Qt4 QDataStream(转)

(原)

#include
#include
#include
#include
#include
#include

using namespace std;
#define cout qDebug()

class Dog
{
public: 
 Dog()
 {
  _number = 0;
 }  

 Dog(int number, const QString &name)
 {
  _number = number;
  _name = name;
 }  

 void setNumber(int number)
 {
  _number = number;
 }   

 int number() const
 {
  return _number;
 }  

 void setName(const QString &name)
 {
  _name = name;
 }  

 QString name() const
 {
  return _name;
 }
private: 
 int _number;
 QString _name;
};

QDataStream &operator<<(QDataStream &out, const Dog &dog)
{
 out << dog.number() << dog.name();
 return out;

}QDataStream &operator>>(QDataStream &in, Dog &dog)
{
 int number = 0;
 QString name;
 in >> number >> name;
 dog.setNumber(number);
 dog.setName(name);
 return in;
}

int main(int argc, char *argv[])
{
 /*QFile file("data.dat");
 Dog dog1(1, "caterpillar");
 Dog dog2(2, "momor");
 if(!file.open(QIODevice::WriteOnly))
 {
  cerr << "Cannot open file for writing: " << qPrintable(file.errorString()) << endl;
  return false;
 }       

 QDataStream out(&file);
 out.setVersion(QDataStream::Qt_4_3);
 out << dog1 << dog2;
 file.close();
 if(!file.open(QIODevice::ReadOnly))
 {
  cerr << "Cannot open file for reading: " << qPrintable(file.errorString()) << endl;
  return false;
 }

 QDataStream in(&file);
 in.setVersion(QDataStream::Qt_4_3);
 in >> dog1 >> dog2;
 cout << dog1.number() << ", " << qPrintable(dog1.name()) << endl
   << dog2.number() << ", " << qPrintable(dog2.name()) << endl;*/

 QList list;

 Dog dog1(1, "caterpillar");
 Dog dog2(2, "momor");

 list << dog1 << dog2;

 QList::const_iterator iterator = list.begin();

 while(iterator != list.end()) {
  cout << (*iterator).number() << ", " 
   << qPrintable((*iterator).name()) << endl;
  ++iterator;
 }

 return true;
}