AndrewEnsley.com » .Net http://andrewensley.com My little contribution to the WWW Thu, 08 Dec 2011 21:37:52 +0000 en hourly 1
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 C# Detect Windows OS Version – Part 2 (WMI) http://andrewensley.com/2009/10/c-detect-windows-os-version-%e2%80%93-part-2-wmi/ http://andrewensley.com/2009/10/c-detect-windows-os-version-%e2%80%93-part-2-wmi/#comments Thu, 08 Oct 2009 04:57:20 +0000 Andrew http://andrewensley.com/?p=969 profileaddressmarketingRecap In case you missed Part 1, I briefly summarized 4 different strategies for programmatically determining the current Operating System in C#.  The code I posted there utilizes the System.Environment class.  It works great and is sufficient for most uses, but sometimes you want need to know everything about the OS, including the edition (i.e. [...]

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Recap

In case you missed Part 1, I briefly summarized 4 different strategies for programmatically determining the current Operating System in C#.  The code I posted there utilizes the System.Environment class.  It works great and is sufficient for most uses, but sometimes you want need to know everything about the OS, including the edition (i.e. "XP Pro" vs. "XP Home").

Summary

For that, Microsoft gives us the lovely Windows Management Instrumentation (WMI) Interface.  You can do a lot of really powerful and interesting things with WMI and WQL, but for this purpose, all we care about is getting some information from it.


The Code

Not all Windows versions support WMI, so we always have to fall back on the Environment class code from Part 1.  Without wasting your time, let's get straight to the code.

WMI

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using System;
using System.Management;
using System.Text.RegularExpressions;

/// <summary>
/// Gets Operating System Name, Service Pack, and Architecture using WMI with the legacy methods as a fallback
/// </summary>
/// <returns>String containing the name of the operating system followed by its service pack (if any) and architecture</returns>
private string getOSInfo()
{
    ManagementObjectSearcher objMOS = new ManagementObjectSearcher("SELECT * FROM  Win32_OperatingSystem");

    //Variables to hold our return value
    string os = "";
    int OSArch = 0;

    try
    {
        foreach (ManagementObject objManagement in objMOS.Get())
        {
            // Get OS version from WMI - This also gives us the edition
            object osCaption = objManagement.GetPropertyValue("Caption");
            if (osCaption != null)
            {
                // Remove all non-alphanumeric characters so that only letters, numbers, and spaces are left.
                string osC = Regex.Replace(osCaption.ToString(),"[^A-Za-z0-9 ]","");
                //string osC = osCaption.ToString();
                // If the OS starts with "Microsoft," remove it.  We know that already
                if (osC.StartsWith("Microsoft"))
                {
                    osC = osC.Substring(9);
                }
                // If the OS now starts with "Windows," again... useless.  Remove it.
                if (osC.Trim().StartsWith("Windows"))
                {
                    osC = osC.Trim().Substring(7);
                }
                // Remove any remaining beginning or ending spaces.
                os = osC.Trim();
                // Only proceed if we actually have an OS version - service pack is useless without the OS version.
                if(!String.IsNullOrEmpty(os))
                {
                    object osSP = null;
                    try
                    {
                        // Get OS service pack from WMI
                        osSP = objManagement.GetPropertyValue("ServicePackMajorVersion");
                        if (osSP != null && osSP.ToString() != "0")
                        {
                            os += " Service Pack " + osSP.ToString();
                        }
                        else
                        {
                            // Service Pack not found.  Try built-in Environment class.
                            os += getOSServicePackLegacy();
                        }
                    }
                    catch (Exception)
                    {
                        // There was a problem getting the service pack from WMI.  Try built-in Environment class.
                        os += getOSServicePackLegacy();
                    }
                }
                object osA = null;
                try
                {
                    // Get OS architecture from WMI
                    osA = objManagement.GetPropertyValue("OSArchitecture");
                    if (osA != null)
                    {
                        string osAString = osA.ToString();
                        // If "64" is anywhere in there, it's a 64-bit architectore.
                        OSArch = (osAString.Contains("64") ? 64 : 32);
                    }
                }
                catch (Exception)
                {
                }
            }
        }
    }
    catch (Exception)
    {
    }
    // If WMI couldn't tell us the OS, use our legacy method.
    // We won't get the exact OS edition, but something is better than nothing.
    if (os == "")
    {
        os = getOSLegacy();
    }
    // If WMI couldn't tell us the architecture, use our legacy method.
    if (OSArch == 0)
    {
        OSArch = getOSArchitectureLegacy();
    }
    return os + " " + OSArch.ToString() + "-bit";
}

Legacy code

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/// <summary>
/// Gets Operating System Name using .Net's Environment class.
/// </summary>
/// <returns>String containing the name of the operating system followed by its service pack (if any)</returns>
private string getOSLegacy()
{
    //Get Operating system information.
    OperatingSystem os = Environment.OSVersion;
    //Get version information about the os.
    Version vs = os.Version;

