请问如何提高Fastreport to excel的速度(100分)

我现在用fastreport产生一报表，但是用fastreport的导出功能导到excel文件好慢（报表产生速度很快），如何提高速度呢？

unit DBGridEhToExcel;
interface
uses
Windows, Messages, SysUtils, Variants, Classes, Graphics, Controls, Forms,
Dialogs, DB, ComCtrls, ExtCtrls, StdCtrls, Gauges, DBGridEh, ShellApi;
type
TTitleCell = array of array of String;
//分解DBGridEh的标题
TDBGridEhTitle = class
private
FDBGridEh: TDBGridEh;
//对应DBGridEh
FColumnCount: integer;
//DBGridEh列数(指visible为True的列数)
FRowCount: integer;
//DBGridEh多表头层数(没有多表头则层数为1)
procedure SetDBGridEh(const Value: TDBGridEh);
function GetTitleRow: integer;
//获取DBGridEh多表头层数
function GetTitleColumn: integer;
//获取DBGridEh列数
public
//分解DBGridEh标题，由TitleCell二维动态数组返回
procedure GetTitleData(var TitleCell: TTitleCell);
published
property DBGridEh: TDBGridEh read FDBGridEh write SetDBGridEh;
property ColumnCount: integer read FColumnCount;
property RowCount: integer read FRowCount;
end;

TDBGridEhToExcel = class(TComponent)
private
FCol: integer;
FRow: integer;
FProgressForm: TForm;
{进度窗体}
FGauge: TGauge;
{进度条}
Stream: TStream;
{输出文件流}
FBookMark: TBookmark;

FShowProgress: Boolean;
{是否显示进度窗体}
FDBGridEh: TDBGridEh;
Fbegin
Date: TCaption;
{开始日期}
FTitleName: TCaption;
{Excel文件标题}
FEndDate: TCaption;
{结束日期}
FUserName: TCaption;
{制表人}
FFileName: String;
{保存文件名}
procedure SetShowProgress(const Value: Boolean);
procedure SetDBGridEh(const Value: TDBGridEh);
procedure Setbegin
Date(const Value: TCaption);
procedure SetEndDate(const Value: TCaption);
procedure SetTitleName(const Value: TCaption);
procedure SetUserName(const Value: TCaption);
procedure SetFileName(const Value: String);

procedure IncColRow;
procedure WriteBlankCell;
{写空单元格}
{写数字单元格}
procedure WriteFloatCell(const AValue:do
uble;
const IncStatus: Boolean=True);
{写整型单元格}
procedure WriteIntegerCell(const AValue: Integer;
const IncStatus: Boolean=True);
{写字符单元格}
procedure WriteStringCell(const AValue: string;
const IncStatus: Boolean=True);
procedure WritePrefix;
procedure WriteSuffix;
procedure WriteHeader;
{输出Excel标题}
procedure WriteTitle;
{输出Excel列标题}
procedure WriteDataCell;
{输出数据集内容}
procedure WriteFooter;
{输出DBGridEh表脚}
procedure SaveStream(aStream: TStream);
procedure CreateProcessForm(AOwner: TComponent);
{生成进度窗体}
{根据表格修改数据集字段顺序及字段中文标题}
procedure SetDataSetCrossIndexDBGridEh;
public
constructor Create(AOwner: TComponent);
override;
destructor Destroy;
override;
procedure ExportToExcel;
{输出Excel文件}
published
property DBGridEh: TDBGridEh read FDBGridEh write SetDBGridEh;
property ShowProgress: Boolean read FShowProgress write SetShowProgress;
property TitleName: TCaption read FTitleName write SetTitleName;
property begin
Date: TCaption read Fbegin
Date write Setbegin
Date;
property EndDate: TCaption read FEndDate write SetEndDate;
property UserName: TCaption read FUserName write SetUserName;
property FileName: String read FFileName write SetFileName;
end;

var
CXlsBof: array[0..5] of Word = ($809, 8, 0, $10, 0, 0);
CXlsEof: array[0..1] of Word = ($0A, 00);
CXlsLabel: array[0..5] of Word = ($204, 0, 0, 0, 0, 0);
CXlsNumber: array[0..4] of Word = ($203, 14, 0, 0, 0);
CXlsRk: array[0..4] of Word = ($27E, 10, 0, 0, 0);
CXlsBlank: array[0..4] of Word = ($201, 6, 0, 0, $17);
implementation
{ TDBGridEhTitle }

function TDBGridEhTitle.GetTitleColumn: integer;
var
i, ColumnCount: integer;
begin
ColumnCount := 0;
for i := 0 to DBGridEh.Columns.Count - 1do
begin
if DBGridEh.Columns.Visible then
Inc(ColumnCount);
end;

