void LoadPrinterPaperSizes(string printer, PrinterSettings settings) { int items, ret; IntPtr ptr_names, buff_names = IntPtr.Zero; IntPtr ptr_sizes, buff_sizes = IntPtr.Zero; IntPtr ptr_sizes_enum, buff_sizes_enum = IntPtr.Zero; string name; if (settings.PaperSizes == null) { settings.paper_sizes = new PrinterSettings.PaperSizeCollection(new PaperSize [0]); } else { settings.PaperSizes.Clear(); } items = Win32DeviceCapabilities(printer, null, DCCapabilities.DC_PAPERSIZE, IntPtr.Zero, IntPtr.Zero); if (items == -1) { return; } try { ptr_sizes = buff_sizes = Marshal.AllocHGlobal(items * 2 * 4); ptr_names = buff_names = Marshal.AllocHGlobal(items * 64 * 2); ptr_sizes_enum = buff_sizes_enum = Marshal.AllocHGlobal(items * 2); ret = Win32DeviceCapabilities(printer, null, DCCapabilities.DC_PAPERSIZE, buff_sizes, IntPtr.Zero); if (ret == -1) { // the finally clause will free the unmanaged memory before returning return; } ret = Win32DeviceCapabilities(printer, null, DCCapabilities.DC_PAPERS, buff_sizes_enum, IntPtr.Zero); ret = Win32DeviceCapabilities(printer, null, DCCapabilities.DC_PAPERNAMES, buff_names, IntPtr.Zero); int x, y; PaperSize ps; PaperKind kind; for (int i = 0; i < ret; i++) { x = Marshal.ReadInt32(ptr_sizes, i * 8); y = Marshal.ReadInt32(ptr_sizes, (i * 8) + 4); x = PrinterUnitConvert.Convert(x, PrinterUnit.TenthsOfAMillimeter, PrinterUnit.Display); y = PrinterUnitConvert.Convert(y, PrinterUnit.TenthsOfAMillimeter, PrinterUnit.Display); name = Marshal.PtrToStringUni(ptr_names); ptr_names = new IntPtr(ptr_names.ToInt64() + 64 * 2); kind = (PaperKind)Marshal.ReadInt16(ptr_sizes_enum); ptr_sizes_enum = new IntPtr(ptr_sizes_enum.ToInt64() + 2); ps = new PaperSize(name, x, y); ps.SetKind(kind); settings.PaperSizes.Add(ps); } } finally { if (buff_names != IntPtr.Zero) { Marshal.FreeHGlobal(buff_names); } if (buff_sizes != IntPtr.Zero) { Marshal.FreeHGlobal(buff_sizes); } if (buff_sizes_enum != IntPtr.Zero) { Marshal.FreeHGlobal(buff_sizes_enum); } } }
// used by PrinterSettings.DefaultPageSettings internal PageSettings(PrinterSettings printerSettings, bool color, bool landscape, PaperSize paperSize, PaperSource paperSource, PrinterResolution printerResolution) { PrinterSettings = printerSettings; this.color = color; this.landscape = landscape; this.paperSize = paperSize; this.paperSource = paperSource; this.printerResolution = printerResolution; }