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• deleting a file in java while uploading it in other thread

  - by user369507

  i'm trying to build a semi file sharing program, when each computer acts both as a server and as a client. I give multiple threads the option to DL the file from my system. also, i've got a user interface that can recieve a delete message. my problem is that i want that the minute a delete message receieved, i wait for all the threads that are DL the file to finish DL, and ONLY than excute file.delete(). what is the best way to do it? I thought about some database that holds and iterate and check if the thread is active, but it seems clumsy. is there a better way? thanks

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• Which destructor is called when in C++?

  - by BastiBechtold

  I am hunting memory leaks in a program. I narrowed it down to some destructors not being called. However, I can't figure out why: class CMain : public CList { public: CMain(); virtual ~CMain(); ... } class CList : public CProc { public: CList(); virtual ~CList(); ... } CMain gets deallocated just fine, but ~CList() is never called. All parent classes of CList have virtual destructors, too. Do you have any hints about why the destructor for CList is never called?

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• Staticly linked libraries not running code inside to setup static variables.

  - by MJD

  In a c++ project I am working on, I have a simple c++ file that needs to run some code at the beginning of the progam execution. This file is linked into a static library, which is then linked into the main program. I have similar code in other files running fine, that looks something like: bool ____nonexistant_value = executeAction(); However, it does not work inside this file unless I make use of a function implemented in this file. It does work if the library is compilied as a shared library. I'd prefer to link this statically as the library is only a convience as the file is in a different directory.

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• What is a Custom Class?

  - by John Saunders

  Many questions here on SO ask about custom classes. I, on the other hand, have no idea what they're talking about. "Custom class" seems to mean the same thing I mean when I say "class". What did I miss, back in the '80s, that keeps me from understanding? I know that it's possible to purchase a packaged system - for Accounting, ERP, or something like that. You can then customize it, or add "custom code" to make the package do things that are specific to your business. But that doesn't describe the process used in writing a .NET program. In this case, the entire purpose of the .NET Framework is to allow us to write our own code. There is nothing useful out of the box.

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• How to do visible EditText Data on Activity change

  - by user1249134

  HellO friends i am having edit text in my program and if i am writing some thing on there and if i am clciking on other option which will move to anothe activity and when i am coming back to same page the data of my edit text is clearing i dont want to clear data if i move on another page can any body tell me how to do it ..i am doing it by writing below code.. if(PresetQuestion.value=="true") { String note1=note.getText().toString(); note.setText(note1); } but its not woring i thing i am not doing correctly ...

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• A strange issue... No code changes getting reflected.

  - by sachin

  I am using netbeans to develop an applet, i have a piece of code which looked like this: ipAddresss = DEFAULT_IP; System.out.println("portlet.services.hostname:" + ipAddresss); Now I changed it to something like this: ipAddresss = DEFAULT_IP; System.out.println("portlet.services.hostname using default IP Address:" + ipAddresss); But no matter what I do, it sill keep on printing: portlet.services.hostname:null I have tried deleting all .netbeans folder from documents and settings, tried creating new project, but now i am completely baffled by this issue... So, the problem is, no matter what I do, no change is getting reflected when I run the program. Can there be a java applet cache, netbeans cache, i am not sure why...

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• Warning of "Control may reach end of non-void function"

  - by Cloud_cal

  I ran a C++ program in Xcode, and encountered a warning of "Control may reach end of non-void function". Here is the code: Node* search(Node* head, int x) { if(!head) return NULL; else if(x == head->key) return head; else if(x < head->key) search(head->lchild, x); else search(head->rchild, x); } I got the same warning when compiling it in Linux, but got the correct result. But in Xcode, the result was wrong. By the way, I got the correct answer and no warning in Visual Studio.

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• Force freeing memory in PHP

  - by DBa

  Hi everybody, in a PHP program, I sequentially read a bunch of files (with file_get_contents), gzdecode them, json_decode the result, analyze the contents, throw the most of it away, and store about 1% in an array. Unfortunately, with each iteration (I traverse over an array containing the filenames), there seems to be some memory lost (according to memory_get_peak_usage, about 2-10 MB each time). I have double- and triplechecked my code, I am not storing unneded data in the loop (and the needed data hardly exceeds about 10MB overall), but I am frequently rewriting (actually, strings in an array). Apparently, PHP does not free the memory correctly, thus using more and more RAM until it hits the limit. Is there any way to do a forced garbage collection? Or, at least, to find out where the memory is used? Thanks in advance, Dmitri

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• ruby confusing -- local variable or instance_method ?

