's block size into consideration. I am hoping that this can be done in an OS independent way...

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• Help with calling a secure (SSL) webservice in Android.

  - by mmattax

  I'm new to Android and am struggling to make a call to an SSL web service for an Android Application. My code is as follows: Log.v("fs", "Making HTTP call..."); HttpClient http = new DefaultHttpClient(); HttpGet request = new HttpGet("https://example.com/api"); try { String response = http.execute(request, new BasicResponseHandler()); Log.v("fs", response); } catch (Exception e) { Log.v("fs", e.toString()); } The Output is: Making HTTP call... javax.net.SSLPeerUnverifiedException: No peer certificate Any suggestions to make this work would be great. EDIT I should note that this is a valid cert. It is not self-signed.

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• ClassCastException in webclient

  - by narendra

  I am using web client for getting page source. First time i am getting page source. After i use the same object for getting page source for different URL it's showing an Exception like: java.lang.ClassCastException: com.gargoylesoftware.htmlunit.UnexpectedPage cannot be cast to com.gargoylesoftware.htmlunit.html.HtmlPage This is the code which i am using. HtmlPage firstPage = webClient.getPage("firsturl"); HtmlPage downloadPage = null; try { webClient.setJavaScriptEnabled(true); downloadPage = (HtmlPage) webClient.getPage("secondurl"); } catch (Exception e) { e.printStackTrace(); } Thx in advance

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• Regexp look-behind to match internet speeds

  - by Sandman

  So the user may search for "10 mbit" after which I want to capture the "10" so I can use it in a speed-search rather than a string-search. This isn't a problem, the below regexp does this fine: if (preg_match("/(\d+)\smbit/", $string)){ ... } But, the user may search for something like "10/10 mbit" or "10-100 mbit". I don't want to match those with the above regexp - they should be handled in another fashion. So I would like a regexp that matches "10 mbit" if the number is all-numeric as a whole word (i.e. contained by whitespace, newline or lineend/linestart) Using lookbehind, I did this: if (preg_match("#(?<!/)(\d+)\s+mbit#i", $string)){ Just to catch those that doesn't have "/" before them, but this matched true for this string: "10/10 mbit" so I'm obviously doing something wrong here, but what?

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• How can a client try to reconnect to a server after a first failed try with WCF?

  - by djerry

  Hey guys, I'm using a client - server app. When a client starts, he gets a login-screen. When the server is not up yet, the call to the server will throw an exception which i catch (EndpointNotFoundException). I show a messagebox telling the user the server is offline. When he tries to reconnect again, it will throw another exception (CommunicationObjectFaultedException), even though the server is online. When a new client starts then, he can connect to the server. But the client who attempted before, still gets the error. My question now is how can the first client login after a failed first try without having to start his program again. So i want to clear the communicationchannel of its faulted state or something like that. Thanks in advance.

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• Flex Builder 3 executing old source codes

  - by Gorro

  I'm facing this problem again and again, but can't find any solution (except mine, which is not as a good one I guess). Don't know why, sometimes Flex Builder executes old source codes after making changes. While debugging I see how it steps through a source (e.g. changing local variables) which does not exist (even if I delete all that block or function). My way to solve that is to delete the project (backing up the source codes of course) and create a new one, add the backed up sources to the project and rebuild. It starts to work as it should work, but this way is not as comfortable, especially if sources are on a remote machine and you need to configure .net back-end. Anyone knows how to solve?

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• How to populate gridview on button_click after searching from access database?

  - by Usman

  I am creating a form in c#.net . I want to populate the gridview only on button click with entries meeting search criteria. I have tried but on searching ID it works but on searching FirstName it gives error plz check SQL also. My Code behind private void button1_Click(object sender, EventArgs e) { try { string strConn = "Provider=Microsoft.ACE.OLEDB.12.0;Data Source=L:/New project/Project/Project/Data.accdb"; string sql = "SELECT * FROM AddressBook WHERE FirstName='" + textBox1.Text.ToString(); OleDbConnection connection = new OleDbConnection(strConn); OleDbDataAdapter dataadapter = new OleDbDataAdapter(sql, connection); DataSet ds = new DataSet(); connection.Open(); dataadapter.Fill(ds, "AddressBook"); connection.Close(); dataGridView1.DataSource = ds; dataGridView1.DataMember = "AddressBook"; } catch (System.Exception err) { this.label27.Visible = true; this.label27.Text = err.Message.ToString(); } }

