Thread: How to ...read in a hex value and display

I'm trying to read in a hex value and display that value....any thoughts on how I can modify the following code.
Thanks in advance

File layout .................................................. ......

..í^...........
005B00000000000
005000000000000
--------------
..êY...........
005E00000000000
002800000000000
--------------
..<............
004200000000000
.................................................. ...........................

Code .................................................. .........................

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <IO.h>
main(void)
{
FILE *input;
char *buffer_input;
int hex;
buffer_input = malloc(50000);
/************************************************** *****/
/* open input file */
/************************************************** *****/
if (buffer_input < 1)
printf("buff alloc failed\n");
if ((input = fopen("DD:IN","rb")) == NULL)
{
printf("open of IN DD failed\n");
exit(-1);
}
else
{
printf("Successful open\n");
}
/************************************************** *****/
/* perform first read into buffer */
/************************************************** *****/
while (!feof(input))
{
fread(buffer_input,sizeof(int),80,input);
strncpy(&hex,buffer_input + 1,8);
printf("\nhex = %x\n", hex);
}
}

Thanks Swoopy

I was able to display the hex values !

My next step, I will try to incorporate this logic when reading a file with different data types.

Example

pos 1-10 = router
pos 11-29 = account
pos 30 - 38 = serial
pos 39 -45 = amount This will be a hex value

What I want to be able to do is ...... read 45 bytes into a buffer.
Then display the rt , account and serial..........then display the hex value via your code.
Any thoughts on "multiple data type processing" would be greatly appreciated. In the meantime, I have enough information to keep me busy.

Again Thanks ......

Swoopy...I was just speaking with someone concerning my last post.
I guess what I'm really trying to do is......

Read ...say the first 200 characters into a buffer.
Within that buffer, is displayable values via a sting copy(I use string copy to isolate individual fields.

Also embedded within that buffer is a hex value.
When I writer the buffer to a file...it stops at the hex value ???

****Anyway, can I code to display that hex value thats embedded within a char buffer******.

I also "eventually" would like to write to a file along with the other data.

Thanks MMC

MMC,
I believe something close to your original code will work well, i.e. use a character buffer to read in the file. And then, as you said, the strcpy() type functions can isolate the fields.

Code:

#include <stdio.h>
#include <stdlib.h> 
#include <string.h>
const int buffer_size = 200;
int main(void)
{ 
FILE *input; 
char *buffer_input;
int i, items;
buffer_input = malloc(buffer_size);
/*************************************************/
/* open input file */ 
/*************************************************/
if (buffer_input == NULL)
printf("buff alloc failed\n");
if ((input = fopen("DD:IN","rb")) == NULL)
{
printf("open of IN DD failed\n"); 
exit(-1); 
} 
else 
{ 
printf("Successful open\n"); 
} 
/*************************************************/
/* perform first read into buffer */ 
/*************************************************/
while (items =  fread(buffer_input,1,buffer_size,input))
{
   for (i=0; i<items; i++)
      printf("\nhex = %x\n",buffer_input[i]);
}
free(buffer_input);
return 0;
}

One note on your strncpy().

strncpy(&hex,buffer_input + 1,8);

Unless an int is 8 bytes on your machine, this 8 should be changed to the size of an int (or use sizeof(int)).