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reading file line by line , modify the line and write this line on same file. Python
Because you've used .split on the line, you're working with a list of strings. While a string is conceptually just a list of characters, it's still not a list of strings. Try using the .join method of a string to join your array before you write it out, for example: ''.join(["one, two"]) == "onetwo"

Categories : Python

Most compatible method for reading a file line-by-line in reverse
This method uses sort which will have a high memory overhead cat -n filename | sort -rn | cut -f2- If you have perl installed, you could use a module like File::ReadBackwards.

Categories : Shell

C - Reading line by line from a file - wrong output displayed
fgets() reads the character, if possible. If not, the will be read in the next reading operation. Since your call is fgets(line, 2, fp);, only 1 character is read, and the 2nd is filled with a null character. So: line[0] == '3' and line[1] == ''. The end-of-line will be read later, so your first reading operation, inside the while() loop is just this: " ". This produces arbitrary results with atoi (zeros in your case). Take in account that: fgets(line, N, fp) reads, from the file fp, at most N - 1 characters from stdin, including , if possible. The result is put in line, and ALWAYS makes room at the end for a character.

Categories : C

reading a tab delimited text file line by line get data after in vb.net
RichTextBox_WD.Text = String.Join(vbCrLf, File.ReadLines(vcFile).Select(Function(line) Dim format = "RECEIVED ON: {0} FROM: {1} AMOUNT {2}" Dim fields = line.Split(vbTab) Return String.Format(format, fields(0), fields(1), fields(2)) End Function) I prefer to create a Joined extension method on IEnumerable<T> which wraps String.Join (taking a delimiter and an optional transformation delegate), and a Formatted extension method on String which wraps String.Format: RichTextBox_WD.Text = Fil

Categories : Vb.Net

Reading a file line by line and splitting the string into tokens in c
fgets inserts a newline simply increase val2 size by 1 i.e. val2[10] or remove trailing ' ' while( fgets(line, sizeof(line), fp) != NULL ){ char val1[16] ,val2[9]; char *pos; if ((pos=strchr(line, ' ')) != NULL) *pos = ''; strcpy(val1 , strtok(line,",")); strcpy(val2 , strtok(NULL,",")); printf("%s|%s ",val1, val2); }

Categories : C

How to skip a string when reading a file line by line
You can use std::cin.ignore to ignore input up to some specified delimiter (e.g., a new-line, to skip an entire line). static const int max_line = 65536; std::cin.ignore(max_line, ' '); While many people recommend specifying a maximum of something like std::numeric_limits<std::streamsize>::max(), I do not. If the user accidentally points the program at the wrong file, they shouldn't wait while it consumes an inordinate amount of data before being told something's wrong. Two other points. Don't use while (!file.eof()). It mostly leads to problems. For a case like this, you really want to define a struct or class to hold your related values, define an operator>> for that class, then use while (file>>player_object) ... The way you're reading right now really tries t

Categories : C++

Reading a file line by line backwards
You can do it using the FileReader API. I am not sure if its still in draft or not, but it works in Chrome as well as Firefox. You will have to simply read the file as text using readAsText method. And then split() the string based on and then reverse() and join() again. Here is a jsFiddle example.

Categories : Javascript

Reading File at Certain Line
If your file has a first line that you want to discard and then start parsing the subsequent data you could use the ReadLine method before entering the reading loop Dim delimiter As String = "," Using parser As New TextFieldParser(file) parser.SetDelimiters(delimiter) parser.ReadLine() While Not parser.EndOfData ' Read in the fields for the current line fields = parser.ReadFields()

Categories : Vb.Net

csv file reading only first line
your loop looks like this essentially : foreach (string[] laClient in lsClientList) { int k = 0; string[] records = File.ReadAllLines(ofd.FileName); string[] fields = records[k].Split(splitChar); k++; } Your 'k' value never makes it past 0 for each laClient. You need to loop internally for each line.

