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  • How did Perl gain a reputation for being a write-only language?

    - by Andrew Grimm
    How did Perl gain a reputation (deserved, undeserved, or used to be deserved, no longer so) of being a "write only language"? Was it The syntax of the language Specific features that were available in the language Specific features not being available in the language (or at least old versions of it) The kind of tasks Perl was being used for The kind of people who use Perl (people who aren't full-time programmers) Criticism from people committed to another language Something else? Background: I'd like to know if some aspects that gave Perl the reputation of being write-only also apply to other languages (specifically ruby). Disclaimer: I recognise that Perl doesn't force people to do write-only code (can any language?), and that you can write bad code in any language.

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  • C# System.Diagnostics.Debugger.Debug() stopped working

    - by Andrew Miner
    I'm working on a program which uses the System.Diagnostics.Debugger.Break() method to allow the user to set a breakpoint from the command-line. This has worked fine for many weeks now. However, when I was working on fixing a unit test today, I tried to use the debug switch from the command-line, and it didn't work. Here's what I've tried: I've confirmed that the Debug() method is really being called (by putting a System.Console.WriteLine() after it) I've confirmed that the build is still in Debug I've done a clean build I've restarted Product Studio A quick Google search didn't reveal anything, and the API documentation for .Net doesn't mention anything about this function not performing correctly. So... any ideas?

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  • Use a grepped file as an included source in bash

    - by Andrew
    I'm on a shared webhost where I don't have permission to edit the global bash configuration file at /ect/bashrc. Unfortunately there is one line in the global file, mesg y, which puts the terminal in tty mode and makes scp and similar commands unavailable. My local ~./bashrc includes the global file as a source, like so: # Source global definitions if [ -f /etc/bashrc ]; then . /etc/bashrc fi My current workaround uses grep to output the global file, sans offending line, into a local file and use that as a source. # Source global definitions if [ -f /etc/bashrc ]; then grep -v mesg /etc/bashrc > ~/.bash_global . ~/.bash_global fi Is there a way to do include a grepped file like this without the intermediate step of creating an actual file? Something like this? . grep -v mesg /etc/bashrc > ~/.bash_global

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  • Java Operator Precedence Comparison

    - by Andrew
    Does java have a built-in method to compare precedence of two operators? For example, if I have a char '/' and a char '+' is there a method I can call that compares the two and returns true/false if the first is greater than the second (e.g. true)?

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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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  • Javascript code for handling Form behaviour.

    - by Andrew
    Hello, Here's how the situation looks : I have a couple simple forms <form action='settings.php' method='post'> <input type='hidden' name='setting' value='value1'> <input type='submit' value='Value1'> </form> Other small forms close to it have value2, value3, ... for the specific setting1, etc. Now, I have all these forms placed on the settings.php subpage, but I'd also like to have copies of one or two of them on the index.php subpage (for ease of access, as they are in certain situations rather frequently used). Thing is I do not want those forms based on the index.php to redirect me in any way to settings.php, just post the hidden value to alter settings and that's all. How can I do this with JS ? Cheers

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  • XML structure question

    - by Andrew Jahn
    I have a basic XML object that I'm working with. I can't figure out how to access the parts of it. EX:<br> <pre><code> < FacetsData> < Collection name="CDDLALL" type="Group"> < SubCollection name="CDDLALL" type="Row"> < Column name="DPDP_ID">D0230< /Column> < Column name="Count">9< /Column> < /SubCollection> < SubCollection name="CDDLALL" type="Row"> < Column name="DPDP_ID">D1110< /Column> < Column name="Count">9< /Column> < /SubCollection> < /Collection> < /FacetsData> (PS: I can't get this damn xml to format so people can read it) What I need to do is check each DPDP_ID and if its value is D0230 then I leave the Count alone, all else I change the Count to 1. What I have so far: node = doc.DocumentElement; nodeList = node.SelectNodes("/FacetsData/Collection/SubCollection"); for (int x = 0; x < nodeList.Count; x++) { if (nodeList[x].HasChildNodes) { for (int i = 0; i < nodeList[x].ChildNodes.Count; i++) { //This part I can't figure out how to get the name="" part of the xml //MessageBox.Show(oNodeList[x].ChildNodes[i].InnerText); get the "D0230","1" //part but not the "DPDP_ID","Count" part. } } }

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  • Practical Experience using Stripes?

