fonction lire ds un port série

Réponse acceptée !
ou ça plutôt :

HANDLE hCom;
OVERLAPPED o;
BOOL fSuccess;
DWORD dwEvtMask;

hCom = CreateFile( "COM1",
GENERIC_READ | GENERIC_WRITE,
0, // exclusive access
NULL, // no security attributes
OPEN_EXISTING,
FILE_FLAG_OVERLAPPED,
NULL
);

if (hCom == INVALID_HANDLE_VALUE)
{
// Handle the error.
}

// Set the event mask.

fSuccess = SetCommMask(hCom, EV_CTS | EV_DSR);

if (!fSuccess)
{
// Handle the error.
}

// Create an event object for use in WaitCommEvent.

o.hEvent = CreateEvent(
NULL, // no security attributes
FALSE, // auto reset event
FALSE, // not signaled
NULL // no name
);

assert(o.hEvent);

if (WaitCommEvent(hCom, &dwEvtMask, &o))
{
if (dwEvtMask & EV_DSR)
{
// To do.
}

if (dwEvtMask & EV_CTS)
{
// To do.
}
}