ATL / WTL / STL

SYSTEMTIME m_current_time;
GetSystemTime( &m_current_time );
int t1 = sizeof( m_current_time );
// This is the case where you try to convert your instance into a pointer incorrectly:
int chars_sent = m_C_Server_Send_Time_Socket->Send( (LPCTSTR) m_current_time, t1,   0 );
// Here is the correct way to do that:
int chars_sent = m_C_Server_Send_Time_Socket->Send( (LPCTSTR) &m_current_time, t1,   0 );
// Note that every pointer can be converted into (const void*)
//  so the cast is totally unnecessary and you can write simply:
int chars_sent = m_C_Server_Send_Time_Socket->Send( &m_current_time, t1, 0 );

SYSTEMTIME m_current_time;

// The following steps the pointer with sizeof(SYSTEMTIME) bytes in memory!!!!!
// The resulting pointer points to the first byte that follows the last byte of your struct.
SYSTEMTIME* p = &m_current_time + 1;

//Since pointers and arrays in C/C++ work very similarly the above code is identical to this:
SYSTEMTIME* p = &(&m_current_time)[1];
//Pointer arithmetic and array indexing behave very similarly.

// The following expressions step the pointer just by 1 byte (sizeof(char)) in memory!!!!!
// We basically index into our struct as if it was a byte array...
// This is what MS guys wanted to do but in some cases (with unicode character setting)
// their code steps the pointer with 2 byte granularity (sizeof(whcar_t)) that is a bug.
char* p = (char*)&m_current_time + 1;

// The statements below are also valid because <code>char*</code> (like any other non-const
// pointer) is automatically casted to both <code>void*</code> and <code>const void*</code>.
void* p = (char*)&m_current_time + 1;
const void* p = (char*)&m_current_time + 1;

khaliloenit wrote:

but i didn't know what i do after

bkelly13 wrote:

Then the buttons for the client are selected to Initialize, wsa error = 0, then Connect to the same IP address and port.   It gets wsa error code 10048,   WSAEADDRINUSE, address already in use.   Hmmm.   Yeah, it is in use, but if it is not in use by a server then the client cannot connect.

bool C_Server::Class_Initialize()
{ ...
  m_winsock_status = AfxSocketInit();
...
  m_winsock_status = Create( m_port_number,  // value is 49000
                             SOCK_STREAM,
                             FD_READ | FD_WRITE | FD_OOB | FD_ACCEPT | FD_CONNECT | FD_CLOSE,
                             DEFAULT_IP_ADDRESS );  // value is 127.0.0.1
...}

bool C_Server::Class_Listen()
{
   m_winsock_status = Listen();
... }

bool C_Server::Class_Accept()
{
   mp_C_Server_Send_Time_Socket = new C_Server_Send_Time_Socket;
   m_winsock_status = Accept( *mp_C_Server_Send_Time_Socket );
...}