In this function what I have to do is pass the strings from txt file in char and do some operations. My only problem is on pass file from txt to char. how i should fix it?
char* foo(string& input){
stringstream ss;
ss<<input;
char *elements=new char[32];
elements[32]='\0';
ss>>elements; //next part code not written because useless
This is how you can store data in a char array from a file:
Source File
#include <iostream>
#include <fstream>
using namespace std;
int main()
{
ifstream inFile;
inFile.open("Input File.txt");
char Array[50] = { ' ' };
inFile.get(Array, 50);
cout << "Output : " << Array << endl;
inFile.close();
}
Text File
Enter Text Here
If you want i can make a dynamic array for you which will have the exact size as the string (Data you input) from file or use vectors because they can easily be expanded and shortened in late binding(means: during program execution).
Related
I'm working on a project for school and I need to read in text from a file.
Sounds easy peasy, except my professor put a restriction on the project: NO STRINGS
("No string data types or the string library are allowed.")
I've been getting around this problem by using char arrays; however, I'm not sure how to use char arrays to read in from a file.
This is an example from another website on how to read in a file with strings.
// reading a text file
#include <iostream>
#include <fstream>
#include <string>
using namespace std;
int main () {
string line;
ifstream myfile ("example.txt");
if (myfile.is_open())
{
while ( getline (myfile,line) )
{
cout << line << '\n';
}
myfile.close();
}
else cout << "Unable to open file";
return 0;
}
The important line here is while ( getline (myfile,line) );
getline accepts an ifstream and a string (not char array).
Any help is appreciated!
Use cin.getline. Refer to this site for the format: cin.getline.
You can write something like this:
ifstream x("example.txt");
char arr[105];
while (x.getline(arr,100,'\n')){
cout << arr << '\n';
}
ifstream has a method named get() that reads the contents of the file into a char array. get() takes, as parameters, a pointer to the array, and the size of the array; then fills the array up to the given size, if possible.
After get() returns, use the gcount() method to determine how many characters have been read.
You can use then, and a simple logical loop, to repeatedly read the contents of the file, in size-chunks, into an array, and collect all the chunks read into a single array, or a std::vector.
You can use the int i = 0; while (scanf("%c", &str[i ++]) != EOF) to judge the end of text input. str is the char array include newline which you wanted, and i is the input size.
You can also use while(cin.getline()) to read per line every loop in C++ style:
istream& getline (char* s, streamsize n, char delim ); just like below:
const int SIZE = 100;
const int MSIZE = 100;
int main() {
freopen("in.txt", "r", stdin);
char str[SIZE][MSIZE];
int i = -1;
while (cin.getline(str[++ i], MSIZE)) {
printf("input string is [%s]\n", str[i]);
}
}
I am trying to count the characters in my program. Initially my variable "words" was a char and the file read just fine. When trying to determine the length of the variable, it wouldn't work with .length(). Can you explain how I can make my "words" variable as a string so that the words.length() executes correctly?
error on line words = readFile.get(); is:
no match for ‘operator!=’ in ‘words != -0x00000000000000001’
#include <iostream>
#include <cmath>
#include <fstream>
#include <cstdlib>
#include <string>
#include <stdio.h>
#include <math.h>
using namespace std;
int main() {
//buff array to hold char words in the input text file
string words;
//char words;
//read file
ifstream readFile("TextFile1.txt");
//notify user if the file didn't transfer into the system
if (!readFile)
cout <<"I am sorry but we could not process your file."<<endl;
//read and output the file
while (readFile)
{
words = readFile.get();
if(words!= EOF)
cout <<words;
}
cout << "The size of the file is: " << words.length() << " bytes. \n";
return 0;
}
char c;
while (readFile.get(c))
{
words.insert(c);
}
Of course, if you were solely doing this to count the number of characters (and were intent on using std::istream::get) you'd probably be better off just doing this:
int NumChars = 0;
while (readFile.get())
{
NumChars++;
}
Oh, and by the way, you might want to close the file after you're done with it.
You should read some reference.. try cppreference.com and look for std::instream::get
I'm not sure what do you want, but if you wanna just count words, you can do something like this:
std::ifstream InFile(/*filename*/);
if(!InFile)
// file not found
std::string s;
int numWords = 0;
while(InFile >> s)
numWords++;
std::cout << numWords;
Or if you want to get to know how many characters are in file, change std::string s to char s and use std::ifstream::get instead:
std::ifstream InFile(/*filename*/);
if(!InFile)
// file not found
char s;
int numCharacters = 0;
while(InFile.get(s)) //this will read one character after another until EOF
numCharacters++;
std::cout << numCharacters;
The second approach is easier:
If file uses ASCII, numCharacters == fileSize;
Otherwise if it uses UNICODE, numCharacters == fileSize / 2;
get() returns an int, to do what you're doing, you must check that int before appending to "words" instead of checking words against EOF, e.g.:
...
//read and output the file
while (readFile)
{
const int w = readFile.get();
if (w!= EOF) {
words += w;
cout <<words;
}
}
...
This snippet is part of a big program. The problem I am facing is that when I write a string to the file using "write" member function, it do not show last character of string:
#include <iostream>
#include <cstring>
#include <string>
#include <cctype>
#include <fstream>
#include <cstring>
using namespace std;
int main()
{
fstream file1("/users/xxxxxxx/desktop/file1.txt", ios::out);
string data;
cout << "Enter string: " << endl;
getline(cin, data);
file1.write(reinterpret_cast<char*>(&data), data.size());
//file1 << data;
file1.close();
return 0;
}
For Example: If Input String: "Hello World".
