// Jordi Mas i Hernandez, jordimash@gmail.com
//
-using System.Runtime.InteropServices;
using System.Collections;
-using System.Drawing.Printing;
-using System.ComponentModel;
-using System.Drawing.Imaging;
-using System.Diagnostics;
-using System.Text;
-using System.IO;
+using System.Collections.Generic;
using System.Collections.Specialized;
+using System.IO;
+using System.Runtime.InteropServices;
+using System.Text;
+using System.Threading;
using Gdip = System.Drawing.SafeNativeMethods.Gdip;
namespace System.Drawing.Printing
{
#region Private Fields
- private static readonly Hashtable doc_info = new Hashtable();
- private static readonly bool cups_installed = CheckCupsInstalled();
- private static readonly Hashtable installed_printers = new Hashtable();
- private static string default_printer = string.Empty;
+ private static readonly bool s_cupsInitialized = CheckCupsInstalled();
+ private static readonly Hashtable s_docInfo = Hashtable.Synchronized(new Hashtable());
+ private static Tuple<string, Dictionary<string, SysPrn.Printer>> s_printers; // cached default printer name and collection of all printers from cups
#endregion
{
get
{
- LoadPrinters();
- PrinterSettings.StringCollection list = new PrinterSettings.StringCollection(Array.Empty<string>());
- foreach (object key in installed_printers.Keys)
+ Volatile.Write(ref s_printers, null); // clear cache to match Windows behavior
+
+ var list = new PrinterSettings.StringCollection(Array.Empty<string>());
+
+ foreach (KeyValuePair<string, SysPrn.Printer> key in EnsurePrintersInitialized().Item2)
{
- list.Add(key.ToString());
+ list.Add(key.Key);
}
+
return list;
}
}
- internal static string DefaultPrinter
- {
- get
- {
- if (installed_printers.Count == 0)
- LoadPrinters();
- return default_printer;
- }
- }
+ internal static string DefaultPrinter => EnsurePrintersInitialized().Item1;
#endregion
}
/// <summary>
- /// Checks if a printer has a valid PPD file. Caches the result unless force is true
+ /// Checks if a printer has a valid PPD file.
/// </summary>
/// <param name="printer">Printer name</param>
- internal static bool IsPrinterValid(string printer)
- {
- if (!cups_installed || printer == null | printer == string.Empty)
- return false;
-
- return installed_printers.Contains(printer);
- }
+ internal static bool IsPrinterValid(string printer) =>
+ s_cupsInitialized &&
+ !string.IsNullOrEmpty(printer) &&
+ EnsurePrintersInitialized().Item2.ContainsKey(printer);
/// <summary>
/// Loads the printer settings and initializes the PrinterSettings and PageSettings fields
/// <param name="settings">PrinterSettings object to initialize</param>
internal static void LoadPrinterSettings(string printer, PrinterSettings settings)
{
- if (cups_installed == false || (printer == null) || (printer == string.Empty))
+ if (!s_cupsInitialized || string.IsNullOrEmpty(printer))
return;
- if (installed_printers.Count == 0)
- LoadPrinters();
+ Dictionary<string, SysPrn.Printer> printers = EnsurePrintersInitialized().Item2;
+
+ if (!printers.TryGetValue(printer, out SysPrn.Printer p))
+ return;
- if (((SysPrn.Printer)installed_printers[printer]).Settings != null)
+ PrinterSettings currentSettings = p.Settings;
+ if (currentSettings != null)
{
- SysPrn.Printer p = (SysPrn.Printer)installed_printers[printer];
- settings.can_duplex = p.Settings.can_duplex;
- settings.is_plotter = p.Settings.is_plotter;
- settings.landscape_angle = p.Settings.landscape_angle;
- settings.maximum_copies = p.Settings.maximum_copies;
- settings.paper_sizes = p.Settings.paper_sizes;
- settings.paper_sources = p.Settings.paper_sources;
- settings.printer_capabilities = p.Settings.printer_capabilities;
- settings.printer_resolutions = p.Settings.printer_resolutions;
- settings.supports_color = p.Settings.supports_color;
+ settings.can_duplex = currentSettings.can_duplex;
+ settings.is_plotter = currentSettings.is_plotter;
+ settings.landscape_angle = currentSettings.landscape_angle;
+ settings.maximum_copies = currentSettings.maximum_copies;
+ settings.paper_sizes = currentSettings.paper_sizes;
+ settings.paper_sources = currentSettings.paper_sources;
+ settings.printer_capabilities = currentSettings.printer_capabilities;
+ settings.printer_resolutions = currentSettings.printer_resolutions;