  - by boblu

  I have the following program. module C def self.included(base) base.extend(ClassMethods) end module ClassMethods def test_for class_eval <<-DEFINECLASSMETHODS def self.my_method(param_a) puts "SELF is: #{self.inspect}" puts param_a puts "#{param_a}" end DEFINECLASSMETHODS end end end class A include C end class B < A test_for end when I run B.new.my_method("aaa"), I got this error NameError: undefined local variable or method `param_a' for B:Class I am quite confused. I define param_a as a local variable in class method my_method, puts param_a runs good, and will output the "aaa". however, puts "#{param_a}" output that error. why? Can anyone explain this?

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• partition from programming pearls

  - by davit-datuashvili

  hi suppose i have following array int a[]=new int[]{55,41,59,26,53,58,97,93}; i want to partition it around 55 so new array will be such } 41,26,53,55,59,58,93,93}; i have done such kinds of problems myself but this is from programming pearls and here code is like this we have some array[a..b] and given value t we write code following way int m=a-1; for i=[a..b] if ( array[i]<t) swap (++m;i); where swap function exchange two element in array at indexes ++m and i, i have run this program and it showed me mistake Exception java.lang.NullPointerException can anybody help me?

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• absolute expiration cache object - can it be manually removed ?

  - by Truegilly

  Hello, been pulling my hair out over this for the past few hours. i have a cache object.. HttpRuntime.Cache.Insert("Members", AllMembersList, null, DateTime.Now.AddHours(1), TimeSpan.Zero); when i try and clear the cache object.. HttpRuntime.Cache.Remove("Members"); its value doesnt change, untill 1 hour is up or when i reset the server. My question.. for a cache object that is set absolute expiration, can i manually clear it or will it exist for the full hour ? what i would like is this object to last for an hour but depending on program execution be able to clear it so it will contain fresh data. any help is most appreciated truegilly

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• A Computer Poem for those over 30 [closed]

  - by arvind

  I recd. a very good poem, that i wished to share with everyone. so for once we need no answers. lol ;-) A computer was something on TV From a science fiction show of note A window was something you hated to clean And ram was the cousin of a goat. Meg was the name of my girlfriend And gig was a job for the nights Now they all mean different things And that really mega bytes. An application was for employment A program was a TV show A cursor used profanity A keyboard was a piano.

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• how to display CFStringType? Like kABHomeLabel

  - by xiaozi

  I know that NSString and CFString are toll-bridge, they can convert in such a way. CFStringRef cfStr; NSString* anStr=(NSString*)cfStr; however,when I convert string in such a case when dealing addressbook NSString* homeLabel=(NSString*)kABWorkLabel; then homeLabel is "$!!$"; the other pre-defined CFStringRef in the addressbook property is the same. in my program,I want to get both the label and the label item's info. NSString* label=ABMultiValueCopyLabelAtIndex(multi,i); so how to correctly get the string of the label? Thanks!

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• Sending a Java object from my Android phone to my Computer

  - by TehGoose

  Hi, I was wondering what the simplest program for sending an object from my Andriod phone to my computer wirelessly (via LAN) would be. I have created Java RMI programs with a server and multiple clients, so I have a grasp of the concept. However with android I'm just not sure where to start. What I am aiming to do is send some sort of information (could simply be text) to my computer and my computer will do an action. I have the GUI interface's and the actions to be carried out all worked out, just the sending of some sort of information is getting me. Could anyone help me out?

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• Why does py2exe remove `help` and `license`?

  - by cool-RR

  I packaged my Python app with py2exe. My app is a wxPython GUI, in which there is an interactive Python shell. I noticed that I can't do help(whatever) in the shell. I investigated a bit and discovered that after the py2exe process, 3 items were missing from __builtin__. These are help, license, and another one I haven't discovered. Why is this happening and how can I stop it? I want the users of my program to be able to use the help function of Python.

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• Rails- MiniMagick commands not working

  - by digitalWestie

  I'm running windows xp and I've got MiniMagick and ImageMagick installed (latest versions). I'm now using the console to test out that everything works. Using the ms command prompt image magick works no problem. I'm testing this by using the identify command. Now, when I try to use MiniMagick from the console by entering image = MiniMagick::Image.new('image.jpg') It returns MiniMagickError, "ImageMagick command ("identify \"input.jpg\"") failed: {:status_code = #"'identify' is not recognized as an internal or external command,\noperable program or batch file.\n"} Can anybody help?

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• Passing a multi-line string as an argument to a script in Windows

  - by Zack Mulgrew

  I have a simple python script like so: import sys lines = sys.argv[1] for line in lines.splitlines(): print line I want to call it from the command line (or a .bat file) but the first argument may (and probably will) be a string with multiple lines in it. How does one do this? Of course, this works: import sys lines = """This is a string It has multiple lines there are three total""" for line in lines.splitlines(): print line But I need to be able to process an argument line-by-line. EDIT: This is probably more of a Windows command-line problem than a Python problem. EDIT 2: Thanks for all of the good suggestions. It doesn't look like it's possible. I can't use another shell because I'm actually trying to invoke the script from another program which seems to use the Windows command-line behind the scenes.

