C++ :: CSV Parser - Infile Using Variable Filename?

Jan 18, 2013

So. I have a CSV Parser that I built. It works very well. The way it currently works is that I have the parser in a header file "CSV_Parser". So my .cpp code would look like this:

#include <iostream>
#include <eigen3/Eigen/Dense>
#include "CSV_Parser.h"
using namespace std;
using Eigen;

[Code] ....

This all works great. I am running Eclipse in Linux (Xubuntu to be precise). In the header file the .csv is opened as follows:

ifstream infile;
infile.open("/home/karrotman/Desktop/Matrix.csv");

What I would like is for the user to be able to change the file that the parser is opening through the main .cpp file. In other words, is there a way to create some variable, say "FileName" and do the following:

CSV firstMat;
string MatrixA = "/home/karrotman/Desktop/Matrix1.csv";
firstMat.extract(MatrixA);
CSV secondMat;
string MatrixB = "/home/karrotman/Desktop/Matrix2.csv";
secondMat.extract(MatrixB);

And then the .h would now say:

void extract(string FileName)
...
ifstream infile;
infile.open(FileName);

Obviously this does not work. Ultimately the goal is for me to open 4 .csvs at one time so I can do numerical operations on them.

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C++ :: How To Transfer Selected Values From InFile Into OutFile

Jul 8, 2014

My assignment asks me to read inputs from a certain file which has data as shown below:

else if (menu == 3) {
ofstream outFile("output.txt");

Shares share1 = shareList.get(0);
double price1 = share1.getTradePrice();
time24 time1 = share1.getT();

[Code] ....

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C++ :: Filename Does Not Change

Sep 26, 2012

this is the code:

Code:
#include <stdio.h>
#include <string>
#include <iostream>
using namespace std;
int main () {
int result,i,j;

[Code] ....

and it doesn't find it. it says the the word:"Users" is incorrectly formed universal character name ....

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C++ :: Just Get Filename From Wstring?

Jun 15, 2012

I have a file path in a wstring like this:

wstring pathName = L"c:windowssystem est.exe";

I want to be able to geta new wstring that just contains "test" from this wstring.

How can I do that?

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C :: Passing Filename As A Parameter

Aug 23, 2013

Code:
#include <stdio.h>
void ASCII_to_EBCDIC( size_t, unsigned char *);
void EBCDIC_to_ASCII( size_t, unsigned char *);
void to_ASCII(unsigned char *);
void to_EBCDIC(unsigned char *);
/* conversion tables */
static unsigned char

[Code] ....

The above snippet is for a buffer/string, where as i want to pass file name as a parameter and want function to process the file line by line?

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C++ :: Insert Char To Filename

Sep 1, 2014

I have lots of files needed for program named text1,text2, etc. I tried to do a loop like this:

ofstream of;
for(char i='1';i<'9';i++)
{
of.open("text"<<i<<".txt");
}

I tried without << too, but it doesn't work neither. How can I make it work, without writing a line for each operation?

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C :: File Could Not Be Opened While Filename Seems Correct

Feb 10, 2013

I'm new to C and encountered a weird problem. Here's the code:

int main(){
char name[]="";
readname(name) ;
printf("The filename is: %s
",name);
printf(name);

[Code] ....

I compile this with no problem, but gives "File could not be opened". the strcmp tells me name and "snazzyjazz.txt" are not equal. but when I print them I get the same output.

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C :: File Contents Printing And Saving With Filename Whenever Try To Send

Jan 2, 2015

I am trying to establish a connection between client and server to send a file to the server from a client. I have been successfully able to send files to the server but i am facing a problem with the the filename whenever i try to send any string to the server and use it in naming the filename at the server side, the string is successfully concatenated but it saves the filecontents in the filename.

for example: i am sending a file hello1.txt to server and the server has to save it as abcxyz.txt as i am sending the "xyz" from the client. BUT Whenever i am doing this ,the file saves as abcxyzfilecontents.txt If i saved in the .txt file "you123" ,my file at server side would save as abcxyzyou123.txt

Here are my codes:

Know that the server code implements a multi threaded server. The functionality to be discussed is defined in myfunc

Code:
server.c:
#include <stdlib.h>
#include <stdio.h>

[Code].....

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C/C++ :: Writing To Text File With User Declared Filename?

Apr 21, 2014

I am wanting to have a text file which is named with the user input and appended with .txt.

cout << "Please enter a new filename for storing new coordinates in: ";
char name[50];
ofstream output;
cin.getline(name, 50);
output.open(name + ".txt");

Get an error with this code on ".txt".

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C :: Simple File Parser

Oct 5, 2013

I am writing a simple file parser for use in another project (for config file). The trickiest thing seems to be skipping unwanted characters (comments, spaces). It works partly, but after the second line of an inputed file processes only the first three characters.

