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  • .NET Garbage Collection behavior (with DataTable)

    - by gmac
    I am wonder why after creating a very simple DataTable and then setting it to null why Garbage Collection does not clear out all the memory used by that DataTable. Here is an example. The variable Before should be equal to Removed but it is not. { long Before = 0, After = 0, Removed = 0, Collected = 0; Before = GC.GetTotalMemory(true); DataTable dt = GetSomeDataTableFromSql(); After = GC.GetTotalMemory(true); dt = null; Removed = GC.GetTotalMemory(true); GC.Collect(); Collected = GC.GetTotalMemory(true); } Gives the following results. Before = 388116 After = 731248 Removed = 530176 Collected = 530176

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  • start intent without onCreate {}

    - by melvintcs
    i create a class extend Gallery and there is no onCreate, and i having a problem to run my intent. this is my sample code: this.setOnItemClickListener(new AdapterView.OnItemClickListener() { @Override public void onItemClick(AdapterView<?> parent, View v, int position, long id) { Intent intent = new Intent(v.getContext(), ClassName.class); startActivity(intent); }} i also tried below code to run, failed me also: Intent intent = new Intent(ThisClassName.this, ClassName.class); startActivity(intent); Please advice me what should i do :)

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  • Delphi Volume control by keyboard

    - by user568160
    Hi All, I recently had to replace a keyboard and this one ( GE 98552 ) does not have programmable buttons along the top and I miss the up/down volume buttons. it has 9 special buttons but none for volume and this model is not programmable. DUH! I am a long-time Delphi programmer but never messed with the multimedia stuff. Can anyone suggest some code to assign to say the "+" and "-" keys on the numeric pad that will change the volume up and down? I never use those two buttons so I would not be giving up functionality. Thanks Frank

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  • Parallel.For(): Update variable outside of loop

    - by TSS
    I'm just looking in to the new .NET 4.0 features. With that, I'm attempting a simple calculation using Parallel.For and a normal for(x;x;x) loop. However, I'm getting different results about 50% of the time. long sum = 0; Parallel.For(1, 10000, y => { sum += y; } ); Console.WriteLine(sum.ToString()); sum = 0; for (int y = 1; y < 10000; y++) { sum += y; } Console.WriteLine(sum.ToString()); My guess is that the threads are trying to update "sum" at the same time. Is there an obvious way around it?

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  • Problem decrementing in Java with '-='

    - by hanesjw
    I'm making a scrolling game on Android and am having a hard time figuring out why the code below does not decrement past 0. Objects start at the end of the screen (so the x position is equal to the width of the screen) the objects move accross the screen by decrementing their x positions. I want them to scroll off of the screen, but when the x position hits 0, the objects just stay at 0, they do not move into the negatives. Here is my code to move objects on the screen private void incrementPositions(long delta) { float incrementor = (delta / 1000F) * Globals.MAP_SECTION_SPEED; for(Map.Entry<Integer, HashMap<Integer, MapSection>> column : scrollingMap.entrySet()) { for(Map.Entry<Integer, MapSection> row : column.getValue().entrySet()) { MapSection section = row.getValue(); section.x -= incrementor; } } } It works ok if I change section.x -= incrementor; to section.x = section.x - (int)incrementor; but if i do that the scrolling doesn't appear as smooth.

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  • When open-sourcing a live Rails app, is it dangerous to leave the session key secret in source contr

    - by rspeicher
    I've got a Rails app that's been running live for some time, and I'm planning to open source it in the near future. I'm wondering how dangerous it is to leave the session key store secret in source control while the app is live. If it's dangerous, how do people usually handle this problem? I'd guess that it's easiest to just move the string to a text file that's ignored by the SCM, and read it in later. Just for clarity, I'm talking about this: # Your secret key for verifying cookie session data integrity. # If you change this key, all old sessions will become invalid! # Make sure the secret is at least 30 characters and all random, # no regular words or you'll be exposed to dictionary attacks. ActionController::Base.session = { :key => '_application_session', :secret => '(long, unique string)' } And while we're on the subject, is there anything else in a default Rails app that should be protected when open sourcing a live app?

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  • What is the purpose of AnyVal?

    - by DaoWen
    I can't think of any situation where the type AnyVal would be useful, especially with the addition of the Numeric type for abstracting over Int, Long, etc. Are there any actual use cases for AnyVal, or is it just an artifact that makes the type hierarchy a bit prettier? Just to clarify, I know what AnyVal is, I just can't think of any time that I would actually need it in Scala. When would I ever need a type that encompassed Int, Character and Double? It seems like it's just there to make the type hierarchy prettier (i.e. it looks nicer to have AnyVal and AnyRef as siblings rather than having Int, Character, etc. inherit directly from Any).

