I am using the array of pointers and storing the address of string.This is a global list.
So i am using extern to give the reference of this list to another file and using reading the data from this string.
But list is being corrupted and string is missing some characters in string. eg.
You are storing the string in the same buffer every time you fgets, overwriting anything previously read, and every pointer in your array just points to this same buffer. Without seeing the code it's only a guess, but is that buffer a local variable? It doesn't even exist except when the function it's in is being called, and at other times may be used for other memory, hence the further corruption. You need to store the data globally, not the pointer, so, a global array of strings:
Code:
#include <stdio.h>
extern char str_table[512][512];
int main(void)
{
int line=0;
while(fgets(str_table[line], 512, stdin) != NULL)
{
line++;
if(line >= 512)
{
fprintf(stderr, "Too many lines\n");
return(1);
}
}
}
Or if you wanted to just store pointers, you could use strdup:
Code:
#include <string.h>
#include <stdio.h>
extern char *str_table[512];
int main(void)
{
int line=0;
char buf[512];
while(fgets(buf, 512, stdin) != NULL)
{
str_table[line]=strdup(buf); // Create a persistent copy of the string in heap memory
line++;
if(line >= 512)
{
fprintf(stderr, "Too many lines\n");
return(1);
}
}
line--;
while(line >= 0)
{
free(str_table[line]); // Get rid of the persistent copies of strings
line--;
}
}
Last edited by Corona688; 01-06-2010 at 02:39 PM..
I am attempting to create an array of function pointers. The examples I follow to do this are from:
support.microsoft.com/en-us/help/30580/how-to-declare-an-array-of-pointers-to-functions-in-visual-c
... (3 Replies)
Hello, I read from a book exercise for a challenge. How to print out each letter of char array a by two different pointers pa and ppa in the example?
I have tried my code for letter "r" by testing without full understanding as only the first one worked.
#include<stdio.h>
int main()
{
char... (17 Replies)
Hello All,
I am having this issue...where I am actually having hard time understanding the problem:
The code is as follows:
#include<iostream.h>
void fxn(char*** var)
{
int i =4;
*var = (char**)malloc(i*sizeof(char*));
for(int j =0; j<4; j++)
{
*var = "name";
cout<<*var;... (6 Replies)
Please find the below program. the requirement and description of the program also given:
ganesh@ubuntu:~/my_programs/c/letusc/chap9$ cat fa.c.old
/* Program : write a program to count the number of 'e' in thefollowing array of pointers to strings:
char *s = {
"We will teach you how... (12 Replies)
I am using /bin/ksh for this problem.
I have created some arrays with variable names as the array names:
cnt=1
{ while read myline; do
tempmeas="${meas%%;*}"
cto="${meas#*;}"
tempstream=$stream
# wholemeas holds the name of the array
# each array name... (0 Replies)
Hello all,
I'm working on a small wrapper library for a bigger project, and i've been killing my self over (what I think is) a pointer problem.
Here is the code (I extracted the part of the code where the problem is for better reading, I tested the code below, and I get the same problem):... (13 Replies)
Dear Experts,
please help me out once again my array concepts is not very clear i have one text file like.
1|usa|hh
2|usa|ll
3|usa|vg
4|uk|nn
5|uk|bb
6|kuwait|mm
6|kuwait|jkj
7|dubai|hh
i want to store the third fied of a text file in he array and after that it should give me some... (6 Replies)
hi all,
let say i have a pointer exit, and this exit will store some value. how can i store the value that the pointer points to into an array and then print them out from the array.
thanks in advance (2 Replies)
01-06-2010
Problem with array of pointers