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  • Basic concepts in file system implementation

    - by darkie15
    I am a unclear about file system implementation. Specifically (Operating Systems - Tannenbaum (Edition 3), Page 275) states "The first word of each block is used as a pointer to the next one. The rest of block is data". Can anyone please explain to me the hierarchy of the division here? Like, each disk partition contains blocks, blocks contain words, and so on...

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  • Rails Scaffold problem # undefined method `edit_pais_path'

    - by Bruno Cordeiro
    I created a scaffold of named pais (This is a word in Portuguese of Brazil and is the same that country), i created using the follow command: ruby script\generate scaffold pais name:string abreviattion:string First I changed the inflections to my local idiom, like that: inflect.plural /^([a-zA-z]*)s$/i, '\1ses' #The plural of Pais is Paises And when I tryied to open the page on http://localhost:3000/paises I'm receiving the follow error: undefined method `edit_pais_path' for #<ActionView::Base:0x387fdf4> Thanks in advance.

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  • design for a wrapper around command-line utilities

    - by hatchetman82
    im trying to come up with a design for a wrapper for use when invoking command line utilities in java. the trouble with runtime.exec() is that you need to keep reading from the process' out and err streams or it hangs when it fills its buffers. this has led me to the following design: public class CommandLineInterface { private final Thread stdOutThread; private final Thread stdErrThread; private final OutputStreamWriter stdin; private final History history; public CommandLineInterface(String command) throws IOException { this.history = new History(); this.history.addEntry(new HistoryEntry(EntryTypeEnum.INPUT, command)); Process process = Runtime.getRuntime().exec(command); stdin = new OutputStreamWriter(process.getOutputStream()); stdOutThread = new Thread(new Leech(process.getInputStream(), history, EntryTypeEnum.OUTPUT)); stdOutThread.setDaemon(true); stdOutThread.start(); stdErrThread = new Thread(new Leech(process.getErrorStream(), history, EntryTypeEnum.ERROR)); stdErrThread.setDaemon(true); stdErrThread.start(); } public void write(String input) throws IOException { this.history.addEntry(new HistoryEntry(EntryTypeEnum.INPUT, input)); stdin.write(input); stdin.write("\n"); stdin.flush(); } } public class Leech implements Runnable{ private final InputStream stream; private final History history; private final EntryTypeEnum type; private volatile boolean alive = true; public Leech(InputStream stream, History history, EntryTypeEnum type) { this.stream = stream; this.history = history; this.type = type; } public void run() { BufferedReader reader = new BufferedReader(new InputStreamReader(stream)); String line; try { while(alive) { line = reader.readLine(); if (line==null) break; history.addEntry(new HistoryEntry(type, line)); } } catch (Exception e) { e.printStackTrace(); } } } my issue is with the Leech class (used to "leech" the process' out and err streams and feed them into history - which acts like a log file) - on the one hand reading whole lines is nice and easy (and what im currently doing), but it means i miss the last line (usually the prompt line). i only see the prompt line when executing the next command (because there's no line break until that point). on the other hand, if i read characters myself, how can i tell when the process is "done" ? (either complete or waiting for input) has anyone tried something like waiting 100 millis since the last output from the process and declaring it "done" ? any better ideas on how i can implement a nice wrapper around things like runtime.exec("cmd.exe") ?

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  • MySQL - Fulltext Index Search Issue

    - by RC
    Hi all, Two rows in the my database have the following data: brand | product | style ================================================= Doc Martens | Doc Martens 1460 Boots | NULL NewBalance | New Balance WR1062 SG Width | NULL Mininum word length is set to 3, and a FULLTEXT index is created across all the three columns above. When I run a search for IS BOOLEAN matches for +doc in the index, I get the first row returned as a result. When I search for +new, I get no results. Can someone explain why? Thanks.

