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  • printing uid of a file on linux system

    - by neo730
    i am learning c programming. I am trying to make my own program similar to ls command but with less options.what i am doing is taking input directory/file name as argument and then gets all directory entry with dirent struct(if it is directory) . After it i use stat() to take all information of the file but here is my problem when i use write() to print these value its fine but when i want to print these with printf() i get warninng : format ‘%ld’ expects type ‘long int’, but argument 2 has type ‘__uid_t’. I don't know what should use at place of %ld and also for other special data types.

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  • Can a client determine whether the server has accept()'d a unix socket?

    - by Havoc P
    I'm dealing with a buggy server that will sometimes fail to accept() connections (but leaves its listening socket open). This is on Linux with unix domain sockets. Currently the only way to detect this is that after sending a bunch of data, the buffer fills up and blocks, and the server isn't sending any replies. This long-after-the-fact failure mode is hard to distinguish from other bugs - the server could be unresponsive for other reasons. Especially for unix domain sockets it seems the kernel should know whether accept() has occurred; is there any way to find this out? Can the client block until accept() happens somehow, or at least check whether it has? This is just for debugging purposes so it can be a little ugly.

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  • setting a cookie in php

    - by Jacksta
    I am trying to set a cookie, whas wrong with this as I am getting an error. Warning: setcookie() expects parameter 3 to be long, string given in /home/admin/domains/domain.com.au/public_html/setcookie.php on line 6 <?php $cookie_name = "test_cookie"; $cookie_value = "test_string"; $cookie_expire = "time()+86400"; $cookie_domain = "localhost"; setcookie($cookie_name, $cookis_value, $cookie_expire, "/", $cookie_domain, 0); ?> <HTM> <HEAD> </HEAD> <BODY> <h1>cookie mmmmmmm</h1> </BODY> </HTML>

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  • Is it possible to use re2 from Python?

    - by flow
    i just discovered http://code.google.com/p/re2, a promising library that uses a long-neglected way (Thompson NFA) to implement a regular expression engine that can be orders of magnitudes faster than the available engines of awk, Perl, or Python. so i downloaded the code and did the usual sudo make install thing. however, that action had seemingly done little more than adding /usr/local/include/re2/re2.h to my system. there seemed to be some `*.a file in addition, but then what is it with this *.a extension? i would like to use re2 from Python (preferrably Python 3.1) and was excited to see files like make_unicode_groups.py in the distro (maybe just used during the build process?). those however were not deployed on my machine. how can i use re2 from Python?

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  • How to file split at a line number

    - by superspace
    I want to split a 400k line long log file from a particular line number. For this question, lets make this an arbitrary number 300k. Is there a linux function that allows me to do this? I know split lets me split the file in equal parts either by size or line numbers but that's not what I want. I want to the first 300k in one file and the last 100k in the second file. Any help would be appreciated. Thanks!

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  • Are there any reasons for why you would include JavaScript using document.writeln

    - by David Johnstone
    Are there any good reasons for why you would include JavaScript like this: <script type="text/javascript">document.writeln('<script src="http://example.com/javascript/MyJavaScript.js" type="text/javascript"><' + '/script>');</script> (Sorry for the long scrolling line. This is in the head of a HTML document.) I've been looking at some HTML recently and I've noticed this a few times (all on the one site). I can't think of any reasons why you would do it like this, but I can hardly claim to be a web developer. It's likely that these lines of code are automatically generated, but still, someone somewhere must have thought this was a good idea.

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  • In MSSQL, how do I create a reference variable to a table?

    - by Jón Trausti
    Hello. I'm currently using sp_executesql to execute a T-SQL statement with a dynamic table name. However, it is really ugly to see something like: set sql = 'UPDATE '+Table_Name+' SET ... WHERE '+someVar+' = ... AND '+someVar2' = ...' sp_executesql sql What I would rather like to have is a TABLE variable of which is a reference to a table, so I could do for example: UPDATE TableRef SET ... WHERE ... Because when I have really long T-SQL statements it gets really hard to read due to the format of it within a string. Any suggestions would be helpful. Thanks!

