Question

我是delphi的新手，我正试图弄清楚如何从一个richtextbox加载特定行（而不是完整的文本）到另一个。

procedure TForm1.richedit1change(Sender: TObject);
var
  ms: TMemoryStream;
begin
  ms := TMemoryStream.Create;
  try
    RichEdit1.Lines.SaveToStream(ms);
    ms.Seek(0, soFromBeginning);

    RichEdit2.Lines.LoadFromStream(ms);
  finally
    ms.Free;
  end;
end;

Answer 1

您不需要使用流将文本行从一个TRichEdit传输到另一个Lines。只需使用Lines属性即可。 TRichEdit类型为TStrings，因此请使用其方法操作procedure TForm1.richedit1change(Sender: TObject); var i: Integer; begin RichEdit2.Lines.Clear; for i := 0 to Pred(RichEdit1.Lines.Count) do begin if YourSpecificTestFunction(i) then RichEdit2.Lines.Add(RichEdit1.Lines[i]); end; end;文本。

procedure CopyRichEditSelection(Source,Dest: TRichEdit);
begin
  // Copy Source.Selection to Dest via ClipBoard.
  Dest.Clear;
  if (Source.SelLength > 0) then
  begin
    Source.CopyToClipboard;        
    Dest.PasteFromClipboard;
  end;
end;

如果要保留RTF格式，可以使用Zarko Gajic，Append or Insert RTF from one RichEdit to Another描述的技术。

另一个简单的选择是使用Windows剪贴板和TRichEdit.Selection：

TRichEdit.SelStart

这也将保留您的格式，复制所选部分。

如果要在没有用户控制的情况下控制选择，请使用SelLength将插入符号放置到选择开始的字符处，并选择RichEdit1.SelStart := RichEdit1.Perform(EM_LINEINDEX, Line, 0);作为选择长度。要将插入符号放在特定行上，请使用：

Uses RichEdit;

function EditStreamOutCallback(dwCookie: DWORD_PTR; pbBuff: PByte; cb: Longint;
  var pcb: LongInt): LongInt; stdcall;
begin
  pcb := cb;
  if cb > 0 then
  begin
    TStream(dwCookie).WriteBuffer(pbBuff^, cb);
    Result := 0;
  end
  else
    Result := 1;
end;

procedure GetRTFSelection(aRichEdit: TRichEdit; intoStream: TStream);
type
  TEditStreamCallBack = function (dwCookie: DWORD_PTR; pbBuff: PByte;
    cb: Longint; var pcb: Longint): Longint; stdcall;

  TEditStream = packed record // <-- Note packed !!
    dwCookie: DWORD_PTR;
    dwError: Longint;
    pfnCallback: TEditStreamCallBack;
  end;

var
  editstream: TEditStream;
begin
  with editstream do
  begin
    dwCookie := DWORD_PTR(intoStream);
    dwError := 0;
    pfnCallback := EditStreamOutCallBack;
  end;
  aRichedit.Perform( EM_STREAMOUT, SF_RTF or SFF_SELECTION, LPARAM(@editstream));
end;

procedure CopyRichEditSelection(Source,Dest: TRichEdit);
var
  aMemStream: TMemoryStream;
begin
  Dest.Clear;
  if (Source.SelLength > 0) then
  begin
    aMemStream := TMemoryStream.Create;
    try
      GetRTFSelection(Source, aMemStream);
      aMemStream.Position := 0;
      Dest.Lines.LoadFromStream(aMemStream);
    finally
      aMemStream.Free;
    end;
  end;
end;

如果您不想使用Windows剪贴板进行复制/粘贴操作，可以使用流：

{{1}}

如何将特定行从一个TRichEdit控件复制到另一个？

1 个答案: