/// <summary>
/// Close the printer file
/// </summary>
/// <param name="handle">PPD handle</param>
private static void ClosePrinter(ref IntPtr handle)
{
try
{
if (handle != IntPtr.Zero)
{
LibcupsNative.ppdClose(handle);
}
}
finally
{
handle = IntPtr.Zero;
}
}
/// <summary>
/// Do a cups call to check if it is installed
/// </summary>
private static bool CheckCupsInstalled()
{
try
{
LibcupsNative.cupsGetDefault();
}
catch (DllNotFoundException)
{
System.Diagnostics.Debug.WriteLine("libcups not found. To have printing support, you need cups installed");
return(false);
}
return(true);
}
private static void CloseDests(ref IntPtr ptr, int count)
{
try
{
if (ptr != IntPtr.Zero)
{
LibcupsNative.cupsFreeDests(count, ptr);
}
}
finally
{
ptr = IntPtr.Zero;
}
}
/// <summary>
/// Open the printer's PPD file
/// </summary>
/// <param name="printer">Printer name, returned from cupsGetDests</param>
private static IntPtr OpenPrinter(string printer)
{
try
{
IntPtr ptr = LibcupsNative.cupsGetPPD(printer);
string ppd_filename = Marshal.PtrToStringAnsi(ptr) !;
IntPtr ppd_handle = LibcupsNative.ppdOpenFile(ppd_filename);
return(ppd_handle);
}
catch (Exception)
{
System.Diagnostics.Debug.WriteLine("There was an error opening the printer {0}. Please check your cups installation.");
}
return(IntPtr.Zero);
}
// Unfortunately, PrinterSettings and PageSettings couldn't be referencing each other,
// thus we need to pass them separately
internal static IntPtr CreateGraphicsContext(PrinterSettings settings, PageSettings default_page_settings)
{
IntPtr graphics = IntPtr.Zero;
string name;
if (!settings.PrintToFile)
{
StringBuilder sb = new StringBuilder(1024);
int length = sb.Capacity;
LibcupsNative.cupsTempFd(sb, length);
name = sb.ToString();
tmpfile = name;
}
else
{
name = settings.PrintFileName;
}
PaperSize psize = default_page_settings.PaperSize;
int width, height;
if (default_page_settings.Landscape)
{ // Swap in case of landscape
width = psize.Height;
height = psize.Width;
}
else
{
width = psize.Width;
height = psize.Height;
}
Gdip.GdipGetPostScriptGraphicsContext(name,
width * 72 / 100,
height * 72 / 100,
default_page_settings.PrinterResolution.X,
default_page_settings.PrinterResolution.Y, ref graphics);
DOCINFO doc = default;
doc.filename = name;
doc.settings = settings;
doc.default_page_settings = default_page_settings;
doc_info.Add(graphics, doc);
return(graphics);
}
/// <summary>
/// Do a cups call to check if it is installed
/// </summary>
private static void CheckCupsInstalled()
{
try
{
LibcupsNative.cupsGetDefault();
}
catch (DllNotFoundException)
{
#if NETCORE
System.Diagnostics.Debug.WriteLine("libcups not found. To have printing support, you need cups installed");
#else
Console.WriteLine("libcups not found. To have printing support, you need cups installed");
#endif
cups_installed = false;
return;
}
cups_installed = true;
}
internal static bool EndDoc(GraphicsPrinter gr)
{
DOCINFO doc = (DOCINFO)doc_info[gr.Hdc];
gr.Graphics.Dispose(); // Dispose object to force surface finish
IntPtr options;
int options_count = GetCupsOptions(doc.settings, doc.default_page_settings, out options);
LibcupsNative.cupsPrintFile(doc.settings.PrinterName, doc.filename, doc.title, options_count, options);
LibcupsNative.cupsFreeOptions(options_count, options);
doc_info.Remove(gr.Hdc);
if (tmpfile != null)
{
try
{ File.Delete(tmpfile); }
catch { }
}
return(true);
}
