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  • Distinguishing between failure and end of file in read loop

    - by celtschk
    The idiomatic loop to read from an istream is while (thestream >> value) { // do something with value } Now this loop has one problem: It will not distinguish if the loop terminated due to end of file, or due to an error. For example, take the following test program: #include <iostream> #include <sstream> void readbools(std::istream& is) { bool b; while (is >> b) { std::cout << (b ? "T" : "F"); } std::cout << " - " << is.good() << is.eof() << is.fail() << is.bad() << "\n"; } void testread(std::string s) { std::istringstream is(s); is >> std::boolalpha; readbools(is); } int main() { testread("true false"); testread("true false tr"); } The first call to testread contains two valid bools, and therefore is not an error. The second call ends with a third, incomplete bool, and therefore is an error. Nevertheless, the behaviour of both is the same. In the first case, reading the boolean value fails because there is none, while in the second case it fails because it is incomplete, and in both cases EOF is hit. Indeed, the program above outputs twice the same line: TF - 0110 TF - 0110 To solve this problem, I thought of the following solution: while (thestream >> std::ws && !thestream.eof() && thestream >> value) { // do something with value } The idea is to detect regular EOF before actually trying to extract the value. Because there might be whitespace at the end of the file (which would not be an error, but cause read of the last item to not hit EOF), I first discard any whitespace (which cannot fail) and then test for EOF. Only if I'm not at the end of file, I try to read the value. For my example program, it indeed seems to work, and I get TF - 0100 TF - 0110 So in the first case (correct input), fail() returns false. Now my question: Is this solution guaranteed to work, or was I just (un-)lucky that it happened to give the desired result? Also: Is there a simpler (or, if my solution is wrong, a correct) way to get the desired result?

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  • Is it possible to generate end comments for html

    - by Gandalf StormCrow
    Is it possible to generate comments for closing div tags, lets take this ex. into consideration normal HTML: <div id="content"> ... ...buch of html or whateve </div> with comments : <div id="content"> ... ...buch of html or whateve </div><!--End of content--> and so on go trough each div element and comment the end of it ?

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  • NSPredicate always gives back the same data

    - by Stef Geelen
    I am trying to work with NSPredicates. But it always give me back the same array. Here you can see my predicate. NSFetchRequest *request = [[NSFetchRequest alloc] init]; NSPredicate *predicate = [NSPredicate predicateWithFormat:@"whichAlbum.album_id == %d", AlbumId]; [request setEntity:[NSEntityDescription entityForName:@"Picture" inManagedObjectContext:self.genkDatabase.managedObjectContext]]; [request setPredicate:predicate]; Also when I try it hardcoded. It gives back the same array. NSPredicate *predicate = [NSPredicate predicateWithFormat:@"whichAlbum.album_id == 5"]; Here you can see my database model. And here you can see how I put data in my database for entity Picture. + (Picture *)pictureWithGenkInfo:(NSDictionary *)genkInfo inManagedObjectContext:(NSManagedObjectContext *)context withAlbumId:(int)albumId withPictureId:(int)pictureId; { Picture *picture = nil; picture = [NSEntityDescription insertNewObjectForEntityForName:@"Picture" inManagedObjectContext:context]; picture.url = [genkInfo objectForKey:PICTURES_URL]; picture.pic_album_id = [NSNumber numberWithInt:albumId]; picture.picture_id = [NSNumber numberWithInt:pictureId]; return picture; } Anybody can help me ? Kind regards

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  • i want to move div back left

    - by user1280074
    i have my BG image set to center & i wanna move my main content's div back to the left a little on that BG image. changing the width of the div wont do it. that just allows me to scroll more to the right. but i need it to move back left a little. but i still need that image center. how do i code this? bada-bing <style> body { background-image:url; background-repeat:no-repeat; background-position:center top; } </style> bada-boom <center> <div style="position: relative; left: 0px; top: 0px; width: 1200px; height: 1511px;"> <img src=""position: relative; top: 100px; left: -350px;"/> </div> </center> help me please

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  • Replacing the end of the line by SED in makefile

    - by Masi
    How can you append to the end of a line by SED controlled by makefile? I run paste -d" " t.tex tE.tex | sed 's@$@XXX@' > tM.tex where the problem is in the use of the mark $ for the end of the line. I get #paste -d" " t.tex tE.tex | sed -e s/" "/\\\&/g | sed -r "s/XXX/" > tM.tex sed: -e expression #1, char 10: unterminated `s' command make: *** [all] Error 1 I have the command just after the "all:" tag in my makefile which contains only the two lines. The parameters -n and -e do not help here. The command works as expected run when it is run directly in terminal.

