Hi,
I have checked some more on
this and it seems there is one more character remaining after three objects
has been read (0xa) and that is why eof() is not returning true. Can someone
please let me know if they come across this problem or tell me what I am
doing incorrect here? Thanks.
// File data that is being read
$ cat filename
22 serialization::archive 4 0 0 35 59 24.566999 14
Monday_Pointer 45 69 34.567001 15 Tuesday_Pointer 1 2 3.3 13
WEDNESDAY_PTR
// Y_PTR = Y= 59 _ = 5f,
P = 50, T = 54, R = 52
// 5f59 5450
0a52
$ od -x
filename
0000000 3232 7320 7265 6169
696c 617a 6974 6e6f
0000020 3a3a 7261 6863 7669
2065 2034 2030 2030
0000040 3533 3520 2039 3432
352e 3636 3939 2039
0000060 3431 4d20 6e6f 6164
5f79 6f50 6e69 6574
0000100 2072 3534 3620 2039
3433 352e 3736 3030
0000120 2031 3531 5420 6575
6473 7961 505f 696f
0000140 746e 7265 3120 3220
3320 332e 3120 2033
0000160 4557 4e44 5345 4144
5f59 5450 0a52
0000176
Follows is updated
program:
while (!ifs.eof())
{
std::cout << "BAD: " << (ifs.rdstate() & std::ios::badbit)
<< "FAIL:" << (ifs.rdstate() & std::ios::failbit)
<< "GOOD: " << (ifs.rdstate() & std::ios::goodbit)
<< "EOF: " << (ifs.rdstate() & std::ios::eofbit)
<< std::endl;
std::cout << " ++++++++++++++++ " <<
std::endl;
if (counter == 3) {
while (!ifs.eof()) {
std::cout << ifs.get() << std::endl;
}
std::cout << "BAD: " << (ifs.rdstate() & std::ios::badbit)
<< "FAIL:" << (ifs.rdstate() & std::ios::failbit)
<< "GOOD: " << (ifs.rdstate() & std::ios::goodbit)
<< "EOF: " << (ifs.rdstate() & std::ios::eofbit)
<< std::endl;
break;
}
++counter;
ia >> g;
std::cout << g.degrees << " : "
<< g.minutes << " : "
<< g.seconds << " : "
<< g.day
<<std::endl;
std::cout << " **************** " <<
std::endl;
}
ppatel@cinderella
[~/MY_TEST/BOOST] $ ./boost_serialize BAD: 0FAIL:0GOOD: 0EOF:
0
++++++++++++++++
35 : 59 : 24.567 :
Monday_Pointer
****************
BAD: 0FAIL:0GOOD: 0EOF:
0
++++++++++++++++
45 : 69 : 34.567 :
Tuesday_Pointer
****************
BAD: 0FAIL:0GOOD: 0EOF:
0
++++++++++++++++
1 : 2 : 3.3 :
WEDNESDAY_PTR
****************
BAD: 0FAIL:0GOOD: 0EOF:
0
++++++++++++++++
10
-1
Thanks
Priyank
From: Priyank Patel
Sent: Wednesday, February 11, 2009 3:19 PM
To:
'Boost-users@lists.boost.org'
Subject: boost::serialize stream
error
Hi all,
I am having following problem while reading the data out of
the file using one of the sample program provided in boost serialization
example online. I am trying to read the file having multiple gps_position
objects but getting following exception. Can someone please let me know what
might be the problem here. Let me know if you need any more information:
#include <fstream>
#include <string>
// include headers that implement a archive in simple text
format
#include
<boost/archive/text_oarchive.hpp>
#include
<boost/archive/text_iarchive.hpp>
#include
<boost/serialization/list.hpp>
#include
<boost/serialization/vector.hpp>
#include
<boost/serialization/base_object.hpp>
/////////////////////////////////////////////////////////////
// gps coordinate
//
// illustrates serialization for a simple
type
//
class gps_position
{
private:
friend class
boost::serialization::access;
// When the class Archive corresponds to
an output archive, the
// & operator is defined similar to
<<. Likewise, when the class Archive
// is a type of input archive the &
operator is defined similar to >>.
template<class
Archive>
void serialize(Archive & ar, const
unsigned int version)
{
ar &
degrees;
ar &
minutes;
ar &
seconds;
ar &
day;
}
public:
int degrees;
int minutes;
float seconds;
std::string day;
gps_position(){};
gps_position(int d, int m, float s,
std::string inDay) :
degrees(d),
minutes(m), seconds(s), day(inDay)
{}
};
int main() {
// create and open a character archive
for output
std::ofstream
ofs("filename");
// create class instance
const gps_position g(35, 59, 24.567f,
"Monday_Pointer");
const gps_position g1(45, 69, 34.567f,
"Tuesday_Pointer");
const gps_position * g2 = new
gps_position(1,2,3.3, "WEDNESDAY_PTR");
{
boost::archive::text_oarchive oa(ofs);
oa <<
g;
oa <<
g1;
oa <<
(*g2);
}
{
/**gps_position
g;
std::vector<gps_position> vec;
std::ifstream
ifs("filename");
boost::archive::text_iarchive ia(ifs);
while
(!ifs.eof()) {
std::cout << " ++++++++++++++++ " <<
std::endl;
ia >> g;
std::cout << g.degrees << " : "
<< g.minutes << "
: "
<< g.seconds << " : "
<< g.day <<std::endl;
std::cout << " **************** " <<
std::endl;
}*/
}
{
// Using boost
vector
std::vector<gps_position> gps;
std::ifstream
ifs("filename");
boost::archive::text_iarchive ia(ifs);
ia >>
gps;
for (int i = 0;
i < gps.size(); ++i) {
std::cout << gps[i].degrees << " : "
<< gps[i].minutes << " : "
<< gps[i].seconds << " : "
<< gps[i].day <<std::endl;
}
}
return 0;
}
// File data that is being read
$ cat filename
22 serialization::archive 4 0 0 35 59 24.566999 14
Monday_Pointer 45 69 34.567001 15 Tuesday_Pointer 1 2 3.3 13
WEDNESDAY_PTR
// Output of program with while loop, don’t know
why eof is not being detected after reading three gps position
objects
++++++++++++++++
35 : 59 : 24.567 : Monday_Pointer
****************
++++++++++++++++
45 : 69 : 34.567 : Tuesday_Pointer
****************
++++++++++++++++
1 : 2 : 3.3 : WEDNESDAY_PTR
****************
++++++++++++++++
terminate called after throwing an instance of
'boost::archive::archive_exception'
what(): stream error
Aborted (core dumped)
//Output of program with using vector
terminate called after throwing an instance of
'boost::archive::archive_exception'
what(): stream error
Aborted (core dumped)
Thanks
Priyank