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  • xmlhttprequest vs jquery load();

    - by testkhan
    i am trying to making php ajax based chat system....and i have developed it successfully...i am using jquery load() with setInterval to reload chat every 1 second and it works fine on my localhost....but when i uploaded it on my hosting server it also works fine ... but problem is that after few mintues of chat the server takes to much long gets heavy loaded so that my server goes and and site goes down... my question is that, why it is happening so far...and what is the solution...should i use standard xmlhttprequest instead of load() or $.ajax() instead of load();

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  • XCode Project Code Changes Not Updating 100% After Save-Build-Run

    - by Greg
    When I make code changes to my iPhone game project in XCode, and then do CMD-B + Enter, I expect the project to be saved, build and run on the simulator with the latest. What is happening though, sometimes, is that it doesn't pick up a small change I make unless I clean the project and then build. I'm a long time Java person and newish to C-based languages and it's compiler. Can someone explain to me what is cached after each build that does this and how to change my project settings to avoid having to clean everytime? Or tell me the bad news that this is part of C development? Not trying to bash it - I get compiled JSPs stuck in the working cache often in Java, too. :P

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  • fastest way to perform string search in general and in python

    - by Rkz
    My task is to search for a string or a pattern in a list of documents that are very short (say 200 characters long). However, say there are 1 million documents of such time. What is the most efficient way to perform this search?. I was thinking of tokenizing each document and putting the words in hashtable with words as key and document number as value, there by creating a bag of words. Then perform the word search and retrieve the list of documents that contained this word. From what I can see is this operation will take O(n) operations. Is there any other way? may be without using hash-tables?. Also, is there a python library or third party package that can perform efficient searches?

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  • Capturing clicks even when stopPropagation has been called (ie by 3rd party code)?

    - by josh
    I want to detect any click that happens on a page (to close a custom context menu). I'm using jQuery and trying to do $(document).click(function(){ ...close my context menu ... }); However, I'm using some code that calls evt.stopPropagation() in the click handlers for certain elements on the page, and those clicks aren't making it up to my top-level handler. Is there any way of capturing those clicks? Can be jQuery or not jQuery, as long as it works cross-browser.

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  • what's wrong with my one-liner strncpy: while(*s++ = *t++ && n-- > 0);?

    - by pvd
    #include <stdio.h> #define STR_BUF 10000 #define STR_MATCH 7 void mystrncpy(char* s, char* t, int n) { while(*s++ = *t++ && n-- > 0); } int main() { int result; char str_s[STR_BUF] = "not so long test string"; char buf_1[STR_BUF]; mystrncpy(buf_1, str_s, STR_MATCH); printf ("buf_1 (mystrncpy, 7 chars): %s\n", buf_1); return 0; } When I run it, nothing happened ian@ubuntu:~/tmp$ gcc myncpy.c -o myn&&./myn buf_1 (mystrncpy, 7chars):

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  • Is this time related process accounting stats gathering appropriate?

    - by Ceko Cakata
    Based on sys/acct.h (V1, not V3) I need to gather some user usage statistics based on a parser that parser the acct file line by line. The parser will run and parse the entire file every N seconds and I need to gather user statistics accumulated since the last run (N seconds back). I'm not sure what will be the most appropriate way to do it based on the info provided by sys/acct.h. Maybe something like this: if ((ac_btime + ac_etime) < (current_time - N)) { gather; } Also comp_t is said to be "floating-point value consisting of a 3-bit, base-8 exponent, and a 13-bit mantissa", but I think u_int16_t is just a unsigned short int. Should I be converting it to long it with the provided formula or not?

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  • extended permissions

    - by melimoreno
    Hi i'm doing a fb app that update the status box(what's in your mind), i'm using set_status from facebooker .. first i have this error: set_status needs extended permission so i google it and find this: before_filter :ensure_has_status_update .. so i put it in my controller and that solves the problem, but when i try to update the status, all ways redirect me to a fb page that says: You have already granted permissions to this application. so i go to the controller comment before_filter :ensure_has_status_update and then go to my app again and it works.. so i want to do this if (has_status_update == false) ask for permision else update the status i google it for a long time but i can't find an answer..

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  • C# background worker while loop

    - by Mike
    What i'm trying to create is a background worker that executes a few processes every 30seconds. But I want this while loop to execute for as long as the program is launched. here is what I am using: private void watcherprocess1() { backgroundWorker1.RunWorkerAsync(); } private void backgroundWorker1_DoWork(object sender, DoWorkEventArgs e) { while( Thread.Sleep(30000); specficView2(); makeFormlist2(); populateListview2(); } My main issue is ai can think of a good while loop to keep this running

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  • Create ordering in a MySQL table without using a number (because then it's hard to put something in

    - by user347256
    I have a long list of items (say, a few million items) in a mysql table, let's call it mytable and it has the field mytable.itemid. The items are given an order, and can be re=ordered by the user by drag and drop. If I add a field called mytable.order and just put numbers in them, it creates problems: what if I want to move an item between 2 other items? Then all the order fields have to be updated? That seems like a nightmare. Is there a (scalable) way to add order to a table that is different from just giving every item a number, order by that, and do loads of SQL queries everytime the order is changed?

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  • What is this VB6 method doing?

