I have a file stream open and ready.
How do I access and change a single Byte in the stream such that the change is reflected on the file?
Any suggestions?
#include "stdio.h"
int main(void)
{
FILE* f = fopen("so-data.dat", "r+b"); // Error checking omitted
fseek(f, 5, SEEK_SET);
fwrite("x", 1, 1, f);
fclose(f);
}
FILE* fileHandle = fopen("filename", "r+b"); // r+ if you need char mode
fseek(fileHandle, position_of_byte, SEEK_SET);
fwrite("R" /* the value to replace with */, 1, 1, fileHandle);
#include <stdio.h> /* standard header, use the angle brackets */
int main(void)
{
char somechar = 'x'; /* one-byte data */
FILE* fp = fopen("so-data.txt", "r+");
if (fp) {
fseek(fp, 5, SEEK_SET);
fwrite(&somechar, 1, 1, fp);
fclose(fp);
}
return 0; /* if you are on non-C99 systems */
}
Related
#include <stdio.h>
#include <stdlib.h>
int count_arr(FILE *file)
{
int c,count=0;
//FILE *file;
//file = fopen("test.txt", "r");
if (file) {
while ((c = getc(file)) != EOF){
putchar(c);
++count;}
fclose(file);
}
return count;
}
void make_arr (FILE *file, char arr[]){
int c,n=0,count=0;
char ch;
//FILE *file;
//file = fopen("test.txt", "r");
if (file) {
while ((c = getc(file)) != EOF){
ch = (char)c;
arr[n]=ch;
++n; }
fclose(file);
}
}
int main(){
FILE *file;
int n;
//scanf("%c",&file_name);
file = fopen("test.txt","r");
int count = count_arr(file);
char arr [count];
make_arr(file, arr);
for(n=0; n<count;++n) printf("%c",arr[n]);
}
So far this is all I have for my code. I know I am doing it completely wrong. When I print out the char array it prints random junk... I am trying to code a function "make_arr" that passes an array which gets stored with characters from a file. Any help would be appreciated!
Here is an small example that reads a file into a buffer:
FILE* file = fopen("file.txt", "r");
// get filesize
fseek(file, 0, SEEK_END);
int fsize = ftell(file);
fseek(file, 0, SEEK_SET);
// allocate buffer **note** that if you like
// to use the buffer as a c-string then you must also
// allocate space for the terminating null character
char* buffer = malloc(fsize);
// read the file into buffer
fread(buffer, fsize, 1, file);
// close the file
fclose(file);
// output data here
for(int i = 0; i < fsize; i++) {
printf("%c", buffer[i]);
}
// free your buffer
free(buffer);
If you really would like to use a function to fill your buffer this would work (not really see the point though), although I still will make only one read operation:
void make_array(FILE* file, char* array, int size) {
// read entire file into array
fread(array, size, 1, file);
}
int main(int argc,char** argv) {
// open file and get file size by first
// moving the filepointer to the end of the file
// and then using ftell() to tell its position ie the filesize
// then move the filepointer back to the beginning of the file
FILE* file = fopen("test.txt", "r");
fseek(file, 0, SEEK_END);
int fs = ftell(file);
fseek(file, 0, SEEK_SET);
char array[fs];
// fill array with content from file
make_array(file, array, fs);
// close file handle
fclose(file);
// output contents of array
for(int i = 0; i < fs; i++) {
printf("%c\n", array[i]);
}
return 0;
}
Like I stated in the comments above you need to add space for the terminating null character if you like to use the char array as a string:
char* array = malloc(fs + 1);
fread(array, fs, 1, file);
// add terminating null character
array[fs] = '\0';
// print the string
printf("%s\n", array);
I tried cyclically read file in buffer of 100 byte.
When i read file first time - buffer was full. Returned value is 0. No error and no eof (functions "ferror" and "feof" shows no error). Then i tried read file second time and again returned value is 0, no error and no eof. But then i have empty buffer. I don't know what is the problem?
if(fopen_s(&file_in, argv[1], "rb") == 0){
printf("File was opened.\n");
while(!feof(file_in)){
read_code = fread_s(file_data, 100, sizeof(unsigned char), 100, file_in);
if(ferror(file_in)) {
printf("Error!\n");
}
if(feof(file_in)) {
printf("Eof!\n");
}
printf("Read result: %d\n", read_code);
/*Using the buffer*/
memset(file_data, 0, 100);
}
fclose(file_in);
}
For the reasons given in comments regarding fopen_s, et. al., Here is an alternative implementation of reading a binary file using getc(), along with fopen(), fclose(), etc. (I am not using a Microsoft implementation, but am using ANSI C99)
It has a commented section I used to create a test binary file. Other than that it sizes the file you are reading so you can allocate the right amount of memory, then reads the binary data into a buffer.
