C++ :: How Many Streams With A File

Sep 14, 2014

I wanted to know if i could use two streams with a file

fstream fS;
ifstream read;
fs.open("text.txt", ios::in | ios::out | ios::app);
read.open("text.txt", ios:: in);

my aim is to read a record from text.txt in to fs and compare it with other records of text.txt by read

bool checkID(char userID, inStream read);
read.open("text.txt", ios::in);
while (read.good()){
read.getline(id, size);
if(strcmp (id, userID)==0)
return true;
}
return false;

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C/C++ :: How To Structure And Write A Class For Text File Streams

Apr 20, 2014

I need to make a program which reads multiple lines from a text file and stores that information in a vector of structs(the vector class template also needs to be custom made).

One of my requirements is to have a class dedicated for I/O for the text file. At the moment I can't seem to get a way to input the data from a file into a vector from an InputOutput class. This is my code:

InputOutput.h

#include <ostream>
#include <fstream>
#include "Share.h"
#include <string>
#include "Vector.h"
class InputOutput {

[Code] ....

This is the menu selection function in the menu.cpp where i figured i would call the Input file and store it from case 1. I think I'm doing it wrong though. Is there a better way of doing this because at the moment i am getting some errors such as error LNK2019.

void Menu::UserMenuSelection() {
Vector<Share> shares;
std::ifstream infile;
switch (menuOption) {

[Code] ....

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C++ :: Program That Reads Text From A File And Outputs Each Line To The Screen - I/O Streams

Jun 15, 2013

I seem to be missing a concept or 2 here ... I am tasked with writing a program that reads text from a file and outputs each line to the screen as well as to another file PRECEDED by a line number ...

In addition, I have to Print the line number at the start of the line and right-adjusted in a field of 3 spaces ...

Follow the line number with a colon then 1 space, then the text of the line.

Another kicker, is I have to grab the data 1 character at a time and write code to ignore leading blanks on each line.

Here is what I have so far:

#include <iostream>
#include <conio.h>
#include <fstream>
#include <string>
#include <cstdlib>
#include <cctype>
using namespace std;
int main() {
char next;
int count = 0;

[Code] ....

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C++ :: I/O Streams And Data

Apr 27, 2012

The goal is to write a c++ program to read the employee.dat(which is this text file below) file created and produce a duplicate copy of the file named employee.bak.

Anthony A 10031 11.82 12182010
Burrows W 10067 12.14 692011
Fain B 10083 10.79 5182011
Janney P 10095 12.57 9282008
Smith G 10105 9.50 12202006

and then the second question is to modify this program to accept the names of the original and duplicate files as user input.

#include <iostream>
#include <fstream>
#include <cstdlib> // for exit
#include <string>
using namespace std;
int main() {
ifstream inFile;
ofstream outFile;

[Code] .....

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C++ :: Choosing Input Streams

May 23, 2013

So I built an interpreter for a language I made, but I can't get the streams right. I have an istream pointer and if they don't supply a cmd line arg, it references the adress of cin, which works fine. however, if they do supply a file in the form of cmd line args, i want to make it reference an ifstream. how do i do that?

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C# :: Combining Or Merging PDFs From Several Memory Streams

Jul 7, 2014

merging 2 or more pdfs using itextsharp. I have 2 methods that fill a pdf template each and saves them to a memorystream and a downloadAsPDF methods to return the combined pdfs to the broswer. the downloadAsPDF works when i add only one of the memorystream but when i add both MemoryStreams to the list I receive the message...If this message is not eventually replaced by the proper contents of the document, your PDF viewer may not be able to display this type of document.

public byte[] fillTemplateA() {
String NfoodAllergyTemplate = "~/pdfTemplateA.pdf";

[Code].....

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C++ :: Multiple Data Streams In One Class - Handling All In One Member

Jan 24, 2014

I have to implemente the to_string method. Whats the fastest way? Stringstreams. But I have to use C++ without any headers, so I need to implement the stringstream class. How can an stringstream hold one float? An double? Hoq cqn I implement an strigstream myself?

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C :: Program To Hide Files Behind Other Files Using Alternate Data Streams

Apr 5, 2013

I am writing a program to hide files behind other files using Alternate Data Streams in Windows NTFS file systems.

