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Articles indexed Sunday April 18 2010

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  • C++ std::vector capacity

    - by aaa
    hi. does vector::operator= change vector capacity? if so, how? does copy constructor copy capacity? I looked through documentation but could not find specific answer. is it implementation dependent? Thanks

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  • focusout not triggering when clicking on another selector with a click

    - by Sean
    I have 2 divs that each have clicks bound to them. when you click on a div a form is displayed (in another div) that allows you to set properties specific to the div that is clicked. I'm using focusout to save the properties to a data object. everything is working perfectly except when i click on the other div. it seems that the click handler on the other div cancels out the focusout of the form field. Has anyone else experienced this? is so what is the proper way to overcome this?

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  • alternative ways to blockwrite ?

    - by radick
    hi all is there any alternate ways to blockwrite ? now in my app i am using it like this BlockWrite(file, buffer[1], Length(buffer)); i want to know alternate ways writing string to an exe file(binary ) just want to know different methods :) can any one help me thanks in advance

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  • Graph and permutation problem

    - by user319771
    I have a graph (with nodes and edges) containing symmetry and a group of permutations to label the nodes so no edges are changed (automorphisms). Now I would like to determine for which nodes a permutation exchanges two equivalent (i.e. nodes with the same color or symmetry class) neighboring nodes. When the nodes with equivalent neighbors stay the same, simply checking if the neighbors are exchanged in the permutation is enough. However, when the nodes with equivalent neighbors are also permuted (i.e. there are multiple nodes with the same color/symmetry class with the same equivalent neighbors), the problem becomes more complex. Is there any known algorithm for such a problem? Some remarks: The graph has no coordinates, it's a topology only

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  • Linux Mplayer Instead of flash any distro/browser

    - by data_jepp
    The thing is that flash sucks for linux on 64-bit, performance vice. Due to this I actually download every clip to a temp folder and play the file while it's being downloaded with mplayer. This works really nice. Flash is not to play a video. Does there exist a plugin for this for any browser? I tried google, but I can't find the right words to search for.

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  • How to install Ubuntu, Windows XP and Windows 7 from scratch as triple-boot system

    - by simon
    I'm currently running Windows XP, but have ordered Windows 7. I want to keep Windows XP on a separate partition, and install Ubuntu as well. In which order should I install the OSs, and is there anything differing from an ordinary single-system install I should keep in mind? For example, does the order of partition make any difference? If I want to have the system drive as "C:" drive in both Win XP and Win 7, what should I do?

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  • How to start application from C# application?

    - by Mohamed
    hi all, how can i start any application from C# i mean for example, if i have an openfiledialog and the user opened it and selected any file and opened it, i need this file to opened in its application whatever its extension and its default start application. i have googled and found that Process.Start takes the file name and its application but i don't know what is the type of the file the user is going o open thanks in advance for any replies.

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  • Using Microsoft.Office.Interop to save created file with C#

    - by Eyla
    I have the this code that will create excel file and work sheet then insert same values. The problem I'm facing that I'm not able to save the file with name giving ten colse it. I used SaveAs but did not work: wb.SaveAs(@"C:\mymytest.xlsx", missing, missing, missing, missing, missing, XlSaveAsAccessMode.xlExclusive, missing, missing, missing, missing, missing); this line of code would give me this error: Microsoft Office Excel cannot access the file 'C:\A3195000'. There are several possible reasons: • The file name or path does not exist. • The file is being used by another program. • The workbook you are trying to save has the same name as a currently open workbook. please advice to solve this problem. here is my code: private void button1_Click(object sender, EventArgs e) { Microsoft.Office.Interop.Excel.Application xlApp = new Microsoft.Office.Interop.Excel.Application(); if (xlApp == null) { MessageBox.Show("EXCEL could not be started. Check that your office installation and project references are correct."); return; } xlApp.Visible = true; Workbook wb = xlApp.Workbooks.Add(XlWBATemplate.xlWBATWorksheet); Worksheet ws = (Worksheet)wb.Worksheets[1]; if (ws == null) { MessageBox.Show("Worksheet could not be created. Check that your office installation and project references are correct."); } // Select the Excel cells, in the range c1 to c7 in the worksheet. Range aRange = ws.get_Range("C1", "C7"); if (aRange == null) { MessageBox.Show("Could not get a range. Check to be sure you have the correct versions of the office DLLs."); } // Fill the cells in the C1 to C7 range of the worksheet with the number 6. Object[] args = new Object[1]; args[0] = 6; aRange.GetType().InvokeMember("Value", BindingFlags.SetProperty, null, aRange, args); // Change the cells in the C1 to C7 range of the worksheet to the number 8. aRange.Value2 = 8; // object missing = Type.Missing; // wb.SaveAs(@"C:\mymytest.xlsx", missing, missing, missing, missing, //missing, XlSaveAsAccessMode.xlExclusive, missing, missing, missing, missing, //missing); }