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  • Problem with IE when using display:block for links

    - by Waleed Eissa
    This is my HTML: <div id="links"> <a href="">Link 1</a> <a href="">Link 2</a> <a href="">Link 3</a> <a href="">Link 4</a> </div> And these are the CSS styles: #links { position: absolute; border: 1px solid #000; } #links a { display: block; } #links a:hover { background-color: #CCC; } This displays a list of links, the problem is that in IE, I can only click a link by directly clicking the text link, which is not the case with other browsers (where you can click anywhere whether the text link or anywhere else as long as it's in the link block), is there any fix for that (with only CSS, no javascript)? Please note that I don't want to specify a width for the links or the div.

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  • Source code annotation tool

    - by RoToRa
    I'm looking for a tool with which I can annotate source code. I have some 3rd party source code (JavaScript) I need to understand and I don't want to change it (add inline comments) so that line numbers can stay intact (for communication with others), I can avoid accidentally changing something and my annotations stand out compared to the authors comments. Normally I would print the whole thing out an scribble on it, but the code is too long for that and I need to share it per email. I would be great if one could do some like that including being able to create "links" between so places in the code, possibly even visually with a lines or arrows.

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  • Return database messages on successful SQL execution when using ADO

    - by peacedog
    I'm working on a legacy VB6 app here at work, and it has been a long time since I've looked at VB6 or ADO. One thing the app does is to executes SQL Tasks and then to output the success/failure into an XML file. If there is an error it inserts the text the task node. What I have been asked to do is try and do the same with the other mundane messages that result from succesfully executed tasks, like (323 row(s) affected). There is no command object being used, it's just an ADODB.Connection object. Here is the gist of the code: Dim sqlStatement As String Set sqlStatement = /* sql for task */ Dim sqlConn As ADODB.Connection Set sqlConn = /* connection magic */ sqlConn.Execute sqlStatement, , adExecuteNoRecords What is the best way for me to capture the non-error messages so I can output them? Or is it even possible?

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  • How to scan a mixed mode C++/CLI assembly to create the intellisense XML?

    - by Anzurio
    We have a C++/CLI mixed mode assembly out of which we produce an XML file that we use for both, Sandcastle documentation and Intellisense. We use a tool which scans the assembly and create all entries for us, unfortunately I don't know how this tool works and it is unable to handle method signatures like: void foo([Out] long bar); The XML file is expected this parameter to be System.Int32!CompilerServices.IsLong@ but our tool just can't handle that. In other words, how do you scan an assembly to create the XML file needed for Intellisense?

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  • Why does Perl's Crypt::SSLeay timeout on Intel Mac OS X machines?

    - by Joe
    A have a Perl cron job that recently started having its HTTPS connections start failing with an error of "500 SSL read timeout". I've tracked that the error is being thrown as part of an alarm in Crypt::SSLeay, but I don't know if this is simply something taking too long to respond. So far, I've adjusted the timeout from the default 30 seconds to 10 minutes and it still times out. I've moved the script to other machines, and those on Intel Mac OS X systems all time out, while those under Linux, or on PPC Mac OS X systems run fine, so I don't think it's changes on the network or remote server. When the process started having problems does not coincide with any software updates or reboots on the machine, and I've contacted the server I'm connecting to, and everyone claims that they haven't changed anything. Does anyone have recommendations on trying to debug HTTPS, or have you ever seen this behavior and give recommendations on something I might've overlooked at that could've caused this problem?

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  • iPhone - dismiss multiple ViewControllers

    - by Oscar Peli
    Hi there, I have a long View Controllers hierarchy; in the first View Controller I use this code: SecondViewController *svc = [[SecondViewController alloc] initWithNibName:@"SecondViewController" bundle:nil]; [self presentModalViewController:svc animated:YES]; [svc release]; In the second View Controller I use this code: ThirdViewController *tvc = [[ThirdViewController alloc] initWithNibName:@"ThirdViewController" bundle:nil]; [self presentModalViewController:tvc animated:YES]; [tvc release]; and so on. So there is a moment when I have many View Controllers and I need to come back to the first View Controller. If I come back one step at once, I use in every View Controller this code: [self dismissModalViewControllerAnimated:YES]; If I want to go back directly from the, say, sixth View Controller to the first one, what I have to do to dismiss all the Controllers at once? Thanks

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  • Converting an equation into a way java script can interpret it

