Code Snippets

C# Source Code

Welcome to Dream.In.Code
	Become a C# Expert! Join 300,482 C# Programmers for FREE! Get instant access to thousands of C# experts, tutorials, code snippets, and more! There are 1,767 people online right now. Registration is fast and FREE... Join Now! Chat LIVE With a C# Expert

Get signal strength of WI-FI adapters

This is a snippet used to retrieve the WI-FI signal strength of all WI-FI cards attached to your system. Can be used to tell if you are near a WI-FI connection

Submitted By: PsychoCoder

Actions:

Rating:

Views: 4,279

Language: C#

Last Modified: January 16, 2009

Instructions: Need a reference to the System.Management Namespace

Snippet

/// <summary>
/// method for retrieving the signal strength of all WI-FI adapters
/// </summary>
/// <returns></returns>
public static string GetWIFISignalStrength()
{
try
{
ObjectQuery query = new ObjectQuery("SELECT * FROM MSNdis_80211_ReceivedSignalStrength Where active = true");
ManagementScope scope = new ManagementScope("root\\wmi");
ManagementObjectSearcher searcher = new ManagementObjectSearcher(scope, query);
string result = "";
foreach (ManagementObject obj in searcher.Get())
{
if ((bool)obj["Active"] == true)
{
result += (string)obj["Ndis80211ReceivedSignalStrength"].ToString() + Environment.NewLine;
}
}
if (result == "")
{
result = "No active WI-FI adapters found!";
}
return result.Trim();
}
catch (Exception ex)
{
MessageBox.Show(ex.Message, "Search Error", MessageBoxButtons.OK, MessageBoxIcon.Error);
return string.Empty;
}
}

Copy & Paste

/// <summary>
/// method for retrieving the signal strength of all WI-FI adapters
/// </summary>
/// <returns></returns>
public static string GetWIFISignalStrength()
{
    try
    {
        ObjectQuery query = new ObjectQuery("SELECT * FROM MSNdis_80211_ReceivedSignalStrength Where active = true");
        ManagementScope scope = new ManagementScope("root\\wmi");
        ManagementObjectSearcher searcher = new ManagementObjectSearcher(scope, query);
        string result = "";
        foreach (ManagementObject obj in searcher.Get())
        {
            if ((bool)obj["Active"] == true)
            {
                result += (string)obj["Ndis80211ReceivedSignalStrength"].ToString() + Environment.NewLine;
            }
        }
        if (result == "")
        {
            result = "No active WI-FI adapters found!";
        }

return result.Trim();
    }
    catch (Exception ex)
    {
        MessageBox.Show(ex.Message, "Search Error", MessageBoxButtons.OK, MessageBoxIcon.Error);
        return string.Empty;
    }
}

Comments
christyyim 2008-09-22 06:55:15
hihi, i'm a newbie for programming. but now i have to write a code to extract the signal strength from the wi-fi adapter. and i found this webpage. i wonder how this code works? cos it seems like call a lot functions. but i dunno where is the source code for those function. can anyone give me some clues. thanks
DerekR 2009-01-16 08:18:14
Small but important typo on line 17 Ndis80211ReceivedSingnalStrength should read Ndis80211ReceivedSignalStrength.
PsychoCoder 2009-01-16 09:24:39
Thanks for pointing that out DerekR, fixed :)
ahussain 2009-02-03 06:03:50
Hi, I need to get Wi-Fi signal Strength in my coding plz any one help me how can i get this. Cheers..
ahussain 2009-02-09 07:12:25
Hi every one in forum I tried this piece of code but it did't work please let me know how can i run this code because its output is "SYSTEM NOT SUPPORTED" please help me to run and get signal strenght Thanks