    - by Andrew Whitehouse
    I am coming from an Enterprise Java background which involves a fairly heavyweight software stack, and have recently discovered the Stripes framework; my initial impression is that this seems to do a good job of minimising the unpleasant parts of building a web application in Java. Has anyone used Stripes for a project that has gone live? And can you share your experiences from the project? Also, did you consider any other technologies and (if so) why did you chose Stripes?

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  • Multiple Questions per page using Drupal Quiz

    - by Andrew
    I'm using the Drupal Quiz module, and have setup some basic quizzes and stuff like that. However some further customization is required, involving more than 1 question per page, and a multi-type answer in this type of format: Question 1: Describe 4 things you did last summer a) [ short answer space - text field ] b) "I wept" c) "My whole family died so I learned self reliance" d) "I got another xbox" Question 2: Describe 2 things you hate about yourself a) "My arms are way shorter than my legs" b) "I was born without human emotion" So I guess in two parts, how to show multiple questions per page, and then how to allow multiple text fields for answers. Oh and this quiz is not graded, it's like a self assessment. Thanks!

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  • How would i down-sample a .wav file then reconstruct it using nyquist? - in MATLAB

    - by Andrew
    This is all done in MATLAB 2010 My objective is to show the results of: undersampling, nyquist rate/ oversampling First i need to downsample the .wav file to get an incomplete/ or impartial data stream that i can then reconstuct. Heres the flow chart of what im going to be doing So the flow is analog signal - sampling analog filter - ADC - resample down - resample up - DAC - reconstruction analog filter what needs to be achieved: F= Frequency F(Hz=1/s) E.x. 100Hz = 1000 (Cyc/sec) F(s)= 1/(2f) Example problem: 1000 hz = Highest frequency 1/2(1000hz) = 1/2000 = 5x10(-3) sec/cyc or a sampling rate of 5ms This is my first signal processing project using matlab. what i have so far. % Fs = frequency sampled (44100hz or the sampling frequency of a cd) [test,fs]=wavread('test.wav'); % loads the .wav file left=test(:,1); % Plot of the .wav signal time vs. strength time=(1/44100)*length(left); t=linspace(0,time,length(left)); plot(t,left) xlabel('time (sec)'); ylabel('relative signal strength') **%this is were i would need to sample it at the different frequecys (both above and below and at) nyquist frequency.*I think.*** soundsc(left,fs) % shows the resaultant audio file , which is the same as original ( only at or above nyquist frequency however) Can anyone tell me how to make it better, and how to do the sampling at verious frequencies?

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  • GDI+ Rotated sub-image

    - by Andrew Robinson
    I have a rather large (30MB) image that I would like to take a small "slice" out of. The slice needs to represent a rotated portion of the original image. The following works but the corners are empty and it appears that I am taking a rectangular area of the original image, then rotating that and drawing it on an unrotated surface resulting in the missing corners. What I want is a rotated selection on the original image that is then drawn on an unrotated surface. I know I can first rotate the original image to accomplish this but this seems inefficient given its size. Any suggestions? Thanks, public Image SubImage(Image image, int x, int y, int width, int height, float angle) { var bitmap = new Bitmap(width, height); using (Graphics graphics = Graphics.FromImage(bitmap)) { graphics.TranslateTransform(bitmap.Width / 2.0f, bitmap.Height / 2.0f); graphics.RotateTransform(angle); graphics.TranslateTransform(-bitmap.Width / 2.0f, -bitmap.Height / 2.0f); graphics.DrawImage(image, new Rectangle(0, 0, width, height), x, y, width, height, GraphicsUnit.Pixel); } return bitmap; }

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  • what does the @ symbol mean in ls -l directory listing?

