dbGridEh导出EXCEL时生成真正多表头 - 开博科技|手机开单|手机商店|送货单打印软件|销售管理系统|进销存|ERP供应链管理系统

unit Unit_DBGridEhToExcel;
//感谢原作者：蔡炆炆 2006年12月26日
//eW0ng(QQ:508882988)于2017年4月23日修正，能顺利运行在XE10.2 OFFICE2007成功导出多表头
interface
uses
SysUtils, Variants, Classes, Graphics, Controls, Forms, Excel2000, ComObj,
Dialogs, DB, DBGridEh, windows,ComCtrls,ExtCtrls;
type
TDBGridEhToExcel = class(TComponent)
private
FProgressForm: TForm;                               {进度窗体}
FtempGauge: TProgressBar;                         {进度条}
FShowProgress: Boolean;                               {是否显示进度窗体}
FShowOpenExcel:Boolean;                               {是否导出后打开Excel文件}
FDBGridEh: TDBGridEh;
FTitleName: TCaption;                               {Excel文件标题}
FUserName: TCaption;                                  {制表人}
procedure SetShowProgress(const Value: Boolean);    {是否显示进度条}
procedure SetShowOpenExcel(const Value: Boolean);    {是否打开生成的Excel文件}
procedure SetDBGridEh(const Value: TDBGridEh);
procedure SetTitleName(const Value: TCaption);       {标题名称}
procedure SetUserName(const Value: TCaption);       {使用人名称}
procedure CreateProcessForm(AOwner: TComponent);    {生成进度窗体}
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; //是否显示进度条
property ShowOpenExcel: Boolean read FShowOpenExcel write SetShowOpenExcel; //是否打开Excel
property TitleName: TCaption read FTitleName write SetTitleName;
property UserName: TCaption read FUserName write SetUserName;
end;
implementation
constructor TDBGridEhToExcel.Create(AOwner: TComponent);
begin
inherited Create(AOwner);
FShowProgress := True;
FShowOpenExcel:= True;
end;
procedure TDBGridEhToExcel.SetShowProgress(const Value: Boolean);
begin
FShowProgress := Value;
end;
procedure TDBGridEhToExcel.SetDBGridEh(const Value: TDBGridEh);
begin
FDBGridEh := Value;
end;
procedure TDBGridEhToExcel.SetTitleName(const Value: TCaption);
begin
FTitleName := Value;
end;
procedure TDBGridEhToExcel.SetUserName(const Value: TCaption);
begin
FUserName := Value;
end;
function IsFileInUse(fName: string ): boolean;
var
HFileRes: HFILE;
begin
Result :=false;
if not FileExists(fName) then exit;
HFileRes :=CreateFile(pchar(fName), GENERIC_READ
         or GENERIC_WRITE,0, nil,OPEN_EXISTING,FILE_ATTRIBUTE_NORMAL, 0);
Result :=(HFileRes=INVALID_HANDLE_VALUE);
if not Result then
CloseHandle(HFileRes);
end;
procedure TDBGridEhToExcel.ExportToExcel;
var
XLApp: Variant;
MyWorkBook: Variant;
Sheet: Variant;
s1, s2: string;
Caption,Msg: String;
Row, Col: integer;
iCount, jCount: Integer;
FBookMark: TBookmark;
FileName: String;
SaveDialog1: TSaveDialog;
begin
//如果数据集为空或没有打开则退出
if not DBGridEh.DataSource.DataSet.Active then Exit;
SaveDialog1 := TSaveDialog.Create(Nil);
SaveDialog1.FileName := TitleName + '_' + FormatDateTime('YYMMDDHHmmSS', now);
SaveDialog1.Filter := 'Excel文件|*.xls';
if SaveDialog1.Execute then
      FileName := SaveDialog1.FileName;
SaveDialog1.Free;
if FileName = '' then Exit;
while IsFileInUse(FileName) do
begin
   if Application.MessageBox('目标文件使用中，请退出目标文件后点击确定继续！',
      '注意', MB_OKCANCEL + MB_ICONWARNING) = IDOK then
   begin
   end
   else
   begin
      Exit;
   end;
end;
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(PChar(FileName))
   end
   else
      exit;
end;
Application.ProcessMessages;
Screen.Cursor := crHourGlass;
//显示进度窗体
if ShowProgress then
      CreateProcessForm(nil);
if not VarIsEmpty(XLApp) then
begin
      XLApp.DisplayAlerts := False;
      XLApp.Quit;
      VarClear(XLApp);
end;
//通过ole创建Excel对象
try
      XLApp := CreateOleObject('Excel.Application');
except
      MessageDlg('创建Excel对象失败，请检查你的系统是否正确安装了Excel软件！', mtError, [mbOk], 0);
      Screen.Cursor := crDefault;
      Exit;
end;
//生成工作页
//XLApp.WorkBooks.Add[XLWBatWorksheet];
MyWorkBook := CreateOleObject('Excel.Sheet');
MyWorkBook.WorkSheets[1].Name := TitleName;
Sheet := MyWorkBook.WorkSheets[1];
//写标题
sheet.cells[1, 1] := TitleName;
sheet.cells[1, 1].HorizontalAlignment:=3;//单元格居中
sheet.range[sheet.cells[1, 1], sheet.cells[1, DBGridEh.Columns.Count]].Select; //选择该列
//XLApp.selection.HorizontalAlignment := $FFFFEFF4;                            //居中
XLApp.selection.MergeCells := True;                                           //合并
//写表头
Row := 1;
jCount := 3;
for iCount := 0 to DBGridEh.Columns.Count - 1 do
begin
      Col := 2;
      Row := iCount+1;
      Caption := DBGridEh.Columns[iCount].Title.Caption;
      while POS('|', Caption) > 0 do
      begin
         jCount := 4;