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• Fatal error: Call to undefined function mysqli_connect()

  - by Jack

  I have installed WAMP. I am using Tomcat 6 to run my PHP scripts. I am also using JavaBridge.war and I have copied my php scripts into \webapp\JavaBridge\project. I have removed the semicolon from php.ini file before the statements extension=php_mysqli.dll extension=php_mysql.dll I have added C:\wamp\bin into my PATH env variable. I have copied all dll's from C:\wamp\bin\php\php5.3.0\ext into C:\windows\system32 I am still getting this error. Fatal error: Call to undefined function mysqli_connect() in C:\Program Files\apache-tomcat-6.0.26\webapps\JavaBridge\project\pf_query.php on line 534 Note - I dont get this error when I run my PHP script from Apache 2.2.11 of the WAMP package.

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• Android/Java Javadoc missing after updating Android SDK

  - by binnyb

  After i recently installed the new Android SDK stuff, I no longer can view the Javadoc while editing my project's code. I get this message: Note: This element has no attached source and the Javadoc could not be found in the attached Javadoc. I am getting this message for all methods, variables, classes, etc. I have installed the documentation and everything available to me via the android update manager. I have also tried to do a clean install of the android sdk and eclipse, and no luck getting the javadoc working. I have also tried manually setting the javadoc via project properties -> javadoc location -> file:/C:/Program Files/Android/android-sdk-windows/docs/reference/ with no luck What suggestions do you have that could fix this problem?

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• How do you pass an enum by reference?

  - by Darkenor

  I have an enum with four keys I'm taking as input for an interface program and I'd like to pass the enum by value to the interface function, which has become quite long. The enum is like this: enum MYKEYS { W, S, O, L }; There's also a boolean array that I have to pass by reference, which is also a little tricky. bool key[4] = { false, false, false, false }; Does anyone know the proper syntax to pass both of these as reference in a function, similar to: function(int & anintreference);

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• ExtJS (4.0) dynamic / lazy loading

  - by Paul

  Given a border layout with a west (navigation) and a center region. Let say I click on topic A in the west region, I want to replace (replace as in 'delete last topic') the center region with 'extjs' program code named topic_a.js I succeed in loading with this code: dynamicPanel = new Ext.Component({ loader: { url: '/www/file.htm', renderer: 'html', autoLoad: true, scripts: true } }); var oMainContainer = Ext.getCmp('maincontainer'); oMainContainer.show(); oMainContainer.add(dynamicPanel); But calling this the second time 'adds' things up in the center region and of course fails short in 'deleting', what would be a good approach?

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• How can I load an MP3 or similar music file for display and anaysis in wxWdigets?

  - by Jon Cage

  I'm developing a GUI in wxPython which allows a user to generate sequences of colours for some toys I'm building. Part of the program needs to load an MP3 (and potentially other formats further down the line) and display it to the user. That shuold be sufficient to get started but later I'd like to add features like identifying beats and some crude frequency analysis. Is there any simple way of loading / understanding an MP3's contents to display a plot of it's amplitudes to the screen using wxWidgets? I later intend to port to C++/wxWidgets for speed and to avoid having to distribute wxPython.

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• dreferencing 2 d array

  - by ashish-sangwan

  Please look at this peice of code :- #include<stdio.h> int main() { int arr[2][2]={1,2,3,4}; printf("%d %u %u",**arr,*arr,arr); return 0; } When i compiled and executed this program i got same value for arr and *arr which is the starting address of the 2 d array. For example:- 1 3214506 3214506 My question is why does dereferencing arr ( *arr ) does not print the value stored at the address contained in arr ?

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• How can I convert this string to list of lists?

  - by Phrixus

  Hi, what I'm trying to do is.. if a user types in [[0,0,0], [0,0,1], [1,1,0]] and press enter, the program should convert this string to several lists; one list holding [0][0][0], other for [0][0][1], and the last list for [1][1][0] I thought tuple thing would work out but no luck... :( I started phython yesterday -- (I'm C / C++ guy.) and cannot use the full advantages of this language... Does python have a good way to handle this? I need help~ :'(

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• swf doesn't respond on tomcat

  - by ron

  Hi, I made a war file out of my flex program (includes swf html etc.). I put the war in the tomcat root library (tomcat 6.0.26) I can see that the war was deployed, and i can get to it using http://localhost:8080/dir/myApp.html and see my swf. When i click directly on myApp.html i can see my swf main picture and its buttons in it. But, when i click a button which just popup a message, it doesn't work! On the other hand, When running the mainApp.html from my local drive it works fine. any help?

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