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  • Collection wrapping a array is read-only. Possible to make it writeable without casting?

    - by Brian Triplett
    I have a Collection<T> property that wraps a array like T[] array; public Collection<T> Items { get { return new Collection<T>(array); } } When I attempt to assign to the collection via: T variable; Items[i] = variable; I get a NotSupportedException because the colleciton's IsReadOnly property is true. Turns out that this is a design choice by Microsoft. Does anyone know a workaround that does NOT involve enumeration? It could be done if the underlying data is not an array but I enjoy the performance gains because the data is fixed length.

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  • .Net Logger (Write your own vs log4net/enterprise logger/nlog etc.)

    - by Jack
    I work for an IT department with about 50+ developers. It used to be about 100+ developers but was cut because of the recession. When our department was bigger there was an ambitious effort made to set up a special architecture group. One thing this group decided to do was create our own internal logger. They thought it was such a simple task that we could spend recources and do it ourselves. Now we are having issues with performance and difficulty viewing the logs generated and some employees are frustrated that we are spending recources on infrastructure stuff like this instead of focusing on serving our business and using stuff that already exists like log4net or Enterprise Logger. Can you assist me in listing up reasons why you should not create your own .net logger. Also reasons for why you should are welcome to get a fair point of view :)

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  • How do I write JPA QL statements that hints to the runtime to use the DEFAULT value ?

    - by Jacques René Mesrine
    I have a table like so: mysql> show create table foo; CREATE TABLE foo ( network bigint NOT NULL, activeDate datetime NULL default '0000-00-00 00:00:00', ... ) In the domain object, FooVO the activeDate member is annotated as Temporal. If I don't set activeDate to a valid Date instance, a new record is inserted with NULLs. I want the default value to take effect if I don't set the activeDate member. Thanks.

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  • Write a program that allows the user to enter a string and then prints the letters of the String sep

    - by WM
    The output is always a String, for example H,E,L,L,O,. How could I limit the commas? I want the commas only between letters, for example H,E,L,L,O. import java.util.Scanner; import java.lang.String; public class forLoop { public static void main(String[] args) { Scanner Scan = new Scanner(System.in); System.out.print("Enter a string: "); String Str1 = Scan.next(); String newString=""; String Str2 =""; for (int i=0; i < Str1.length(); i++) { newString = Str1.charAt(i) + ","; Str2 = Str2 + newString; } System.out.print(Str2); } }

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  • JavaScript snippet to read and output XML file on page load?

    - by Banderdash
    Hey guys, hoping I might get some help. Have XML file here of a list of books each with unique id and numeral value for whether they are checked out or not. I need a JavaScript snippet that requests the XML file after the page loads and displays the content of the XML file. XML file looks like this: <?xml version="1.0" encoding="UTF-8" ?> <response> <library name="My Library"> <book id="1" checked-out="1"> <authors> <author>John Resig</author> </authors> <title>Pro JavaScript Techniques (Pro)</title> <isbn-10>1590597273</isbn-10> </book> <book id="2" checked-out="0"> <authors> <author>Erich Gamma</author> <author>Richard Helm</author> <author>Ralph Johnson</author> <author>John M. Vlissides</author> </authors> <title>Design Patterns: Elements of Reusable Object-Oriented Software</title> <isbn-10>0201633612</isbn-10> </book> ... </library> </response> Would LOVE any and all help!

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  • How can I write an XSLT that will recursively include other files?

    - by Eric
    Let's say I have a series of xml files in this format: A.xml: <page> <header>Page A</header> <content>blAh blAh blAh</content> </page> B.xml: <page also-include="A.xml"> <header>Page B</header> <content>Blah Blah Blah</content> </page> Using this XSLT: <xsl:stylesheet version="2.0" xmlns:xsl="http://www.w3.org/1999/XSL/Transform"> <xsl:template match="/page"> <h1> <xsl:value-of select="header" /> </h1> <p> <xsl:value-of select="content" /> </p> </xsl:template> </xsl:stylesheet> I can turn A.xml into this: <h1> Page A </h1> <p> blAh blAh blAh </p> But how would I make it also turn B.xml into this? <h1> Page B </h1> <p> Blah Blah Blah </p> <p> blAh blAh blAh </p> I know that I need to use document(concat(@also-include,'.xml')) somewhere, but I'm not sure where. Oh, and the catch is, I need this to still work if B were to be included in a third file, C.xml. Any idea as to how to do this?

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  • How do I write an alias for grep -R?

    - by numerodix
    I end up typing grep -Rni pattern . and awful lot. How do I make this into an alias like alias gr='grep -Rni $@ .' Running that gives: $ gr pattern grep: pattern: No such file or directory Even though the alias looks fine: $ type gr gr is aliased to `grep -R $@ .' It seems that the $@ and the . get swapped when it's actually executed.

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  • How can I write a Template.pm filter to generate PNG output from LaTeX source code?