    - by Andrew Arrow
    When I run ls -l on my mac I see two .yml files: -rw-r--r-- 1 aa staff 6 Apr 15 05:50 s1.yml -rw-r--r--@ 1 aa staff 362 Apr 15 05:49 s3.yml same owner, same permissions but one has a @ at the end of the permisions. The one with the @ shows up in my editor, the one without does not. So there must be some significance. How can I turn on the @ for the file without it? I selected the files in the finder and did get info and everything looks identical between the two files.

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  • How do I get the server hostname from a mounted directory with cocoa/obj-c?

    - by Andrew
    Currently when I open a file with my program I can select files on a server by clicking on the server name in the sidebar in an NSOpenPanel and then selecting the file. No problem, this works fine for using the file as long as the shared directory is mounted. I get a path like "/Volumes/SHARENAME/filename.bla". My question is how do I get the server hostname of the computer it came from. For instance, if I clicked on the device with name SERVERNAME under "Shared" in the NSOpenPanel how do I get SERVERNAME from "/Volumes/SHARENAME/filename.bla". I have looked at quite a bit of documentation and have been unable to find a solution for this problem. Any help toward this will be greatly appreciated. Thank you.

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  • CoGetClassObject gives many First-chance exceptions in ATL project. Should I worry?

    - by Andrew
    Hello, I have written a COM object that in turn uses a thrid party ActiveX control. In my FinalConstruct() for my COM object, I instantiate the ActiveX control with the follow code: HRESULT hRes; LPCLASSFACTORY2 pClassFactory; hRes = CoInitializeEx(NULL,COINIT_APARTMENTTHREADED); bool bTest = SUCCEEDED(hRes); if (!bTest) return E_FAIL; if (SUCCEEDED(CoGetClassObject(__uuidof(SerialPortSniffer), CLSCTX_INPROC_SERVER, NULL, IID_IClassFactory2, (LPVOID *)(&pClassFactory)))) { ... more set up code When I step over the line if (SUCCEEDED(CoGetClassObject(__uuidof(SerialPortSniffer), ..., I get 20+ lines in the Output window stating: First-chance exception at 0x0523f82e in SillyComDriver.exe: 0xC0000005: Access violation writing location 0x00000000. I also get the lines: First-chance exception at 0x051e3f3d in SillyComDriver.exe: 0xC0000096: Privileged instruction. First-chance exception at 0x100ab9e6 in SillyComDriver.exe: 0xC000001D: Illegal Instruction. Notice these are first-chance exceptions. The program runs as expected I can access the third party methods/properties. Still, I'm left wondering why they are occurring. Perhaps my way of instantiating the ActiveX control (for which I want use of it's methods/properties and not it's GUI stuff) is incorrect? Besides the code I'm showing, I also put the line import "spsax.dll" no_namespace in the stdafx.h That's all the code necessary for my simple demo project. I noticed this problem because I had (inadvertently) set the "break on exceptions" options in my "real" project and it was breaking on this line. Once I removed it, it also works. If you're read this far thank you, and perhaps I can ask one other minor question. In my demo project, if I right click on SerialPortSniffer and "go to definition", it takes me to the file C:....\AppData\Local\Temp\spsax.tlh. Can someone explain that? Finally, in my "real" project, right clicking on SerialPortSniffer and going to difinition leads to "The symbol 'SerialPortSniffer' is not defined". It doesn't seem to affect the program though. Is there some setting I've messed up? By the way, all my code is written w/ VS2008. Thanks, Dave

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  • Selenium RC: How to assert an element contains text and any number of other elements?

