serialization and deserialization problem

  • Thread starter AnkitAsDeveloper [Ankit]
  • Start date
A

AnkitAsDeveloper [Ankit]

Hi i am serializing a 'ref struct' object as follows :



private: void Seri( String ^path, Object^ obj )
{
FileStream^ fileStrm ;
try
{
//Serialize entire object into Binary stream
fileStrm = File::Open( path , FileMode::Create );
BinaryFormatter^ binFormatter = gcnew BinaryFormatter();
binFormatter->Serialize(fileStrm, obj );
}
finally
{
if (fileStrm != nullptr )
{
fileStrm->Flush();
fileStrm->Close();
}
}
}

private: Object ^ Desi(String ^path)
{
FileStream ^fileStream ;
Object ^obj ;
try
{
fileStream = File::Open(path ,FileMode::Open );
BinaryFormatter^ binFormatter = gcnew BinaryFormatter();
obj = binFormatter->Deserialize(fileStream);
}
finally
{
if (fileStream != nullptr )
{
fileStream->Close();
}
}
return obj;

}

// now i am serializing it in follwing way...

WayPoint2 ^waypoint1 = gcnew WayPoint2( gcnew LatLog(41.0,-75.0),
"First","Description", DateTime::Now.AddHours( -10) ,
DateTime::Now.AddHours( -8) ) ;

Seri( "a.waypoint", waypoint1 );

//Serialization works fine.... but following deserialization throws me
exception...

WayPoint2 ^waypoint = ( WayPoint2 ^) this->Desi("a.waypoint") ;

// Exception :
'System.Runtime.Serialization.SerializationException' occurred in
mscorlib.dll
Additional information: Binary stream '169' does not contain a valid
BinaryHeader. Possible causes are invalid stream or object version
change between serialization and deserialization.

// The definition of struct WayPoint2 is as follows
[Serializable]
public ref struct WayPoint2
{
public :
LatLog ^LatLong;
String ^Name;
String ^Description;
DateTime ^Arrival;
DateTime ^Departure;
WayPoint2()
{
this->LatLong = gcnew LatLog();
this->Name = String::Empty ;
this->Description = String::Empty ;
this->Arrival = DateTime::Now ;
this->Departure = DateTime::Now ;
}

WayPoint2 ( LatLog ^latlog, String ^name, String ^description,
DateTime ^arrival, DateTime ^departure)
{
this->LatLong = latlog;
this->Name = name ;
this->Description = description ;
this->Arrival = arrival ;
this->Departure = departure ;
}
}

Can any one help me to sesolve this problem? i have taken care of
Flushing, null references; still its not working.


[Ankit Jain]
http://www.ankitjain.info/ankit/
 
W

Willy Denoyette [MVP]

DateTime is a value type, remove the ^ from...

DateTime Arrival;
DateTime Departure;

WayPoint2 ( LatLog ^latlog, String ^name, String ^description, DateTime
arrival, DateTime departure)

Willy.
 
A

AnkitAsDeveloper [Ankit]

Thankx for replying.

The problem is solved. The deserialization works for value type
DateTime object. And when we create reference type object of DateTime
it thows SerializationException.

But still a question is roaming in my mind is why it allows to create
reference type objects even though it is defined as 'public sealed
struct DateTime', ie value type ?

[Ankit Jain]
http://www.ankitjain.info/ankit/

DateTime is a value type, remove the ^ from...

DateTime Arrival;
DateTime Departure;

WayPoint2 ( LatLog ^latlog, String ^name, String ^description, DateTime
arrival, DateTime departure)

Willy.


AnkitAsDeveloper said:
Hi i am serializing a 'ref struct' object as follows :



private: void Seri( String ^path, Object^ obj )
{
FileStream^ fileStrm ;
try
{
//Serialize entire object into Binary stream
fileStrm = File::Open( path , FileMode::Create );
BinaryFormatter^ binFormatter = gcnew BinaryFormatter();
binFormatter->Serialize(fileStrm, obj );
}
finally
{
if (fileStrm != nullptr )
{
fileStrm->Flush();
fileStrm->Close();
}
}
}

private: Object ^ Desi(String ^path)
{
FileStream ^fileStream ;
Object ^obj ;
try
{
fileStream = File::Open(path ,FileMode::Open );
BinaryFormatter^ binFormatter = gcnew BinaryFormatter();
obj = binFormatter->Deserialize(fileStream);
}
finally
{
if (fileStream != nullptr )
{
fileStream->Close();
}
}
return obj;

}

// now i am serializing it in follwing way...

WayPoint2 ^waypoint1 = gcnew WayPoint2( gcnew LatLog(41.0,-75.0),
"First","Description", DateTime::Now.AddHours( -10) ,
DateTime::Now.AddHours( -8) ) ;

Seri( "a.waypoint", waypoint1 );

//Serialization works fine.... but following deserialization throws me
exception...

WayPoint2 ^waypoint = ( WayPoint2 ^) this->Desi("a.waypoint") ;

// Exception :
'System.Runtime.Serialization.SerializationException' occurred in
mscorlib.dll
Additional information: Binary stream '169' does not contain a valid
BinaryHeader. Possible causes are invalid stream or object version
change between serialization and deserialization.

// The definition of struct WayPoint2 is as follows
[Serializable]
public ref struct WayPoint2
{
public :
LatLog ^LatLong;
String ^Name;
String ^Description;
DateTime ^Arrival;
DateTime ^Departure;
WayPoint2()
{
this->LatLong = gcnew LatLog();
this->Name = String::Empty ;
this->Description = String::Empty ;
this->Arrival = DateTime::Now ;
this->Departure = DateTime::Now ;
}

WayPoint2 ( LatLog ^latlog, String ^name, String ^description,
DateTime ^arrival, DateTime ^departure)
{
this->LatLong = latlog;
this->Name = name ;
this->Description = description ;
this->Arrival = arrival ;
this->Departure = departure ;
}
}

Can any one help me to sesolve this problem? i have taken care of
Flushing, null references; still its not working.


[Ankit Jain]
http://www.ankitjain.info/ankit/
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