+ settings.supports_color = currentSettings.supports_color;
return;
}
ClosePrinter(ref ppd_handle);
- ((SysPrn.Printer)installed_printers[printer]).Settings = settings;
+ p.Settings = settings;
}
finally
{
/// <summary>
/// </summary>
- private static void LoadPrinters()
- {
- installed_printers.Clear();
- if (cups_installed == false)
- return;
-
- IntPtr dests = IntPtr.Zero, ptr_printers;
- CUPS_DESTS printer;
- int n_printers = 0;
- int cups_dests_size = Marshal.SizeOf(typeof(CUPS_DESTS));
- string name, first, type, status, comment;
- first = type = status = comment = string.Empty;
- int state = 0;
-
- try
+ private static Tuple<string, Dictionary<string, SysPrn.Printer>> EnsurePrintersInitialized() =>
+ LazyInitializer.EnsureInitialized(ref s_printers, () =>
{
- n_printers = OpenDests(ref dests);
+ string defaultPrinterName = string.Empty;
+ var printers = new Dictionary<string, SysPrn.Printer>();
- ptr_printers = dests;
- for (int i = 0; i < n_printers; i++)
+ if (s_cupsInitialized)
{
- printer = (CUPS_DESTS)Marshal.PtrToStructure(ptr_printers, typeof(CUPS_DESTS));
- name = Marshal.PtrToStringAnsi(printer.name);
-
- if (printer.is_default == 1)
- default_printer = name;
+ IntPtr dests = IntPtr.Zero;
+ int n_printers = 0;
- if (first.Equals(string.Empty))
- first = name;
-
- NameValueCollection options = LoadPrinterOptions(printer.options, printer.num_options);
-
- if (options["printer-state"] != null)
- state = int.Parse(options["printer-state"]);
-
- if (options["printer-comment"] != null)
- comment = options["printer-state"];
-
- switch (state)
+ try
{
- case 4:
- status = "Printing";
- break;
- case 5:
- status = "Stopped";
- break;
- default:
- status = "Ready";
- break;
+ n_printers = OpenDests(ref dests);
+
+ IntPtr ptr_printers = dests;
+ for (int i = 0; i < n_printers; i++)
+ {
+ var printer = (CUPS_DESTS)Marshal.PtrToStructure(ptr_printers, typeof(CUPS_DESTS));
+ string name = Marshal.PtrToStringAnsi(printer.name);
+
+ if (printer.is_default == 1 ||
+ string.IsNullOrEmpty(defaultPrinterName))
+ {
+ defaultPrinterName = name;
+ }
+
+ NameValueCollection options = LoadPrinterOptions(printer.options, printer.num_options);
+
+ string status;
+ int.TryParse(options["printer-state"], out int state);
+ switch (state)
+ {
+ case 4:
+ status = "Printing";
+ break;
+ case 5:
+ status = "Stopped";
+ break;
+ default:
+ status = "Ready";
+ break;
+ }
+
+ string comment = options["printer-comment"] as string ?? string.Empty;
+
+ printers.Add(name, new SysPrn.Printer(string.Empty, string.Empty, status, comment));
+ ptr_printers = (IntPtr)((long)ptr_printers + Marshal.SizeOf(typeof(CUPS_DESTS)));
+ }
+ }
+ finally
+ {
+ CloseDests(ref dests, n_printers);
}
-
- installed_printers.Add(name, new SysPrn.Printer(string.Empty, type, status, comment));
-
- ptr_printers = (IntPtr)((long)ptr_printers + cups_dests_size);
}
- }
- finally
- {
- CloseDests(ref dests, n_printers);
- }
-
- if (default_printer.Equals(string.Empty))
- default_printer = first;
- }
+ return Tuple.Create(defaultPrinterName, printers);
+ });
/// <summary>
/// Gets a printer's settings for use in the print dialogue
IntPtr dests = IntPtr.Zero, ptr_printers, ptr_printer;
int cups_dests_size = Marshal.SizeOf(typeof(CUPS_DESTS));
- if (cups_installed == false)
+ if (!s_cupsInitialized)
return;
try
internal static bool StartDoc(GraphicsPrinter gr, string doc_name, string output_file)
{
- DOCINFO doc = (DOCINFO)doc_info[gr.Hdc];
+ DOCINFO doc = (DOCINFO)s_docInfo[gr.Hdc];
doc.title = doc_name;
return true;
}
internal static bool EndDoc(GraphicsPrinter gr)
{
- DOCINFO doc = (DOCINFO)doc_info[gr.Hdc];
+ DOCINFO doc = (DOCINFO)s_docInfo[gr.Hdc];
gr.Graphics.Dispose(); // Dispose object to force surface finish
LibcupsNative.cupsPrintFile(doc.settings.PrinterName, doc.filename, doc.title, options_count, options);
LibcupsNative.cupsFreeOptions(options_count, options);
- doc_info.Remove(gr.Hdc);
+ s_docInfo.Remove(gr.Hdc);
if (tmpfile != null)
{
try
doc.filename = name;
doc.settings = settings;
doc.default_page_settings = default_page_settings;
- doc_info.Add(graphics, doc);
+ s_docInfo.Add(graphics, doc);
return graphics;
}
projects / platform / upstream / dotnet / runtime.git / commitdiff