    - by GeorgeTaylor
    So I have this code that is meant to do this equation: (1 / 15) * arccos(-tan(L) * tan(23.44 * sin(360 * (D + 284) / 365))) and for testing purposes alert it! But for some reason it returns "NaN". I've probably done something really stupid :P var now = new Date(); var start = new Date(now.getFullYear(), 0, 0); var diff = now - start; var oneDay = 1000 * 60 * 60 * 24; var d = Math.floor(diff / oneDay); var lat = position.coords.latitude; var long = position.coords.longitude; var tanlat = Math.atan(lat); var tantwentythree = Math.tan(23.44); var dayplus = d + 284; var sinday = Math.sin(360 * dayplus); var arccos = Math.acos(tanlat); var start = 1 / 15; var equation = start * arccos * tantwentythree * sinday / 365; alert(equation);

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  • Using Google Weather API with Lat and Lon - how to format?

    - by Paul
    I am wanting to use the Google Weather API - by passing lat and long values. However it seems Google is needing these formatted differently to the values I have stored. i.e. For the town of McTavish I have values of 45.5 and -73.583 This works here: http://api.wunderground.com/auto/wui/geo/WXCurrentObXML/index.xml?query=45.5,-73.583 But when I use Google it does not: See: www.google.com/ig/api?weather=,,,45.5,-73.583 Any help appreciated. I would prefer to use the Google Data.

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  • Making form submissions unique using PHP and HTML

    - by canadiancreed
    Hello all I'm currently developing a page where the user fills out a form, and when submitted they are taken to the next page. When on the next page, I want to have it so that if the user went back to the previous page using the back button, or hit refresh, the submission will not be saved into the DB. Now I recall reading somewhere that if you had a way to make each submission unique, this issue is averted, but after screwing around for hours on end, for the life of me I cannot recall how this could be done (using PHP), so long story short has anyone ran into this, and if so, what was your solution?

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  • [Python] How can I speed up unpickling large objects if I have plenty of RAM?

    - by conradlee
    It's taking me up to an hour to read a 1-gigabyte NetworkX graph data structure using cPickle (its 1-GB when stored on disk as a binary pickle file). Note that the file quickly loads into memory. In other words, if I run: import cPickle as pickle f = open("bigNetworkXGraph.pickle","rb") binary_data = f.read() # This part doesn't take long graph = pickle.loads(binary_data) # This takes ages How can I speed this last operation up? Note that I have tried pickling the data both in using both binary protocols (1 and 2), and it doesn't seem to make much difference which protocol I use. Also note that although I am using the "loads" (meaning "load string") function above, it is loading binary data, not ascii-data. I have 128gb of RAM on the system I'm using, so I'm hoping that somebody will tell me how to increase some read buffer buried in the pickle implementation.

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  • Great computer-science speeches

    - by sub
    I've looked into some questions here where the "best" programming books are listed and then thought why there isn't a question concerning speeches yet. I think that speeches or presentations from developers or even creators of programming languages which were or are heavily used at some point are particulary interesting. One of my favorite speeches was recommended to me by someone here on SO: The future of C# I also like Guido van Rossum's speeches but he sometimes seems pretty nervous. Another in my opinion good presentation would be the Google tech talk about Go. Which (recorded) programming presentations/speeches are worth watching? edit: Made this a community wiki as the answer would probably be a pretty long list.

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  • Window Wrapper Class C++ (G++)

    - by Ell
    Hi all, I am attempting to learn about creating windows in c++, I have looked at an article about creating a wrapper class but I don't really understand it. So far I know that you can't have a class method WndProc (I dont know why) but honestly, that is all. Can somebody give an explanation, also explaining the reinterpret_cast? Here is the article. LRESULT CALLBACK Window::MsgRouter(HWND hwnd, UINT message, WPARAM wparam, LPARAM lparam) { Window *wnd = 0; if(message == WM_NCCREATE) { // retrieve Window instance from window creation data and associate wnd = reinterpret_cast<Window *>((LPCREATESTRUCT)lparam)->lpCreateParams; ::SetWindowLong(hwnd, GWL_USERDATA, reinterpret_cast<long>(wnd)); // save window handle wnd->SetHWND(hwnd); } else // retrieve associated Window instance wnd = reinterpret_cast<Window *>(::GetWindowLong(hwnd, GWL_USERDATA)); // call the windows message handler wnd->WndProc(message, wparam, lparam); } Thanks in advance, ell.

