/// <summary>
/// Sets the printer attributes for the specified print queue to the specified value.
/// </summary>
/// <param name="queue">The <see cref="PrintQueue" /> to modify.</param>
/// <param name="attributes">The <see cref="PrintQueueAttributes" />.</param>
/// <remarks>
/// Print queue attributes can be retrieved (read-only) from a property on the <see cref="PrintQueue" /> object.
/// This is why there is no symmetrical "GetPrinterAttributes" method.
/// </remarks>
internal static void SetPrinterAttributes(PrintQueue queue, PrintQueueAttributes attributes)
{
RegistryKey printer = Registry.LocalMachine.OpenSubKey(_printersSubKey).OpenSubKey(queue.FullName, true);
printer.SetValue("Attributes", (int)attributes);
printer.Close();
}
/// <summary>
/// Changes the attributes of the specified print queue.
/// </summary>
/// <param name="printQueue">The <see cref="PrintQueue" /> to modify.</param>
/// <param name="attributes">The attributes to modify.</param>
/// <param name="setAttributes">if set to <c>true</c> add the specified attributes; otherwise, remove those attributes.</param>
/// <exception cref="ArgumentNullException"><paramref name="printQueue" /> is null.</exception>
public static void ChangeAttributes(PrintQueue printQueue, PrintQueueAttributes attributes, bool setAttributes)
{
if (printQueue == null)
{
throw new ArgumentNullException(nameof(printQueue));
}
PrintQueueAttributes originalAttributes = printQueue.QueueAttributes;
PrintQueueAttributes modifiedAttributes = setAttributes ?
originalAttributes | attributes :
originalAttributes & ~attributes;
if (modifiedAttributes != originalAttributes)
{
PrintRegistryUtil.SetPrinterAttributes(printQueue, modifiedAttributes);
// The print spooler must be restarted for this change to take effect.
PrintSpooler.RestartSpooler();
}
}