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  • VB.net Regex Get Information

    - by xzerox
    Well I am currently trying to get the word/text in between these 2 things : and ! I tried this Dim nick As String = String.Empty Dim p = ":(?<ircnick>.*?)!" Dim Matches = Regex.Matches(mail, p, RegexOptions.IgnoreCase Or RegexOptions.Singleline) If Matches IsNot Nothing AndAlso Matches.Count > 0 Then For Each Match As Match In Matches If Match.Groups("info").Success Then nick = (Match.Groups("ircnick").Value) End If Next End If It doesn't display anything. If you guys can fix this code for me I would be happy :D.

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  • boost::bind breaks strict-aliasing rules?

    - by Kyle
    Using Boost 1.43 and GCC 4.4.3, the following code boost::bind(&SomeObject::memberFunc, this, _1)); Generates the following warning boost/function/function_base.hpp:321: warning: dereferencing type-punned pointer will break strict-aliasing rules What's the correct way to eliminate these warnings without setting -fno-strict-aliasing?

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  • Why do switch statements continue after case

    - by John W.
    After evaluating a case in a switch statement in Java (and I am sure other languages) the following case's are also evaluated unless a control statement like break, or return is used. I understand this is probably an implementation detail, but what is/are the reasons for having this functionality happen? Thanks!

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  • How to make an application like google transliteration desktop application in c#

    - by Thunder
    I would like to make a application that accepts the entry from keyboard modify it and send it to the active window (may be application like word, excel,notepad windows screens ) etc. It the feature is just like google's transliteration application for windows . I would like to do it in c# . I think this involves hooking in the keyboard and sending keys (like sendkey in vb) to the current window.

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  • Java - is it possible to read a file line by line, stop, and then immediately start reading bytes wh

    - by hatorade
    I'm having an issue trying to parse the ascii part of a file, and once I hit the end tag, IMMEDIATELY start reading in the bytes from that point on. Everything I know in Java to read off a line or a whole word creates a buffer, which ruins any chance of getting the bytes immediately following my stop point. Is the only way to do this read in byte-by-byte, find new-lines, reconstruct everything prior to the new-line, see if it's my end tag, and go from there?

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  • Regexp match in Java

    - by tinti
    Regexp in Java I want to make a regexp who do this verify if a word is like [0-9A-Za-z][._-'][0-9A-Za-z] example for valid words A21a_c32 daA.da2 das'2 dsada ASDA 12SA89 non valid words dsa#da2 34$ Thanks

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  • PHP Find and replace after in a string?

    - by TheBlackBenzKid
    I have some strings which contain the words LIMIT 3, 199 or LIMIT 0, 100. Basically I want to replace the word LIMIT and everything after it in my string. How do I do this in PHP? str_replace only replaces an item and the LIMIT text after is dynamic/ So it could be WHEN JOHN WAS TRYING HIS SQL QUERY, HE FOUND THAT LIMIT, 121 // RETURN WOULD BE WHEN JOHN WAS TRYING HIS SQL QUERY, HE FOUND THAT WHEN JOHN TRIED LIMIT 343, 333 HE FOUND // RETURN WOULD BE WHEN JOHN TRIED

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  • Finding the nth number of primes

    - by Braxton Smith
    I can not figure out why this won't work. Please help me from math import sqrt pN = 0 numPrimes = 0 num = 1 def checkPrime(x): '''Check\'s whether a number is a prime or not''' prime = True if(x==2): prime = True elif(x%2==0): prime=False else: root=int(sqrt(x)) for i in range(3,root,2): if(x%i==0): prime=False break return prime n = int(input("Find n number of primes. N being:")) while( numPrimes != n ): if( checkPrime( num ) == True ): numPrimes += 1 pN = num print("{0}: {1}".format(numPrimes,pN)) num += 1 print("Prime {0} is: {1}".format(n,pN))

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  • Why does my C++ LinkedList cause a EXC_BAD_ACCESS?