    - by Sinan Ünür
    I am looking for a way of generating PNG images of equations from LATEX source code embedded in templates. For example, given: [% FILTER latex_display ] \begin{eqnarray*} \max && U(x,y) \\ \mathrm{s.t.} && p_x x + p_y y \leq I \\ && x \geq 0, y \geq 0 \end{eqnarray*} [% END %] I would like to get the output: <div class="latex display"><img src="equation.png" width="x" height="y"></div> which should ultimately display as: I am using ttree to generate documents offline. I know about Template::Plugin::Latex but that is geared towards producing actual documents out of LATEX templates. Any suggestions?

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  • How to use C to write a C compiler?

    - by israkir
    I am taking a compiler course this semester and we talked about this interesting thing in the class. Teacher used an example of p-code along with pascal to explain it. After google-ing a bit, I saw this phenomena is called self-hosting and naturally related to the first compilers. Ok, there is an interpreter which interprets the compiler source code written in its own language. But, there is still something missing in the explanations I found. I mean, there are some parts still looks mysterious (what about the interpreter? it is also a program, still need to be translated into machine code etc...) What I am asking you guys is that can you explain it as simple as possible or provide any online resource which you think that it explains this phenomena precisely..

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  • How can I write a file on an ftps-server with PHP?

    - by Daniel
    Hi, I hope someone here could help me, because I couldn't find any solution with Google. What I have to do is to generate a XML-string (that works) an save that directly into a file on an ftps-server. So far, so good... I used the following code with ftp and it works to, but not with ftps. So I either need another options-configuration for the stream or a different way to solve that task. Here my current code: $host = 'ftp.example.com'; $port = 22; $user = 'xxxxxx'; $pass = 'xxxxxx'; $file = 'test_' . time() . '.txt'; $ftpPath = sprintf('ftp://%s:%s@%s:%d/%s', $user, $pass, $host, $port, $file); $context = stream_context_create(array('ftp' = array('overwrite' = true))); file_put_contents($ftpPath, 'test', 0, $context);

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  • Should I write more SQL to be more efficient, or less SQL to be less buggy?

    - by RenderIn
    I've been writing a lot of one-off SQL queries to return exactly what a certain page needs and no more. I could reuse existing queries and issue a number of SQL requests linear to the number of records on the page. As an example, I have a query to return People and a query to return Job Details for a person. To return a list of people with their job details I could query once for people and then once for each person to retrieve their job details. I've found that in most cases that solution returns things in a reasonable amount of time, but I don't know how well it will scale in my environment. Instead I've been writing queries to join people + job details, or people + salary history, etc. I'm looking at my models and I see how I could shave off maybe 30% of my code if I were to re-use existing queries. This is a big temptation. Is it a bad thing to go for reuse over efficiency in general or does it all come down to the specific situation? Should I first do it the easy way and then optimize later, or is it best to get the code knocked out while everything is fresh in my mind? Thoughts, experiences?

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  • why it is not possible to modify file in a directory, where i have read/write group rights

    - by sighter
    I am currently messing around on my linux system and now i have the following situation. The directory /srv/http has the following permissions set: drwxrwxr-x 2 root httpdev 80 Jun 13 11:48 ./ drwxr-xr-x 6 root root 152 Mar 26 13:56 ../ -rwxrwxr-x 1 root httpdev 8 Jun 13 11:48 index.html* I have created the group httpdev before with the command: groupadd httpdev and added my user sighter with: gpasswd -a sighter httpdev Then i have set the permissions as above using the chown and chmod commands. But now i am not allowed to modify the index.html file or create a new file, as user sighter ,with touch like that: <sighter [bassment] ~http> touch hallo.php touch: cannot touch `hallo.php': Permission denied What do I understand wrong. I was expecting that i can do what i want there then the group has all the rights. The following Output is for your in formation. <sighter [bassment] ~http> cat /etc/group | grep sighter ... httpdev:x:1000:sighter ... The used linux-distro is archlinux. Thanks for all answers :) greetz Sascha

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  • What languages should a microISV use to write commercial software?

    - by Wal
    I've been writing software in Java for many years now, but it was always for internal applications that would be deployed to a server. I'd like to get into writing desktop applications now but I don't know where to start. I've written a few Java/Swing applications but again they were for internal use. My understanding is that Java and other semi-compiled and interpreted languages are too easy to reverse engineer, making them unsuitable for commercial software. I am aware that there are compilers for Java and some other interpreted language, but I've also heard that they are pricey and/or unreliable. Assuming I start a microISV and wish to develop and sell applications to a broad audience, what's my best bet? I would prefer something that can be written close to once, and compiled for different operating systems but I am not opposed to .NET and a Windows-only audience if other languages would compromise the experience (installation ease & user experience) in Windows. My only issue there is that I don't have a large starting budget and paying out the wazoo for the required development tools is not really in the cards.

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  • How do I read CalDAV objects from Google using python/django?

    - by user60626
    I've looked at vObject, iCalendar and the official list of CalDAV libraries, including 3 in python. However, I can't find any code that can get me an event object from a given CalDAV (i.e. google, exchange, etc.) server using a username/password. Most of the django calendar related code uses native code libraries and not WebDAV. An ideal python CalDAV client example would 1) use a given uid/pw, 2) obtain primary calendar and 3) obtain next appointment information (i.e. subject, location, start, end, etc.) Thanks!

