private PrinterNotifyInfoData GetInfoData(int index)
{
// Need to figure out where the location must be set in order to find PrinterNotifyInfoData objects.
// This location can be subtly different based on what bitness the OS is running.
// For this reason, the true "size" of object is the marshal size, plus however many bytes gets us
// to the next memory boundary. The size of IntPtr indicates what the memory boundary is for the given OS.
int sizeOfInfo = Marshal.SizeOf <PrinterNotifyInfo>();
sizeOfInfo += (sizeOfInfo % Marshal.SizeOf <IntPtr>());
int sizeOfData = Marshal.SizeOf <PrinterNotifyInfoData>();
sizeOfData += (sizeOfData % Marshal.SizeOf <IntPtr>());
long location = _infoHandle.DangerousGetHandle().ToInt64() + sizeOfInfo + (sizeOfData * index);
return(Marshal.PtrToStructure <PrinterNotifyInfoData>(new IntPtr(location)));
}
/// <summary>
/// Initializes a new instance of the <see cref="PrinterNotifyInfoReader"/> class.
/// </summary>
/// <param name="infoHandle">The handle to a <see cref="PrinterNotifyInfo" />.</param>
public PrinterNotifyInfoReader(SafePrinterNotifyInfoHandle infoHandle)
{
_infoHandle = infoHandle;
Info = Marshal.PtrToStructure <PrinterNotifyInfo>(infoHandle.DangerousGetHandle());
}