http://dev.csdn.net/article/53/53442.shtm
如何將幾個DBGRID里的內容導入同一個Excel表中？
在軟件實際制作中，為節省開發成本和開發周期，一些軟件人員通常會吧DBGrid中的數據直接導出到Excel表中，而先前能看到的函數僅僅只能在WorkBook的一個Sheet中導入數據，不支持多Sheet！。

~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

單元應用：
Windows, Messages, SysUtils, Variants, Classes, Graphics, Controls, Forms,
Dialogs, StdCtrls, DB, DBTables, Grids, DBGrids, ActiveX, ComObj,
Excel2000, OleServer;

PRocedure CopyDbDataToExcel(Args: array of const);
var
  iCount, jCount: Integer;
  XLApp: Variant;
  Sheet: Variant;
  I: Integer;
begin
  Screen.Cursor := crHourGlass;
  if not VarIsEmpty(XLApp) then
  begin
    XLApp.DisplayAlerts := False;
    XLApp.Quit;
    VarClear(XLApp);
  end;

  try
    XLApp := CreateOleObject(‘Excel.application‘);
  except
    Screen.Cursor := crDefault;
  Exit;
  end;

  XLApp.WorkBooks.Add;//  (1)
  XLApp.SheetsInNewWorkbook := High(Args) + 1;//  (2)
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
  XLApp.SheetsInNewWorkbook := High(Args) + 1;
  XLApp.WorkBooks.Add; 
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
  for I := Low(Args) to High(Args) do
  begin
    XLApp.WorkBooks[1].WorkSheets[I+1].Name := TDBGrid(Args[I].VObject).Name;
    Sheet := XLApp.Workbooks[1].WorkSheets[TDBGrid(Args[I].VObject).Name];

    if not TDBGrid(Args[I].VObject).DataSource.DataSet.Active then
    begin
      Screen.Cursor := crDefault;
      Exit;
    end;

    TDBGrid(Args[I].VObject).DataSource.DataSet.first;
    for iCount := 0 to TDBGrid(Args[I].VObject).Columns.Count - 1 do
      Sheet.Cells[1, iCount + 1] := TDBGrid(Args[I].VObject).Columns.Items[iCount].Title.Caption;

    jCount := 1;
    while not TDBGrid(Args[I].VObject).DataSource.DataSet.Eof do
    begin
      for iCount := 0 to TDBGrid(Args[I].VObject).Columns.Count - 1 do
        Sheet.Cells[jCount + 1, iCount + 1] := TDBGrid(Args[I].VObject).Columns.Items[iCount].Field.AsString;

      Inc(jCount);
      TDBGrid(Args[I].VObject).DataSource.DataSet.Next;
    end;
  end;

  XlApp.Visible := True;
  Screen.Cursor := crDefault;
end;
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
經過測試，上面這段代碼確實有問題：（有興趣的朋友可以自己測試一下）

比如：
先form1.CopyDbDataToExcel([dbgrid1,dbgrid2,dbgrid3]);//OK
再form1.CopyDbDataToExcel([dbgrid1,dbgrid2,dbgrid,dbgrid4]);//這樣就出錯，提示：無效索引

如果這樣：
先form1.CopyDbDataToExcel([dbgrid1,dbgrid2,dbgrid3,dbgrid4]);//OK
再form1.CopyDbDataToExcel([dbgrid1,dbgrid2]);//OK

~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
總之：先少后多，就出錯...
原因就出在上面代碼（1），（2）兩段上，經過測試,正確的應該將（1），（2）代碼對調，才能保證不出錯....