The program is as follows:

Code:

#include <stdio.h>
#include <stdlib.h>
int main(void){
char hostfile[75], hiddenfile[75], hiddenFileName[15] ;
printf("Enter the name(with extension) and path of the file whose behind you want to hide another file: ");
scanf("%75s", hostfile);

[Code]...

The complier is showing error as "Extra Perimeter in call to system" but I am not getting where?

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Visual C++ :: CFileDialog Saves File In Project File - Not Specified File

Apr 12, 2013

I'm very new to MFC & VisualC++. I'm using MSVS2010 Pro. I am trying to write/debug a simple form that saves and restores the content of some edit controls. It seems to work as expected, except the file saves only to the Project Folder, regardless of where I browse and select to save the file.

Code:
void CMFC_FileDialogDlg::OnBnClickedbtnsave() {
this->UpdateData();
CFile f;
//Kinda Correct, Works but still saves in Project Folder
BOOL b_OpenFileDialog = FALSE;//this doesn't act as bool in CFileDialog?

[Code] ....

My only experience is a little simple VB programming in Excel, so any specific examples??? Also, rules seem to change from version to version? I have to "update" a number of undocumented programs.

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C++ :: Multiple Of CSV File Used As Input / Extracting Data To A Output File - Getline Function

Jun 4, 2013

I have written a C++ program I have multiple of CSV file used as input, which I open one at a time and close it after extracting data to a output file which is the only file.

I run getline(inFile,line);
outFile << line << endl;

I run this code, and only part of it is goes to the output file I got, also have spacing randomly to specific file and inconsistent

But when I slower the code, like system("Pause") in the loop, I can get extract what I want perfectly....

Is my program running to fast, why getline would be skipping part of what things I want?

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C :: Program To Calculate Students Grades From Input File And Write To Output File

Aug 29, 2014

One of my class assignments is to create a program that receive a .txt file containing a students name and their grades as follows:

John K. 99, 87, 57, 89, 90, 95
Amanda B. Jones 100, 88, 76, 99, 86, 92
etc..

The number of students is unknown until run time. You have to take those grades and average them weighing the first (4) at 10% a piece and the last (2) at 30% each.

Then return an output file with the students name and their letter grade A,B,C,D,F based on their computed score. In addition, on screen it needs to display the average scores for each Q1, Q2, etc. as well as the minimum and maximum for each test on the screen. I am having a hard time in assigning the scores to a variable so that they can then be computed as an average and then used to determine a letter grade. I have begun to write the code and am a bit stuck..here's what I have so far:

Code:

#include <stdio.h>
#include <stdlib.h>
#include <math.h>

[Code]....

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C++ :: Data File Handling Error - Character Strings Not Copied On Text File

Nov 24, 2013

I have this code for a computer project... (store management) but the character strings are not copied on text file..

#include<iostream.h>
#include<conio.h>
#include<fstream.h>
class Store {
public:
char *item_name[5];
store()

[Code] .....

Now when i run the program, it gives a error :::
ERROR
address 0x0

How can i write these strings to the text file?

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C :: Create File To Write Text And Read Back The File Content

Mar 15, 2013

The Objective Of This Program Is To Create A File To Write Text And Read Back The File Content. To Do That I Have Made Two Function writeFile() To Write And readFile() To Read.The readFile() function works just fine but writeFile() doesn't.

How writeFile() function Works? when writeFile() function Execute It Takes Characters User Type And When Hit Enter(ASC|| 10) It Ask "More?(Y/N)" That Means What User Want? Want To Go Next Line Or End Input?

If "Y" Than Inputs Are Taken From Next Line Else Input Ends.

But The Problem Is When Program Encounters ch==10 It Shows "More?(Y/N)" And Takes Input In cmd variable.If cmd=='Y' I Mean More From Next Line Than It Should Execute Scanf Again To Take ch I Mean User Input.But Its Not!!! Its Always Showing "More?(Y/N)" Again And Again Like A Loop.

Code:
#include <stdio.h>
void writeFile(void);
void readFile(void);
int main(){

[Code].....

