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• Operating System Development

  - by j-t-s

  Hi All I'm looking for any website(s) devoted and/or related to Operating System Development, and would love for you to kindly share any links you may have. I have searched myself, but keep winding up at the same old sites, and am wondering if there are others that just don't get noticed by the major search engines or something. I've put this as a community wiki, simply because I don't think it's very fair to judge an answer based on a single link. Thank you.

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• Is there any open source/freeware TSO/ISP clone for PC?

  - by mawg

  Free as in beer. I can live without the source code. About 10 years ago I saw a commercial product. Is there anything free now? I found Gispf on SourceFOrge, but there are no downloads. Otherwise I Can't find a thing. Edit: I'd prefer something approaching the whole system, but could manage to live with the editor Edit" TSI is "the old Time-Sharing Option on IBM mainframes"

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• Is `std::string(strerror(errno))` dangerous?

  - by StackedCrooked

  At some places in my code, I print debug messages like this: int ret = getLinkSpeed(device.getSysName(), linkSpeed); if (ret < 0) { logDebug("Failed to obtain port speed for this device. Error: " + std::string(strerror(errno))); } From the documentation it is not entirely clear if strerror will return 0 under certain conditions (which would cause my code to crash). Does anyone know if it's safe?

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• What makes C faster than Python?

  - by Chris

  I know this is probably a very obvious answer and that I'm exposing myself to less-than-helpful snarky comments, but I don't know the answer so here goes. If Python compiles to bytecode at runtime, is it just that initial compiling step that takes longer? If that's the case wouldn't that just be a small upfront cost in the code (ie if the code is running over a long period of time, do the differences between C and python diminish?)

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• Parsing Huge XML Files in PHP

  - by Ian

  I'm trying to parse the dmoz content/structures xml files into mysql, but all existing scripts to do this are very old and don't work well. How can I go about opening a large (+1GB) xml file in php for parsing?

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• How do I check to see if a column is in an xsd?

  - by Timmy

  Is there a simple way to see if the xsd code generating C# code has a particular column? Or if you can reference a variable column? table.getColumn("column") instead of table.column?

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• How to open a PDF file?

  - by Alive

  I want to load a pdf file on the click of a button. In the OnClickButton() implementation I am writing the function which open the PDF file ShellExecute(0, "Open", "%s\\HELP\\RiverCADPro_User_Manual.pdf", NULL, NULL, SW_MAXIMIZE); The above code is not working.What else is to be needed so as to run the above code

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• Data type changing in Excel file Through c# Program

  - by Anilkumar

  I am generating an excel file through C# code. the cell Data type I'm giving as "" . Once I give Number instead of String The generated Excel could not open. How can I change the Datatype of the cell which I generated through the Code? Thanks in Advance.

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• How to redirect dynamic pages with htaccess

  - by user364577

  I have some old indexed pages like: index.php?action=addon_googlemap_showmap&listingID=XXXXX&popup=1 index.php?action=addon_googlemap_showmap&listingID=XXXXX&popup=yes and I want to redirect them to new urls: index.php?action=listingview&listingID=XXXXX XXXXX is a number. What should I put in my htaccess file? Thank you in advance.

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• Random Int in VB.Net

  - by brendan

  I need to generate random integer between 1-n (where n is a positive whole number) to use for a unit test. I don't need something overly complicated to ensure true randomnesses - just an old fashioned random number. How would I do that?

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• where does main() return its value?

  - by piemesons

  I'm newly using CODE::BLOCKS+mingw compiler If I don't type return 0 at the end of program,I can see that main() is returning some integer,I learnt that main() returning 0 infers program executes successfully.I don't find any flaw in my code, why is it returning some integer? secondly any function returns its value to its function call, to where does main() return its value?

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• memory leaks in Instruments

  - by jj

  I'm getting lots of leaks in my code, but none of the leaks point to any of my code (they are all UIKit methods). I'm running 3.0. Could someone tell me how I go about figuring out where these leaks are coming from?

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• Using bind( type, [data], fn ) and non-inline function

  - by dalizard

  $("p").bind("click", function(event){ // code goes here }); This is quite understandable. But what is the way to use a non-inline function and pass the event as an argument? That is: $("p").bind("click", myFunction(event)); function myFunction(event) { // code goes here } Thank you!

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• Integer array in Pythn

  - by Ra'ed

  how I can define array of integer numbers in Python code Say if this code is ok. or no pos = [int] len=99 for i in range (0,99): pos[i]=7

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• How to use #if directives in C#(3.0)

  - by Newbie

  I just found two piece of code #if CONSOLE // defined by the console version using ournamespace.FactoryInitializer; #endif and #if _NET_1_1 log4net.Config.DOMConfigurator.ConfigureAndWatch(new System.IO.FileInfo(s) ); #else log4net.Config.XmlConfigurator.ConfigureAndWatch(new System.IO.FileInfo(s) ); #endif Can any one please tell me with a running sample( please provide a simple one) what is the significance of those code snippets and when and how to use those? Thanks.

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• Set parameter to super view after dismissModalViewControllerAnimated

  - by user536926

  Hi, I have 2 view (view A and view B). In viewA when I touch a button I execute this code to flip a viewB: viewB.modalTransitionStyle = UIModalTransitionStyleFlipHorizontal; [self presentModalViewController:viewB animated:YES]; And now when I came back to viewA I use this code: [self dismissModalViewControllerAnimated: YES]; //here is my problem I need to set same parameters to viewA when I execute dismiss. How can I do it?