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  • Can someone explain me the parameter RETURN_VALUE ?

    - by Ronnie Chester Lynwood
    hello. I want to know what does RETURN_VALUE means! I'm stucked at this thing. how to use RETURN_VALUE on MSSQL SP ? thanks.. ASP: Set cmdDB = Server.CreateObject("ADODB.Command") With cmdDB .ActiveConnection = ADOConM .CommandText = "usp_jaljava_member_select" .CommandType = adCmdStoredProc .Parameters.Append .CreateParameter("RETURN_VALUE", adInteger, adParamReturnValue, 0) .Parameters.Append .CreateParameter("@TLoginName", adVarChar, adParamInput, 15,lcase(TLoginName)) .Parameters.Append .CreateParameter("@TPassword", adVarChar, adParamInput, 20,TPassword) .Parameters.Append .CreateParameter("@retval", adVarChar, adParamOutput, 50) ' .Parameters.Append .CreateParameter("@TPinCode", adVarChar, adParamInput, 15,TPinCode) .Execute,,adExecuteNoRecords RetVal = .Parameters("@retval") Ret = Trim(.Parameters("RETURN_VALUE")) 'Set .ActiveConnection = Nothing End With Set cmdDB = Nothing UTid = RetVal MSSQL SP: CREATE PROCEDURE usp_jaljava_member_select @TLoginName varchar(15), @TPassword varchar(20), @retval varchar(50) OUTPUT --@TPinCode varchar(15) AS

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  • OpenGL/GLSL checking if shader compiled fine on intel cards

    - by clamp
    hello, i am using this code to check if my glsl shader compiled fine. glGetObjectParameterivARB(obj, GL_OBJECT_INFO_LOG_LENGTH_ARB, &infologLength); if (infologLength > 1) { int charsWritten = 0; char * const infoLog = new char[infologLength]; glGetInfoLogARB(obj, infologLength, &charsWritten, infoLog); tError(infoLog, false); delete infoLog; } } the length of the returned string is empty on nvidia and ATI cards, but on intel cards this one returns the string "no errors." now what is the best way to find out, if there are really no errors? should i just check for this string? or is there a convention what this function glGetInfoLogARB should return?

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  • What are some best practices for structuring cherrypy apps?

    - by Omega
    I'm writing a cherrypy app and I was wondering what the best way is for structuring my handlers and code for larger applications? I realize assignment is simple trough cherrypy.root, but what are some practices for writing the handlers and assigning them? (Allow me to prove my confusion!) My initial thought is to write a standard handler class that infers a template to run based on the current URL or class/method combination. Then I would assign one instance of that handler multiple times to the path to create pages. I don't see this working however as the recursive references wouldn't work quite right. So, given the fact that I'm already drawing blanks on how my own source code should look, I'd love some pointers and examples! Feel free to ask some detailed questions for me to clarify. While there is plenty of cherrypy tutorial material out there, it tends to only scratch the surface.

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  • How to prepare for a Java test?

