Копировать и вставлять ячейки TStringGrid в буфер обмена

Вариант 1:

Source: https://www.swissdelphicenter.ch

uses
  Clipbrd;

//Copy 
procedure TForm1.Button1Click(Sender: TObject);
var
  S: string;
  GRect: TGridRect;
  C, R: Integer;
begin
  GRect := StringGrid1.Selection;
  S  := '';
  for R := GRect.Top to GRect.Bottom do
  begin
    for C := GRect.Left to GRect.Right do
    begin
      if C = GRect.Right then  S := S + (StringGrid1.Cells[C, R])
      else
        S := S + StringGrid1.Cells[C, R] + #9;
    end;
    S := S + #13#10;
end;
  ClipBoard.AsText := S;
end;

// Paste 
procedure TForm1.Button2Click(Sender: TObject);
var
  Grect: TGridRect;
  S, CS, F: string;
  L, R, C: Byte;
begin
  GRect := StringGrid1.Selection;
  L := GRect.Left;
  R := GRect.Top;
  S := ClipBoard.AsText;
  R := R - 1;
  while Pos(#13, S) > 0 do
  begin
    R  := R + 1;
    C  := L - 1;
    CS := Copy(S, 1,Pos(#13, S));
    while Pos(#9, CS) > 0 do
    begin
      C := C + 1;
      if (C <= StringGrid1.ColCount - 1) and (R <= StringGrid1.RowCount - 1) then
        StringGrid1.Cells[C, R] := Copy(CS, 1,Pos(#9, CS) - 1);
      F := Copy(CS, 1,Pos(#9, CS) - 1);
      Delete(CS, 1,Pos(#9, CS));
    end;
    if (C <= StringGrid1.ColCount - 1) and (R <= StringGrid1.RowCount - 1) then
      StringGrid1.Cells[C + 1,R] := Copy(CS, 1,Pos(#13, CS) - 1);
    Delete(S, 1,Pos(#13, S));
    if Copy(S, 1,1) = #10 then
      Delete(S, 1,1);
  end;
end;

Вариант 2:

Author: Тенцер А.Л.

Source: DelphiWorld 6.0 https://delphiworld.narod.ru/

Как скопировать выбранные в DBGrid записи в клипборд

const
 FIELD_DELIMITER = #9;
 RECORD_DELIMITER = #10;


procedure CopyDBGridToClipboard( Grid : TDBGrid );
var
 BM : String;
 S : String;
 S1: String;
 I : Integer;
begin
 with Grid  do begin
  if Assigned( DataSource ) and
     Assigned( DataSource.DataSet ) and
     DataSource.DataSet.Active then
  with DataSource.DataSet do begin
   S := '';
   DisableControls;
   BM := BookMark;
   for I := 0 to Pred( Columns.Count ) do begin
    if Assigned(Columns.Items[I].Field) then
      S := S + Columns.Items[I].Title.Caption + FIELD_DELIMITER;
   end;
   S[ Length( S ) ] := RECORD_DELIMITER;
   First;
   while not Eof do begin
    S1 := '';
    for I := 0 to Pred( Columns.Count ) do begin
      if Assigned(Columns.Items[I].Field) then
        S1 := S1 + FieldByName( Columns[I].FieldName ).AsString +
              FIELD_DELIMITER;
    end;
    S1[ Length( S1 ) ] := RECORD_DELIMITER;
    S := S + S1;
    Next;
   end;
   BookMark := BM;
   EnableControls;
//   Clipboard.SetTextBuf( PChar( S ) );
   SendToClipboard( S );
  end;
 end;
end;