Read and write binary

The ANZAC

Can anyone help me, or at least point me to some good sites that will help with reading and writing binary files on the fly without using an array?

Please check out my articles: The ANZAC's articles

David Crow

Binary files and arrays have nothing to do with the other.

"Love people and use things, not love things and use people." - Unknown

"The brick walls are there for a reason...to stop the people who don't want it badly enough." - Randy Pausch

The ANZAC

Ok then, well that only answered part of my question. How do i read and write a binary file, what are some keywords i should be looking up?

Please check out my articles: The ANZAC's articles

sashoalm

you can use fopen, fread, fwrite, and finally fclose. google for those functions.

There is sufficient light for those who desire to see, and there is sufficient darkness for those of a contrary disposition. Blaise Pascal

David Crow

That all depends on what you are using to open/create the file. Some possibilities include:

// C
fopen()
CreateFile()

// MFC
CFile

// C++
ofstream

Each of these has their own way of opening/creating a binary file.

"Love people and use things, not love things and use people." - Unknown

"The brick walls are there for a reason...to stop the people who don't want it badly enough." - Randy Pausch

enhzflep

With fopen, fread and fwrite. Here's a rough n nasty example:

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

int main()
{
FILE *fp;
long i;
long fLen;
long tmpValue;

// try to open an existing file
fp = fopen("test.dat", "r+b");
// if failed, then create a file
if (fp == NULL)
{
    printf("File doesn't exist\\n");
    printf("creating...\\n");
    fp = fopen("test.dat", "w+b");
}
// if file opened/created ok continue
if (fp)
    printf("File opened successfully.\\n");
// otherwise, nick-off
else
    return -1;

// write some binary data to the file
for (i=0; i<100; i++)
    fwrite(&i, sizeof(i), 1, fp);

// get length of file
fseek(fp, 0, SEEK\_END);
fLen = ftell(fp);

// return file pointer to beginning of file
fseek(fp, 0, SEEK\_SET);

// loop through, reading 1 long at a time from the file and printing it's value
for (i=0; i<fLen/sizeof(long); i++)
{
    fread(&tmpValue, sizeof(long), 1, fp);
    printf("%4d", tmpValue);
}

fclose(fp);
return 0;

}

The ANZAC

Thanks, this looks quite helpful, i will get to work on this :)

Please check out my articles: The ANZAC's articles