    - by Craig
    We are converting a VB6 application to C# (4.0). and have come across a method in VB6 that we're battling to understand. Public Sub SaveToField(fldAttach As ADODB.Field) Dim bData() As Byte Dim nSize As Long nSize = Len(m_sEmail) bData = LngToByteArray(nSize) fldAttach.AppendChunk bData If nSize > 0 Then bData = StringToByteArray(m_sEmail) fldAttach.AppendChunk bData End If nSize = Len(m_sName) bData = LngToByteArray(nSize) fldAttach.AppendChunk bData If nSize > 0 Then bData = StringToByteArray(m_sName) fldAttach.AppendChunk bData End If bData = LngToByteArray(m_nContactID) fldAttach.AppendChunk bData End Sub It seems like it's doing some binary file copy type thing, but I'm not quite understanding. Could someone explain so that we can rewrite it?

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  • A Form(?) appears briefly outside of Form1 when adding a control to it

    - by ispiro
    I have a program which creates new Controls (actually - Form's with TopLevel = false) and puts them on a Panel which is on Form1. For some reason, this is usually followed by what seems like a Form appearing very briefly outside of Form1. It's hard to tell exactly what's happening because it's so brief. Perhaps it's Form1 moving there (and changing its size) and then returning. Or perhaps it's the Form that's being put on Form1 that appears there (though how could that happen at all? It's out of Form1!). I couldn't find anything in the code that might cause it, and the whole code is way too long to post here. (The relevant code is simply: MyPanel.Controls.Add(newForm);.) Is there any known bug that might cause this?

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  • Data Structure Brushup (Java)

    - by Daddy Warbox
    This should be easy for many of you, but for me it's just another bit of rust needing to be chipped away as I get back into basic Java coding. Using bloody associative arrays for so long in other languages have turned me nice and spoiled. :P My problem is simple: I'm storing a set of objects, each containing a string and a number, in a list. I would like each object inserted into this list to be sorted alphabetically by its string. I would also like to be able to retrieve objects from the list by their string as well. I would like to do this as formally and/or efficiently as possible. Is there something already available in the Java standard libraries for this?

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  • Slow loop in R, any suggestion to speed it up?

    - by cfceric
    I have a data frame "m" as shown below: I am trying to find each account's most active month (with most number of V1). for example for account "2", it will be "month 6", for account 3 it will be "month 1", .... I wrote the below loop, it works fine but just takes a long time even I only used 8000 rows, the whole data set has 250,000 rows, so the code below is not usable. Does any one can suggest a better way to achieve this? Thanks a lot.

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  • Organizing c# code into different files

    - by Adam S
    Hi everyone. I've gotten to a point where my main code file is about a thousand lines long and it's getting un-manageable; that is, I'm starting to get confused and not know where to locate some things. It's well-commented but there's just too much stuff. I'd really like to be able to organize my code into different files, each with its own purpose. I want to get all the help VS gives me as I type when I edit these other files. A picture can say a thousand words: Is what I'm trying to do even possible?

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  • Team activity/game for illustrating design in a SCRUM environment

    - by njreed.myopenid.com
    I'm looking for a team building / training activity for some of my scrum teams. I want something that really illustrates the flexibility that the team has when implementing stories to define the scope and complexity of the feature themselves. Most of the teams have long-term waterfall experience and are used to having a well-defined specification. I'm looking for something that illustrates the need for the team to vary the scope of what they are building themselves, dependent on the time and resources available. I couldn't find anything at tastycupcakes.com and Google wasn't much help. Maybe someone has prepared something themselves they would care to share?

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  • Parallel.For(): Different results for simple addition

    - by TSS
    I'm just looking in to the new .NET 4.0 features. With that, I'm attempting a simple calculation using Parallel.For and a normal for(x;x;x) loop. However, I'm getting different results about 50% of the time (no code change). long sum = 0; Parallel.For(1, 10000, y => { sum += y; }); Console.WriteLine(sum.ToString()); sum = 0; for (int y = 1; y < 10000; y++) { sum += y; } Console.WriteLine(sum.ToString()); Surely I'm missing something simple or do not completely understand the concept. My guess is that the threads are trying to update "sum" at the same time. If so, is there an obvious way around it?

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  • C# directory to "play with"

    - by Adam S
    Simple question here. I have a C# program which needs to stores some files onto the hard drive, but I don't need them to be anywhere useful to the end-user, only somewhere that the program can read/write from. Is there a directory that I can reference programmatically to be my "filespace playground" - that is, that I can read/write freely to and from? EDIT: Also, if I use a temp directory, how long are the files guaranteed to be there? I don't want the them to disappear while my program is still running!

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  • putting data from a for loop into a table using matlab and fprintf

    - by user2928537
    I am trying to put the following data from my for loop into a table formatted so that there are 11 values of F in each column, with a total of 4 columns. but I am always ending up with one long column of my data instead of the four columns I want. I was wondering if there is some way to put the data into a matrix and then reshape it, but I am having trouble. Any help greatly appreciated. fprintf ('Electrostatic Forces:\n') for r = 1:4; q2 = 0: 1*10^-19: 1*10^-18; for F = coulomb(q2,r); fprintf ('%d\n',F) end end Where the code for the function coulomb is function F = coulomb (q2,r); k = 8.98*10^9; q1 = 1.6*10^-19; F = k*abs(q1*q2)/r^2; end

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