Result := ColumnCount;
end;

procedure TDBGridEhTitle.GetTitleData(var TitleCell: TTitleCell);
var
i, Row, Col: integer;
Caption: String;
begin
FColumnCount := GetTitleColumn;
FRowCount := GetTitleRow;
SetLength(TitleCell,FColumnCount,FRowCount);
Row := 0;
for i := 0 to DBGridEh.Columns.Count - 1do
begin
if DBGridEh.Columns.Visible then
begin
Col := 0;
Caption := DBGridEh.Columns.Title.Caption;
while POS('|', Caption) > 0do
begin
TitleCell[Row,Col] := Copy(Caption, 1, Pos('|',Caption)-1);
Caption := Copy(Caption,Pos('|', Caption)+1, Length(Caption));
Inc(Col);
end;
TitleCell[Row, Col] := Caption;
Inc(Row);
end;
end;
end;

function TDBGridEhTitle.GetTitleRow: integer;
var
i, j: integer;
MaxRow, Row: integer;
begin
MaxRow := 1;
for i := 0 to DBGridEh.Columns.Count - 1do
begin
Row := 1;
for j := 0 to Length(DBGridEh.Columns.Title.Caption)do
begin
if DBGridEh.Columns.Title.Caption[j] = '|' then
Inc(Row);
end;

if MaxRow < Row then
MaxRow := Row;
end;

Result := MaxRow;
end;

procedure TDBGridEhTitle.SetDBGridEh(const Value: TDBGridEh);
begin
FDBGridEh := Value;
end;

{ TDBGridEhToExcel }
constructor TDBGridEhToExcel.Create(AOwner: TComponent);
begin
inherited Create(AOwner);
FShowProgress := True;
end;

procedure TDBGridEhToExcel.SetShowProgress(const Value: Boolean);
begin
FShowProgress := Value;
end;

procedure TDBGridEhToExcel.SetDBGridEh(const Value: TDBGridEh);
begin
FDBGridEh := Value;
end;

procedure TDBGridEhToExcel.Setbegin
Date(const Value: TCaption);
begin
Fbegin
Date := Value;
end;

procedure TDBGridEhToExcel.SetEndDate(const Value: TCaption);
begin
FEndDate := Value;
end;

procedure TDBGridEhToExcel.SetTitleName(const Value: TCaption);
begin
FTitleName := Value;
end;

procedure TDBGridEhToExcel.SetUserName(const Value: TCaption);
begin
FUserName := Value;
end;

procedure TDBGridEhToExcel.SetFileName(const Value: String);
begin
FFileName := Value;
end;

procedure TDBGridEhToExcel.IncColRow;
begin
if FCol = DBGridEh.DataSource.DataSet.FieldCount - 1 then
begin
Inc(FRow);
FCol := 0;
end
else
Inc(FCol);
end;

procedure TDBGridEhToExcel.WriteBlankCell;
begin
CXlsBlank[2] := FRow;
CXlsBlank[3] := FCol;
Stream.WriteBuffer(CXlsBlank, SizeOf(CXlsBlank));
IncColRow;
end;

procedure TDBGridEhToExcel.WriteFloatCell(const AValue:do
uble;
const IncStatus: Boolean=True);
begin
CXlsNumber[2] := FRow;
CXlsNumber[3] := FCol;
Stream.WriteBuffer(CXlsNumber, SizeOf(CXlsNumber));
Stream.WriteBuffer(AValue, 8);
if IncStatus then
IncColRow;
end;

procedure TDBGridEhToExcel.WriteIntegerCell(const AValue: Integer;
const IncStatus: Boolean=True);
var
V: Integer;
begin
CXlsRk[2] := FRow;
CXlsRk[3] := FCol;
Stream.WriteBuffer(CXlsRk, SizeOf(CXlsRk));
V := (AValue Shl 2) Or 2;
Stream.WriteBuffer(V, 4);
if IncStatus then
IncColRow;
end;

procedure TDBGridEhToExcel.WriteStringCell(const AValue: string;
const IncStatus: Boolean=True);
var
L: integer;
begin
L := Length(AValue);
CXlsLabel[1] := 8 + L;
CXlsLabel[2] := FRow;
CXlsLabel[3] := FCol;
CXlsLabel[5] := L;
Stream.WriteBuffer(CXlsLabel, SizeOf(CXlsLabel));
Stream.WriteBuffer(Pointer(AValue)^, L);
if IncStatus then
IncColRow;
end;

procedure TDBGridEhToExcel.WritePrefix;
begin
Stream.WriteBuffer(CXlsBof, SizeOf(CXlsBof));
end;

procedure TDBGridEhToExcel.WriteSuffix;
begin
Stream.WriteBuffer(CXlsEof, SizeOf(CXlsEof));
end;