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• mounting without -o loop

  - by jumpinjoe

  Hi, I have written a dummy (ram disk) block device driver for linux kernel. When the driver is loaded, I can see it as /dev/mybd. I can successfully transfer data onto it using dd command, compare the copied data successfully. The problem is that when I create ext2/3 filesystem on it, I have to use -o loop option with the mount command. Otherwise mount fails with following result: mount: wrong fs type, bad option, bad superblock on mybd, missing codepage or helper program, or other error What could be the problem? Please help. Thanks.

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• Timeout LinqToSql inserting millions of records

  - by Bas

  I'm inserting approximently 3 million records in a database using this solution. Eventually when the application has been inserting records for a while (my last run lasted around 4 hours), it gives a timeout with the following SqlException: "SqlExcepetion: Timeout expired. The timeoutperiod elapsed prior to completion of the operation or the server is not responding." What's the best way to handle this exception? Is there a way to prevent this from happening or should I catch the exception? Thanks in advance!

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• "Ambiguous template specialization" problem

  - by Setien

  I'm currently porting a heap of code that has previously only been compiled with Visual Studio 2008. In this code, there's an arrangement like this: template <typename T> T convert( const char * s ) { // slow catch-all std::istringstream is( s ); T ret; is >> ret; return ret; } template <> inline int convert<int>( const char * s ) { return (int)atoi( s ); } Generally, there are a lot of specializations of the templated function with different return types that are invoked like this: int i = convert<int>( szInt ); The problem is, that these template specializations result in "Ambiguous template specialization". If it was something besides the return type that differentiated these function specializations, I could obviously just use overloads, but that's not an option. How do I solve this without having to change all the places the convert functions are called?

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• Force php through the .net engine in iis7

  - by Rippo

  I have converted a php to asp.net mvc and have it hosted with the Rackspace cloud. All works great apart from some php links are still linked from other sites and within search engines. My question is what do I need to add to my web.config to force php sites to go through the .net engine? These links work as expected as I can catch the 404 and redirect where need be:- http://www.securahome.net/myjunk.info http://www.securahome.net/myjunk.phpp However this one doesn't:- http://www.securahome.net/myjunk.php I have spoken to Rackspace cloud and they say "its not possible as IIS doesn't recognize php files. You can setup mime types to handle them" This however makes no sense and I think they did not understand the problem. Does anyone have a solution?

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• static setter method injection in Spring

  - by vishnu

  Hi, I have following requirement I wanted to pass http:\\localhost:9080\testws.cls value as setter injection through spring configuration file. How can i do this static variable setter injection for WSDL_LOCATION public class Code1 extends javax.xml.ws.Service { private final static URL CODE1_WSDL_LOCATION; static { URL url = null; try { url = new URL("http:\\localhost:9080\testws.cls"); } catch (MalformedURLException e) { e.printStackTrace(); } CODE1_WSDL_LOCATION = url; } public Code1(URL wsdlLocation, QName serviceName) { super(wsdlLocation, serviceName); } public Code1() { super(CODE1_WSDL_LOCATION, new QName("http://tempuri.org", "Code1")); } /** * * @return * returns Code1Soap */ @WebEndpoint(name = "Code1Soap") public Code1Soap getCode1Soap() { return (Code1Soap)super.getPort(new QName("http://tempuri.org", "Code1Soap"), Code1Soap.class); } } Please help me out.

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• Download file using java apache commons?

  - by Kyle

  How can I use the library to download a file and print out bytes saved? I tried using import static org.apache.commons.io.FileUtils.copyURLToFile; public static void Download() { URL dl = null; File fl = null; try { fl = new File(System.getProperty("user.home").replace("\\", "/") + "/Desktop/Screenshots.zip"); dl = new URL("http://ds-forums.com/kyle-tests/uploads/Screenshots.zip"); copyURLToFile(dl, fl); } catch (Exception e) { System.out.println(e); } } but I cannot display bytes or a progress bar. Which method should I use?

