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  • How do I clear the contents of a file using c?

    - by Eddy
    I'm writing some code so that at each iteration of a for loop it runs a functions which writes data into a file, like this: int main() { int i; /* Write data to file 100 times */ for(i = 0; i < 100; i++) writedata(); return 0; } void writedata() { /* Create file for displaying output */ FILE *data; data = fopen("output.dat", "a"); /* do other stuff */ ... } How do I get it so that when I run the program it will delete the file contents at the beginning of the program, but after that it will append data to the file? I know that using the "w" identifier in fopen() will open a new file that's empty, but I want to be able to 'append' data to the file each time it goes through the 'writedata()' function, hence the use of the "a" identifier.

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  • Using current database name in T-SQL has Using statement

    - by AmRoSH
    Hello everybody. I have application runs T-SQL statements to update more than one database the problem is i'm using the following t-sql USE [msdb] GO DECLARE @jobId BINARY(16) EXEC msdb.dbo.sp_add_job @job_name=N'test2', @enabled=1, @start_step_id=1, @notify_level_eventlog=0, @notify_level_email=2, @notify_level_netsend=2, @notify_level_page=2, @delete_level=0, @description=N'', @category_name=N'[Uncategorized (Local)]', @owner_login_name=N'sa', @notify_email_operator_name=N'', @notify_netsend_operator_name=N'', @notify_page_operator_name=N'', @job_id = @jobId OUTPUT select @jobId GO EXEC msdb.dbo.sp_add_jobserver @job_name=N'test2', @server_name = N'AMR-PC\SQL2008' GO USE [msdb] GO EXEC msdb.dbo.sp_add_jobstep @job_name=N'test2', @step_name=N'test', @step_id=1, @cmdexec_success_code=0, @on_success_action=1, @on_fail_action=2, @retry_attempts=0, @retry_interval=0, @os_run_priority=0, @subsystem=N'TSQL', @command=N'EXEC sp_MSforeachdb '' EXEC sp_MSforeachtable @command1=''''DBCC DBREINDEX (''''''''*'''''''')'''', @replacechar=''''*''''''', @database_name=N'Client5281', @output_file_name=N'C:\Documents and Settings\Amr\Desktop\Scheduel Reports\report', @flags=2 GO USE [msdb] GO DECLARE @schedule_id int EXEC msdb.dbo.sp_add_jobschedule @job_name=N'test2', @name=N'test', @enabled=1, @freq_type=8, @freq_interval=1, @freq_subday_type=1, @freq_subday_interval=0, @freq_relative_interval=0, @freq_recurrence_factor=1, @active_start_date=20100517, @active_end_date=99991231, @active_start_time=0, @active_end_time=235959, @schedule_id = @schedule_id OUTPUT select @schedule_id GO and i'm using (USE [msdb]) before any block and i want to get database name to replace this @database_name=N'**Client5281**', with the current database name instead of ([msdb]) that i'm using. i hope that i explained what i want well.

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  • jQuery wait for ajax call to be over before continuing

    - by Flo
    Hi all, I have a problem with a jQuery ajax call. I need to wait for the call to be finished in order to return a value. However, the script seems to jump ahead and not wait for the call to be over. my function then returns "undefined". I have tried to use the .ajax() method and set the value of async to false, but this would not work either. I could I get my function to return the value that I could through the ajax call? Thank you! Here is the code: function get_rsrce_name(){ jQuery.post( '<?php echo admin_url( 'admin-ajax.php' ); ?>', { action :'my_action', option_rsrce : 'option_rsrce' }, function( data ) { output = data.option_name; }, "json" ); return output; }

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  • How to read the whole istream correctly?

    - by L.Lawliet
    Here is a simple code to print all characters of a txt file on screen: #include <iostream> #include <fstream> #include <string> using namespace std; int main() { int **i; int j,k; char a; ifstream test("test.txt", ios::binary); while((a=test.get())!=-1)//if I use "while(!test.eof())" here, how to avoid the output of the last character(-1) to std::cout, or any ostream objects? { putchar(a);//also change this to putchar(test.get()); } getchar(); } As I noted in the code, if I use "test.eof()" to judge the end of test.txt, I'll always get an extra blank at the end of the output. How to avoid it?

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  • Cocoa - Localized string from NSDate, NSCalendarDate...

    - by SirRatty
    I'm using NSDate to get a string such as "18 Jun 09", with code: NSDate *theDate = [NSDate date]; NSString *dateString = [theDate descriptionWithCalendarFormat:@"%d %b %y" timeZone:nil locale: nil]; This works, but only results in an English output. I need the output to be localized in the user's default language. Does Cocoa (Mac OS X 10.4, 10.5 in this case) provide a facility for this localization or do I have to manually localize for each case of day and & month names my self? (I have provided a locale, but although that does provide a locale-specific ordering of the date, it does not appear to do any localization of day-month names.)

