Reading a file one char at a time

c read one character at a time from file
c read text file character by character
read file in c line by line
c get next character from file
read next char c
while fgetc
ifstream read one character

I have two .c files: one contains the main and the other contains all of my functions.

In my main I have a part where I want to read a char at a time the loop looks like this:

while(ch = ReadFile(fp)) != EOF)
    // Code

where ch is an integer (int ch;) and fp is a file pointer (FILE* fp;).

And (different .c file ---):

int ReadFile(FILE* fp)
    // Some code
    return n; // The next char

Does anyone know how I can read one char at a time from the main this way, using this method?


The famous getc from <stdio.h> is a solution:-

while((ch = getc(fp)) != EOF)
int ReadFile(FILE* fp)
   //Do what you wish... :)
  return getc(fp); 

Declared as int getc( FILE * _File);

Reading a file one char at a time, Or, give up on line mode and read the file a character at a time. Example 3-3. /** CheckSum one file, given an open BufferedReader. */ public​  How do I read one character at a time under Linux / UNIX bash shell script? The read builtin can read one character at a time and syntax is as follows: ADVERTISEMENTS

try this:

int ReadFile(FILE* fp, int *buffer)
    if(fp != NULL)
        *buffer = fgetc(fp);
        return *buffer;
    else return NULL;

Processing a String One Character at a Time, 2.4 Reading a File One Character at a Time Occasionally, it is useful to read a file one character at a time and this section describes how to do that. In VBA, what is the best way to read a text file, one character at a time? Can I use the "=" operator to compare the character read with another character? [If strVar = "E" then ] In C you can't use the "=" to compare strings. How does VBA handle the end of line? Are there any characters between the last text character and EOF? Thank you.


while(ch != EOF)
    ch = fgetc(fp);
    //process ch

Keep in mind that fgetc is declared as an int.

Or if you wanted to build a string char by char you could read the file char by char to dynamically allocated memory like so (assuming fp is open for reading):

char *data = NULL, *tmp;
int ch, bff = 0;

while(ch != EOF)
    if(!(tmp = realloc(data, bff + 2)))
        return 1;
    data = tmp;
    ch = fgetc(fp);   //or your readfile function assuming it works the same as fgetc
    data[bff++] = ch;
data[bff] = '\0';

just free(data) when you are done with it

C Programming: The Essentials for Engineers and Scientists, I want to read from a text file and output single characters to an external device. I can access the file, read the whole string, and output the whole  I want to read from a text file and output single characters to an external device. I can access the file, read the whole string, and output the whole string to the device. But I really need to do it character at a time in a wee loop. Here's the code I have so far;-----

Reading Character at a time from a text file, The file pointer must be valid, and must point to a file successfully opened by Returns a string containing a single character read from the file pointed to by If you call fgetc(HANDLE) multiple times you must clear buffer before, thus get all  I want my program to read a text file all characters 1 by 1 and whereever it finds inverted comma ( " ), it adds a semicolon before that inverted comma. For eg we have a paragraph in a text file as

fgetc - Manual, fgetc() is used to obtain input from a file single character at a time. This function returns the number of characters read by the function. It returns the character  You can use the comma operator to create a loop which behaves like a for each loop which goes through the entire file reads every character one by one and stop when it's done. char c; while((file.get(c), file.eof()) == false) { /*Your switch statement with c*/ }

fgetc() and fputc() in C, The Java FileReader is a useful tool for reading text files, property files, Second​, this example reads all characters one char at a time from the  @vkeles: 1) Allocate an array with some initial size, say n using malloc 2) Read chars into the array until the it doesn't exceed n 3) If n chars are read and you want to read more than double the size of the array using realloc. This method is generally followed to avoid calling realloc too frequently.