Native API WIFI

Manage WiFi with Native API WIFI on Windows XP SP2

This article will demonstrate the ability to establish and operate a WiFi connection from a C# program using the Wireless LAN API on a Windows XP Embedded SP2 \ Windows XP Pro SP2.
Download example project - 46.18 KB
Pre-requisites
msxml6.msi
WindowsXP-KB918997-v6-x86-ENU.exe
Introduction
This article will demonstrate the ability to establish and operate a WiFi connection from a C# program using the Wireless LAN API on a Windows XP Embedded SP2 \ Windows XP Pro SP2.

Step 1
The first step was to create a function that returns the WiFi networks available for connection. Using the WLANOpenHandle, you create the client to use for the session:

Wlan.WlanOpenHandle(
Wlan.WLAN_CLIENT_VERSION_XP_SP2, <--- (Wireless LAN API for Windows XP with SP2)
IntPtr.Zero,
ref negotiatedVersion,
ref clientHandle)
Step 2
Then list all the wireless LAN interfaces visible from our PC:

Wlan.WlanEnumInterfaces(
clientHandle, <--- (clientHandle precedentemente istanziato)
IntPtr.Zero,
ref pInterfaceList)
Step 3
Using the pointer to the list of available interfaces, we will populate the structure that will contain all Wlan.WLAN_INTERFACE_INFO_LIST NIC interface information:

Wlan.WLAN_INTERFACE_INFO_LIST interfaceList =
new Wlan.WLAN_INTERFACE_INFO_LIST(pInterfaceList);
Step 4
What we are still missing at this point and guidance of our interface to be passed to the function Wlan.WlanGetAvailableNetworkList, we get through this passage:

Guid InterfaceGuid =
((Wlan.WLAN_INTERFACE_INFO)interfaceList.InterfaceInfo[0]).InterfaceGuid;
Step 5
Now we have all the elements to call the API Wlan.WlanGetAvailableNetworkList; declare that we will return the pointer function and proceed:

IntPtr pAvailableNetworkList = IntPtr.Zero;
Wlan.WlanGetAvailableNetworkList( clientHandle,
InterfaceGuid,
Wlan.WlanGetAvailableNetworkFlags.
IncludeAllManualHiddenProfiles,
IntPtr.Zero,
out ppAvailableNetworkList)
Scroll through the list of connections:

Wlan.WLAN_AVAILABLE_NETWORK_LIST wlanAvailableNetworkList =
new Wlan.WLAN_AVAILABLE_NETWORK_LIST(pAvailableNetworkList);
Wlan.WlanFreeMemory(pAvailableNetworkList);
for (int j = 0; j < wlanAvailableNetworkList.dwNumberOfItems; j++)
{
Wlan.WLAN_AVAILABLE_NETWORK network = wlanAvailableNetworkList.Networks[j];
string SSId = GetStringForSSID(network.dot11Ssid);
if(ssid != "")
{
//Connessione
Wifi_SetProfile(network.dot11DefaultAuthAlgorithm, SSId);
}
}
Depending on the type of connection configured for my Access Point imposed the correct profile and I connect:

static void Wifi_SetProfile(Wlan.DOT11_AUTH_ALGORITHM connType, string sNetSSId)
{
switch (connType)
{
//WEP - OPen
case Wlan.DOT11_AUTH_ALGORITHM.DOT11_AUTH_ALGO_80211_OPEN:
profileXml = string.Format(
"
<WLANProfile xmlns="http://www.microsoft.com/networking/WLAN/profile/v1">
{0}{0}
ESS
openWEP
false
networkKeyfalse
{1}0
",
profileName, key);

  Wlan.WlanSetProfile( clientHandle, 
		InterfaceGuid, 
		Wlan.WlanProfileFlags.AllUser, 
		profileXml, 
		null, 
		true, 
		IntPtr.Zero, 
		out reasonCode); 

 if(reasonCode==Wlan.WlanReasonCode.Success) 
 { 
    //Connect!!! 
    ... 
 } 
 else 
 { 
    //Return usually 1168 – Error is on profile Xml or on key 
 } 
 break;

 //WPA_PSK 
 case Wlan.DOT11_AUTH_ALGORITHM.DOT11_AUTH_ALGO_WPA_PSK: 
 profileXml = string.Format("<?xml version=\"1.0\" encoding=\"US-ASCII\"?>
     <WLANProfile xmlns=\"http://www.microsoft.com/networking/WLAN/profile/v1\">
     <name>{0}</name><SSIDConfig><SSID><name>{0}</name></SSID></SSIDConfig>
     <connectionType>ESS</connectionType><connectionMode>auto</connectionMode>
     <autoSwitch>false</autoSwitch><MSM><security><authEncryption>
     <authentication>WPAPSK</authentication><encryption>TKIP</encryption>
     <useOneX>false</useOneX></authEncryption><sharedKey>
     <keyType>passPhrase</keyType><protected>false</protected>
     <keyMaterial>{1}</keyMaterial></sharedKey></security></MSM></WLANProfile>", 
     profileName, key);

	 Wlan.WlanSetProfile( clientHandle, 
                      InterfaceGuid, 
                      Wlan.WlanProfileFlags.AllUser, 
                      profileXml, 
                      null, 
                      true, 
                      IntPtr.Zero, 
                      out reasonCode);

	 if(reasonCode == Wlan.WlanReasonCode.Success) 
 { 
     //Connect!!! 
     ... 
 } 
 else 
 { 
    //Return usually 1168 – Error is on profile Xml or on key 
 } 
 break; 

}
If all parameters are correct, you should be connected to the network.
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