Sending Struct over UDP

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I want to send a STRUCT over UDP using CAsyncSocket, based on a demo class I found called CUdpAsySk. Sending strings work nicely. Then creating a struct:

//struct defined in CUdpAsySk.h
struct StoSend
{
int16 version;
double gps_lat;
double gps_long;
}
class CUdpAsySk : public CAsyncSocket
{
public:
StoSend*pStoSend;
StoSend*pStoReceive;
...

}
//Send struct in void CUdpAsySk:oAsyncSendBuff()
m_strRemote="192.168.1.5";
m_nPort=4000;
dwBytes = SendTo((const char *)&pStoSend, sizeof(*pStoSend), m_nPort,m_strRemote);


//Receive
nRead = ReceiveFrom((char *)&pStoReceive, 699999, m_strRemote, m_nPort);

This work on local computer when bytes sent are equal or less then 20 bytes, from a remote computer no struct is received. When is failes I receive a:
Unhandled exception at 0x7c1772af (mfc71d.dll) in Device.exe: 0xC0000005: Access violation reading location 0x00000f94.

Anyone here that can help me with this problem?