Categories : C#

C++ File Stops Reading After First Line
Suggestion: If your file stops reading after the first line then my guess is that it is an issue with your while loop - have you checked to see if the while loop is executing more than once? Use breakpoints in the debugger to do this. I don't think getline() is a valid conditional check but it's worth checking

Categories : C++

script not reading last line of a file
If you do a help read it says for -d delim continue until the first character of DELIM is read, rather than newline. So read will continue until it hits a or if you specify -d delim. So you probably need to change the delim or you can try read -e

Categories : Linux

Efficiently reading a certain line in a file
If you don't need a uniform distribution (i.e. it's okay that the chance for some line to be picked is not equal for all lines) and/or if your lines are all about the same length then the problem of picking the random line can be simplified to: Determine the size of the file in bytes Seek to a random position Search for the last newline character if any (there may be none if there's no preceding line) Pick all text up to the next newline character or the end of file, whichever comes first. For (2) you do an educated guess for how far you've got to search backwards to find the previous newline. If you can tell that a line is n bytes on average then you could read the previous n bytes in a single step.

Categories : Python

Reading each line of a text file into VB
you could open the list in Excel, so that all the data to be manipulated goes into Column A, then use formulas as below to create your UNIX commands in Columns B, C, D: FIRST Command: ="grep -i " &LOWER(LEFT(A:A,FIND(" ",A:A))) & " */*.cfg" SECOND Command: ="grep -i "&LOWER(LEFT(TRIM(MID(A:A,FIND(" ",A:A),LEN(A:A))),FIND(" ",TRIM(MID(A:A,FIND(" ",A:A),LEN(A:A))))))&" */*.cfg" THIRD Command: ="grep -i "&LOWER(MID(RIGHT(A:A,LEN(A:A)-FIND(" ",A:A)),FIND(" ",RIGHT(A:A,LEN(A:A)-FIND(" ",A:A))),LEN(RIGHT(A:A,LEN(A:A)-FIND(" ",A:A)))))&" */*.cfg" Once you have got all your texdt to be manipulated in Column A, copy down the formulas in columns B,C,D then you could run the below code (may need tweaking) to create your output: Sub getCommands() Dim oFso As New

Categories : Excel

Begin the reading of a file from a specific line
Your example code is quite far off, and I don't intend to rewrite all of your code, I will give you some pointers though. You are already doing: if (strLine.startsWith("export") && !strLine.contains("$")) This is your conditional that should be testing for the "HDK1001" string instead of whatever it's doing right now. I'm not sure why you are checking for the word "export" when it seems like it doesn't matter for your program. There isn't a way to just magically start and end at specific words in the file, you MUST start at the beginning and go line by line checking all of them until you find your desired first and last line. Once you find that first line, you can continue reading until you reach your desired end line and then bail out.

Categories : Java

Skip first line while reading CSV file in Java
Create a variable interation and initialize with 0. Check it as very first thing in while loop. String line; int iteration = 0; while ((line = br.readLine()) != null) { if(iteration == 0) { iteration++; continue; } ... ... }

Categories : Java

Reading file in Python one line at a time
Without a little more information, it's hard to be absolutely sure… but most likely, your problem is inappropriate line endings. For example, on a modern Mac OS X system, lines in text files end with ' ' newline characters. So, when you do for line in f:, Python breaks the text file on ' ' characters. But on classic Mac OS 9, lines in text files ended with ' ' instead. If you have some ancient classic Mac text files lying around, and you give one to Python, it will go looking for ' ' characters and not find any, so it'll think the whole file is one giant line. (Of course in real life, Windows is a problem more often than classic Mac OS, but I used this example because it's simpler.) Fortunately, Python has a feature called "universal newlines". For full details, see the link, bu

Categories : Python

Reading a random line from a txt file, then trim it in QT SDK
I don't really understand what you are managing to do but at this line I guess you are getting the number, not the familyname. familyname = line2.at(0); // number familyname = line2.at(1); // family name

Categories : C++

Reading a particular line from a text file in Java
here is how you do it: import java.io.*; public class Test { public static void main(String [] args) { // The name of the file to open. String fileName = "temp.txt"; int counter = 0; // This will reference one line at a time String line = null; FileReader fileReader = null; try { // FileReader reads text files in the default encoding. fileReader = new FileReader(fileName); // Always wrap FileReader in BufferedReader. BufferedReader bufferedReader = new BufferedReader(fileReader); while((line = bufferedReader.readLine()) != null) { counter++; if(counter == 3 || counter == 8 || counter == 12) { // do your code } }

Categories : Java

Reading file from a specific line number in c++
There is an fseek function in C and seekg in C++ that allows you to move to a certain destination in a file. Making it go to a specific line might take some thought on your end though. C++

Categories : C++

Reading the next line in the file and keeping counts separate
Several things: 1. use hash instead of declaring each element. 2. assignment such as $G = (0); is indeed working, but it is not the right way to assign scalar. What you did is declaring an array, which in scalar context $G = is returning the first array item. The correct way is $G = 0. my %seen; $seen{/^([A-Z])/}++ for (grep {/^>/} <INFILE>); foreach $gene (keys %seen) { print "$gene: $seen{$gene} "; }

Categories : Perl

python seek reading file to a specific line
One way to do it manually without heavily exploding the memory could be something like this: f = open('file.txt','r') found = False for line in f if line == '43534': found = True if found: # you now reached the line in the file and # therefore you can begin process it here # in case you need the position of the buffer # you do: f.tell() Hope this helps!

