06-27-2008
Problem with memcpy
Hi ,
I am having records in a file like
00412772784705041008FRUITFUL STRWBRRY
00412772784703041008FRUITFUL STRWBERE
00000570632801448078 X
i have declared a structure like
typedef struct {
char Uname[16];
char Pname[4];
char Sname[17];
} person;
I am using reading the file one line by line and i am doing memcpy to
store the line into the structure
memset(person,0,sizeof(person));
memcpy(person,line1,37) -- here line1 has the line from the file the above three lines i mentioned
The problem is that ,for 1 and 2 line i am getting the correct result , For third line it is storing
withthe space as well.
my Sname for line 3 contains
" X "
but it should be as
"X "
i used trim function on sname like trim(person.Sname). If i do this is is storing as a single character
as "X" ..
But i need the the 17 character string it should be as
"X "
any way can we do this ??..
Please help ..
Thanks in Advance,
Arun
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LEARN ABOUT DEBIAN
data::stag::hashdb
Data::Stag::HashDB(3pm) User Contributed Perl Documentation Data::Stag::HashDB(3pm)
NAME
Data::Stag::HashDB - build indexes over Stag files or objects
SYNOPSIS
# parsing a file into a hash
my $hdb = Data::Stag::HashDB->new;
$hdb->unique_key("ss_details/social_security_no");
$hdb->record_type("person");
my $obj = {};
$hdb->index_hash($obj);
Data::Stag->parse(-file=>$fn, -handler=>$hdb);
my $person = $obj->{'999-9999-9999'};
print $person->xml;
# indexing an existing stag tree into a hash
my $personset = Data::Stag->parse($fn);
my $hdb = Data::Stag::HashDB->new;
$hdb->unique_key("ss_details/social_security_no");
$hdb->record_type("person");
my $obj = {};
$hdb->index_hash($obj);
$personset->sax($hdb);
my $person = $obj->{'999-9999-9999'};
print $person->xml;
DESCRIPTION
Used for building indexes over Stag files or objects
You need to provide a record_type - this is the type of element that will be indexed
You need to provide a unique_key - this is a single value used to index the record_types
For example, if we have data in the stag structure below, and if ss_no is unique (we assume it is) then we can index all the people in the
database using the code above
publicinfo:
persondata:
person:
ss_details:
social_security_no:
name:
address:
There is a subclass of this method callsed Data::Stag::StagDB, which makes the hash persistent
PUBLIC METHODS -
record_type
Usage -
Returns -
Args -
unique_key
Usage -
Returns -
Args -
index_hash
Usage -
Returns -
Args -
perl v5.10.0 2008-12-23 Data::Stag::HashDB(3pm)