Easy Desktop Web Stats

using System.Windows.Forms;
using System.Diagnostics;
using System.Text.RegularExpressions;
using Microsoft.Win32;

using MessageManager;

namespace Compatibility
{
    class VouchSafe
    {
        public delegate bool VouchSafeDelegate();
        public VouchSafeDelegate compatibility;

        private short compatibilityErrors;

        public VouchSafe()
        {
            // append methods to delegate;
            compatibility += Test_ForAlreadyRunning;
            compatibility += Test_ForDotNetVersion;
            compatibility += Test_ForWindowsProductName;
            compatibility += CompatibilityStatus;

            compatibilityErrors = 0;
        }
        
        private bool Test_ForAlreadyRunning()
        {
            DialogResult result;
            if (Process.GetProcessesByName(Process.GetCurrentProcess().ProcessName).Length > 1)
            {
                result = Dialog.Message("Error", 
                                        "The program is already running.",
                                         MessageBoxButtons.OK, MessageBoxIcon.Information);

                if (result == DialogResult.OK)
                {
                    compatibilityErrors++;                 
                }
            }
            return true;
        }

        private bool Test_ForDotNetVersion()
        {
            string framework;
            string versionStr = "";
            float version = 0;
            RegistryKey componentsKey = Registry.LocalMachine.OpenSubKey("SOFTWARE\\Microsoft\\Active Setup\\Installed Components");
            string[] subKeys = componentsKey.GetSubKeyNames();
            foreach (string subKey in subKeys)
            {
                RegistryKey key = componentsKey.OpenSubKey(subKey);
                framework = (string)key.GetValue(null); 
                if (framework != null  && framework.IndexOf(".NET Framework") != -1)
                {
                    versionStr = (string)key.GetValue("Version");
                }
            }
            versionStr = versionStr.Replace(",", ".");
            Regex rx = new Regex(@"^(\d+)(.+)$");
            versionStr = rx.Replace(versionStr, "$1");
            version = float.Parse(versionStr);       
   
            // this project targets version 4.0 of the .NET Client Profile
            // if necessary, modify the next block, to suit your project

            if (version < 4)
            {
                DialogResult result = Dialog.Message("Error",
                                        "Version 4.0 or better of the Microsoft .NET\nFramework Client Profile must be installed\nto use this program.",
                                         MessageBoxButtons.OK, MessageBoxIcon.Information);

                if (result == DialogResult.OK)
                {
                    compatibilityErrors++;                                     
                }
            }
            return true;
        }

        private bool Test_ForWindowsProductName()
        {
            DialogResult result;
            RegistryKey hkey = Registry.LocalMachine;
            RegistryKey productNameKey = hkey.OpenSubKey("SOFTWARE\\Microsoft\\Windows NT\\CurrentVersion");
            string productName = (string)productNameKey.GetValue("ProductName").ToString();
            if (productName.IndexOf("Windows 8") != -1)
            {
                return true;
            }
            if (productName.IndexOf("Windows 7") != -1)
            {
                return true;
            }
            if (productName.IndexOf("Vista") != -1)
            {
                return true;
            }

            result = Dialog.Message("Error", 
                                    "You need Windows 7, 8 or Vista\nto use this program.",
                                     MessageBoxButtons.OK, MessageBoxIcon.Information);

            if (result == DialogResult.OK)
            {
                compatibilityErrors++;                 
            }
            return true;
        }

        private bool CompatibilityStatus()
        {
            if (compatibilityErrors != 0)
            {
                return false;
            }
            return true;
        }
    }    
}