    - by Anthony Glyadchenko
    When I call the cmremoveNode method in my LinkedList from outside code, I get an EXC_BAD_ACCESS. /* * LinkedList.h * Lab 6 * * Created by Anthony Glyadchenko on 3/22/10. * Copyright 2010 __MyCompanyName__. All rights reserved. * */ #include <stdio.h> #include <iostream> #include <fstream> #include <iomanip> using namespace std; class ctNode { friend class ctlinkList ; // friend class allowed to access private data private: string sfileWord ; // used to allocate and store input word int iwordCnt ; // number of word occurrances ctNode* ctpnext ; // point of Type Node, points to next link list element }; class ctlinkList { private: ctNode* ctphead ; // initialized by constructor public: ctlinkList () { ctphead = NULL ; } ctNode* gethead () { return ctphead ; } string cminsertNode (string svalue) { ctNode* ctptmpHead = ctphead ; if ( ctphead == NULL ) { // allocate new and set head ctptmpHead = ctphead = new ctNode ; ctphead -> ctpnext = NULL ; ctphead -> sfileWord = svalue ; } else { //find last ctnode do { if ( ctptmpHead -> ctpnext != NULL ) ctptmpHead = ctptmpHead -> ctpnext ; } while ( ctptmpHead -> ctpnext != NULL ) ; // fall thru found last node ctptmpHead -> ctpnext = new ctNode ; ctptmpHead = ctptmpHead -> ctpnext ; ctptmpHead -> ctpnext = NULL ; ctptmpHead -> sfileWord = svalue ; } return ctptmpHead -> sfileWord ; } string cmreturnNode (string svalue) { return NULL; } string cmremoveNode (string svalue) { if (ctphead == NULL) return NULL; ctNode *tmpHead = ctphead; while (tmpHead->sfileWord != svalue || tmpHead->ctpnext != NULL){ tmpHead = tmpHead->ctpnext; } if (tmpHead == NULL){ return NULL; } else { while (tmpHead != NULL){ tmpHead = tmpHead->ctpnext; } } return tmpHead->sfileWord; } string cmlistList () { string tempList; ctNode *tmpHead = ctphead; if (ctphead == NULL){ return NULL; } else{ while (tmpHead != NULL){ cout << tmpHead->sfileWord << " "; tempList += tmpHead->sfileWord; tmpHead = tmpHead -> ctpnext; } } return tempList; } }; Why is this happening?

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  • Stop Search param in directories by grep immediately after param match

    - by yael
    hi friends I use the following command to find under /var some param in my script grep -R "param" /var/* 2/dev/null |grep -wq "param" my problem is that: after grep find the param in file grep continue to search until all searches under /var/* will completed How to perform stop immediately after grep match the param word For example when I run the: grep -R "param" /var/* 2/dev/null |grep -wq "param" grep find the param after one second. But grep continue to sears other same param and its take almost 30 seconds How to stop the grep immediately after param match? THX

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  • grep + add time out after some time if not find the relevant match

    - by yael
    Dear friends I use the following command syntax to search params in my script grep -qsRw -m1 "any_param" /dir/..../ Some times the search take avery long time The question is how to add time out to grep command For example after 20 seconds grep will break out If it not illegal to add time out to grep , how it will possible on other way? THX Yael

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  • get a button font api

    - by user545142
    hi first sorry for my English i try to get a word under mouse now my problem how to get the font of button i try to use IntPtr dc= GetDC(button1.Handle); IntPtr last_font = SelectObject(dc, Font.ToHfont()); Font fon = Font.FromHdc(dc); but it gave me the font of the form and some time gave me error Only TrueType fonts are supported. This is not a TrueType font any body help me

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  • It's possible make an OCR in Python to check words...

    - by Shady
    in opened applications? I want to automate firefox in some web page and I don't have a way to "know" if the page already load completely or if it still loading... I was thinking about making an OCR to check the status bar... it's difficult ? For example, when the word DONE appears at the status bar, the program continues to the next command...

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