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  • Access denied for pdf to read using itextsharp at server level..

    - by apekshabs
    Am facing error after uploadind to server... as access denied .... can anyone help me.... Document myDocument = new Document(PageSize.A5, 26, 72, 180, 180); string strUniqueFn = "onlineinvoice.pdf"; string imgpath = "logo.gif"; string strUser = Thread.CurrentPrincipal.Identity.Name.Substring(Thread.CurrentPrincipal.Identity.Name.IndexOf("\\") + 1).ToUpper(); string strFolder = Server.MapPath("."); System.IO.DirectoryInfo di = new System.IO.DirectoryInfo(strFolder); System.IO.FileInfo[] fi = di.GetFiles(strUser + "*.*"); for (i = 0; i <= fi.Length - 1; i++) { System.IO.File.Delete(strFolder + "\\" + strUniqueFn); } string strPath = strFolder + "\\" + strUniqueFn; PdfWriter pdfw = PdfWriter.GetInstance(myDocument, new FileStream(strPath, FileMode.Create)); string iPath = strFolder + "\\" + imgpath; pdfw.CloseStream = false; myDocument.Open(); ...................... myDocument.Close(); Am facing error at PdfWriter pdfw = PdfWriter.GetInstance(myDocument, new FileStream(strPath, FileMode.Create)); can anyone help me... Thank you

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  • how to include in web.config an external mydll.config file and read its values?

    - by firepol
    Hi, I found this answer about external configuration files. I'm trying to do a similar thing. I have a small webapplication called StatsGen I want to include in other projects, and for convenience I'd like to have the settings inside the bin folder, in a config file with an appropriate name, in my case: StatsGen.config. So I've put these line in the web.config (as explained in the answer I mentioned above): <configSections> <section name="StatsGenSettings" restartOnExternalChanges="true" type="System.Configuration.NameValueFileSectionHandler" /> <!--sectionGroups--> </configSections> <StatsGenSettings configSource="StatsGen.config"></StatsGenSettings> <!--and here comes the rest... appSettings etc.--> Inside the bin folder, I created a StatsGen.xml file, then renamed it to StatsGen.config. It looks like this: <?xml version="1.0" encoding="utf-8" ?> <StatsGenSettings> <add key="Password" value="myStatsPass" /> <add key="ConnectionString" value="Server=mydbsrv;Database=myDB;User ID=myUser;Password=myPass" /> </StatsGenSettings> I created an Helper class, as suggested in the answer. In the Page_Load of my default.aspx.cs file, I've put: goodPassword = StatsGenSettings.Instance["Password"]; When I load my page, I get this error: The type initializer for 'StatsGen.Helpers.StatsGenSettings' threw an exception. I've tried to exlude the helper and just to get access to the key, like this: NameValueCollection _settings = ConfigurationManager.GetSection("StatsGenSettings") as NameValueCollection; And I get this error: Unable to open configSource file 'StatsGen.config'. (C:\Users\pbo\Documents\Visual Studio 2010\Projects\StatsGen\StatsGen\web.config line 21) At line 21 I just have this, as explained above: <StatsGenSettings configSource="StatsGen.config"></StatsGenSettings> So now I'm wondering, what's wrong? Some detailed help would be cool... like: where exactly should I declare the StatsGenSettings element inside the web.config? It was not specified in the answer I've found... or what else am I doing wrong? Thanks for letting me know...

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  • Why does this code read all ' ' for the anything after the 4th character?

    - by djs22
    #define fileSize 100000 int main(int argc, char *argv[]){ char *name=argv[1]; char ret[fileSize]; FILE *fl = fopen(name, "rb"); fseek(fl, 0, SEEK_END); long len = fileSize; fseek(fl, 0, SEEK_SET); //fread(ret, 1, len, fl); int i; *(ret+fileSize) = '\0'; for (i=0; i<fileSize; i++){ *(ret+i)=fgetc(fl); printf("byte : %s \n", ret); } fclose(fl); } In the above code, when I feed the name of a jpeg file, it reads anything after the 4th character as ' '...any ideas? Thanks!

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  • How can I write a "user can only access own profile page" type of security check in Play Framework?

    - by karianneberg
    I have a Play framework application that has a model like this: A Company has one and only one User associated with it. I have URLs like http://www.example.com/companies/1234, http://www.example.com/companies/1234/departments, http://www.example.com/companies/1234/departments/employees and so on. The numbers are the company id's, not the user id's. I want that normal users (not admins) should only be able to access their own profile pages, not other people's profile pages. So a user associated with the company with id 1234 should not be able to access the URL http://www.example.com/companies/6789 I tried to accomplish this by overriding Secure.check() and comparing the request parameter "id" to the ID of the company associated with the logged in user. However, this obviously fails if the parameter is called anything else than "id". Does anyone know how this could be accomplished?

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