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  • how to split string with some seperator but without removing that seperator in Java?

    - by sag
    Hi, I m facing problem in splitting string. Actually i want to split a string with some seperator but without loosing that seperator. when we use somestring.split(String seperator) method in java it splits the string but removes the seperator part from string.It should not happen. I want result like below: Example::string1="Ram-sita-laxman"; seperator="-"; string1.split(seperator); output : [Ram, sita, laxman] but i want the result like :[Ram, -sita, -laxman] is there a way to get output like this?

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  • Storing and retrieving CGPoints inside NSMutableArray

    - by Matt Dice
    I've looked through countless questions on here and elsewhere and cannot for the life of me figure out what I'm doing wrong. I'm trying to store an array of CGPoints as NSValues inside of an NSMutableArray named points like so on the iPhone: NSValue *point = [NSValue valueWithCGPoint:firstTouch]; NSLog(@"NSValue *point = %@", point); [points addObject:point]; NSLOG OUTPUT NSValue *point = NSPoint: {120, 221} Everything is going smooth converting from the CGPoint to NSValue. But when I try to retrieve the point I get nothing. NSValue *getPoint = [points objectAtIndex:0]; CGPoint thePoint = [getPoint CGPointValue]; NSLog(@"Point = %@", NSStringFromCGPoint(thePoint)); NSLOG OUTPUT Point = {0, 0} The points should be the same but I'm getting a null result. For testing purposes this is happening in the touchesBegan method. Does anyone have any idea where I'm going wrong? Thanks in advance.

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  • Setting a Global Doctype

    - by Batfan
    Is it possible using PHP (I was thinking may the phpinfo file or a php.ini file) or an .htaccess file to set a doctype for an entire subdirectory? Basically, in a nutshell, I'm using a software that uses XSL templates to output data to a set of HTML files. Modifying the xsl:output tag to include the doctype breaks the template and therefore, does not work. Just adding the doctype in the XSL file, breaks it as well. I need the proper doctypes in place for my CSS to function properly, cross-browser. I realize that I could add the doctype to the HTML files after export but, I'm really striving to automate this process. Any thoughts?

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  • c# convert file from one format to another

    - by JOE SKEET
    i have a bunch of files that need to be converted. the beginning files look like this: Well ID,Error code,Sample Barcode A1,0,THC_CAL1 B1,0,THC_CAL2 C1,1,THC_CAL3 D1,0,THC_CAL4 E1,0,THC_QC1 F1,0,THC_QC2 G1,0,THC_QC3 H1,0,THC_QC4 A2,0,BLANK0609 B2,0,AA178121 C2,0,CC37815 D2,0,BLANK0610 E2,0,CC37819 F2,0,N150680 G2,0,BLANK0611 H2,0,AA127900 A3,0,AA26940 B3,0,BLANK0612 ........... the output needs to look like this: A01 THC_CAL1 B01 THC_CAL2 D01 THC_CAL4 //please note that c1 is gone since it did not have a 0 in the middle column E01 THC_QC1 F01 THC_QC2 G01 THC_QC3 H01 THC_QC4 A02 BLANK0609 B02 AA178121 C02 CC37815 D02 BLANK0610 E02 CC37819 F02 N150680 G02 BLANK0611 H02 AA127900 A03 AA26940 B03 BLANK0612 H10 BLANK0234 //please notice that there is H10 and not H010 what would be the best way to read this file into a variable and then output this into a new file? should i read it line by line or should i read it into a datatable?

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  • improve my python program to fetch the desire rows by using if condition

    - by user2560507
    unique.txt file contains: 2 columns with columns separated by tab. total.txt file contains: 3 columns each column separated by tab. I take each row from unique.txt file and find that in total.txt file. If present then extract entire row from total.txt and save it in new output file. ###Total.txt column a column b column c interaction1 mitochondria_205000_225000 mitochondria_195000_215000 interaction2 mitochondria_345000_365000 mitochondria_335000_355000 interaction3 mitochondria_345000_365000 mitochondria_5000_25000 interaction4 chloroplast_115000_128207 chloroplast_35000_55000 interaction5 chloroplast_115000_128207 chloroplast_15000_35000 interaction15 2_10515000_10535000 2_10505000_10525000 ###Unique.txt column a column b mitochondria_205000_225000 mitochondria_195000_215000 mitochondria_345000_365000 mitochondria_335000_355000 mitochondria_345000_365000 mitochondria_5000_25000 chloroplast_115000_128207 chloroplast_35000_55000 chloroplast_115000_128207 chloroplast_15000_35000 mitochondria_185000_205000 mitochondria_25000_45000 2_16595000_16615000 2_16585000_16605000 4_2785000_2805000 4_2775000_2795000 4_11395000_11415000 4_11385000_11405000 4_2875000_2895000 4_2865000_2885000 4_13745000_13765000 4_13735000_13755000 My program: file=open('total.txt') file2 = open('unique.txt') all_content=file.readlines() all_content2=file2.readlines() store_id_lines = [] ff = open('match.dat', 'w') for i in range(len(all_content)): line=all_content[i].split('\t') seq=line[1]+'\t'+line[2] for j in range(len(all_content2)): if all_content2[j]==seq: ff.write(seq) break Problem: but istide of giving desire output (values of those 1st column that fulfile the if condition). i nead somthing like if jth of unique.txt == ith of total.txt then write ith row of total.txt into new file.