    - by Andrew
    I am using Selenium RC and the PHPUnit Selenium Extension. I am trying to assert that a table row exists, with the content that I expect, while making it flexible enough to be reused. Thanks to this article, I figured out a way to select the table row, asserting that it contains all the text that I expect. $this->assertElementPresent("css=tr:contains(\"$text1\"):contains(\"$text2\")"); But now I would like to assert that a specific radio button appears in the table row also. Here's the element that I would like to assert that is within the table row. (I am currently asserting that it exists using XPath. I'm sure I could do the same using CSS). $this->assertElementPresent("//input[@type='radio'][@name='Contact_ID'][@value='$contactId']"); Currently I have a function that can assert that a table row exists which contains any number of texts, but I would like to add the ability to specify any number of elements and have it assert that the table row contains them. How can I achieve this? /** * Provides the ability to assert that all of the text appear in the same table row. * @param array $texts */ public function assertTextPresentInTableRow(array $texts) { $locator = 'css=tr'; foreach ($texts as $text) { $locator .= ":contains(\"$text\")"; } $this->assertElementPresent($locator); }

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  • Linking to an item in another node (XSLT)

    - by Andrew Parisi
    I have an XML document with companies listed in it. I want to create a link with XSLT that contains the <link> child of the next node. Sorry if this is confusing..here is some sample XML of what i'm trying to obtain: <portfolio> <company> <name>Dano Industries</name> <link>dano.xml</link> </company> <company> <name>Mike and Co.</name> <link>mike.xml</link> </company> <company> <name>Steve Inc.</name> <link>steve.xml</link> </company> </portfolio> I want two links, "BACK" and "NEXT". While currently on mike.xml, I want BACK to link to "dano.xml" and NEXT linked to "steve.xml"...etc..and have it dynamically change when on a different page based on the nodes around it. I want to do this because I may add and change the list as I go along, so I don't want to have to manually re-link everything. How can I obtain this? Sorry I am new to XSLT, so please explain with solution if possible! Thanks in advance!

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  • polymorphism, inheritance in c# - base class calling overridden method?

    - by Andrew Johns
    This code doesn't work, but hopefully you'll get what I'm trying to achieve here. I've got a Money class, which I've taken from http://www.noticeablydifferent.com/CodeSamples/Money.aspx, and extended it a little to include currency conversion. The implementation for the actual conversion rate could be different in each project, so I decided to move the actual method for retrieving a conversion rate (GetCurrencyConversionRate) into a derived class, but the ConvertTo method contains code that would work for any implementation assuming the derived class has overriden GetCurrencyConversionRate so it made sense to me to keep it in the parent class? So what I'm trying to do is get an instance of SubMoney, and be able to call the .ConvertTo() method, which would in turn use the overriden GetCurrencyConversionRate, and return a new instance of SubMoney. The problem is, I'm not really understanding some concepts of polymorphism and inheritance yet, so not quite sure what I'm trying to do is even possible in the way I think it is, as what is currently happening is that I end up with an Exception where it has used the base GetCurrencyConversionRate method instead of the derived one. Something tells me I need to move the ConvertTo method down to the derived class, but this seems like I'll be duplicating code in multiple implementations, so surely there's a better way? public class Money { public CurrencyConversionRate { get { return GetCurrencyConversionRate(_regionInfo.ISOCurrencySymbol); } } public static decimal GetCurrencyConversionRate(string isoCurrencySymbol) { throw new Exception("Must override this method if you wish to use it."); } public Money ConvertTo(string cultureName) { // convert to base USD first by dividing current amount by it's exchange rate. Money someMoney = this; decimal conversionRate = this.CurrencyConversionRate; decimal convertedUSDAmount = Money.Divide(someMoney, conversionRate).Amount; // now convert to new currency CultureInfo cultureInfo = new CultureInfo(cultureName); RegionInfo regionInfo = new RegionInfo(cultureInfo.LCID); conversionRate = GetCurrencyConversionRate(regionInfo.ISOCurrencySymbol); decimal convertedAmount = convertedUSDAmount * conversionRate; Money convertedMoney = new Money(convertedAmount, cultureName); return convertedMoney; } } public class SubMoney { public SubMoney(decimal amount, string cultureName) : base(amount, cultureName) {} public static new decimal GetCurrencyConversionRate(string isoCurrencySymbol) { // This would get the conversion rate from some web or database source decimal result = new Decimal(2); return result; } }

