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;
}