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  • Using Fortran to call C++ Functions

    - by Dane Larsen
    I'm trying to get some FORTRAN code to call a couple c++ functions that I wrote (c_tabs_ being one of them). Linking and everything works just fine, as long as I'm calling functions that don't belong to a class. My problem is that the functions I want the FORTRAN code to call belong to a class. I looked at the symbol table using nm and the function name is something ugly like this: 00000000 T _ZN9Interface7c_tabs_Ev FORTRAN won't allow me to call a function by that name, because of the underscore at the beginning, so I'm at a loss. The symbol for c_tabs when it's not in a class is quite simple, and FORTRAN has no problems with it: 00000030 T c_tabs_ Any suggestions? Thanks in advance.

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  • Incremement Page Hit Count in Django

    - by Andrew C
    I have a table with an IntegerField (hit_count), and when a page is visited (ie. http://site/page/3) I want record id 3 'hit_count' column in the database to increment by 1. The query should be like: update table set hit_count = hit_count + 1 where id=3 Can I do this with the standard Django Model conventions? Or should I just write the query by hand? I'm starting a new project, so I am trying to avoid hacks. We'll see how long this lasts! Thanks!

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  • MySQL triggers cannot update rows in same table the trigger is assigned to. Suggested workaround?

    - by Cory House
    MySQL doesn't currently support updating rows in the same table the trigger is assigned to since the call could become recursive. Does anyone have suggestions on a good workaround/alternative? Right now my plan is to call a stored procedure that performs the logic I really wanted in a trigger, but I'd love to hear how others have gotten around this limitation. Edit: A little more background as requested. I have a table that stores product attribute assignments. When a new parent product record is inserted, I'd like the trigger to perform a corresponding insert in the same table for each child record. This denormalization is necessary for performance. MySQL doesn't support this and throws: Can't update table 'mytable' in stored function/trigger because it is already used by statement which invoked this stored function/trigger. A long discussion on the issue on the MySQL forums basically lead to: Use a stored proc, which is what I went with for now. Thanks in advance!

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  • Copy constructor with more than one parameter

    - by Ravi Gupta
    I am learning C++ and was reading copy constructor from the C++: The Complete Reference. The books says that It is permissible for a copy constructor to have additional parameters as long as they have default arguments defined for them. However, in all cases the first parameter must be a reference to the object doing the initializing. But I am confused that how we are going to pass those additional parameters? I am sure there should be some way which is not given in the book and which I am unable to figure out. Can anyone help me out? EDIT: Also is it possible to pass these extra parameters in all three cases i.e. ¦ When one object explicitly initializes another, such as in a declaration ¦ When a copy of an object is made to be passed to a function ¦ When a temporary object is generated (most commonly, as a return value)

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  • c++ library for endian-aware reading of raw file stream metadata?

    - by Kache4
    I've got raw data streams from image files, like: vector<char> rawData(fileSize); ifstream inFile("image.jpg"); inFile.read(&rawData[0]); I want to parse the headers of different image formats for height and width. Is there a portable library that can can read ints, longs, shorts, etc. from the buffer/stream, converting for endianess as specified? I'd like to be able to do something like: short x = rawData.readLeShort(offset); or long y = rawData.readBeLong(offset) An even better option would be a lightweight & portable image metadata library (without the extra weight of an image manipulation library) that can work on raw image data. I've found that Exif libraries out there don't support png and gif.

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  • How to use startMethodTracing APIs on Android?

    - by Rajorshi
    I have recently started working on an app which has both Java and native components. I am trying to generate trace information for both components using Debug.startMethodTracing("myapp") and Debug.startNativeTracing() alternately. However, both are behaving unexpectedly. When I use Debug.startMethodTracing("myapp"), I can see a file /sdcard/myapp.trace being created but it is always empty no matter how long I run my app. When I use Debug.startNativeTracing() and start the emulator with the -trace <tracename> switch, I see a message saying "Trace started", but when I try to run my app, the emulator crashes. Am I missing something obvious here? How do I debug this problem?

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