procedure TDBGridEhToExcel.WriteHeader;
var
OpName, OpDate: String;
begin
//标题
FCol := 3;
WriteStringCell(TitleName,False);
FCol := 0;
Inc(FRow);
if Trim(begin
Date) <> '' then
begin
//开始日期
FCol := 0;
WriteStringCell(begin
Date,False);
FCol := 0
end;

if Trim(EndDate) <> '' then
begin
//结束日期
FCol := 5;
WriteStringCell(EndDate,False);
FCol := 0;
end;

if (Trim(begin
Date) <> '') or (Trim(EndDate) <> '') then
Inc(FRow);
//制表人
OpName := '制表人：' + UserName;
FCol := 0;
WriteStringCell(OpName,False);
FCol := 0;
//制表时间
OpDate := '制表时间：' + DateTimeToStr(Now);
FCol := 5;
WriteStringCell(OpDate,False);
FCol := 0;
Inc(FRow);

end;

procedure TDBGridEhToExcel.WriteTitle;
var
i, j: integer;
DBGridEhTitle: TDBGridEhTitle;
TitleCell: TTitleCell;
begin
DBGridEhTitle := TDBGridEhTitle.Create;
try
DBGridEhTitle.DBGridEh := FDBGridEh;
DBGridEhTitle.GetTitleData(TitleCell);
try
for i := 0 to DBGridEhTitle.RowCount - 1do
begin
for j := 0 to DBGridEhTitle.ColumnCount - 1do
begin
FCol := j;
WriteStringCell(TitleCell[j,i],False);
end;
Inc(FRow);
end;
FCol := 0;
except
end;
finally
DBGridEhTitle.Free;
end;
end;

procedure TDBGridEhToExcel.WriteDataCell;
var
i: integer;
begin
DBGridEh.DataSource.DataSet.DisableControls;
FBookMark := DBGridEh.DataSource.DataSet.GetBookmark;
try
DBGridEh.DataSource.DataSet.First;
while not DBGridEh.DataSource.DataSet.Eofdo
begin
for i := 0 to DBGridEh.DataSource.DataSet.FieldCount - 1do
begin
if DBGridEh.DataSource.DataSet.Fields.IsNull or (not
DBGridEh.DataSource.DataSet.Fields.Visible) then
WriteBlankCell
else
begin
case DBGridEh.DataSource.DataSet.Fields.DataType of
ftSmallint, ftInteger, ftWord, ftAutoInc, ftBytes:
WriteIntegerCell(DBGridEh.DataSource.DataSet.Fields.AsInteger);
ftFloat, ftCurrency, ftBCD:
WriteFloatCell(DBGridEh.DataSource.DataSet.Fields.AsFloat);
else
if DBGridEh.DataSource.DataSet.Fields Is TBlobfield then
//
此类型的字段(图像等)暂无法读取显示
WriteStringCell('')
else
WriteStringCell(DBGridEh.DataSource.DataSet.Fields.AsString);
end;
end;
end;

//显示进度条进度过程
if ShowProgress then
begin
FGauge.Progress := DBGridEh.DataSource.DataSet.RecNo;
FGauge.Refresh;
end;

DBGridEh.DataSource.DataSet.Next;
end;

finally
if DBGridEh.DataSource.DataSet.BookmarkValid(FBookMark) then
DBGridEh.DataSource.DataSet.GotoBookmark(FBookMark);
DBGridEh.DataSource.DataSet.EnableControls;
end;
end;

procedure TDBGridEhToExcel.WriteFooter;
var
i, j: integer;
begin
if DBGridEh.FooterRowCount = 0 then
exit;
FCol := 0;
if DBGridEh.FooterRowCount = 1 then
begin
for i := 0 to DBGridEh.Columns.Count - 1do
begin
if DBGridEh.Columns.Visible then
begin
WriteStringCell(DBGridEh.Columns.Footer.Value,False);
Inc(FCol);
end;
end;
end
else
if DBGridEh.FooterRowCount > 1 then
begin
for i := 0 to DBGridEh.Columns.Count - 1do
begin
if DBGridEh.Columns.Visible then
begin
for j := 0 to DBGridEh.Columns.Footers.Count - 1do
begin
WriteStringCell(DBGridEh.Columns.Footers[j].Value ,False);
Inc(FRow);
end;
Inc(FCol);
FRow := FRow - DBGridEh.Columns.Footers.Count;
end;
end;
end;
FCol := 0;
end;

procedure TDBGridEhToExcel.SaveStream(aStream: TStream);
begin
FCol := 0;
FRow := 0;
Stream := aStream;
//输出前缀
WritePrefix;
//输出表格标题
WriteHeader;
//输出列标题
WriteTitle;
//输出数据集内容
WriteDataCell;
//输出DBGridEh表脚
WriteFooter;
//输出后缀
WriteSuffix;
end;

procedure TDBGridEhToExcel.ExportToExcel;
var
FileStream: TFileStream;
Msg: String;
begin
//如果数据集为空或没有打开则退出
if (DBGridEh.DataSource.DataSet.IsEmpty) or (not DBGridEh.DataSource.DataSet.Active) then
exit;
//如果保存的文件名为空则退出
if Trim(FileName) = '' then
exit;

