c# - Issues with using Managed WiFi (NativeWiFi API)

Question

I am trying to create and connect to a WLAN profile using Native WiFi (https://managedwifi.codeplex.com/). I am able to view all the Network BSS List and their parameters. However, when I am trying to create/overwrite a WLAN profile, I get the below mentioned error message (Error#1):

An unhandled exception of type 'System.ComponentModel.Win32Exception' occurred in ManagedWifi.dll.

Additional information: The network connection profile is corrupted

However, when I created a profile normally from "Network and Sharing Center" of the Windows 7 control panel and then tried to connect using the ManagedWiFi, I get another error message(Error#2):

An unhandled exception of type 'System.ArgumentException' occurred in mscorlib.dll

Additional information: Type 'NativeWifi.Wlan+WlanReasonCode' cannot be marshaled as an unmanaged structure; no meaningful size or offset can be computed.

I noticed that this error occurs even if I try to connect/disconnect to a WLAN profile from the "Network and Sharing Center", with the windows application running in the background.

Here is the sample code that I am using:

Dim profileName As String = GlobalVariables.ssidname          ' Provides the selected SSID name from the Network BSS List 
Dim hexval As String = StringToHex(GlobalVariables.ssidname)  ' Function to get the hexadecimal value for a provided string
Dim key As String = TextBox1.Text                             ' Security key from the textbook provided

Dim profileXml As String = String.Format("<?xml version=""1.0""?><WLANProfile xmlns=""http://www.microsoft.com/networking/WLAN/profile/v1""><name>{0}</name><SSIDConfig><SSID><hex>{1}</hex><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>{2}</keyMaterial></sharedKey><keyIndex>0</keyIndex></security></MSM></WLANProfile>", 'GlobalVariables.ssidname, hexval, TextBox1.Text)            
wlanIface.SetProfile(Wlan.WlanProfileFlags.AllUser, profileXml, True)  'Error#1 occurs here
wlanIface.Connect(Wlan.WlanConnectionMode.Profile, Wlan.Dot11BssType.Any, profileName)   'Error#2 occurs here

From the forum "Type Native Wifi.Wlan + WlanReasonCode cannot be marshaled error", the issue (Error#2) seems to be within the WlanAPI.cs, where there is a line of code that checks for the size of the return code. This is the line:

int expectedSize = Marshal.SizeOf(typeof(Wlan.WlanReasonCode));
if (notifyData.dataSize >= expectedSize)
{
    Wlan.WlanReasonCode reasonCode = (Wlan.WlanReasonCode)Marshal.ReadInt32(notifyData.dataPtr);
    if (wlanIface != null)
        wlanIface.OnWlanReason(notifyData, reasonCode);
}

Changing the above code to the below seems to fix the issue.

//int expectedSize = Marshal.SizeOf(typeof(Wlan.WlanReasonCode));
if (notifyData.dataSize >= 0)
{
    Wlan.WlanReasonCode reasonCode = (Wlan.WlanReasonCode)Marshal.ReadInt32(notifyData.dataPtr);
    if (wlanIface != null)
        wlanIface.OnWlanReason(notifyData, reasonCode);
}

However, I am not sure on how to add this fix to my solution. I installed the ManagedWiFi from the NuGet Package Manager. Hence, not sure how to change the WlanApi.cs file. Any help regarding the above mentioned two issues are much appreciated.

Answer 1

The issue (Error#1) is now resolved. The profilexml file format was different for me. Here is the profilexml after I changed it.

Dim profileXml As String = String.Format("<?xml version=""1.0""?><WLANProfile xmlns=""http://www.microsoft.com/networking/WLAN/profile/v1""><name>{0}</name><SSIDConfig><SSID><hex>{1}</hex><name>{0}</name></SSID></SSIDConfig><connectionType>ESS</connectionType><connectionMode>auto</connectionMode><MSM><security><authEncryption><authentication>WPA2PSK</authentication><encryption>AES</encryption><useOneX>false</useOneX></authEncryption><sharedKey><keyType>passPhrase</keyType><protected>false</protected><keyMaterial>{2}</keyMaterial></sharedKey></security></MSM></WLANProfile>", GlobalVariables.ssidname, hexval, TextBox1.Text)

Also the second issue (Error#2) was resolved when I uninstalled ManagedWiFi package from my solution and added the whole ManagedWiFi project to the solution. Then I made the change in WlanApi.cs as mentioned in SimpleWiFi Or Type Native Wifi.Wlan + WlanReasonCode cannot be marshaled error.