Extract icons of Installed Windows Application using C#. NET

Icon of Installed Windows Applications

First we need to figure out the location of icon for the installed windows application. This information is stored in registry at following locations -
1. Key name - HEKY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Uninstall
   Value    - DisplayIcon

2. Key name - HKEY_CLASSES_ROOT\Installer\Products\{productID}
   Value - ProductIcon


first try to get location of icon from HEKY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Uninstall. Here if the value of DisplayIcon is null then try to fetch location of icon from HKEY_CLASSES_ROOT\Installer\Products\{productID}


Here is the sample code to read the icon -

CodeProject

using system.Drawing

//read HKEY_LOCAL_MACHINE

Icon ProductIcon;

private void ReadIcon()
{
   try
   {
   string uninstallKey = @"SOFTWARE\Microsoft\Windows\CurrentVersion\Uninstall";
                using (RegistryKey rk = Registry.LocalMachine.OpenSubKey(uninstallKey))
                {
                    foreach (string skName in rk.GetSubKeyNames())
                    {
                        using (RegistryKey sk = rk.OpenSubKey(skName))
                        {
                            try
                            {
                                if (sk.GetValue("DisplayName") != null)
                                {

                                    if (sk.GetValue("DisplayIcon") != null)
                                    {
                  ProductIcon = Icon.ExtractAssociatedIcon(sk.GetValue("DisplayIcon").ToString());
                                    }
                                    else
                                    {
                                        //get icon from HKEY_CLASSES_ROOT
                                   ProductIcon = GetIconForRoot(sk.GetValue("DisplayName").ToString());
                                    }
                                }
                            }
                            catch (Exception ex)
                            {
                              MessageBox.Show(ex.Message);
                            }
                     }
               }
    }
    catch(Exception ex)
    {
      MessageBox.Show(ex.Message);
    }
}

  private Icon GetIconForRoot(string productName)
  {
            string producticon = "";
            string InstallerKey = @"Installer\Products";
            using (RegistryKey installkeys = Registry.ClassesRoot.OpenSubKey(InstallerKey))
            {
                foreach (string name in installkeys.GetSubKeyNames())
                {
                    using (RegistryKey product = installkeys.OpenSubKey(name))
                    {
                        if (product.GetValue("ProductName") != null)
                        {
                            if (productName == product.GetValue("ProductName").ToString())
                            {
                                if (product.GetValue("ProductIcon") != null)
                                {
                                    producticon = product.GetValue("ProductIcon").ToString();

                                }
                            }
                        }
                    }
                }
            }
            if (Icon.ExtractAssociatedIcon(producticon) != null)
                return Icon.ExtractAssociatedIcon(producticon);
            else
                return null;
  }