Re: how to connect other PCs/PPCs via 802.11
From: compulim (123)
Date: 06/30/04
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Date: Wed, 30 Jun 2004 13:05:47 +0800
There are no ways to search devices with WiFi. Unlike Bluetooth, WiFi forms
a network, Bluetooth forms peer connections. In Ethernet, there's no way to
search for a device neither.
Apart from forming network and security, WiFi is just an Ethernet
over-the-air. So use WinSock library to do it as you would do in Ethernet.
Compulim
"Eric" <eric.yun@meta4hand.com> wrote in message
news:Oe4ySkSXEHA.1652@TK2MSFTNGP09.phx.gbl...
> hi compulim,
>
> Thank you very much for your reply. It is really helpful--I found the
> problem right after I posted the original message. As you said,
Disassociate
> is not for disassociate, but for power off.
>
> I checked my PDAs. E800 is using PXA263/400MHZ, and HP5450 is using
PXA250.
>
> For my application, it is able to do network search (find networks'
> names/signal strengths/network types, etc), connect to one network with
> infrastructure/ad-hoc mode. Now I am looking for some docments/sample code
> for how to talk to other devices in the same network. Winsock? But how can
I
> find the receiver's IP address? WiFi network search can only return AP's
Mac
> address (Infrastructure mode) or network Mac address (a random value,
ad-hoc
> mode). Assuming in an ad-hoc network, there are three devices A, B, and C.
> How can A find B's or C's IP address and sending packets through Winsock?
>
> Eric
>
> "compulim" <123> wrote in message
> news:OICO641WEHA.1908@TK2MSFTNGP12.phx.gbl...
> > Hi Eric,
> >
> > Many drivers implementataion in Pocket PC is not functioning as it
should
> > be.
> >
> > So if you found one device work and another not working (with same
code),
> it
> > maybe normal.
> >
> > I'm developing WiFi applications on 4150 and Prism cards and both
behaves
> > very different.
> >
> > Check out Microsoft's document on Windows XP about NDIS and WiFi (ya,
> > Windows XP). It outlines all OID and their behaviors. For example,
> > "Disassociate" call is NOT just disconnect from network. But also turn
> WiFi
> > off. So be sure to check it out.
> >
> > btw, do you know what chipset e800 and 5 series is running? I just wrote
a
> > WiFi scanner that works on 4150 and Prism. Grab it at
> > www.kasuei.com/wifigraph
> >
> >
> > Cheers,
> >
> > Compulim
> >
> >
> > "Eric" <eric.yun@meta4hand.com> wrote in message
> > news:%23DCW0fiWEHA.2844@TK2MSFTNGP12.phx.gbl...
> > > hello,
> > >
> > > I am writing an application for PPC which needs to search other
> > > computers/APs with 802.11b connection.I have finished the "search"
part
> > > successfully: scan the network, retrieve the BSSID list, find out
SSIDs
> > and
> > > their connection type(Infrastructure/Ad hoc). Now I want to let my PPC
> > > connect one of PCs/PPCs. But it does not work. Basically I called
> > following
> > > three functions to complete the connection:
> > >
> > > 1. Disassociate(): requests PPC to disassociate the current AP;
> > > 2. SetNetworkConnectionMode(): sets connection mode to Infrastructure
or
> > Ad
> > > Hoc
> > > 3. SetAssociated(): sets connection
> > >
> > > Now I did not consider authentication and I will complete this part
> after
> > > the above code works. I tested the codeon Toshiba E800 and IPAQ5450;
> each
> > > time I tried,there was one or two errors, sometimes I cannot
> disassociate,
> > > sometimes I cannot set connection mode, and sometimes I cannot set
> > > associated AP/PC/PPC. I copied the code below,I am wondering whether
> > anybody
> > > wants to take a look at it and tell me what is the problem?
> > >
> > > BTW, I know I need disable wireless zero config, but I do not know
how.
> I
> > > think the errors I have do not come from wireless zero config.
> > >
> > > The Errors I have:
> >
>
> --------------------------------------------------------------------------
> > --
> > > --------
> > > |Error code| Error Description | Function |
> Device
> > > |
> > >
> >
>
|---------------------------------------------------------------------------
> > > --------
> > > | 31 |A device attached to the system | Disassociate() |
> Toshiba
> > > E800 |
> > > | |is not functioning | |
> > > |
> >
>
> --------------------------------------------------------------------------
> > --
> > > ---------
> > > | 50 |The network request is not | SetAssociated() |
> Toshiba
> > > E800 |
> > > | |supported | |
> > > |
> >
>
> --------------------------------------------------------------------------
> > --
> > > ---------
> > > | 1784 |The supplied user buffer is not
> |SetNetworkConnectionMode()|
> > IP
> > > AQ 5450 |
> > > | |valid for the requested operation|
> |
> > > |
> >
>
> --------------------------------------------------------------------------
> > --
> > > ---------
> > > *note: Error 50 means I cannot set OID_802_11_BSSID (I am not sure
> whether
> > > my understanding is correct), but
> > > I tried query OID_802_11_BSSID, it works fine.
