DBGridEh导出EXCEL-2

procedure TFrmdbGridEh.ToolButton2Click(Sender: TObject);

var
  ExpClass:TDBGridEhExportClass;
  Ext:String;
  lssavedialog: tsavedialog;

begin

try
     lssavedialog := tsavedialog.Create(nil);
     lssavedialog.Filter := '*.xls|*.xls|*.csv|*.csv|*.htm|*.htm|*.rtf|*.rtf|*.txt|*.txt';
     lssavedialog.FileName := 'file1';
     if lssavedialog.Execute then
     begin
       case lssavedialog.FilterIndex of
         1: begin ExpClass := TDBGridEhExportAsText; Ext := 'xls'; end;
         2: begin ExpClass := TDBGridEhExportAsCSV; Ext := 'csv'; end;
         3: begin ExpClass := TDBGridEhExportAsHTML; Ext := 'htm'; end;
         4: begin ExpClass := TDBGridEhExportAsRTF; Ext := 'rtf'; end;
         5: begin ExpClass := TDBGridEhExportAsXLS; Ext := 'txt'; end;
       else
         ExpClass := nil; Ext := '';
       end;
       if ExpClass <> nil then
       begin
         if UpperCase(Copy(lssavedialog.FileName, Length(lssavedialog.FileName) - 2, 3)) <> UpperCase(Ext) then
           lssavedialog.FileName := lssavedialog.FileName + '.' + Ext;
         if FileExists(lssavedialog.FileName) then
         begin
           if application.MessageBox('文件名已存在，是否覆盖', '提示', MB_ICONASTERISK or MB_OKCANCEL) <> idok then
           begin
             exit;
           end;
         end;
         Screen.Cursor := crHourGlass;
         try
         SaveDBGridEhToExportFile(ExpClass, DBGridEh1, lssavedialog.FileName, true);
         except
           ShowMessage('NO');
         end;
         Screen.Cursor := crDefault;
       end;
     end;
   finally
     lssavedialog.Free;
   end;

end;