    - by Zenzen
    Ok so in two days I have a test for my dream job (well it's an internship, but still!) and for quite some time now I've been reading the SCJP Guide book in order to prepare myself. BUT seeing how slow my reading speed is I guess finding a website with some "java essentials" or "standard java test questions" and going through it in those 2 days would be a better idea. Don't misunderstand me, I do have java experience and it's "only" an internship, but we all know how programming tests look like and how tricky they can be. So are there any online resources you could recommend me? I know 2 days is not much, but well I was informed bout the test 1-2days ago.

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  • Why are ASP.Net MVC2 area controller actions callable without including the area in the url path?

    - by Nathan Ridley
    I've just installed Visual Studio 2010 and have created a new MVC2 project so that I can learn about the changes and updates and have discovered an issue with areas that I'm not sure what to make of. I created a new EMPTY MVC2 project I right clicked the project and, from the context menu, added a new area called "Test" In the new test area, I added a controller called "Data". The code is: public class DataController : Controller { // // GET: /Test/Data/ public ActionResult Index() { Response.Write("Hi"); return new EmptyResult(); } } Now, I compile and call this address: http://localhost/mytest/test/data and get the output: Hi All good. Now I call this: http://localhost/mytest/data and get the same response! I thought routing was supposed to take care of this? Am I overlooking something? Or has the default project setup for MVC2 overlooked something?

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  • What is the difference among NSString alloc:initWithCString versus stringWithUTF8String?

    - by mobibob
    I thought these two methods were (memory allocation-wise) equivalent, however, I was seeing "out of scope" and "NSCFString" in the debugger if I used what I thought was the convenient method (commented out below) and when I switched to the more explicit method my code stopped crashing! Notice that I am getting the string that is being stored in my container from sqlite3 query. p = (char*) sqlite3_column_text (queryStmt, 1); // GUID = (NSString*) [NSString stringWithUTF8String: (p!=NULL) ? p : ""]; GUID = [[NSString alloc] initWithCString:(p!=NULL) ? p : "" encoding:NSUTF8StringEncoding]; Also note, that if I looked at the values in the debugger and printed them with NSLog they looked correct, however, I don't think new memory was allocated and the value copied. Instead the memory pointer was stored - went out of scope - referenced later - crash!

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  • How to run script from command-line

    - by Eric
    I want to write a script that counts the types of objects there are in the ZODB, when they were created, how many users have joined since a given point in time,etc. I am wondering how to accomplish this. So, was wondering if there is a way to pass a script to bin/instance to be executed. I've created this script with a py script but it takes a VERY long time to finish and this is why I would like to do this from the command-line... in the hopes of it running faster. Thanks ERic

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  • Code Golf: Evaluating Mathematical Expressions

    - by Noldorin
    Challenge Here is the challenge (of my own invention, though I wouldn't be surprised if it has previously appeared elsewhere on the web). Write a function that takes a single argument that is a string representation of a simple mathematical expression and evaluates it as a floating point value. A "simple expression" may include any of the following: positive or negative decimal numbers, +, -, *, /, (, ). Expressions use (normal) infix notation. Operators should be evaluated in the order they appear, i.e. not as in BODMAS, though brackets should be correctly observed, of course. The function should return the correct result for any possible expression of this form. However, the function does not have to handle malformed expressions (i.e. ones with bad syntax). Examples of expressions: 1 + 3 / -8 = -0.5 (No BODMAS) 2*3*4*5+99 = 219 4 * (9 - 4) / (2 * 6 - 2) + 8 = 10 1 + ((123 * 3 - 69) / 100) = 4 2.45/8.5*9.27+(5*0.0023) = 2.68... Rules I anticipate some form of "cheating"/craftiness here, so please let me forewarn against it! By cheating, I refer to the use of the eval or equivalent function in dynamic languages such as JavaScript or PHP, or equally compiling and executing code on the fly. (I think my specification of "no BODMAS" has pretty much guaranteed this however.) Apart from that, there are no restrictions. I anticipate a few Regex solutions here, but it would be nice to see more than just that. Now, I'm mainly interested in a C#/.NET solution here, but any other language would be perfectly acceptable too (in particular, F# and Python for the functional/mixed approaches). I haven't yet decided whether I'm going to accept the shortest or most ingenious solution (at least for the language) as the answer, but I would welcome any form of solution in any language, except what I've just prohibited above! My Solution I've now posted my C# solution here (403 chars). Update: My new solution has beaten the old one significantly at 294 chars, with the help of a bit of lovely regex! I suspected that this will get easily beaten by some of the languages out there with lighter syntax (particularly the funcional/dynamic ones), and have been proved right, but I'd be curious if someone could beat this in C# still. Update I've seen some very crafty solutions already. Thanks to everyone who has posted one. Although I haven't tested any of them yet, I'm going to trust people and assume they at least work with all of the given examples. Just for the note, re-entrancy (i.e. thread-safety) is not a requirement for the function, though it is a bonus. Format Please post all answers in the following format for the purpose of easy comparison: Language Number of characters: ??? Fully obfuscated function: (code here) Clear/semi-obfuscated function: (code here) Any notes on the algorithm/clever shortcuts it takes.