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  • how to back to the first of text file

    - by Naeim
    i have a txt file which have some lines ...and my code is : string line; ifstream myfile("c:\\main.txt"); bool passport = true; while(passport==true){ int pos1=0; cout<<setw(20)<<"PassPort_Number : "; cin>>add.Id ; if (myfile.is_open()) { while(!myfile.eof()){ getline(myfile,line); pos1+=line.find(add.Id); cout<<pos1; }} if(pos1<0) passport=false; else { cout<<"PassPort Number tekrariye :d"<<endl; } } first time everything is ok but at the second time of running it doesn't enter to second while (while(!myfile.eof() ) ... what's wrong with my code? when it goes to the end of text file it doesn't back to the first of file at the next loop ... how can i back to the first of text file ?

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  • SQL - Break a start/end time into 15 minute records

    - by Chu
    I've got a record set that consists of a start and end time in two separate fields: id - Int startTime - DateTime endTime - DateTime I'd like to find a way to query a record and return it as X records based on the number of 15 minute intervals found between the start and end times. For example, let's say I have a record like this: id, StartTime, EndTime 1, 1/1/2010 8:28 AM, 1/1/2010 8:47 AM I would return 3 records, the first would represent the 8:15 interval, #2 for the 8:30 interval and then a 3rd for the 8:45 interval. I realize this could be done using logic in an sproc, but we are trying to remain db neutral as we support multiple database engines.

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  • Picking a front-end UI framework

    - by user457724
    Hi folks, We're working to build the front-end of our application and struggling with selecting a good UI framework since we're not experienced UI people (we're mainly back-end developers). The central issue is that we don't know what we don't know and don't know how to best weigh our different options. At the moment, we're evaluating Flex, ExtJS, and Vaadin. Is there another option we should consider? What, are the major elements we should evalutate on? Any insight would be helpful. Thanks, Alex

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  • WAVEFORMATEX - how to read codecdata at the end??

    - by Roey
    Hi All. I've a WAVEFORMATEX struct with some codecdata at the end of it (10 bytes). I'm using C++. How do I access the data at the end? (this is a purely technical question). I tried : WAVEFORMATEX* wav = (WAVEFORMATEX*)pmt->pbFormat; WORD me = wav->cbSize; wav = wav + sizeof(WAVEFORMATEX); BYTE* arr = new BYTE[me]; memcpy(arr, (BYTE*)wav, me); Didnt work. Thanks Roey

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  • redirecting back to php file

    - by tooepic
    hello again, following code is my php file that will list the people in my text file. <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd"> <html xmlns="http://www.w3.org/1999/xhtml"> <head> <title>viewlist php</title> </head> <body> <h1>List</h1> <?php $file = file("peoplelist.txt"); for($i=0; $i<count($file); $i++) { $person = explode(",", $file[$i]); echo "<hr />"; echo "<table cellspacing=10><tr><td>", $i+1,".", "</td>"; echo "<td>", $person[0], "<br />"; echo $person[1], "</td></tr></table>"; } ?> <hr /> <p> <a href="sortatoz.php" target="_self">Sort A-Z</a><br /> <a href="sortztoa.php" target="_self">Sort Z-A</a><br /> </p> </body> </html> what i want to do is, when i click Sort A-Z link, the file called sortatoz.php will sort the list in my text file and redirect back to viewlist.php with the list in sort order. below is my sortatoz.php: <?php header("Location: http://myserver/workspace/viewlist.php"); ?> <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd"> <html xmlns="http://www.w3.org/1999/xhtml"> <head> <title>sort a to z</title> </head> <h1>List</h1> <body> <?php $file = file("peoplelist.txt"); sort($file); for($i=0; $i<count($file); $i++) { $person = explode(",", $file[$i]); echo "<hr />"; echo "<table cellspacing=10><tr><td>", $i+1,".", "</td>"; echo "<td>", $person[0], "<br />"; echo $person[1], "</td></tr></table>"; } ?> <hr /> <p> <a href="sortvisitorsascending.php" target="_self">Sort Visitors A-Z</a><br /> <a href="sortvisitorsdescending.php" target="_self">Sort Visitors Z-A</a><br /> </p> </body> </html> now, when i click Sort A-Z link, it redirects back to viewlist.php...so I'm assuming the header() function is doing it's job. but the problem is...it's not sorting. i am very new with this, so bear with me and give me some guidance please. what can i do to my codes to redirect back viewlist.php with sorted list? thanks in advance.