Categories : Python

Reading from a text file with python - first line being missed
Because for line in x iterates through every line. with open('test.txt') as x: for line in x: # By this point, line is set to the first line # the file cursor has advanced just past the first line print(x.read()) # the above prints everything after the first line # file cursor reaches EOF, no more lines to iterate in for loop Perhaps you meant: with open('test.txt') as x: print(x.read()) to print it all at once, or: with open('test.txt') as x: for line in x: print line.rstrip() to print it line by line. The latter is recommended since you don't need to load the whole contents of the file into memory at once.

Categories : Python

How to optimize the reading of a file removing all the line feed characters
int() automatically removes the white-space characters,so there's no need of str.rstrip. >>> int('10 ') 10 >>> int('10 ') 10 >>> int('10 ') 10 You can also use a list comprehension here, it is faster than list.append: import sys with open(sys.argv[1]) as fd: L = [int(line) for line in fd] Why the with statement?: It is good practice to use the with keyword when dealing with file objects. This has the advantage that the file is properly closed after its suite finishes, even if an exception is raised on the way.

Categories : Python

C# Reading only specific lines without reading line by line
If you are looking for a specific row number, you need to read all rows to count them anyway. You can't count the rows without reading the file except if the lines are fixed length. You do not need to save the lines when you read them. Only save the linenumber you need, or handle them without keeping them in memory for later.

Categories : C#

Getting Exception while reading file content using solr line entity processor
BinFileDataSource works with InputStream while FileDataSource. You can try using the FileDataSource instead to check for the Casting issue. <dataSource type="FileDataSource" name = "fds"/>

Categories : Solr

Reading in a full line from .txt file and storing specific information into different strings
If the all words are separated by spaces, then the address alone is not enough information. Consider 123 Biddle Lane Fort Lauderdale FL 33301 How can a "dumb" algorithm know where the division between street and city occurs? It can't. But all is not lost. If all addresses are US, you have a way forward. You can obtain a free database that allows mapping zip codes to city names. This can solve the ambiguity problem in many cases. The algorithm would be something like: Separate the line into words. Say there are N of them. Assume the last is zip code. Look up the zip in database to obtain a state and primary city. Verify N-1'th word is state that matches zip. If primary city from database has M words, assume words N-3-M to N-2 are the city name. Assume the words preceeding th

Categories : C

Reading from .txt file to array one line at a time (Matlab or C). "Insufficient memory" to load the whole file at once using 'A=load()'.
See this answer. If your file is that big, you should not try to load it all at once. You should read it line by line. If this still doesn't work, you should take a look at the csvread function. Edit: Also this link could be quite helpful 2nd Edit: Try the Matfile io

Categories : C

Python 3 - Reading line by line from a textfile and doing action for each line
urlFile = "path/to/file" urls = open(urlFile).readLines() for url in urls: doAction(url) OR you could just put it all in the url file reading loop; with open(urlFile) as f: for line in f: doAction(line)

Categories : Python

Reading input files by line using read command in shell scripting skips last line
DONE=false until $DONE do read line || DONE=true echo $line done < blah.txt How to use `while read` (Bash) to read the last line in a file if there’s no newline at the end of the file?

