Client.h

#include <math.h>

#define BOOST_ALL_NO_LIB
#include <boost/interprocess/shared_memory_object.hpp>
#include <boost/interprocess/mapped_region.hpp>
#include <boost/interprocess/sync/scoped_lock.hpp>
#include <boost/interprocess/sync/interprocess_mutex.hpp>
#include <iostream>
#include <cstdio>
#include <cstdlib>

using namespace boost::interprocess;
#define SHAREDLENGTH (1024*1024) // 1mb of shared memory

// This structure is extremely brittle
struct sharedPt
{
	enum { dataLength = SHAREDLENGTH};
	interprocess_mutex mutex;
	uint8_t  data[dataLength]; 
};

shared_memory_object shm;

mapped_region region;

void getSharedData(char* name, uint8_t *data, int ofs, int sz)
{      
	try 
	{
		//Open the shared memory object.
		shared_memory_object shm(open_only ,name, read_write);

		//Map the whole shared memory in this process
		mapped_region region(shm ,read_write);

		//Get the address of the mapped region
		void * addr = region.get_address();

		//Construct the shared structure in memory
		sharedPt * spt_ = static_cast<sharedPt*>(addr);

		//scoped_lock<interprocess_mutex> lock(sIm->mutex);
		memcpy(data, (char*)spt_->data + ofs, sz);   
	}	
	catch (interprocess_exception &ex)
	{
		printf("getFrame:%s\n", ex.what());
	}
}