///<summary>
/// Obtain a DEVMODE from a printer
///</summary>
///<param name="pHandle">Printer handle</param>
///<param name="baseType">Type of DEVMODE (printer default or user default)</param>
///<param name="devModeBytes">DEVMODE bytes</param>
///<returns>False if the call fails</returns>
private DevMode GetDEVMODE(BaseDevModeType baseType)
{
DevMode result;
switch (baseType)
{
case BaseDevModeType.PrinterDefault:
{
PRINTER_INFO_2 info = GetPrinterInfo2W();
result = info.pDevMode;
break;
}
case BaseDevModeType.UserDefault:
{
PRINTER_INFO_8_AND_9 info = GetPrinterInfo8Or9W(true);
if (info.pDevMode != null)
{
result = info.pDevMode;
}
else
{
// No user default devmode, try the printer default, which is
// effectively the user default if their isn't a per user default
// overriding it.
result = GetDEVMODE(BaseDevModeType.PrinterDefault);
}
break;
}
default:
{
throw new ArgumentOutOfRangeException("baseType");
}
}
if (result == null)
{
throw new PrintSystemException();
}
return(result);
}
/// <summary>
/// A callback that copies PRINTER_INFO_8_AND_9 fields from an unmanaged buffer
/// </summary>
public void Callback(HGlobalBuffer pPrinterBuffer)
{
// PRINTER_INFO_8 layout from http://msdn.microsoft.com/en-us/library/dd162851(VS.85).aspx
//
// typedef struct _PRINTER_INFO_8 {
// LPDEVMODE pDevMode;
// } PRINTER_INFO_8, *PPRINTER_INFO_8;
//
// PRINTER_INFO_9 layout from http://msdn.microsoft.com/en-us/library/dd162852(VS.85).aspx
//
// typedef struct _PRINTER_INFO_9 {
// LPDEVMODE pDevMode;
// } PRINTER_INFO_9, *PPRINTER_INFO_9;
// LPDEVMODE pDevMode;
PRINTER_INFO_8_AND_9 = new PRINTER_INFO_8_AND_9();
bool shouldRelease = false;
pPrinterBuffer.Handle.DangerousAddRef(ref shouldRelease);
try
{
IntPtr pDevMode = Marshal.ReadIntPtr(pPrinterBuffer.Handle.DangerousGetHandle());
if (pDevMode != IntPtr.Zero)
{
PRINTER_INFO_8_AND_9.pDevMode = DevMode.FromIntPtr(pDevMode);
}
}
finally
{
if (shouldRelease)
{
pPrinterBuffer.Handle.DangerousRelease();
}
}
}
