Thread: Binary FIle I/O

Code:

void create_customer()
{
        FILE *customer_fp;
        customer_indexed indexed_array[FILE_SIZE]; //255
        customer_record new_record;
        int i;
        
        customer_fp = fopen("test.bin", "wb");
                
        printf("Input customer first name: ");
        scanf("%s", new_record.first_name);
        printf("Input employee last name: ");
        scanf("%s", &new_record.last_name);
        fwrite(&new_record, sizeof(new_record), 1, customer_fp);
        fprintf(customer_fp, "\n");
        fclose(customer_fp);
}

I am trying to write this to a binary file. It wont be implemented using scanf later, its just to see if its working for now.

I have another file to read the binary file, but it will only allow me to add one entry. I am calling the function twice in main.

Any suggestions?

Thanks

Yes I do have fixed sizes for them.

I took out the \n, I thought that was why it wasnt putting the data into the file.

Still, nothing appears in the file.

Code:

        customer_record new_record;
        int i,j;
        FILE *fp;
                
        fp = fopen("test.bin" ,"rb");
        while(1 == fread(&new_record, sizeof(customer_record),1,fp))
                printf("%s %s\n" ,new_record.first_name, new_record.last_name);
                
        fclose(fp);

That is the printing of the binary file.

Thanks for the help.

I open the file with an editor instead of using the read function.

It seems like only the first scanf is inputed into the file.

>>open the file for appending with "a+"
Don't forget binary mode is also required.