> > >
> > > ####Code##########
> > >
> > > BOOL EstablishConnection(NDIS_802_11_MAC_ADDRESS
DestinationMacAddress,
> > int
> > > connectionMode){
> > > /* DestinationMacAddress: Destination PC's or PPC's MacAddress;
> > > connectionMode: Infrastructure or Ad Hoc
> > > */
> > >
> > > /*Disassociate*/
> > >
> > > BOOL retval = Disassociate();
> > > if(!retval) return FALSE;
> > >
> > >
> > > /*Set Infrastructure/Ad Hoc Mode*/
> > > int mode = connectionMode;
> > > retval = SetNetworkConnectionMode(&mode);
> > > if(!retval) return FALSE;
> > >
> > >
> > > /*Set Associated AP/PC/PPC*/
> > >
> > > retval = SetAssociated(DestinationMacAddress);
> > > if(!retval) return FALSE;
> > >
> > > return TRUE;
> > >
> > > }
> > >
> > >
> > > BOOL Disassociate()
> > > {
> > > UCHAR QueryBuffer[1024];
> > > PNDISUIO_SET_OID pSetOid;
> > > DWORD dwBytesReturned=0;
> > >
> > > pSetOid = (PNDISUIO_SET_OID) &QueryBuffer[0];
> > > pSetOid->ptcDeviceName = ptcDeviceName;
> > > pSetOid->Oid = OID_802_11_DISASSOCIATE;
> > >
> > > if (!DeviceIoControl(g_hNdisUio,
> > > IOCTL_NDISUIO_SET_OID_VALUE,
> > > (LPVOID) &QueryBuffer[0],
> > > sizeof(QueryBuffer),
> > > (LPVOID) &QueryBuffer[0],
> > > 0,
> > > &dwBytesReturned,
> > > NULL))
> > > {
> > > TCHAR szOut[64];
> > > long e = GetLastError();
> > > wsprintf(szOut, TEXT("Cannot Disassociate with Current Device\nError
> > Code:
> > > %d"),e );
> > > MessageBox(0,szOut,TEXT("Error"),MB_OK);
> > > return FALSE;
> > > }
> > >
> > > return TRUE;
> > > }
> > >
> > > BOOL SetNetworkConnectionMode(int *pnNetType)
> > > {
> > > UCHAR SetBuffer[sizeof(NDISUIO_SET_OID) +
> > > sizeof(NDIS_802_11_NETWORK_INFRASTRUCTURE)];
> > > PNDISUIO_SET_OID pSetOid;
> > > DWORD dwBytesReturned=0;
> > >
> > > if (!pnNetType)
> > > {
> > > return FALSE;
> > > }
> > >
> > > else
> > > {
> > > pSetOid = (PNDISUIO_SET_OID) &SetBuffer[0];
> > > pSetOid->ptcDeviceName = ptcDeviceName;
> > > pSetOid->Oid = OID_802_11_INFRASTRUCTURE_MODE;
> > >
> > > memcpy(&pSetOid->Data[0], pnNetType,
> > > sizeof(NDIS_802_11_NETWORK_INFRASTRUCTURE));
> > >
> > > if (!DeviceIoControl(g_hNdisUio,
> > > IOCTL_NDISUIO_SET_OID_VALUE,
> > > (LPVOID) &SetBuffer[0],
> > > sizeof(SetBuffer),
> > > (LPVOID) &SetBuffer[0],
> > > 0,
> > > &dwBytesReturned,
> > > NULL))
> > > {
> > > TCHAR szOut[64];
> > > long e = GetLastError();
> > > wsprintf(szOut, TEXT("Set Network Connection Mode\nError Code:
> > %d"),e );
> > > MessageBox(0,szOut,TEXT("Error"),MB_OK);
> > > return FALSE;
> > > }
> > > }
> > >
> > > return TRUE;
> > > }
> > >
> > >
> > > BOOL SetAssociated(NDIS_802_11_MAC_ADDRESS DestinationMacAddress)
> > > {
> > > UCHAR SetBuffer[sizeof(NDISUIO_SET_OID) +
> > sizeof(NDIS_802_11_MAC_ADDRESS)];
> > > PNDISUIO_SET_OID pSetOid;
> > > DWORD dwBytesReturned=0;
> > > int i = 0;
> > >
> > > pSetOid = (PNDISUIO_SET_OID) &SetBuffer[0];
> > > pSetOid->ptcDeviceName = ptcDeviceName;
> > > pSetOid->Oid = OID_802_11_BSSID;
> > >
> > > for ( i = 0; i < 6; i++ )
> > > {
> > > pSetOid->Data[i] = DestinationMacAddress[i];
> > > }
> > >
> > > if (!DeviceIoControl(g_hNdisUio,
> > > IOCTL_NDISUIO_SET_OID_VALUE,
> > > (LPVOID) &SetBuffer[0],
> > > sizeof(SetBuffer),
> > > (LPVOID) &SetBuffer[0],
> > > 0,
> > > &dwBytesReturned,
> > > NULL))
> > > { TCHAR szOut[64];
> > >
> > > long e = GetLastError();
> > > wsprintf(szOut, TEXT("Set Associated AP/PC ERROR\nError Code:
> %d"),e );
> > > MessageBox(0,szOut,TEXT("Error"),MB_OK);
> > > return FALSE;
> > > }
> > >
> > > return TRUE;
> > > }
> > >
> > >
> > > ####End of Code##########
> > >
> > >
> >
> >
>
>
- Next message: Arkady Frenkel: "Re: Wireless LAN SDK"
- Previous message: Chris Glenn: "DNS Management"
- In reply to: Eric: "Re: how to connect other PCs/PPCs via 802.11"
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