    //Variable to hold our return value
    string operatingSystem = "";

    if (os.Platform == PlatformID.Win32Windows)
    {
        //This is a pre-NT version of Windows
        switch (vs.Minor)
        {
            case 0:
                operatingSystem = "95";
                break;
            case 10:
                if (vs.Revision.ToString() == "2222A")
                    operatingSystem = "98SE";
                else
                    operatingSystem = "98";
                break;
            case 90:
                operatingSystem = "Me";
                break;
            default:
                break;
        }
    }
    else if(os.Platform == PlatformID.Win32NT)
    {
        switch (vs.Major)
        {
            case 3:
                operatingSystem = "NT 3.51";
                break;
            case 4:
                operatingSystem = "NT 4.0";
                break;
            case 5:
                if (vs.Minor == 0)
                {
                    operatingSystem = "2000";
                }
                else
                {
                    operatingSystem = "XP";
                }
                break;
            case 6:
                if (vs.Minor == 0)
                {
                    operatingSystem = "Vista";
                }
                else
                {
                    operatingSystem = "7";
                }
                break;
            default:
                break;
        }
    }
    //Make sure we actually got something in our OS check
    //We don't want to just return " Service Pack 2"
    //That information is useless without the OS version.
    if(operatingSystem != "")
    {
        //Got something.  Let's see if there's a service pack installed.
        operatingSystem += getOSServicePackLegacy();
    }
    //Return the information we've gathered.
    return operatingSystem;
}

/// <summary>
/// Gets the installed Operating System Service Pack using .Net's Environment class.
/// </summary>
/// <returns>String containing the operating system's installed service pack (if any)</returns>
private string getOSServicePackLegacy()
{
    // Get service pack from Environment Class
    string sp = Environment.OSVersion.ServicePack;
    if (sp != null && sp.ToString() != "" && sp.ToString() != " ")
    {
        // If there's a service pack, return it with a space in front (for formatting)
        return " " + sp.ToString();
    }
    // No service pack.  Return an empty string
    return "";
}

/// <summary>
/// Gets Operating System Architecture.  This does not tell you if the program in running in
/// 32- or 64-bit mode or if the CPU is 64-bit capable.  It tells you whether the actual Operating
/// System is 32- or 64-bit.
/// </summary>
/// <returns>Int containing 32 or 64 representing the number of bits in the OS Architecture</returns>
private int getOSArchitectureLegacy()
{
    string pa = Environment.GetEnvironmentVariable("PROCESSOR_ARCHITECTURE");
    return ((String.IsNullOrEmpty(pa) || String.Compare(pa,0,"x86",0,3,true) == 0) ? 32 : 64);
}

Download this code

Notes

Server Versions

In part 1, the code was completely unaware of Windows Server operating systems.  Fortunately, this WMI approach will tell us about server versions too!  However, you'll notice that it falls back on the old, non-server-aware code.

If detecting server versions is really important to you, you'll probably want to separate out the functions so that you can know every case that the WMI code fails to detect the OS.

OS Architecture

Just a reminder: The code that detects OS Architecture (both WMI, and Environment-class-based) tells us about the Operating System version only.

  1. Even though the physical CPU’s architecture may support 64-bit operations, the methods in my code will always return the architecture of the OS. So 32-bit Windows running on a 64-bit capable processor will return 32-bit.
  2. Even though the CPU is 64-bit capable, and the OS architecture is 64-bit, your .Net program could still be running as a 32-bit application. Sometimes, this information is more useful than knowing whether Windows is 32- or 64-bit. To see if your program is actually running in 64-bit mode, check to see if IntPtr.Size == 8. It will be 4 in 32-bit mode and 8 in 64-bit mode.

Possibly Related posts:

  1. C# Detect Windows OS Version - Part 1
  2. RFC Standard for the transmission of IP datagrams on Avian Carriers
  3. Install Ejabberd 2.0 on Ubuntu Hardy Heron 8.04 LTS - 6 Steps!

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C# Detect Windows OS Version - Part 1 http://andrewensley.com/2009/06/c-detect-windows-os-part-1/ http://andrewensley.com/2009/06/c-detect-windows-os-part-1/#comments Tue, 23 Jun 2009 03:29:58 +0000 Andrew http://andrewensley.com/?p=112

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After reading this, check out Part 2: Using WMI for even more info

Introduction

I recently needed to programmatically determine the Operating System my software is running on.  I was amazed at how difficult it was to find reliable, useful information on this subject.  There were bits and pieces here and there, but almost everyone assumed I had some pre-existing knowledge of the process in one manner or another.  Hopefully, this little series will save somebody some time in the future.

The thing that makes this so difficult is that there are almost as many different ways to detect the operating system as there are operating systems!  It's an unbelievably frustrating experience trying to reinvent this wheel, so I'll try to walk through it here.

