Hi,

I am trying to get SSID of the accesspoint my handheld is connected to using NDIS.

The code is as below::


But DeviceIoControl always returns 0 and GetLastError() shows the error code as 87...Invalid Parameter..I searched for this on the net, but did not find a solution. Can anybody tell me the solution for this.

Thanks
Triveni

Hi,

Solved the problem..

regards,
Triveni Prabhu

What was the solution? I am trying to do something similar but I always get Return value 0 with Error code 87. can you post your solution or source code that worked? Thank you

Hi,

I was getting this error because I had passed wrong parameters to DeviceIoControl.
Here is the code which worked

static bool GetSsid(LPCTSTR pszAdapter, NDIS_802_11_SSID* pSsid)
{
HANDLE hDevice = CreateFile(
NDISUIO_DEVICE_NAME, GENERIC_READ,
FILE_SHARE_READ | FILE_SHARE_WRITE,
NULL, OPEN_EXISTING,
FILE_ATTRIBUTE_NORMAL | FILE_FLAG_OVERLAPPED,
NULL);

if (hDevice == INVALID_HANDLE_VALUE)
return false;

BYTE pBuffer[sizeof(NDISUIO_QUERY_OID) + sizeof(NDIS_802_11_SSID)];
PNDISUIO_QUERY_OID pNDISUIOQueryOid = (PNDISUIO_QUERY_OID) pBuffer;

pNDISUIOQueryOid->ptcDeviceName = (PTCHAR) pszAdapter;
pNDISUIOQueryOid->Oid = OID_802_11_SSID;

DWORD dwBytesReturned = 0;

if (!DeviceIoControl(
hDevice, IOCTL_NDISUIO_QUERY_OID_VALUE,
pBuffer, sizeof(pBuffer),
pBuffer, sizeof(pBuffer),
&dwBytesReturned, NULL))
{
CloseHandle(hDevice);
return false;
}

CloseHandle(hDevice);
memcpy(pSsid, pNDISUIOQueryOid->Data, sizeof(NDIS_802_11_SSID));
return true;
}

Parameter "LPCTSTR pszAdapter" can be obtained using GetAdaptersInfo().
Refer "http://geekswithblogs.net/dastblog/category/5236.aspx/rss"
Hope this helps you too. Contact me in case you need more clarifications.

Cheers,
Triveni Prabhu