[Boost-users] [Interprocess] Problem reading or wrting to shared memory

Subject: [Boost-users] [Interprocess] Problem reading or wrting to shared memory
From: Thomas.Schulze_at_[hidden]
Date: 2009-09-07 08:43:20

Hello,
I created a simple class for storing information
in shared memory (native Windows):

template<
class data>
struct SharedData
{
  SharedData<data>():
    value(0),
    var(0.0),
    written(1),
    read(0){
      std::cout<<"  Objekt bei "<<this<<" erzeugt!"<<std::endl;}
 
  int value; // just temporary, will be replaced by a more generic data 
type
  double var; // just temporary, will be replaced by a more generic data 
type
  boost::interprocess::interprocess_semaphore written,read;
};

I created and mapped
that memory like:

boost::interprocess::windows_shared_memory shm (create_only,name,
read_write,sizeof(SharedData<data>));
boost::interprocess::mapped_region region(shm,read_write);

and assigned a new data structure to it's address with:

pShared = new(region.get_address()) SharedData<data>();

with pShared:
SharedData<data>*       pShared;

But when I try to access the stored data with this pointer
my program simply quits.
Probably I am making a really silly mistake?

Kind regards,
Thomas

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