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• Referring to a non-final variable data inside an inner class

  - by shoaibmohammed

  Im doing a program in GWT. Here is the snippet where Im having problem private String[] populateRSSData() { 1==>> String[] data = null; try { new RequestBuilder(RequestBuilder.GET, "../database.php?action=populaterss").sendRequest(null, new RequestCallback() { @Override public void onResponseReceived(Request request, Response response) { 2==>> data=response.getText().split("~"); } @Override public void onError(Request request, Throwable exception) { Window.alert(exception.getMessage()); } }); } catch (RequestException e) { Window.alert(e.getMessage()); } return data; } Now the problem arises that I get an error that the variable 1==>> data should be declared final. But if I declare it as final then i cannot store the datas in 2==>> The error i get Cannot refer to a non-final variable data inside an inner class defined in a different method RSS_Manager.java Please suggest

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• Client-side session timeout redirect in ASP.Net

  - by Mercury821

  I want to build a way to automatically redirect users to Timeout.aspx when their session expires due to inactivity. My application uses forms authentication and relies heavily on update panels within the same aspx page for user interaction, so I don't want to simply redirect after a page-level timer expires. For the same reason, I can't use '<meta http-equiv="refresh"/>' What I want to do is create a simple ajax web service with a method called IsSessionTimedOut(), that simply returns a boolean. I will use a javascript timer to periodically call the method, and if it returns true, then redirect to Timeout.aspx. However, I don't want calling this method to reset the session timeout timer, or the session would never time out because of the service call. Is there a clean way to avoid this catch-22? Hopefully there is an easy solution that has so far eluded me.

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• How to Convert Date(from date time input field) to another date format in C#?

  - by Saeed Khan

  I have Date time input field from where I am taking date and converting it to another format, my code for that try { DateTime dt = dtiFrom.Value.Date; string format = "DD-MM-YYYY"; // Use this format MessageBox.Show(dt.ToString(format)); // here its shows result as DD-10-YYYY DateTime dt1 = Convert.ToDateTime(dt.ToString(format)); // here Error "The string was not recognized as a valid DateTime. There is an unknown word starting at index 0." } catch (Exception ee) { MessageBox.Show(ee.Message, "Error Message!"); } I am not able to convert date according to my format. please could any body help me in code or suggest me some code. thanks in advance

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• Simplest way of creating java next/previous buttons

  - by Holly

  I know that when creating buttons, like next and previous, that the code can be somewhat long to get those buttons to function. My professor gave us this example to create the next button: private void jbtnNext_Click() { JOptionPane.showMessageDialog(null, "Next" ,"Button Pressed", JOptionPane.INFORMATION_MESSAGE); try { if (rset.next()) { fillTextFields(false); }else{ //Display result in a dialog box JOptionPane.showMessageDialog(null, "Not found"); } } catch (SQLException ex) { ex.printStackTrace(); } } Though, I do not really understand how that short and simple if statement is what makes the next button function. I see that the fillTextFields(false) uses a boolean value and that you need to initialize that boolean value in the beginning of the code I believe. I had put private fillTextFields boolean = false; but this does not seem to be right... I'm just hoping someone could explain it better. Thanks :)

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• How to get flash player to display under content on a PC?

  - by bschaeffer

  Long story short, I'm developing a theme template for a blog that enables you to view the posts in blocks. The main part of the post is displayed at first, then the secondary content is displayed over that when you hover over the post block. Everything works fine on a Mac Versions of all major browsers, but start browsing on a PC, and all hell breaks loose when you start trying to display content over Flash Video embeds. The flash element remains visible over the content. It's completely unusable. From a PC, you can view an example of the problem here: http://photorific.tumblr.com I'm almost certain this is a bug in the Flash Plugin for Windows, but I was wondering if anyone else had come across this problem before, and if there were any solutions. This problem has presented itself for a while now and any help would be really, really, really appreciated!

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