On File it will show: "Hello Worl",
But it does work fine if I input string using "file1 << data". Please help me in this
file1.write(reinterpret_cast<char*>(&data), data.size());
Don't do this, you are writing the string object itself to the file. if you really want to use write you have to get a pointer to the first char that the string holds, like this:
file1.write(data.data(), data.size());
Just use the << operator.
Why would you cast the address of a string into a char*? This isn't a meaningful conversion--you are casting a std::basic_string<char>* to char*. I suspect you want to treat string as char* since write accepts const char* as parameter. You can access the character sequence stored in your data by doing data.c_str().
I just want to read a txt file and receive a string file like that
Blob rgbBlob;
string strIccRGBFile = "./icc/RGB.icc";
string strIccRGBContent = LoadFile(strIccRGBFile);
rgbBlob.update(strIccRGBContent.c_str(), strIccRGBContent.length());
image.profile("ICM", rgbBlob);
How I implement LoadFile function
#include <fstream>
#include <string>
int main()
{
std::string buff;
std::fstream fs("filename",std::ios::in | std::ios::ate)
if(fs.is_open())
{
fstream::pos_type size = fs.tellg();
fs.seekg(0);
buff.resize(size);
fs.read(&buff[0],size);
}
std::cout << buff << endl;
}
this is an example of how to read a file in it's entirety to a string buffer. It should give you a good idea on how to proceed.
This is a very strange issue. I'm trying to print a large text file, it's a Wikipedia entry. It happens to be the page on Velocity. So, when I tell it to print the file, it prints "In", when it should print "In physics, velocity is etc, etc etc".
Here's the code I'm using to print out:
#include <iostream>
#include <fstream>
using namespace std;
int main()
{
ifstream wiki;
wiki.open("./wiki/velocity.txt");
char* wikiRead;
wiki >> wikiRead;
cout << wikiRead << endl;
wiki.close();
}
Please help.
wiki >> wikiRead;
The default delimiter for stream is space, so when the stream encounters a space, it simply stops reading, that is why it reads only one word.
If you want the stream to read all words, the you've to use a loop as:
char* wikiRead = new char[1024]; //must allocate some memory!
while(wiki >> wikiRead)
{
cout << wikiRead << endl;
}
wiki.close();
delete []wikiRead; //must deallocate the memory
This will print all the words in the file, each on a new line. Note if any of the word in the file is more than 1024 character long, then this program would invoke undefined behavior, and the program might crash. In that case, you've to allocate a bigger chunk of memory.
But why use char* in the first place? In C++, you've better choice: Use std::string.
#include<string>
std::string word;
while(wiki >> word)
{
cout << word << endl;
}
wiki.close();
Its better now.
If you want to read line-by-line, instead of word-by-word, then use std::getline as:
std::string line;
while(std::getline(wiki, line))
{
cout << line << endl;
}
wiki.close();
This will read a complete line, even if the line contains spaces between the words, and will print each line a newline.
You ask the stream to read the (binary) value of a pointer (probably 4 bytes, depending on your machine architecture), then you ask it to print the text pointed to by those 4 bytes!
I wonder why you ignored the compiler warning (most of the modern compiler warns you about using uninitialized variables). How about this?
ifstream wiki;
wiki.open("./wiki/velocity.txt");
char wikiRead[255];
wiki >> wikiRead;
cout << wikiRead << endl;
wiki.close();
Alternatively I'd suggest you to use string object with getline to get a single line of text.
string str;
getline(wiki, str);
The >> operator applied to a char * reads only one word. Moreover, you're reading into an uninitialized pointer, which is not valid. Usually std::string, not char *, is used for string processing in C++.
If you only want to print the file's contents, you can hook the file's buffer directly to std::cout:
int main() {
std::ifstream wiki("./wiki/velocity.txt");
std::cout << wiki.rdbuf() << '\n';
}
If you want to put the contents into an automatically-allocated string, use std::getline with the delimiter disabled.
int main() {
std::ifstream wiki("./wiki/velocity.txt");
std::string wiki_contents;
getline( wiki, wiki_contents, '\0' /* do not stop at newline */ );
std::cout << wiki_contents << '\n'; // do something with the string
}
Since you want to read a large file, reading it block by block is a better way.
ifstream wiki;
wiki.open("./wiki/velocity.txt");
const int buf_size = 1024;
char* wikiRead = 0;
int cnt = 1;
do
{
wikiRead = realloc( wikiRead, bufsize*cnt );
wiki.Read( wikiRead + (bufSize*(cnt-1)), buf_size ); //appends to reallocated memory
cnt++;
}while( !wiki.eof())
wikiRead[(bufSize*(cnt-2)) + wiki.gcount() + 1] = '\0'; // null termination.
wiki.Close();
cout << wikiRead;
delete[] wikiRead;
The operator>> is designed to only read one word at a time. If you want to read lines, use getline.
#include <iostream>
#include <fstream>
#include<string>
using namespace std;
int main()
{
ifstream wiki;
wiki.open("./wiki/velocity.txt");
string wikiRead;
while (getline(wiki, wikiRead))
{
cout << wikiRead << endl;
}
wiki.close();
}