c# 如何使用wlanapi连接电脑到wifi

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　　http://www.codeproject.com/Articles/72105/Manage-WiFi-with-Native-API-WIFI-on-Windows-XP-SP
　　

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(
"<?xml version=\"1.0\"?>
<WLANProfile xmlns=\"http://www.microsoft.com/networking/WLAN/profile/v1\">
<name>{0}</name><SSIDConfig><SSID><name>{0}</name></SSID></SSIDConfig>
<connectionType>ESS</connectionType><MSM><security><authEncryption>
<authentication>open</authentication><encryption>WEP</encryption>
<useOneX>false</useOneX></authEncryption><sharedKey>
<keyType>networkKey</keyType><protected>false</protected>
<keyMaterial>{1}</keyMaterial></sharedKey><keyIndex>0</keyIndex>
</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;
//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;
}

　　
　　补充参考：
　　http://stackoverflow.com/questions/6318575/connect-to-a-wireless-network-in-c-sharp
　　http://msdn.microsoft.com/en-us/library/windows/desktop/aa370032(v=vs.85).aspx
　　http://msdn.microsoft.com/en-us/library/windows/desktop/aa369853(v=vs.85).aspx