怎么样将数据集中的数据保存成为Excel文件？

/*******************************************************************************
* 函数名: ExportDataToExcel
* 输入参数: ado //pointer of TADOQuery
* dia //pointer of TSaveDialog
* grid //pointer of TDBGrid
* k //y coordiate of cells
* Str //title of Excel table
* 输出参数: None
* 返回值: void
* 描述:
*******************************************************************************/
void ExportDataToExcel(TADOQuery *ado, TSaveDialog *dia, TDBGrid *grid, int k, char* Str)
{
Variant ex, newxls, cellms;
AnsiString sFileName;
int row, i, j = 1;

if (dia->Execute())
{
try
{
ex = CreateOleObject("Excel.Application");//启动Excel
ex.OlePropertySet("Visible", (Variant)false);//使Excel不可见
newxls = (ex.OlePropertyGet("Workbooks")).OleFunction("Add");//添加一个工作薄
cellms = newxls.OlePropertyGet("ActiveSheet"); //创建工作区
}

catch (...)
{
ShowMessage("无法启动Excel");
return;
}

ado->Active = true;
ado->First();

row = 1;//在第一行显示标题
//ex.OlePropertyGet("Cells", 1, 6).OlePropertySet("Value", );
ex.OlePropertyGet("Cells", 1, k).OlePropertySet("Value", Str);
cellms = ex.Exec(PropertyGet("Range") << ("A" + IntToStr(row) + ":A" + IntToStr(row)));

for (i = 0; i < ado->FieldCount; i++)
{
//将字段名写到工作薄的第二行
cellms.OlePropertyGet("Cells", 2, i + 1).OlePropertySet("Value", (WideString)grid->Columns->Items[i]->Title->Caption.c_str());
//cellms.OlePropertyGet("Cells", 2, i + 1).OlePropertySet("Value", (WideString)ado->Fields->Fields[i]->FieldName);
}

while (!ado->Eof)//将数据库中的记录依次写到Excel中
{
j = j + 1;

for (i = 0; i < ado->FieldCount; i++)
{
cellms.OlePropertyGet("Cells", j + 1, i + 1).OlePropertySet("Value",(WideString)ado->Fields->Fields[i]->AsString);
}
ado->Next();
}

sFileName = dia->FileName;
newxls.OleProcedure("SaveAs", sFileName.c_str()); //保存Excel文件

ex.OleFunction("Quit");//退出Excel
ex = Unassigned;
newxls = Unassigned;
cellms = Unassigned;
}
}

//****得到要保存的 EXCEL 文件名******//
function GetSavedFileName : string;
var
SD1:TSaveDialog;
begin
SD1 := TSaveDialog.Create(nil);
SD1.Filter := '*.csv|*.csv';
SD1.DefaultExt := '*.csv';
Result := '';
if SD1.Execute then
begin
if FileExists(SD1.FileName) then
begin
if (MessageDlg('文件'+SD1.FileName+'已存在,要覆盖吗?',mtConfirmation, [mbYes, mbNo], 0) = mrYes) then
DeleteFile(SD1.FileName)
else
Exit;
end;
Result := SD1.FileName;
end;
end;

// **** DBGrid 的数据输出到 EXCEL 文件中 ******** //
procedure DBGridToExcel(DBGrid: TDBGrid; FileName: string);
var
CSV, DBRow: TStringList;
I, J: Integer;
DS: TDataSet;
FieldName: string;
begin
if FileName = '' then exit;
CSV := TStringList.Create;
try
DBRow := TStringList.Create;
try
{ 添加标题 }
for I := 0 to DBGrid.Columns.Count-1 do
begin
DBRow.Add(DBGrid.Columns[I].Title.Caption);
end;
CSV.Add(DBRow.CommaText);
{ 添加内容 }
DS := DBGrid.DataSource.DataSet;
if DS.Active then
begin
DS.DisableControls;
try
J := DS.RecNo;
DS.First;
while not DS.Eof do
begin
DBRow.Clear;
for I := 0 to DBGrid.Columns.Count-1 do
begin
FieldName := DBGrid.Columns[I].FieldName;
with DS.FieldByName(FieldName) do
begin
case DataType of
ftString: DBRow.Add(AsString);
ftDateTime: DBRow.Add(FormatDateTime(DATETIME, AsDateTime));
ftCurrency, ftBCD: DBRow.Add(CurrToStr(AsCurrency));
ftFloat: DBRow.Add(FloatToStr(AsFloat));
ftInteger: DBRow.Add(IntToStr(AsInteger));
end;
end;
end;
CSV.Add(DBRow.CommaText);
DS.Next;
end;

DS.RecNo := J;
finally
DS.EnableControls;
end;
end;

CSV.SaveToFile(FileName);
finally
DBRow.Free;
end;
finally
CSV.Free;
end;
end;