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• How do you implement the Decorator pattern if you can't inherit from the class you want to decorate?

  - by Lennie

  Hi, This is more a design question... You can't do a decorate design pattern if: 1) The object is marked "sealed" meaning you can't extend from it. 2) or you want to override a method but its not virtual. What can you do then? Taken that you can't change the class source code if you don't have the source code (like a 3rd party library).

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• How to start an Intent by passing some parameters to it?

  - by Pentium10

  I would like to pass some variables in the constructor of my ListActivity I start activity via this code: startActivity(new Intent (this, viewContacts.class)); I would like to use similar code, but to pass two strings to the constructor. How is possible?

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• How to compare the year with the current year in iphone?

  - by Warrior

  I am new to iphone development.I am parsing a XML URL and display the title ,date and summary in a table view.I noticed some of the date were very old like "Wed, 31 Dec 1969 19:00:00 -0500" ,So i don't want to display the dates which are 1 year older than the current year.How to do that? I used the sample code from this site for parsing and display the details.Please help me out.Thanks.

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• Using closes sql connection brought over by a function

  - by iefpw

  Would this using close this _connection? using(SqlConnection _connection = Class1.GetSqlConnection()) { //code inside the connection } //connection should be closed/ended? I'm just wondering because GetSqlConnection() is a static function of Class1 and the whole connection might not be closed because it is calling outside class' static function instead of straight? using(SqlConnection _connection = new SqlConnection(_connectionString) { //code inside the connection }

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• perl + want to put uniq char as @ without backslash "\"

  - by yael

  I need to know if there is some way to replace any string as @ or * or ? or & without to put the "\" before it Example perl -pe 'next if /^#/; s/\@d\&/new_value/ if /param5/' test in this example need to replace the @d& with new_value but I need to put the "\" before @ or & can be other way without to put the "\" because I have random char that can be in the old value.

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• Are there any scripts to synchronize sites?

  - by Matrym

  I've just set up a fail-over DNS to switch the site to a second host if the first is down. This is great for showing an old / archived version of the site, but I suspect maintenance is going to be a real pain. I moved the files over with rsync in the first place. Is this the kinda thing that could be run as a cron job, automatically moving over newer files?

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• Load HTML NSString into a UIWebView

  - by ehenrik

  Im doing a project where I connect to a webpage using the NSURLConnection to be able to monitor the status codes that are returned (200 OK / 404 ERROR). I would like to send the user to the top url www.domain.com if I recieve 404 as status code and if i recieve as 200 status code I would like to load the page in to a webview. I have seen several implementations of this problem by creating a new request but I feel that it is unnecessary since you already received the html in the first request so i would just like to load that HTML in to the webView. So i try to use the [webView loadHTMLFromString: baseURL:] but it doesn't always work, I have noticed that when i print the NSString with html in the connectionDidFinnishLoading it sometimes is null and when I monitor these cases by printing the html in didReceiveData a random number of the last packets is NULL (differs between 2-10). It is always the same webpages that doesn't get loaded. If I load them to my webView using [webView loadRequest:myRequest] it always works. My implementation looks like this perhaps someone of you can see what Im doing wrong. I create my first request with a button click. -(IBAction)buttonClick:(id)sender { NSURL *url = [NSURL URLWithString:@"http://www.domain.com/page2/apa.html"]; NSURLRequest *theRequest = [NSURLRequest requestWithURL:url] NSURLConnection *theConnection = [[NSURLConnection alloc] initWithRequest:theRequest delegate:self]; if( theConnection ) { webData = [[NSMutableData data] retain]; } else { } } Then I monitor the response code in the didReceiveResponse method by casting the request to a NSHTTPURLResponse to be able to access the status codes and then setting a Bool depending on the status code. -(void)connection:(NSURLConnection *)connection didReceiveResponse:(NSURLResponse *)response { NSHTTPURLResponse *ne = (NSHTTPURLResponse *)response; if ([ne statusCode] == 200){ ok = TRUE; } [webData setLength: 0]; } I then check the bools value in connectionDidFinnishLoading. If I log the html NSString I get the source of the webpage so i know that it isn't an empty string. -(void)connectionDidFinishLoading:(NSURLConnection *)connection { NSString *html = [[NSString alloc] initWithBytes: [webData mutableBytes] length:[webData length] encoding:NSUTF8StringEncoding]; NSURL *url = [NSURL URLWithString:@"http://www.domain.com/"]; if (ok){ [webView loadHTMLString:html baseURL:url]; ok = FALSE; } else{ //Create a new request to www.domain.com } } webData is an instance variable and I load it in didReceiveData like this. -(void)connection:(NSURLConnection *)connection didReceiveData:(NSData *)data { [webData appendData:data]; }

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• acts_as_list with has_and_belongs_to_many relationship

  - by mculp

  I've found an old plugin called acts_as_habtm_list - but it's for Rails 1.0.0. Is this functionality built in acts_as_list now? I can't seem to find any information on it. Basically, I have an artists_events table - no model. The relationship is handled through those two models specifying :has_and_belongs_to_many How can I specify order in this situation?

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• How to change/show permissiosns in C

  - by user304414

  Hi! I am new to C programming and I'd like to implement chmod command on files of a dir and subdir. How can I change/show permissiosns with a C code? Could someone help with a example? I would appreciate if anyone can provide me a code.

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