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  • Problem overridding virtual function

    - by William
    Okay, I'm writing a game that has a vector of a pairent class (enemy) that s going to be filled with children classes (goomba, koopa, boss1) and I need to make it so when I call update it calls the childclasses respective update. I have managed to create a example of my problem. #include <stdio.h> class A{ public: virtual void print(){printf("Hello from A");} }; class B : public A{ public: void print(){printf("Hello from B");} }; int main(){ A ab = B(); ab.print(); while(true){} } Output wanted: "Hello from B" Output got: "Hello from A" How do I get it to call B's print function?

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  • simple putStrLn in Haskell/Yampa with arrows syntax

    - by sisif
    i'm using Haskell with the Yampa FRP library which uses the arrows language extension. how can i do a simple putStrLn in a SF? mySF = proc x -> do y <- identity -< x*x putStrLn "Hello World!" ++ show y returnA -< y the arrow syntax complains about the expression not bein an arrow (of course), but even with arrows i get no output output <- identity -< putStrLn "Hello World!"

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  • Get variable name as string in Perl

    - by Jose Cuervo
    Hi, I am trying to get a text representation of a variable's name. For instance, this would be the function I am looking for: $abc = '123'; $var_name = &get_var_name($abc); #returns '$abc' I want this because I am trying to write a debug function that recursively outputs the contents of a passed variable, I want it to output the variable's name before hand so if I call this debug function 100 times in succession there will be no confusion as to which variable I am looking at in the output. I have heard of Data::Dumper and am not a fan. If someone can tell me how to if it's possible get a string of a variable's name, that would be great. Thanks!

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  • Does MultiThreading in Java takes much time for task completion?

    - by Geeta
    I have to search for a string in 10 large size files (in zip format 70 MB) and have to print the lines with the search string to corresponding 10 output files.(i.e. file 1 output should be in output_file1...file2--- output_file2). The same program takes 15 mins for a single file. But if use 10 threads to read 10 files and to write in 10 different files it should complete in 15 mins but its taking 40 mins. How can I solve this. Or multithreading will take this much time only?

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  • How do I bypass GUI in MFC app if command line options exist?

    - by Brandon
    I've got an existing simple MFC app that the user specifies the input file, output file, and then a "Process" button. I'd like to just add the capability so that the input/output files are command line parameters. But, if they exist, I don't want the GUI to show up. I just want the "Process" to execute. I see where I can get the command line parameters (m_lpCmdLine) but how can I bypass the displaying of the GUI? If I step into the app, it goes directly to winmain.cpp and displays the GUI without stepping into any of my code.

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  • Show surrounding words when searching for a specific word in a text file (Ruby)

    - by Ezra
    Hi, I'm very new to ruby. I'm trying to search for any instance of a word in a text file (not the problem). Then when the word is discovered, it would show the surrounding text (maybe 3-4 words before and after the target word, instead of the whole line), output to a list of instances and continue searching. Example "The quick brown fox jumped over the lazy dog." Search word = "jumped" Output = "...brown fox jumped over the..." Any help is appreciated. Thanks! Ezra def word_exists_in_file f = File.open("test.txt") f.each do line print line if line.match /someword/ return true end end false end

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  • How to call an xslt transform into an xsl stylesheet

    - by Mycol
    I have written an xslt that reads some xml file names and does some operations on them. I use a for-each to work them one-by-one. I have each path inside a parameter $path. But now I would like to output the result of applying an external stylesheet to those files. I would write something like <div> <something like xsl-transform($extern-xslt,$path)> </div> to have the result tree of the transformation inside the main html output. It is possible?

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  • Using scanf() in C++ programs is faster than using cin ?

