Thread: How to read a binary file in 2d array?

Hi, I have 2 big binary files that I need to read in a 2d array. So far I have been able to read the first file in buffer array and though I have tried to read the second file in another buffer array it is displaying all 0 values. I do not have much experience in C programming, so any help would be highly appreciated. The code i have written so far is as follows:

insert

Code:

#include<stdio.h>
#include<stdlib.h>


int main()
{
FILE *fileptr1, *fileptr2;
int *buffer1, *buffer2;
long filelen1, filelen2;


//Opening and reading data file en.dat
fileptr1 = fopen("C:\\Users\\ABC\\Desktop\\en.dat", "rb"); // Open the file in binary mode
if(!fileptr1)
{
printf("Unable to open file");
return 1;
}
fseek(fileptr1, 0, SEEK_END); // Jump to the end of the file
filelen1 = ftell(fileptr1); // Get the current byte offset in the file
printf("\nFile length for file EN.dat that is loaded is %d\n\n", filelen1);
rewind(fileptr1); // Jump back to the beginning of the file


buffer1 = (int *)malloc((filelen1+1)*sizeof(int)); // Enough memory for file + \0
fread(buffer1, filelen1, 1, fileptr1); // Read in the entire file
for(int i=0; i<10 ; i++)
{
printf("\n %d = %d", i, buffer1[i]);
}


//Opening and reading xyz.dat
fileptr2 = fopen("C:\\Users\\ABC\\Desktop\\xyz.dat", "rb"); // Open the file in binary mode
if(!fileptr2)
{
printf("Unable to open file");
return 1;
}
fseek(fileptr2, 0, SEEK_END); // Jump to the end of the file
filelen2 = ftell(fileptr2); // Get the current byte offset in the file
printf("\n\n\nFile length for File XYZ.dat that is loaded is %d\n\n", filelen2);
rewind(fileptr2); // Jump back to the beginning of the file


buffer2 = (int *)malloc((filelen2+1)*sizeof(int)); // Enough memory for file + \0
fread(buffer1, filelen2, 1, fileptr2); // Read in the entire file
for(int i=0; i<50 ; i++)
{
printf("\n %d = %d", i, buffer2[i]);
}

//Closing mien.dat and mxyz.dat
fclose(fileptr1); // Close the file
fclose(fileptr2);
}

I am getting correct file lengths but for the second files when I print values i am getting all zeroes.
And how can i load these files into a 2d array?

Hi..Please ignore that comment line...i used google to help me with this code. That part if you see has been commented by use of "//"

I do not have any problem handling a text file. I have a binary file with ".dat" extension as in shown in the code. The file was given to me by my teacher who explicitly mentioned it was in binary format.

Yes that was a mistake on my part, in line # 47 it is buffer 2 instead of buffer 1