Wince obtains the device name, connection status, and signal strength of Wi-Fi.

Note: supported by ce4.0 or later (compatible with ndis5.1)

I. Add header files

#include <winioctl.h>
#include <ntddndis.h>
#include <nuiouser.h>

2. Attach to ndisuio

HANDLE hNdis = ::CreateFile( NDISUIO_DEVICE_NAME, GENERIC_ALL, 0, NULL, OPEN_EXISTING,
                             FILE_ATTRIBUTE_NORMAL|FILE_FLAG_OVERLAPPED,
                             (HANDLE)INVALID_HANDLE_VALUE );

3. Get the device name

UCHAR                  cbQueryBuffer[ 1024 ];
PNDISUIO_QUERY_BINDING pQueryBinding;
DWORD                  dwBytesReturned = 0;

pQueryBinding = (PNDISUIO_QUERY_BINDING)&cbQueryBuffer[ 0 ];
pQueryBinding->BindingIndex = 0;

if ( ::DeviceIoControl( hNdis,
                        IOCTL_NDISUIO_QUERY_BINDING,
                        (LPVOID)&cbQueryBuffer[ 0 ],
                        sizeof(NDISUIO_QUERY_BINDING),
                        (LPVOID)&cbQueryBuffer[ 0 ],
                        sizeof(cbQueryBuffer),
                        &dwBytesReturned,
                        NULL ) == TRUE )
{
    TCHAR* pDeviceName = (TCHAR*)( cbQueryBuffer + pQueryBinding->DeviceNameOffset );
}

 

Iv. Check connection status

NIC_STATISTICS nicStatistics = { 0 };
DWORD          dwBytesReturned = 0;
BOOL bConnected = FALSE;

nicStatistics.ptcDeviceName = pDeviceName;

if ( ::DeviceIoControl( hNdis,
                        IOCTL_NDISUIO_NIC_STATISTICS,
                        NULL,
                        0,
                        &nicStatistics,
                        sizeof(NIC_STATISTICS),
                        &dwBytesReturned,
                        NULL ) == TRUE )
{
    bConnected = ( nicStatistics.MediaState == MEDIA_STATE_CONNECTED );
}

5. Obtain signal strength

// example.
// < -90 : No Signal
// < -81 : Very Low
// < -71 : Low
// < -67 : Good
// < -57 : Very Good
// ...   : Excellent

NDISUIO_QUERY_OID ndisQueryOid = { 0 };
DWORD             dwBytesReturned = 0;
int nDb = 0;

ndisQueryOid.Oid = OID_802_11_RSSI;
ndisQueryOid.ptcDeviceName = pDeviceName;

if ( ::DeviceIoControl( hNdis,
                        IOCTL_NDISUIO_QUERY_OID_VALUE,
                        (LPVOID)&ndisQueryOid,
                        sizeof(ndisQueryOid),
                        (LPVOID)&ndisQueryOid,
                        sizeof(ndisQueryOid),
                        &dwBytesReturned,
                        NULL ) == TRUE )
{
    ::CopyMemory( &nDb, &ndisQueryOid.Data[ 0 ], sizeof(ULONG) );
}