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  • Javascript to convert Markdown/Textile to HTML (and, ideally, back to Markdown/Textile)

    - by Horace Loeb
    There are several good Javascript editors for Markdown / Textile (e.g.: http://attacklab.net/showdown/, the one I'm using right now), but all I need is a Javascript function that converts a string from Markdown / Textile - HTML and back. What's the best way to do this? (Ideally it would be jQuery-friendly -- e.g., $("#editor").markdown_to_html()) Edit: Another way to put it is that I'm looking for a Javascript implementation of Rails' textilize() and markdown() text helpers

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  • ASP wizard browser back button

    - by dzajdol
    Hi. I used asp wizard with updatepanel and google map (it works great). Wizard has 3 steps - all work's great, but when i click browser back button steps changed and i lose all previous information. When i click wizard previouse button - i can see my information. i try this: http://dotnetslackers.com/articles/ajax/HandlingTheBackButtonFromServerCode.aspx but ScriptManager1.IsInAsyncPostBack always is false, and a hasn't hisotry - second problem: i want to get all information in this step Maybe some other solutions??

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  • jQuery Dialog causing buttons not to post-back

    - by jonathanconway
    I'm using the jQuery UI Dialog() function on an ASP.NET webform, on a particular panel. After Dialog() is applied, the buttons become useless and will not post back at all; I'm not even getting a Page_Load event firing, let alone any button events. Is the Dialog function messing with my button events? If so, is there a way to fix this?

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  • android surfaceview is no longer visible after back from other activity

    - by user308748
    i have a question in developing some android program... i use surfaceview for camera preview. it works fine, but has one problem when i start other activity (by clicking something) and then back from that activity. after that, surfaceview is no longer visible. (but onclicklistener is working) but when i occur surfacecreated/destoryed by visible/invisible surfaceview in single activity, it works very good. plz give me any help.

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  • Intercept back button on uinavigationcontroller?

    - by cannyboy
    A form is pushed onto the view. The form has several required fields. Also the form needs to be validated. I want to intercept the back button's click to check if the fields have been filled in, and validate the form. How would I intercept the button's click, and make sure it doesn't pop to the previous screen?

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  • Visual Studio 2010 editions - switching from Premium (not a trial) to Ultimate trial and back again

    - by Bernard Vander Beken
    I have installed Visual Studio 2010 Premium RTM (not a trial) and would like to run the Visual Studio 2010 Ultimate Trial for a while. What is the fastest way to switch to Ultimate trial and back again to the Premium? My best idea: not uninstalling the Premium edition. running the Microsoft Visual Studio 2010 Ultimate Trial - Web Install testing the Ultimate trial uninstalling the Ultimate trial repairing the Premium installation

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  • Spring redirecting back to referrer

    - by Eqbal
    I have some resources in my application that require redirection to another resource (form) if some context information is not set. After the context gets set (requires two user steps), I need to redirect back to the requested resource. How do I achieve that. I am using annotation based controllers in Spring 3. Is org.springframework.security.web.savedrequest.HttpSessionRequestCache of any use.

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  • Using Subversive to move the head back one revision

    - by Fadi Chalfoun
    Using Eclipse/Subversive I commanded it to delete a branch of mine. Unfortunately it also took the liberty of wiping out my trunk folder. SVN isn't my strong suit so I am trying to figure out how to get Subversive to move it's head back one revision so the trunk/branch that was deleted re-appears again. Anyone have any ideas? Thanks!

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  • Convert XML to Java DTO and back in GWT

    - by RB
    Looking for best approach to convert Java DTO to XML and back while using GWT. I saw GWT has XMLParser in its client package which is a DOM Parser. I'm looking for more like a JAXB kind of plugin feature that I can use with GWT.

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  • Android - Avoiding an activity to destroy, just stopping or pausing it when pushing the back button

    - by Erwan
    Hi, I would like to pausing or putting the application on background when pressing the back button, I don't want the application to go through the destroy state. Things are when I override onKeyDown and when I force to pause or stop the application by using onPause, I have some issuees with the wakelock and application crash, but when I press home button I go through onPause method and I have no exception, it's weird!!

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