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C :: Printing Contents Of A File - Prints One Extra Character Not Present In The File

Feb 12, 2013

I'm writing a program that stores records into a file and then these records can be printed out. A last name, first name, and score is stored to be exactly 36 characters long (using leading spaces to pad) making it easier to retrieve specific records. For example, three records stored in the file would like like this: (the underscores are simply to illustrate the distance, they are not in the file itself)

_______lastname_______firstname__90__________lname __________fname_100___________last___________first __60

When printed out, the names are formatted as follows:

lastname, firstname: 90
lname, fname: 100
last, first: 60

However, when I print them out this is what I get:

lastname, firstname: 90
lname, fname: 100$
last, first: 60H

For some reason, for any record after the first, an extra character is added to the end. These characters are not in the file, so I was thinking that the array for some reason wasn't being filled completely, (the array is initialized to size 36 and 36 characters are read from the file using fread) so it was printing out a random character assigned to the 36th array position. Except the character never changes, (always a $ for record 2, H for record 3, l for record 4 if i remember) and I've tried reducing the array size or the number of character read and it's the string that gets altered, the random character always remains. I figure the problem must be in the print_records function (appending seems to work no problem). Anyway here is my print records and appending records code.

Code: /*
- Prints a single record stored in the file pointed to by ifp.
*/
void print_record(FILE *ifp, int record) {

[Code]......

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C :: Convert List Of Names From One Text File To Email Format In New File

Jan 19, 2014

I have almost a hundred names in a text file that I want to convert to email addresses and save to another file. I seem to have it working, but it doesn't print the full names in the email prefix. The output I'm looking for is Doe_John@livebrandm, but I'm only getting D_J@livebrandm. I'm not sure what I should specifically be reading up on that applies to this directly.

Code:

#include <stdio.h>
#include <stdlib.h>
int main(void)
{
FILE *fpin=fopen("namesIN.txt", "r");
FILE *fpout=fopen("emailOUT.txt", "a");
char first[20],last[20],inbuff[1500];

[Code]...

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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++ :: Implementation File Versus Header File - Eclipse Giving Errors

Feb 10, 2013

I have written my program and it works when I keep everything in the header files, and then have my main. I am now splitting them up into implementation files, but Eclipse keeps giving me errors. It gives me error at every opening brace of the constructor and functions. It says on all of them "Redefinition of (name of constructor or method), Previously declared here." What am I doing wrong, because it works in the header file?

#include "KeyValuePair.h"
template<typename Key,typename Value>
KeyValuePair<Key,Value>::KeyValuePair()

[Code] .....

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C++ :: Overloaded Operator Defined In Header File - Gives Error In CPP File Of Class

Apr 12, 2014

I am working on an assignment in which i have to perform th following task

myClass itsObject1,itsObject2;
itsObject2=5000+itsObject1;

I have defined overloaded operator as follows in the header file but in the cpp file of the class it gives error.

friend vli &vli::operator + (int &a,vli &obj);

How to define it in cpp file of my class?

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C Sharp :: Finding String From Physical Memory Dump File (RAW File)?

Feb 5, 2014

I need to find a string(&login=) from physical memory dump file.And i have to print the word or string following it.Is there any C# code for this problem?

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C++ :: Splitting Template Class To Header H File And Implementation CPP File

Sep 12, 2014

What is the right syntax for implementing the .cpp of a template class?

Consider this LinkedList.h file:
Code: #include<iostream>
#include"Iterator.h"

template <class T>
class LinkedList {

[Code] ....

How should the implementation for the LinkedList constructor, for example, should look like in the LinkedList.cpp file?

I tried this:

Code: #include "LinkedList.h"
template <class T>
LinkedList<T>::LinkedList<T>() {
// constructor
}
LinkedList<T>::~LinkedList<T>() {
// destructor
}

But the compiler wouldn't accept it.

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C++ :: How To Declare Class As Forward In Header File - Regular Use In CPP File

Jan 17, 2015

lets say we have a valid class with full implementation, X. can this class be declared as forward in Y header file:

Code: class X;

class Y{
X* m_X;
}

but still be used as regular in the cpp file?

Code:

#include "Y.h"
#incldue "X.h"
T Y::function(){
m_X->doSomething();
}

visual studio prevents me from doing it , I wonder if the standard also says so.

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C :: How To Read Data In A File And Print It Then Copy Contents To A File

Mar 8, 2013

Code:

#include <stdio.h>
#include <stdlib.h>
int main (int argc, char *argv[])
{
char buffer[256];
FILE * myfile;
myfile = fopen("read.txt","r");

[Code]...

I also got an error in printing wherein the data in read.txt is "Hello" newline "World" and my program prints world twice.

