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unit DirectRTF;

interface

uses
  Windows, Types, Classes,  RichEdit, RxRichEd;

// Stream Callback function
type
  TEditStreamCallBack = function(dwCookie: Longint; pbBuff: PByte;
    cb: Longint; var pcb: Longint): DWORD;
  stdcall;

  TEditStream = record
    dwCookie: Longint;
    dwError: Longint;
    pfnCallback: TEditStreamCallBack;
  end;

// RichEdit Type
type
  TMyRichEdit = TRxRichEdit;

function EditStreamInCallback(dwCookie: Longint; pbBuff: PByte;
  cb: Longint; var pcb: Longint): DWORD; stdcall;
procedure PutRTFSelection(RichEdit: TMyRichEdit; SourceStream: TStream);

implementation

// EditStreamInCallback callback function
function EditStreamInCallback(dwCookie: Longint; pbBuff: PByte;
  cb: Longint; var pcb: Longint): DWORD; stdcall;
  // by P. Below
var
  theStream: TStream;
  dataAvail: LongInt;
begin
  theStream := TStream(dwCookie);
  with theStream do
  begin
    dataAvail := Size - Position;
    Result := 0;
    if dataAvail <= cb then
    begin
      pcb := read(pbBuff^, dataAvail);
      if pcb <> dataAvail then
        Result := UINT(E_FAIL);
    end 
    else 
    begin 
      pcb := read(pbBuff^, cb); 
      if pcb <> cb then 
        Result := UINT(E_FAIL); 
    end; 
  end; 
end; 

// Insert Stream into RichEdit 
procedure PutRTFSelection(RichEdit: TMyRichEdit; SourceStream: TStream);
  // by P. Below
var
  EditStream: TEditStream;
begin
  with EditStream do
  begin
    dwCookie := Longint(SourceStream);
    dwError := 0;
    pfnCallback := EditStreamInCallBack;
  end;
  RichEdit.Perform(EM_STREAMIN, SF_RTF or SFF_SELECTION, Longint(@EditStream));
end;

end.                    

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procedure TMainForm.ManuellerWechsel1Click(Sender: TObject);
  var Child : TForm;
      SS    : TStringStream;
      Pt    : integer;
begin
  Child := MainForm.ActiveMDIChild;
  with (Child as TMDIChild) do begin
    if Editor.SelStart < Length(Editor.Text) then
      SS := TStringStream.Create('{\rtf1\par\page}')
    else
      SS := TStringStream.Create('{\rtf1\par\page\par}');
  end;
  try
    //Jetzt wird der RTF-Text eingefügt
    PutRTFSelection((Child as TMDIChild).Editor, SS);
  finally
    SS.Free
  end;
  Pt := (Child as TMDIChild).Editor.SelStart;
  PageBreaks(true);
  (Child as TMDIChild).Editor.SelStart := Pt+Length(PAGETEXT)
end;                    

1:

RichEdit1.SelText := 'bla';