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  • Minimal assembler program for CP/M 3.1 (z80)

    - by Andrew J. Brehm
    I seem to be losing the battle against my stupidity. This site explains the system calls under various versions of CP/M. However, when I try to use call 2 (C_WRITE, console output), nothing much happens. I have the following code. ORG 100h LD E,'a' LD C,2 CALL 5 CALL 0 I recite this here from memory. If there are typos, rest assured they were not in the original since the file did compile and I had a COM file to start. I am thinking the lines mean the following: Make sure this gets loaded at address 100h (0h to FFh being the zero page). Load ASCII 'a' into E register for system call 2. Load integer 2 into C register for system call 2. Make system call (JMP to system call is at address 5 in zero page). End program (Exit command is at address 0 in zero page). The program starts and exits with no problems. If I remove the last command, it hangs the computer (which I guess is also expected and shows that CALL 0 works). However, it does not print the ASCII character. (But it does print an extra new line, but the system might have done that.) How can I get my CP/M program to do what the system call is supposed to do? What am I doing wrong?

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  • C# Excel Exception

    - by Andrew James Watt
    I am trying to copy all data from worksheet1 and paste the values into worksheet2 at the same position I am using office 2003 and the Interlop library. Here is my code; public void CreateExcelWorksheet() { Microsoft.Office.Interop.Excel.Application xlApp = new Microsoft.Office.Interop.Excel.Application(); if (xlApp == null) { Console.WriteLine("EXCEL could not be started. Check that your office installation."); return; } xlApp.Visible = true; Workbook wb = xlApp.Workbooks.OpenXML(@"C:\XML_Export.xml", Type.Missing, 2); Worksheet worksheet1 = wb.Worksheets[1] as Worksheet; Worksheet worksheet2 = wb.Worksheets[2] as Worksheet; worksheet1.UsedRange.Copy(Type.Missing); worksheet2.PasteSpecial(Microsoft.Office.Interop.Excel.XlPasteType.xlPasteValues, false, false, Type.Missing, Type.Missing, Type.Missing, Type.Missing); } For some reason after the paste command the following exception occurs: Exception from HRESULT: 0x800A03EC Could anyone help?

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  • Joining different models in Django

    - by Andrew Roberts
    Let's say I have this data model: class Workflow(models.Model): ... class Command(models.Model): workflow = models.ForeignKey(Workflow) ... class Job(models.Model): command = models.ForeignKey(Command) ... Suppose somewhere I want to loop through all the Workflow objects, and for each workflow I want to loop through its Commands, and for each Command I want to loop through each Job. Is there a way to structure this with a single query? That is, I'd like Workflow.objects.all() to join in its dependent models, so I get a collection that has dependent objects already cached, so workflows[0].command_set.get() doesn't produce an additional query. Is this possible?

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  • SQL Server schema-owner permissions

    - by Andrew Bullock
    if i do: CREATE SCHEMA [test] AUTHORIZATION [testuser] testuser doesn't seem to have any permissions on the schema, is this correct? I thought as the principal that owns the schema, you had full control over it? What permission do i need to grant testuser so that it has full control over the test schema only? Edit: by "full control" i mean the ability to CRUD tables, views, sprocs etc Thanks

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  • How to handle concurrency control in ASP.NET Dynamic Data?

    - by Andrew
    I've been quite impressed with dynamic data and how easy and quick it is to get a simple site up and running. I'm planning on using it for a simple internal HR admin site for registering people's skills/degrees/etc. I've been watching the intro videos at www.asp.net/dynamicdata and one thing they never mention is how to handle concurrency control. It seems that DD does not handle it right out of the box (unless there is some setting I haven't seen) as I manually generated a change conflict exception and the app failed without any user friendly message. Anybody know if DD handles it out of the box? Or do you have to somehow build it into the site?

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