Strategies

There are 4 basic strategies:

  1. Read and parse information from files in the Windows directory.  This is probably the most difficult and least rewarding method.  The files are different for each generation of OS and the format is not guaranteed in almost any case.
  2. Read information from the registry.  This method works a little better, but you still have varying locations for the information based on which OS you're dealing with.
  3. Use Environment variables.  Nothing is more reliable.  However, it doesn't give you the nitty-gritty detail you might want.  For example: There's no way to detect XP Home vs. XP Professional.
  4. Use WMI to query for information about the OS.  This gives you everything you could possibly want all in one shot.  Unfortunately, it's not supported in pre-NT versions of Windows (of course, this is becoming less and less of a problem).

I started with number 1.  After pulling most of my hair out and wanting to punch my keyboard, I moved on to number 2.  That was a dead end too.  I could have made it work, but I didn't have the patience.  I gave number 3 a try and was very happy...  ...until I decided that the specific version of 2000, XP, Vista, and 7 mattered to me.  So I finally ended up with a combination of 3 and 4.

For part 1 of this series, I'm going to focus on number 3, a.k.a. The Easy Waytm

The Code

The key to everything is the Environment class.  It has everything we need in a property called OSVersion.  However, the information is a little cryptic (mostly a bunch of numbers), so it takes some work to get a "friendly" value returned.

This first method gives us the Operating system architecture as an integer. The environment variable "PROCESSOR_ARCHITECTURE" is either set to "x86" or doesn't exist on 32-bit versions of Windows. It's always set to something other than "x86" on 64-bit versions of Windows.

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int getOSArchitecture()
{
    string pa = Environment.GetEnvironmentVariable("PROCESSOR_ARCHITECTURE");
    return ((String.IsNullOrEmpty(pa) || String.Compare(pa, 0, "x86", 0, 3, true) == 0) ? 32 : 64);
}

For something that seems so simple, this can actually be very confusing. There are two important notes about this method:

  1. Even though the physical CPU's architecture may support 64-bit operations, this environment variable will always return the architecture of the OS. So 32-bit Windows running on a 64-bit capable processor will return 32-bit. It's a bit of a misnomer, but provides the information we really want anyway.
  2. Even though the CPU is 64-bit capable, and the OS architecture is 64-bit, your .Net program could still be running as a 32-bit application. Sometimes, this information is more useful than knowing whether Windows is 32- or 64-bit. To see if your program is actually running in 64-bit mode, check to see if IntPtr.Size == 8. It will be 4 in 32-bit mode and 8 in 64-bit mode.

Now onto the actual Operating System version. The following code is largely based on what I found on the Microsoft Knowledge Base article: How to determine the Windows version by using Visual C#.

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string getOSInfo()
{
    //Get Operating system information.
    OperatingSystem os = Environment.OSVersion;
    //Get version information about the os.
    Version vs = os.Version;

    //Variable to hold our return value
    string operatingSystem = "";

    if (os.Platform == PlatformID.Win32Windows)
    {
        //This is a pre-NT version of Windows
        switch (vs.Minor)
        {
            case 0:
                operatingSystem = "95";
                break;
            case 10:
                if (vs.Revision.ToString() == "2222A")
                    operatingSystem = "98SE";
                else
                    operatingSystem = "98";
                break;
            case 90:
                operatingSystem = "Me";
                break;
            default:
                break;
        }
    }
    else if (os.Platform == PlatformID.Win32NT)
    {
        switch (vs.Major)
        {
            case 3:
                operatingSystem = "NT 3.51";
                break;
            case 4:
                operatingSystem = "NT 4.0";
                break;
            case 5:
                if (vs.Minor == 0)
                    operatingSystem = "2000";
                else
                    operatingSystem = "XP";
                break;
            case 6:
                if (vs.Minor == 0)
                    operatingSystem = "Vista";
                else
                    operatingSystem = "7";
                break;
            default:
                break;
        }
    }
    //Make sure we actually got something in our OS check
    //We don't want to just return " Service Pack 2" or " 32-bit"
    //That information is useless without the OS version.
    if (operatingSystem != "")
    {
        //Got something.  Let's prepend "Windows" and get more info.
        operatingSystem = "Windows " + operatingSystem;
        //See if there's a service pack installed.
        if (os.ServicePack != "")
        {
            //Append it to the OS name.  i.e. "Windows XP Service Pack 3"
            operatingSystem += " " + os.ServicePack;
        }
        //Append the OS architecture.  i.e. "Windows XP Service Pack 3 32-bit"
        operatingSystem += " " + getOSArchitecture().ToString() + "-bit";
    }
    //Return the information we've gathered.
    return operatingSystem;
}

Notice that getOSInfo() returns an empty string if it was unable to determine the OS version.

The code should be pretty self-explanatory, and the great thing is that you don't have to reference any special assemblies. Everything is right there in System.

Want even more information? Don't miss Part 2: Using WMI

Possibly Related posts:

  1. C# Detect Windows OS Version – Part 2 (WMI)

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