ExtractPrintDataAndDevMode(
IntPtr unmanagedBuffer,
out string printerName,
out UInt32 flags,
out PageRange pageRange,
out IntPtr devModeHandle
)
{
IntPtr devNamesHandle = IntPtr.Zero;
IntPtr pageRangePtr = IntPtr.Zero;
//
// Extract the devmode and devnames handles from the appropriate PRINTDLGEX structure
//
if (!Is64Bit())
{
NativeMethods.PRINTDLGEX32 pdex = (NativeMethods.PRINTDLGEX32)Marshal.PtrToStructure(
unmanagedBuffer,
typeof(NativeMethods.PRINTDLGEX32));
devModeHandle = pdex.hDevMode;
devNamesHandle = pdex.hDevNames;
flags = pdex.Flags;
pageRangePtr = pdex.lpPageRanges;
}
else
{
NativeMethods.PRINTDLGEX64 pdex = (NativeMethods.PRINTDLGEX64)Marshal.PtrToStructure(
unmanagedBuffer,
typeof(NativeMethods.PRINTDLGEX64));
devModeHandle = pdex.hDevMode;
devNamesHandle = pdex.hDevNames;
flags = pdex.Flags;
pageRangePtr = pdex.lpPageRanges;
}
//
// Get a managed copy of the page ranges. This only matters if the PD_PAGENUMS bit is
// set in the flags.
//
if (((flags & NativeMethods.PD_PAGENUMS) == NativeMethods.PD_PAGENUMS) &&
(pageRangePtr != IntPtr.Zero))
{
NativeMethods.PRINTPAGERANGE pageRangeStruct = (NativeMethods.PRINTPAGERANGE)Marshal.PtrToStructure(
pageRangePtr,
typeof(NativeMethods.PRINTPAGERANGE));
pageRange = new PageRange((int)pageRangeStruct.nFromPage, (int)pageRangeStruct.nToPage);
}
else
{
pageRange = new PageRange(1);
}
//
// Get a managed copy of the device name
//
if (devNamesHandle != IntPtr.Zero)
{
IntPtr pDevNames = IntPtr.Zero;
try
{
pDevNames = UnsafeNativeMethods.GlobalLock(devNamesHandle);
NativeMethods.DEVNAMES devNames = (NativeMethods.DEVNAMES)Marshal.PtrToStructure(
pDevNames,
typeof(NativeMethods.DEVNAMES));
int devNamesOffset = checked (devNames.wDeviceOffset * Marshal.SystemDefaultCharSize);
printerName = Marshal.PtrToStringAuto(pDevNames + devNamesOffset);
}
finally
{
if (pDevNames != IntPtr.Zero)
{
UnsafeNativeMethods.GlobalUnlock(devNamesHandle);
}
}
}
else
{
printerName = string.Empty;
}
}