//根据表格修改数据集字段顺序及字段中文标题
SetDataSetCrossIndexDBGridEh;
Screen.Cursor := crHourGlass;
try
try
if FileExists(FileName) then
begin
Msg := '已存在文件（' + FileName + '），是否覆盖？';
if Application.MessageBox(PChar(Msg),'提示',MB_YESNO+MB_ICONQUESTION+MB_DEFBUTTON2) =
IDYES then
begin
//删除文件
DeleteFile(FileName)
end
else
exit;
end;

//显示进度窗体
if ShowProgress then
CreateProcessForm(nil);

FileStream := TFileStream.Create(FileName, fmCreate);
try
//输出文件
SaveStream(FileStream);
finally
FileStream.Free;
end;

//打开Excel文件
ShellExecute(0, 'Open', PChar(FileName), nil, nil, SW_SHOW);
except
end;
finally
if ShowProgress then
FreeAndNil(FProgressForm);
Screen.Cursor := crDefault;
end;
end;

destructor TDBGridEhToExcel.Destroy;
begin
inherited Destroy;
end;

procedure TDBGridEhToExcel.CreateProcessForm(AOwner: TComponent);
var
Panel: TPanel;
Prompt: TLabel;
{提示的标签}
begin
if Assigned(FProgressForm) then
exit;
FProgressForm := TForm.Create(AOwner);
with FProgressFormdo
begin
try
Font.Name := '宋体';
{设置字体}
Font.Size := 9;
BorderStyle := bsNone;
Width := 300;
Height := 100;
BorderWidth := 1;
Color := clBlack;
Position := poScreenCenter;
Panel := TPanel.Create(FProgressForm);
with Paneldo
begin
Parent := FProgressForm;
Align := alClient;
BevelInner := bvNone;
BevelOuter := bvRaised;
Caption := '';
end;

Prompt := TLabel.Create(Panel);
with Promptdo
begin
Parent := Panel;
AutoSize := True;
Left := 25;
Top := 25;
Caption := '正在导出数据，请稍候......';
Font.Style := [fsBold];
end;

FGauge := TGauge.Create(Panel);
with FGaugedo
begin
Parent := Panel;
ForeColor := clBlue;
Left := 20;
Top := 50;
Height := 13;
Width := 260;
MinValue := 0;
MaxValue := DBGridEh.DataSource.DataSet.RecordCount;
end;
except
end;
end;

FProgressForm.Show;
FProgressForm.Update;
end;

procedure TDBGridEhToExcel.SetDataSetCrossIndexDBGridEh;
var
i: integer;
begin
for i := 0 to DBGridEh.Columns.Count - 1do
begin
DBGridEh.DataSource.DataSet.FieldByName(DBGridEh.Columns.Items.FieldName).Index := i;
DBGridEh.DataSource.DataSet.FieldByName(DBGridEh.Columns.Items.FieldName).DisplayLabel
:= DBGridEh.Columns.Items.Title.Caption;
DBGridEh.DataSource.DataSet.FieldByName(DBGridEh.Columns.Items.FieldName).Visible :=
DBGridEh.Columns.Items.Visible;
end;

for i := 0 to DBGridEh.DataSource.DataSet.FieldCount - 1do
begin
if POS('*****',DBGridEh.DataSource.DataSet.Fields.DisplayLabel) > 0 then
DBGridEh.DataSource.DataSet.Fields.Visible := False;
end;

end;

end.

/*****************************************************************/
调用的例子
var
DBGridEhToExcel: TDBGridEhToExcel;
begin
DBGridEhToExcel := TDBGridEhToExcel.Create(nil);
try
DBGridEhToExcel.TitleName := '测试测试测试测试测试测试测试';
DBGridEhToExcel.begin
Date := '开始日期：2005-07-01';
DBGridEhToExcel.EndDate := '结束日期：2005-07-18';
DBGridEhToExcel.UserName := '系统管理员';
DBGridEhToExcel.DBGridEh := DBGridEh1;
DBGridEhToExcel.ShowProgress := True;
DBGridEhToExcel.FileName := 'c:/123.xls';
DBGridEhToExcel.ExportToExcel;
finally
DBGridEhToExcel.Free;
end;

要自己写代码啊

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接受答案了.