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Full Discussion: Reading from a binary file
Top Forums Programming Reading from a binary file Post 20178 by primal on Monday 22nd of April 2002 06:10:26 PM
Old 04-22-2002
Question Reading from a binary file
I'm having trouble with reading information back into a program from a binary file. when i try to display the contents of the file i get a Memory fault(coredump). would anyone be able to assist?
this is my fread line
Code:
fread(&file_data,sizeof(struct book_type),1,fileSave);

ive also tried it without the & but i still get the coredump.
thanks!
primal

here is some other information that might be required...
global variable
Code:
struct book_type{
    char title[30];
    float price;
    char authorName[30];
    struct book_type * link;
   };

saving to file
Code:
fwrite(book_head,sizeof(struct book_type),1,fileSave);
fwrite(temp,sizeof(struct book_type),1,fileSave);

function definition
Code:
void display_File_Data(){
     char ch;
     int count=1;
     struct book_type * file_data;
     rewind(fileSave);
     printf("\nSerial Number\tTitle\t\tAuthor\t\tPrice\n");
     do{
        fread(&file_data,sizeof(struct book_type),1,fileSave);
          if(feof(fileSave)){
             break;
            }
          else{
             printf("%d\t\t%s\t%s\t$%2.2f\n",count,file_data->title,file_data->authorName,file_data->price);
             count++;
            }
       }while(!feof(fileSave));
     printf("\nPress enter to continue...");
     ch=getchar();
     getchar();
    }

 

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LEARN ABOUT MINIX

systemd-sysctl.service

SYSTEMD-SYSCTL.SERVICE(8)				      systemd-sysctl.service					 SYSTEMD-SYSCTL.SERVICE(8)

NAME

       systemd-sysctl.service, systemd-sysctl - Configure kernel parameters at boot

SYNOPSIS

       /lib/systemd/systemd-sysctl [OPTIONS...] [CONFIGFILE...]

       systemd-sysctl.service

DESCRIPTION

       systemd-sysctl.service is an early boot service that configures sysctl(8) kernel parameters by invoking /lib/systemd/systemd-sysctl.

       When invoked with no arguments, /lib/systemd/systemd-sysctl applies all directives from configuration files listed in sysctl.d(5). If one
       or more filenames are passed on the command line, only the directives in these files are applied.

       In addition, --prefix= option may be used to limit which sysctl settings are applied.

       See sysctl.d(5) for information about the configuration of sysctl settings. After sysctl configuration is changed on disk, it must be
       written to the files in /proc/sys before it takes effect. It is possible to update specific settings, or simply to reload all
       configuration, see Examples below.

OPTIONS

       --prefix=
	   Only apply rules with the specified prefix.

       -h, --help
	   Print a short help text and exit.

       --version
	   Print a short version string and exit.

EXAMPLES

       Example 1. Reset all sysctl settings

	   systemctl restart systemd-sysctl

       Example 2. View coredump handler configuration

	   # sysctl kernel.core_pattern
	   kernel.core_pattern = |/libexec/abrt-hook-ccpp %s %c %p %u %g %t %P %I

       Example 3. Update coredump handler configuration

	   # /lib/systemd/systemd-sysctl --prefix kernel.core_pattern

       This searches all the directories listed in sysctl.d(5) for configuration files and writes /proc/sys/kernel/core_pattern.

       Example 4. Update coredump handler configuration according to a specific file

	   # /lib/systemd/systemd-sysctl 50-coredump.conf

       This applies all the settings found in 50-coredump.conf. Either /etc/sysctl.d/50-coredump.conf, or /run/sysctl.d/50-coredump.conf, or
       /usr/lib/sysctl.d/50-coredump.conf will be used, in the order of preference.

       See sysctl(8) for various ways to directly apply sysctl settings.

SEE ALSO

       systemd(1), sysctl.d(5), sysctl(8),

systemd 237														 SYSTEMD-SYSCTL.SERVICE(8)
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