Code:
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#define TEXT_FILE "data.txt"
[code]....

NOTE: Currently I am just trying to process and remove unwanted data, the actual processing of extracted data should be much simpler.

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C/C++ :: Recursive Descent Parser?

Mar 22, 2014

I am implementing a recursive descent parser that recognizes strings in the language below.

The grammar:
A -> I = E | E
E -> T + E | T - E | T
T -> F * T | F / T | F
F -> P ^ F | P
P -> I | L | UI | UL | (A)
U -> + | - | !
I -> C | CI
C -> a | b | ... | y | z
L -> D | DL
D -> 0 | 1 | ... | 8 | 9

My input file has the following two strings:
a=a+b-c*d
a=a**b++c

The desired output:

String read from file: a=a+b-c*d
The string "a=a+b-c*d" is in the language.
String read from file: a=a**b++c
The string "a=a**b++c" is not in the language.

[Code].....

When I test the code without reading the text file and just write a string in the source code, it appears to parse fine. I believe my main problem is in the int main function and how i am reading the text file and outputting it. I was able to write the same program fine in Java.

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C++ :: Expression Parser Implementation?

May 5, 2014

How can we implement an expression parser in C++.

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C++ :: Running A SLR Parser Program?

Apr 27, 2012

I need to run a program that makes a SLR Parser Table.

Here is the code :

Code to find first and follow:

saved as SLR.h
#include<stdio.h>
#include<ctype.h>
#include<conio.h>
#include<stdlib.h>
#include<string.h>
#include<iostream.h>
#define epsilon '^'

since I didn't know how to type epsilon symbol temporarily I am using ^

char prod[20][20],T[20],NT[20],c[10][10],foll[10][10],fir[10][10];
int tt,tnt,tp,a;
int follow[20][20],first[20][20];
void first_of(char);
int count(int j);
void rhs(int j);

[code]....

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C++ :: Parser Does Not Name A Type Error

Oct 22, 2014

I am trying to write a program that reads in an XML file, parses it and prints out information about each tag. I am getting the following errors when trying to build the program:

Parser.cpp:24:1: error: 'Parser' does not name a type
Parser::getXMLData() {
^
Parser.cpp:120:1: error: 'Parser' does not name a type
Parser:rocessXMLData(

[Code] ....

Here is my code for the 5 files.

[ATTACH]main.cpp
[/ATTACH][ATTACH]Parser.h
[/ATTACH][ATTACH]Parser.cpp
[/ATTACH][ATTACH]Element.h
[/ATTACH][ATTACH]Element.cpp[/ATTACH]

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C :: Text Parser - String Separation

Jan 4, 2015

I would like to make a sort of text parser, in which one enters a string, and it is broken by the whitespaces into chunks, and those chunks compared to different "dictionaries" where the words are assigned a value. For example if the operator enters "take lamp" it would separate "take" and "lamp" and then produce preassigned values for each of these words.

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C :: Simple Parser / How To Deal With Slashes

Feb 13, 2013

I've knocked up a rough C parser for the purpose of colourizing code into XHTML/CSS, which makes me feel fancy. However, it doesn't quite handle comments properly. I can't quite work out how to deal with the slashes. Plus I'm sure there are other places that it slips up that don't feature in my simple tests, so here you go:-

Code:

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#define FLAG_OUTPUT1
#define FLAG_EVEN2
#define NUMKEYWORDS32
}

[code]....

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C++ :: Getting Segmentation Fault In Parser Code

Dec 23, 2014

For some reason when i put cout<<endl i'm getting segmentation faults in my Parser code. It's really weird some inputs of strings using cout is already faulting. However sometimes printf doesn't fault, but sometimes it will, it seems really unstable.

The court can basically be anywhere in the Parse(string) function, i have a cout at line 254 which faults.

Here is the code:

#include "Parser.h"
#include <stdio.h>
#include <iostream>
using namespace std;
Parser::Parser() {

[Code] ....

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C/C++ :: How To Do Error Handling In Predictive Parser

May 9, 2014

#include<iostream>
using namespace std;
void E();
void T();
void F();
void match(char m);

[Code] ....

I have written this code for predictive parser. It is working for valid input but it is not working for invalid input when i give invalid input it says its valid. How to do error handling in predictive parser.

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C++ :: Libjson Non-recursive Parser Function

Oct 8, 2013

how to write a non-recursive JSON parser function using libjson in C++. libjson is quite useful librray. It's source code of libjson comes with an example C++ parser but it uses recursion to parse JSON arrays and child nodes. I am looking for parser function based on libjson that does not use recursion to parse JSON arrays and child nodes.