For navigating your file, take a look at fseek() with its stdio.h defined arguments:
#define SEEK_SET 0
#define SEEK_CUR 1
#define SEEK_END 2
In this example, everything is closed or freed before exiting:
#include <windows.h>
#include <ansi_c.h>
long int getFileSizeFromPath(char * path)
{
FILE * file;
long int fileSizeBytes = 0;
file = fopen(path,"r");
if(file){
fseek(file, 0, SEEK_END);
fileSizeBytes = ftell(file);
fseek(file, 0, SEEK_SET);
fclose(file);
}
return fileSizeBytes;
}
int main(int argc, char *argv[])
{
FILE *fp=0;
char *binBuf;
long int size=0;
int i=0;
int byte=0;
//create 100 byte test file (c:\\dev\\tessst.bin)
// fp = fopen(argv[1], "wb");
//
// srand(clock());
// for(i=0;i<100;i++)
// {
// byte = rand();
// putc(byte, fp);
// }
// putc(EOF, fp);
//
// fclose(fp);
size = getFileSizeFromPath(argv[1]);
binBuf = calloc(size + 1, sizeof(char));
fp = fopen(argv[1], "rb");
byte = getc(fp);
while(byte != EOF)
{
binBuf[i++] = (char)byte;
byte = getc(fp);
}
fclose(fp);
free(binBuf);
return 0;
}
I am reading a text file and trying to display its contents on the console. Here is my code:
#include "stdafx.h"
#include <stdio.h>
#include <string.h>
#include <fstream>
int main()
{
FILE* fp=NULL;
char buff[100];
fp=fopen("myfile.txt","r");
if(fp==NULL)
{
printf("Couldn't Open the File!!!\n");
}
fseek(fp, 0, SEEK_END);
size_t file_size = ftell(fp);
fread(buff,file_size,1,fp);
printf("Data Read [%s]",buff);
fclose(fp);
return 0;
}
but only redundant data is being displayed on the console; could someone please point out my mistake?
You forgot to reset the file pointer to start after doing this.
fseek(fp, 0, SEEK_END);
Do this after finding size (file_size).
rewind (fp);
You need to seek back to the start of the file before reading:
int main()
{
FILE* fp=NULL;
char buff[100];
fp=fopen("myfile.txt","r");
if(fp==NULL)
{
printf("Couldn't Open the File!!!\n");
exit(1); // <<< handle fopen failure
}
fseek(fp, 0, SEEK_END);
size_t file_size = ftell(fp);
fseek(fp, 0, SEEK_SET); // <<< seek to start of file
fread(buff,file_size,1,fp);
printf("Data Read [%s]",buff);
fclose(fp);
return 0;
}
Try it....
#include <stdio.h>
#include <stdlib.h>
void handle_line(char *line) {
printf("%s", line);
}
int main(int argc, char *argv[]) {
int size = 1024, pos;
int c;
char *buffer = (char *)malloc(size);
FILE *f = fopen("myfile.txt", "r");
if(f) {
do { // read all lines in file
pos = 0;
do{ // read one line
c = fgetc(f);
if(c != EOF) buffer[pos++] = (char)c;
if(pos >= size - 1) { // increase buffer length - leave room for 0
size *=2;
buffer = (char*)realloc(buffer, size);
}
}while(c != EOF && c != '\n');
buffer[pos] = 0;
// line is now in buffer
handle_line(buffer);
} while(c != EOF);
fclose(f);
}
free(buffer);
return 0;
}
#include "stdafx.h"
#include <stdio.h>
#include <string.h>
#include <fstream>
int main()
{
FILE* fp=NULL;
char *buff; //change array to pointer
fp=fopen("myfile.txt","r");
if(fp==NULL)
{
printf("Couldn't Open the File!!!\n");
}
fseek(fp, 0, SEEK_END);
size_t file_size = ftell(fp);
buff = malloc(file_size); //allocating memory needed for reading file data
fseek(fp,0,SEEK_SET); //changing fp to point start of file data
fread(buff,file_size,1,fp);
printf("Data Read [%s]",buff);
fclose(fp);
return 0;
}
having a buffer of 100 bytes to read a file is not a better idea as since the file size may be more than 100 bytes.