         s1 := Copy(Caption, 1, Pos('|',Caption)-1);
         if s2 = s1 then
         begin
            sheet.range[sheet.cells[Col, Row-1],sheet.cells[Col, Row]].Select;
            //XLApp.selection.HorizontalAlignment := $FFFFEFF4;
            XLApp.selection.MergeCells := True;
            sheet.cells[Col, Row-1].HorizontalAlignment:=3;//单元格居中
         end
         else
            Sheet.cells[Col,Row] := Copy(Caption, 1, Pos('|',Caption)-1);
         Caption := Copy(Caption,Pos('|', Caption)+1, Length(Caption));
         Inc(Col);
         s2 := s1;
      end;
      Sheet.cells[Col, Row] := Caption;
      Inc(Row);
end;
//合并表头并居中
if jCount = 4 then
      for iCount := 1 to DBGridEh.Columns.Count do
         if Sheet.cells[3, iCount].Value = '' then
         begin
            sheet.range[sheet.cells[2, iCount],sheet.cells[3, iCount]].Select;
            //XLApp.selection.HorizontalAlignment := $FFFFEFF4;
            XLApp.selection.MergeCells := True;
            sheet.cells[2, iCount].HorizontalAlignment:=3;//单元格居中
         end
         else begin
            sheet.cells[3, iCount].Select;
            sheet.cells[3, iCount].HorizontalAlignment:=3;//单元格居中
            //XLApp.selection.HorizontalAlignment := $FFFFEFF4;
         end;
//读取数据
DBGridEh.DataSource.DataSet.DisableControls;
FBookMark := DBGridEh.DataSource.DataSet.GetBookmark;
DBGridEh.DataSource.DataSet.First;
while not DBGridEh.DataSource.DataSet.Eof do
begin
      for iCount := 1 to DBGridEh.Columns.Count do
      begin
         //Sheet.cells[jCount, iCount] :=DBGridEh.Columns.Items[iCount-1].Field.AsString;
      case DBGridEh.DataSource.DataSet.FieldByName(DBGridEh.Columns.Items[iCount-1].FieldName).DataType of
         ftSmallint, ftInteger, ftWord, ftAutoInc, ftBytes:
            Sheet.cells[jCount, iCount] :=DBGridEh.Columns.Items[iCount-1].Field.asinteger;
         ftFloat, ftCurrency, ftBCD:
            Sheet.cells[jCount, iCount] :=DBGridEh.Columns.Items[iCount-1].Field.AsFloat;
      else
         if DBGridEh.DataSource.DataSet.FieldByName(DBGridEh.Columns.Items[iCount-1].FieldName) is TBlobfield then // 此类型的字段(图像等)暂无法读取显示
            Sheet.cells[jCount, iCount] :=DBGridEh.Columns.Items[iCount-1].Field.AsString
         else
            Sheet.cells[jCount, iCount] :=''''+DBGridEh.Columns.Items[iCount-1].Field.AsString;
      end;
      end;
      Inc(jCount);
      //显示进度条进度过程
      if ShowProgress then
      begin
         FtempGauge.Position := DBGridEh.DataSource.DataSet.RecNo;
         FtempGauge.Refresh;
      end;
      DBGridEh.DataSource.DataSet.Next;
end;
if DBGridEh.DataSource.DataSet.BookmarkValid(FBookMark) then
      DBGridEh.DataSource.DataSet.GotoBookmark(FBookMark);
DBGridEh.DataSource.DataSet.EnableControls;
//读取表脚
if DBGridEh.FooterRowCount > 0 then
begin
      for Row := 0 to DBGridEh.FooterRowCount-1 do
      begin
         for Col := 0 to DBGridEh.Columns.Count-1 do
            Sheet.cells[jCount, Col+1] := DBGridEh.GetFooterValue(Row,DBGridEh.Columns[Col]);
         Inc(jCount);
      end;
end;
//调整列宽
// for iCount := 1 to DBGridEh.Columns.Count do
//       Sheet.Columns[iCount].EntireColumn.AutoFit;
sheet.cells[1, 1].Select;
XlApp.Workbooks[1].SaveAs(FileName);
XlApp.Visible := True;
XlApp := Unassigned;
if ShowProgress then
      FreeAndNil(FProgressForm);
Screen.Cursor := crDefault;
end;
destructor TDBGridEhToExcel.Destroy;
begin
inherited Destroy;
end;
procedure TDBGridEhToExcel.CreateProcessForm(AOwner: TComponent);
var
Panel: TPanel;
begin
if Assigned(FProgressForm) then
   exit;
FProgressForm := TForm.Create(AOwner);
with FProgressForm do
begin
try
   Font.Name := '宋体';                               {设置字体}
   Font.Size := 10;
   BorderStyle := bsNone;
   Width := 300;
   Height := 30;
   BorderWidth := 1;
   Color := clBlack;
   Position := poScreenCenter;
   Panel := TPanel.Create(FProgressForm);
   with Panel do
   begin
      Parent := FProgressForm;
      Align := alClient;
      Caption := '正在导出Excel，请稍候......';
      Color:=$00E9E5E0;
   end;
   FtempGauge:=TProgressBar.Create(Panel);
   with FtempGauge do
   begin
      Parent := Panel;
      Align:=alClient;
      Min := 0;
      Max:= DBGridEh.DataSource.DataSet.RecordCount;
      Position := 0;
   end;
except
end;
end;
FProgressForm.Show;
FProgressForm.Update;
end;
procedure TDBGridEhToExcel.SetShowOpenExcel(const Value: Boolean);
begin
FShowOpenExcel:=Value;
end;
end.