    - by zeroDivisible
    Hello, I don't know if this is true, but when I was reading FAQ on one of the problem providing sites, I found something, that poke my attention: Check your input/output methods. In C++, using cin and cout is too slow. Use these, and you will guarantee not being able to solve any problem with a decent amount of input or output. Use printf and scanf instead. Can someone please clarify this? Is really using scanf() in C++ programs faster than using cin something ? If yes, that is it a good practice to use it in C++ programs? I thought that it was C specific, though I am just learning C++...

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  • Rails streaming file download

    - by Leonard Teo
    I'm trying to implement a file download with Rails. I want to eventually migrate this code to using S3 to serve the file. I've copied the Rails send_file code almost verbatim and I cannot seem to get it to stream a file to the user. What happens is that it sends 'a' file to the user, but the downloaded file itself simply contains the text.inspect of the Proc: # What am I doing wrong here? options = {} options[:length] = File.size(file.path) options[:filename] = File.basename(file.path) send_file_headers! options render :status => 200, :text => Proc.new { |response, output| len = 4096 File.open(file.path, 'rb') do |fh| while buf = fh.read(len) output.write(buf) end end } Ps: I've read in a number of other posts that it's not advisable to send files through the Rails stack, and if possible serve using the web server, or in the case of S3 use the hashed URL it can provide. Yes, we really do want to serve the file through the Rails stack.

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  • Finding position of each word in a sub-array of a multidimensional array

    - by Shreyas Satish
    I have an array: tokens = [["hello","world"],["hello","ruby"]] all_tokens = tokens.flatten.uniq # all_tokens=["hello","world","ruby"] Now I need to create two arrays corresponding to all_tokens, where the first array will contain the position of each word in sub-array of tokens. I.E Output: [[0,0],[1],[1]] # (w.r.t all_tokens) To make it clear it reads, The index of "hello" is 0 and 0 in the 2 sub-arrays of tokens. And second array contains index of each word w.r.t tokens.I.E Output: [[0,1],[0],[1]] To make it clear it reads,the index of hello 0,1. I.E "hello" is in index 0 and 1 of tokens array. Cheers!

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  • How to order by results from 2 seperate tables in PHP and MySQL.

    - by Vafello
    I am trying to output results of 2 sql queries to one JSON file. The problem is that I would like to order them ascending by distance which is the result of equation that takes homelat and homelon from the users table and lat, lng from locations table.(basically it takes lattitude and longitude of one point and another and computes the distance between these points). Is it possible to take some parameters from both select queries, compute it and output the result in ascending order? $wynik = mysql_query("SELECT homelat, homelon FROM users WHERE guid='2'") or die(mysql_error()); ; $query = "SELECT * FROM locations WHERE timestamp"; $result = map_query($query); $points = array(); while ($aaa = mysql_fetch_assoc($wynik)) { while ($row = mysql_fetch_array($result, MYSQL_ASSOC)) { array_push($points, array('name'=>$row['name'], 'lat'=>$row['lat'], 'lng'=>$row['lng'], 'description'=>$row['description'], 'eventType'=>$row['eventType'], 'date'=>$row['date'], 'isotime'=>date('c', ($row['timestamp'])), 'homelat'=>$aaa['homelat'], 'homelon'=>$aaa['homelon'])); } echo json_encode(array("Locations"=>$points));

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  • empty() returning TRUE on object's non-empty property

    - by Michal M
    I've got a very weird and unexpected problem. empty() is returning TRUE on a non-empty property for a reason unknown to me. class MyObject { private $_property; public function __construct($property) { $this->_property = $property; } public function __get($name) { $priv_name = "_{$name}"; if (isset($this->$priv_name)) { return $this->$priv_name; } else { return NULL; } } } $obj = new MyObject('string value'); echo $obj->property; // Output 'string value' echo empty($obj->property); // Output 1 (means, that property is empty) Would this mean, that the __get() magic function is not called when using empty()? btw. I'm running PHP version 5.0.4

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  • Python subprocess.Popen hangs in 'for l in p.stdout' until p terminates, why?

    - by Albert
    I have that code: #!/usr/bin/python -u localport = 9876 import sys, re, os from subprocess import * tun = Popen(["./newtunnel", "22", str(localport)], stdout=PIPE, stderr=STDOUT) print "** Started tunnel, waiting to be ready ..." for l in tun.stdout: sys.stdout.write(l) if re.search("Waiting for connection", l): print "** Ready for SSH !" break The "./newtunnel" will not exit, it will constantly output more and more data to stdout. However, that code will not give any output and just keeps waiting in the tun.stdout. When I kill the newtunnel process externally, it flushes all the data to tun.stdout. So it seems that I can't get any data from the tun.stdout while it is still running. Why is that? How can I get the information? Note that the default bufsize for Popen is 0 (unbuffered). I can also specify bufsize=0 but that doesn't change anything.

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