A better file io can be done by doing a fgets on the file, if its not a type of metadata that you wanted to read using the fread.
fgets in a while loop can be used to check whether its reached EOF or a feof call can be used to check the EOF.
a sample code listing of fgets can be like this:
while (fgets(buf, len, fp)) {
printf("%s", buf);
}
or a sample that is used with fgets can be like this:
while (fread(buf, len, 1, fp) >= 0) {
printf("%s\n", buf);
}
I can seem to only read file into memory if I explicitly declare the buffer size. This works
#include <stdio.h>
int main(){
FILE *fp = fopen("test.log", "rb");
char buffer[37];
fread(buffer, 1, 36, fp);
printf("%s", buffer);
}
This will add junk to the output
#include <stdio.h>
int main(){
FILE *fp = fopen("test.log", "rb");
fseek(fp, 0, SEEK_END);
long siz = ftell(fp);
rewind(fp);
char buffer[siz + 1];
fread(buffer, 1, siz, fp);
printf("%s", buffer);
}
insert buffer[siz]='\0'; before printf("%s", buffer);
Try a different approach - use a "memory map". What it does is it allows you to access the file as if it was a memory block. This can dramatically improve performance while simplifying your code at the same time.
Read more about it at http://en.wikipedia.org/wiki/Mmap
I'd like to make copy of my binary file, but I need to make it from hex representation of my binary file.
In the first program I create txt file with with hex representation of my binary file:
#include <stdio.h>
#include <stdlib.h>
const int BYTE = 1;
int counter = 0;
int read;
long size;
FILE *file1 = NULL;
FILE *file2 = NULL;
fpos_t length;
int main() {
unsigned char hex[3];
unsigned char buffer[1];
file1 = fopen("server.pdf", "rb");
fseek(file1, 0, SEEK_END);
fgetpos(file1, &length);
size = length.__pos;
fseek(file1, 0, SEEK_SET);
if (file1) {
file2 = fopen("test.txt", "w");
while (counter < size) {
read = fread(buffer, 1, BYTE, file1);
counter += read;
i = 0;
while(i<read) {
sprintf(hex, "%02x", (unsigned int) buffer[i++]);
fwrite(hex, 1, BYTE, file2);
}
}
} else
printf("ERROR");
fclose(file1);
fclose(file2);
}
In the second, I read data from txt file and after that I write it to binary file:
#include <stdio.h>
FILE *file1;
FILE *file2;
int size;
fpos_t length;
int main(){
file1 = fopen("test.txt", "r");
fseek(file1, 0, SEEK_END);
fgetpos(file1, &length);
size = length.__pos;
fseek(file1, 0, SEEK_SET);
char buffer[1];
char hex[3];
int counter = 0;
int read;
if(file1){
file2 = fopen("test.pdf", "wb");
while (counter < size) {
read = fread(hex, 1, 3, file1);
counter += read;
sscanf(hex, "%02x", buffer);
fwrite(buffer, 1, 1, file2);
}
}
fclose(file1);
fclose(file2);
}
Unfortunately I can't open my copy. What is the reason?
Have you looked at the files content? You wont be able to sprintf the hex representation to the variable hex since it's 1 byte in size.
The variable hex is declared hex[BYTE] where BYTE = 1, but your sprintf format string looks like this: "%02x" ie 2 bytes, then you need room for a terminating zero.
The same goes for when you write to the file, you only write 1 byte from your hex string.
Declaring a variable as: var[1] is pointless you can achieve the same thing with var btw.
Besides this you should also add proper error handling, if you can not successfully open the file. This means checking the file pointer after your call to fopen, then take an appropriate action. perror() will print an error string that corresponds to errno, and in case of a file that does not exist it will print something like: "no such file or directory" or similar.
When you said you can't open your copy, you mean you have an error in fopen("test.txt", "r")? Did you check errno value? Check perror() and strerror().
Besides, you have no loop in second program.