/// <summary>
/// Size or fill-in a RECONVERTSTRING structure that contains the selection (with padding)
/// </summary>
public static IntPtr ReconvertString(IntPtr lParam, SnapshotSpan selection)
{
SnapshotSpan selectionContext = GetSelectionContext(selection);
int sizeofRCS = Marshal.SizeOf(typeof(NativeMethods.RECONVERTSTRING));
if (lParam != IntPtr.Zero)
{
NativeMethods.RECONVERTSTRING reconvertString = (NativeMethods.RECONVERTSTRING)(Marshal.PtrToStructure(lParam, typeof(NativeMethods.RECONVERTSTRING)));
if (selection.Length >= ((reconvertString.dwSize - sizeofRCS) / 2))
{
//We didn't get space for all the characters we requested.
return(IntPtr.Zero);
}
Marshal.WriteInt32((IntPtr)((long)lParam + (long)Marshal.OffsetOf(typeof(NativeMethods.RECONVERTSTRING), "dwStrLen")), selectionContext.Length);
Marshal.WriteInt32((IntPtr)((long)lParam + (long)Marshal.OffsetOf(typeof(NativeMethods.RECONVERTSTRING), "dwStrOffset")), sizeofRCS);
Marshal.WriteInt32((IntPtr)((long)lParam + (long)Marshal.OffsetOf(typeof(NativeMethods.RECONVERTSTRING), "dwCompStrLen")), selection.Length);
Marshal.WriteInt32((IntPtr)((long)lParam + (long)Marshal.OffsetOf(typeof(NativeMethods.RECONVERTSTRING), "dwCompStrOffset")), (selection.Start.Position - selectionContext.Start.Position) * 2);
Marshal.WriteInt32((IntPtr)((long)lParam + (long)Marshal.OffsetOf(typeof(NativeMethods.RECONVERTSTRING), "dwTargetStrLen")), selection.Length);
Marshal.WriteInt32((IntPtr)((long)lParam + (long)Marshal.OffsetOf(typeof(NativeMethods.RECONVERTSTRING), "dwTargetStrOffset")), (selection.Start.Position - selectionContext.Start.Position) * 2);
Marshal.Copy(selection.Snapshot.GetText(selectionContext).ToCharArray(), 0, (IntPtr)((long)lParam + (long)sizeofRCS), selectionContext.Length);
Marshal.WriteInt16((IntPtr)((long)lParam + (long)(sizeofRCS + (selectionContext.Length * 2))), 0);
}
return(new IntPtr(sizeofRCS + ((selectionContext.Length + 1) * 2)));
}
/// <summary>
/// Generate a selection from a RECONVERTSTRING block.
/// </summary>
public static SnapshotSpan ConfirmReconvertString(IntPtr lParam, SnapshotSpan selection)
{
if (lParam != IntPtr.Zero)
{
SnapshotSpan selectionContext = GetSelectionContext(selection);
NativeMethods.RECONVERTSTRING reconvertString = (NativeMethods.RECONVERTSTRING)(Marshal.PtrToStructure(lParam, typeof(NativeMethods.RECONVERTSTRING)));
return(new SnapshotSpan(selectionContext.Start + (reconvertString.dwCompStrOffset / 2), reconvertString.dwCompStrLen));
}
return(new SnapshotSpan(selection.Snapshot, 0, 0));
}