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C :: Reading From A File And Skipping Lines To Find String In File

Nov 26, 2013

Program background: Ticket Sales Details You will sell tickets in advance and at the door. Prices for buying in advance and at the door will be given. Also, the total number of tickets sold in advance will be given. Each guest will have a unique number. If there are n tickets sold in advance, then these guests will be numbered 0 through n-1. As the event starts, requests to buy tickets at the door may be made and these guests will be numbered sequentially, starting at the lowest unassigned number. The maximum number of guests will be 1000. The first line of the file contains the following three values, separated by spaces: Cost of the presales tickets (in dollars), Cost of the tickets at the door (in dollars), and the number of presale tickets. The first two values will be positive real numbers to two decimal places and the last will be a positive integer.

The second line of the file will contain one positive integer representing the number of auction items followed by a positive real value to two decimal places (at most) representing the minimum bid increment, in dollars. The first value is guaranteed to be 1000 or less and the second will be in between 1 and 50, inclusive.

The third line of the file will contain all the prices of the auction items, in dollars, separated by spaces, in order. Thus, the first price is the price of item 0, the next price is the price of item 1, and so on. These values will be real numbers represented to up to 2 decimal places.

The fourth line of the file will contain the three following positive integers pertaining to the raffle: the number of raffle tickets available, the cost of a raffle ticket in dollars, and the number of raffle prizes. (It's strange to have raffle tickets that don't cost a whole number of dollars.)

The fifth line of the file will contain each of the values of the raffle items, in dollars, separated by spaces, in order. Thus, the first price is the price if item 0, the next price is the price of item 1, and so on. These values will be real numbers with upto 2 decimal places.

The sixth line of the file will contain ten positive integers representing the number of each of the drinks 0 through 9, in order, that are in stock.

The seventh line of the file will contain ten positive real numbers with upto 2 decimal places representing the price of each of the drinks 0 through 9, in order.

The eighth line of the file will contain a single positive integer, numEvents, representing the number of events that occur at the charity ball. These events are split into two groups: actions by guests at the ball and awards given (raffle, auction, person, totalrevenue). All of the actions precede all of the awards. You will produce exactly one line of output for each event described. Here are the formats of each event that could occur:

If a patron buys a ticket at the door, a command will be on a line by itself:

BUY TICKET k

where k is a positive integer indicating the number of tickets bought at the door. These guests will be numbered as previously mentioned. You are guaranteed that the total number of tickets bought, including presales, will not exceed 1000. This is what I have so far and I cannot figure out why it wont calculate the total revenue. I am not completely sure if it is even accessing the if statement in main.

Code:

#include <stdio.h> #include <stdlib.h>
#include <string.h>
#define N 1000

[Code].....

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C :: Computing Grades From Input File And Writing To Output File

Aug 31, 2014

One of my class assignments is to create a program that receive a .txt file containing a students name and their grades as follows: John K. 99, 87, 57, 89, 90, 95 Amanda B. Jones 100, 88, 76, 99, 86, 92 etc.. The number of students is unknown until run time. You have to take those grades and average them weighing the first (4) at 10% a piece and the next (2) at 15% each and the final at 30%. Then return an output file with the students name and their letter grade A,B,C,D,F based on their computed score. In addition, on screen it needs to display the average scores for each Q1, Q2, etc. as well as the minimum and maximum for each test on the screen. I am having a hard time in assigning the scores to a variable so that they can then be computed as an average and then used to determine a letter grade. I have begun to write the code and am a bit stuck..here's what I have so far:

Code:
//
// main.c
// Final Exam
//

[Code].....

The problem I'm having now is how to go about passing the grades to the function computeGrade and then compute the average and return that to the function.

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C :: How To Make Text File Of Bits Stored In AVI / Binary File

Feb 5, 2014

I need to create a program which could create text files of the bits stored in avi file/binary file. My first requirement is to show 0s and 1s in the text representation . My second requirement is to create an avi file from this text file. I have tried few codings but either they give me error or they not playing the reconverted binary files.

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C++ :: Decompress Input File And Write Results Into Output File?

Jul 8, 2013

how do i decompress an input file and write the results into an output file?

also my do while loop is supposed to keep going unless the user selects the option to exit the program, instead it exits after finishing ay of the options.

here's my code so far...

#include <iostream>
#include <iomanip>
#include <fstream>

[Code]....

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