The program run ok when I compile it with mingw, but if I compile it use vc71, the program will crash when excute "pbb->Load( ifs );". Thinks! code: //---------------------------------------------------------------------------- #include <string> #include <iostream> #include <fstream> #include #include //---------------------------------------------------------------------------- using namespace std; //---------------------------------------------------------------------------- class A { private: friend class boost::serialization::access; template<class Archive> void serialize(Archive & ar, const unsigned int version) { ar & a; ar & b; } public: int a; int b; void Load( std::ifstream& ifs ) { boost::archive::text_iarchive ia(ifs); ia >> *this; } void Save( std::ofstream& ofs ) { boost::archive::text_oarchive oa(ofs); const A& refa = *this; oa << refa; } }; //---------------------------------------------------------------------------- class B { private: friend class boost::serialization::access; template<class Archive> void serialize(Archive & ar, const unsigned int version) { ar & ms; ar & a; } public: void Load( std::ifstream& ifs ) { boost::archive::text_iarchive ia(ifs); ia >> *this; } void Save( std::ofstream& ofs ) { boost::archive::text_oarchive oa(ofs); const B& refb = *this; oa << refb; } public: B( const string& s ) : ms( s ){} void print(){ cout << ms << endl; } private: string ms; A a; }; //---------------------------------------------------------------------------- int test_TestStorage() { // Save A* pa = new A; pa->a = 3; pa->b = 5; B* pb = new B( "this is test B" ); std::ofstream ofs( "all.out" ); pa->Save( ofs ); pb->Save( ofs ); delete pa; delete pb; ofs.close(); // Load A* paa = new A; B* pbb = new B( "" ); std::ifstream ifs( "all.out", std::ios::binary ); paa->Load( ifs ); pbb->Load( ifs ); cout << "A: " << paa->a << " " << paa->b << endl; pbb->print(); delete paa; delete pbb; return 0; } //---------------------------------------------------------------------------- int main( void ) { test_TestStorage(); return 0; } 2007/12/31, Mahesh Venkitachalam :

In my application, I am am saving 2 objects into the same archive and then reading them back correctly in the same order - so it is possible. Maybe you could post how you implemented "Load" and "Save" and I can try to help you.

Mahesh

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Thank you, Robert. I really want to konw why the program can run successful when using mingw to compile, and will crash when using vc71 to compile. I have debug and trace into the code, I found when I execute pbb->Load( ifs );, it will call this function: basic_text_iarchive<Archive>::init(void){ // read signature in an archive version independent manner std::string file_signature; * this->This() >> file_signature; if(file_signature != ARCHIVE_SIGNATURE()) boost::throw_exception( archive_exception(archive_exception::invalid_signature) ); the file_signature is empty, so throw the exception invalid_signature. Can you tell me, why it like this? 2008/1/2, Robert Ramey :

Rather than put your program on my debugger, here is the way I anticipated that the library would be used:

...

#include <iostream>

#include <fstream>

#include #include #include

//---------------------------------------------------------------------------- using namespace std;

//---------------------------------------------------------------------------- class A { private: friend class boost::serialization::access; template<class Archive> void serialize(Archive & ar, const unsigned int version) { ar & a; ar & b; }

public: int a; int b;

};

//---------------------------------------------------------------------------- class B { private: friend class boost::serialization::access; template<class Archive> void serialize(Archive & ar, const unsigned int version) { ar & ms; ar & a; } public:

public: B( const string& s ) : ms( s ){} void print(){ cout << ms << endl; } private: B(){} // use by serialization only string ms; A a; };

//---------------------------------------------------------------------------- int main() { // Save A* pa = new A; pa->a = 3; pa->b = 5;

B* pb = new B( "this is test B" );

{ std::ofstream ofs( "all.out" ); boost::archive::text_oarchive oa(ofs);

oa << pa; ob << pb;

delete pa; delete pb; } A* paa; B* pbb { std::ifstream ifs( "all.out", std::ios::binary );

boost::archive::text_oarchive ia(ifs); ia >> paa; ia >> pbb; }

cout << "A: " << paa->a << " " << paa->b << endl; pbb->print();

delete paa; delete pbb; return 0; }

Robert Ramey

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