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  • How to store a file on a server(web container) through a Java EE web application?

    - by Yatendra Goel
    I have developed a Java EE web application. This application allows a user to upload a file with the help of a browser. Once the user has uploaded his file, this application first stores the uploaded file on the server (on which it is running) and then processes it. At present, I am storing the file on the server as follows: try { FormFile formFile = programForm.getTheFile(); // formFile represents the uploaded file String path = getServlet().getServletContext().getRealPath("") + "/" + formFile.getFileName(); System.out.println(path); file = new File(path); outputStream = new FileOutputStream(file); outputStream.write(formFile.getFileData()); } where, the formFile represents the uploaded file. Now, the problem is that it is running fine on some servers but on some servers the getServlet().getServletContext().getRealPath("") is returning null so the final path that I am getting is null/filename and the file doesn't store on the server. When I checked the API for ServletContext.getRealPath() method, I found the following: public java.lang.String getRealPath(java.lang.String path) Returns a String containing the real path for a given virtual path. For example, the path "/index.html" returns the absolute file path on the server's filesystem would be served by a request for "http://host/contextPath/index.html", where contextPath is the context path of this ServletContext. The real path returned will be in a form appropriate to the computer and operating system on which the servlet container is running, including the proper path separators. This method returns null if the servlet container cannot translate the virtual path to a real path for any reason (such as when the content is being made available from a .war archive). So, Is there any other way by which I can store files on those servers also which is returning null for getServlet().getServletContext().getRealPath("")

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  • Want procmail to run a custom python script, everytime a new mail shows up

    - by Maddy
    I have a pretty usual requirement with procmail but I am unable to get the results somehow. I have procmailrc file with this content: :0 * ^To.*@myhost | /usr/bin/python /work/scripts/privilege_emails_forward.py Wherein my custom python script(privilege_emails_forward.py) will be scanning through the email currently received and do some operations on the mail content. But I am unable to get the script getting executed at the first shot(let alone scanning through the mail content). Is this a correct way of invoking an external program(python) as soon as new mail arrives? And how does my python program(privilege_emails_forward.py) will receive the mail as input? I mean as sys.argv or stdin????

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  • Any MVVM frameworks work well with NavigationWindows?

    - by Will
    I'd like to "throw away" the current version of a WPF application and move version 2 to a stable MVVM framework. The main concern I'm having is that I don't see much talk about MVVM frameworks and navigation (i.e., NavigationWindows and Frames). My current app relies heavily on Pages to present views to the user. I would prefer to keep it this way. I'd rather not change everything to UserControls and rely on DataTemplates to switch out the view I need to present. Are there any MVVM frameworks that: Work well with NavigationWindows and Pages Provide ViewModels adequate access to the navigation process Provide the ability to change navigation in response to security-related events (e.g., redirect to login Page after logout)

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