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C++ :: SIP Parser And Header File Including (using Sofia-sip)

Nov 6, 2012

I am currently developing a small quick'n dirty SIP (Session Initiation Protocol) parser. Its task is to read a file (or command-line argument) with a SIP requst and parse it using the sofia-sip library. It should exit either with "1" on parsing failure or "0" on parsing success.

I have taken the code snipplet from here: [URL] .... resulting in this source code:

Code:
#include <iostream>
#include <stdio.h>
#include <sofia-sip/msg.h>
#include <sofia-sip/msg_parser.h>
#include <sofia-sip/msg_mclass.h>
int main() {
char *msg_data = "...";

[Code] ....

When I try to compile the code using

Code:
g++ -o parser -I/usr/include/sofia-sip-1.12 parser.cpp

I get the following failure:

Code:
parser.cpp:10:45: error: "sip_default_mclass" was not declared in this scope ....

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Visual C++ :: Writing A Lexical Analyzer / Parser

Oct 6, 2012

I'm trying to learn more about how Lexical Analyzers/Parsers work. I haven't coded any classes yet, because i'm not really sure how the entire process from a Lexer to working code goes.

My goal is to write a simple made up programming language and translate that to another language, like Javascript. The first thing i have to do is give the code to a Lexical Analyzer.

The lexer will split the source into tokens and assign a label to it. So suppose i have the following code:

Code:
def myVar = 10;

The lexer will split that into token like this:

Code:
def -> keyword
myVar -> Identifier
= -> Operator
10 -> Number

That's basically as far as i understand what a lexer does. How can i translate the tokens to a language like Javascript? From what i understand i need to write a Parser class. But i couldn't find any info on what that class exactly does. So what is exactly the next step i have to take?

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C++ :: Evaluating Arithmetic Expressions Using Recursive Descent Parser?

Feb 25, 2013

I have the following code to calculate arithmetic expressions :

#include <iostream>
using namespace std;
using namespace std;
const char * expressionToParse = "6.5-2.5*10/5+2*5";
char peek(){
return *expressionToParse;

[code]....

The problem is that it does not work properly with decimal numbers for example it evaluates 6-2*10/5+2*5 = 12 which is correct but for 6.5-2.5*10/5+2*5 it returns 6 instead of 11.5 .

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C++ :: Program That Handles Configuration Files - Config Parser?

Apr 9, 2013

I wrote a small program that handles configuration files. I was wondering if this code is considered "good?" I am also wondering if there are ways to optimize it.

class configFile {
std::vector<std::string> variables;
std::vector<std::string> values;
public:
/* declare the constructor function */
configFile(std::string loc) {

[Code] ....

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C/C++ :: How To Open Filename Which Is In One Class And Then Use That In Different Class

Apr 20, 2012

I have written some c++ code in codeblocks but I am getting errors when i am trying to compile it. I have a file named files.txt and this file consists of the names of the files that actually contain the data that I need to present. I am trying to get the name of files from from once class and passing it through to another to process. These are the codes that i have:

main.cpp
#include <iostream>
#include <fstream>
#include <string>
#include "Files.h"
#include "Datafile.h"  
using namespace std;  
int main() {
    ifstream infile("fileListAug.txt");

[Code] .....

The error message that i get is error: no match for call to (std:: string). For ther line with the error I have used (*******Error points to this line).

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C :: Writing A Simple File / Text Parser To Read A Config File

Feb 6, 2014

I am writing a simple file/text parser to read a config file for some code I am working on. It's dead simple and not particularly smart but it should get the job done. The code reads a config file:

Code:

readlength=2500000
start=0
finish=25000000
cutoff=20000
samplingfreq=250000
poles=10
filterpadding=500
}

[code]....

Here is where it gets wierd. You'll notice that there is an unused variable (filepath) in the config struct. This variable is not referenced or used anywhere in the code, ever. Yet if I comment out the declaration of char filepath[1024], the code segfaults partway through the read_config() function.

My best guess is that there is a buffer overflow elsewhere and it just so happens that the memory allocated for filepath happened to be there to catch it up until now, but I can't work out where it might be happening. With the declaration commented out, the read_config() function gets as far as reading the "padding" variable before it crashes. Yet when the declaration is there, then all the variabled are read correctly and everything seems to work.

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C++ :: Type Conversion - Float Or Double Variable Into Unsigned Char Variable And Back

May 10, 2013

I would like to convert a float or double variable into unsigned char variable and back.

float number_float = 23.453f;
unsigned char* number_char = (unsigned char*)malloc(sizeof(float));
number_char = reinterpret_cast<unsigned char*> (&number_float);
float* number_float_0 = reinterpret_cast<float*>(&number_char);

I am not getting the same value back.. why?

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