Categories : Bash

reading each line of text is still performing each line despite my attempted condition
The biggest problem is that you never actually check to see whether any of your regex-matches were successful. When a regex-match is not successful, all capture-groups are the empty string ""; so whenever you process a lineOfText that lacks <ifcontainsand>(.*)</ifcontainsand> and <ifcontainsand2>(.*)</ifcontainsand2>, your if condition is true (since all strings contain the empty string). To check whether a match succeeded, you can use the Match.Success property: if (v4.Success && bomInputTextBox.Text.Contains(s4) && v5.Success && bomInputTextBox.Text.Contains(s5)) {

Categories : C#

Reading All contents of a text document line by line
Here are the tools you need for your task: For reading the lines of the file (Blorgbeard's suggestion): string[] lines = File.ReadAllLines("file.txt"); For getting the values of each line (assuming that the names can be one-word only): string[] values = line.Split(new char[]{' '},4); For converting a value from String to Integer: int intValue = Convert.ToInt32(strValue);

Categories : C#

Issues reading and writing txt files line by line
The problem is that every time you read the file the line break remains at the end of the line. From the description of readline: f.readline() reads a single line from the file; a newline character ( ) is left at the end of the string, and is only omitted on the last line of the file if the file doesn’t end in a newline. If you try self.paths = open(configFile, "r") self.data = self.paths.readlines() for line in self.data: print repr(line) which prints the representation of every line as python code you will get something like 'C:\Program Files ' 'C:\MappedDrives ' 'C:\NVIDIA ' As you later insert further newlines the easiest fix is probably to remove the trailing newline: for line in self.data: strippedLine = line.rstrip(' ')

Categories : Python

SAS/SAS Macro - Reading observation line by Line
Programmers prefer a batch mode kind of approach instead of doing it line by line for faster performance. You can use firstobs and obs in loops. For batchmode, use obs- firstobs as 1000 or some number, for line by line use obs=firstobs+1

Categories : Sas

Is reading multi files line by line possible?
The problem is that you are running out of memory. It is that simple. The quantity of your data is exceeding your RAM. What size are the files? Add them up then compare it to the memory you have on your PC. Remember that c# strings are Unicode - 16 bits per character. Your text files may be 8bits per character but it will always be 16 bits in memory.

Categories : C#

Making a level-reading system for my game C# XNA - wrong reading blocks from the file
Edit: To change at source you should be able to change this line: array[j, h] = int.Parse(Convert.ToString(s[j][h])); From array[j, h] =... to array[h, j] =...

Categories : C#

Reading PGM Image in C (Not Reading File Correctly)
The PGM format goes as P5 wid ht xxx xxx xxx xxx where xxx are the raster values. You need to get rid of each getc function before reading the width, or perform an ungetc when it fails to find the character you are looking for. Then, the width will be read appropriately.

Categories : C

ASP.net C# : How to read 20 to 200 GB file line by line using File.ReadLines(fileName).GetEnumerator()?
As It s a huge file you should read it Seek and ReadBytes methods of BinaryReader. You can see a simple example here. After you use the ReadBytes check for the last new lines and write the process file in certain amount of lines you read. Don t write every line you read and also don t keep all the data in the memory. The rest is in your hands. Maybe it is realted to that one When does File.ReadLines free resources IEnumerable doesn't inherit from IDisposable because typically, the class that implements it only gives you the promise of being enumerable, it hasn't actually done anything yet that warrants disposal.

Categories : C#

Passing each line of a file as command line argument to a binary file
Something this simple would normally be best handled by a "scripting" language, but it's pretty straight foreward in C++ as well. If you're reading your file from standard in: std::string args; while ( std::getline( std::cin, args ) ) { system( ("temp " + args).c_str() ); } should be all you need. (But you don't say what you want to do if temp fails.)

Categories : C++

Reading two-line headers in R
Use readLines with 2 for the limit, parse it, paste0 them together, then read in with read.table with skip =2 and header=FALSE (the default). Finish the process off with assignment of the column names: dat <- "trt biomass yield crop Mg/ha bu/ac C2 17.76 205.92 C2 17.96 207.86 CC 17.72 197.22 CC 18.42 205.20 CCW 18.15 200.51 CCW 17.45 190.59 P 3.09 0.00 P 3.34 0.00 S2 5.13 49.68 S2 5.36 49.72 " You would probably use a file argument but using the text argument to the read-functions makes this more self-contained: readLines(textConnection(dat),n=2) #[1] "trt biomass yield" "crop Mg/ha bu/ac" head2 <- read.table(text=readLines(textConnection(dat),n=2), sep=" ", stringsAsFactors=FALSE) with(head2, paste0(head2[1,],head2[2,]) ) # [1]

Categories : R

Reading a specific line of xml with php
Use this code to loop through $newsxml = simplexml_load_file('http://news.yahoo.com/rss/music'); print "<pre>"; print_r($newsxml->channel); die; And refer the link for getting the media elements RSS XML Parsing issue (How to get media content value from the RSS feed?) Here you can see in the

Categories : PHP



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