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function ExportToExcel(dbgrid:tdbgrid):boolean;
const
xlNormal=-4143;
var
i,j,k:integer;
str,filename:string;
excel:OleVariant;
SavePlace: TBookmark;
savedialog:tsavedialog;
ProgressBar1:TProgressBar;
begin
result:=false;
filename:=‘‘;
if dbgrid.DataSource.DataSet.RecordCount>65536 then
begin
if application.messagebox(‘需要导出的数据过大，Excel最大只能容纳65536行,是否还要继续？‘,‘询问‘,mb_yesno+mb_iconquestion)=idno then
exit;
end;
screen.Cursor:=crHourGlass;
try
excel:=CreateOleObject(‘Excel.Application‘);
excel.workbooks.add;
except
screen.cursor:=crDefault;
showmessage(‘无法调用Excel！‘);
exit;
end;
savedialog:=tsavedialog.Create(nil);
savedialog.Filter:=‘Excel文件(*.xls)|*.xls‘;
if savedialog.Execute then
begin
if FileExists(savedialog.FileName) then
try
if application.messagebox(‘该文件已经存在，要覆盖吗？‘,‘询问‘,mb_yesno+mb_iconquestion)=idyes then
DeleteFile(PChar(savedialog.FileName))
else
begin
Excel.Quit;
savedialog.free;
screen.cursor:=crDefault;
Exit;
end;
except
Excel.Quit;
savedialog.free;
screen.cursor:=crDefault;
Exit;
end;
filename:=savedialog.FileName;
end;
savedialog.free;
application.ProcessMessages;
if filename=‘‘ then
begin
result:=false;
Excel.Quit;
screen.cursor:=crDefault;
exit;
end;
k:=0;
for i:=0 to dbgrid.Columns.count-1 do
begin
if dbgrid.Columns.Items[i].Visible then
begin
//Excel.Columns[k+1].ColumnWidth:=dbgrid.Columns.Items[i].Title.Column.Width;
excel.cells[1,k+1]:=dbgrid.Columns.Items[i].Title.Caption;
inc(k);
end;
end;
dbgrid.DataSource.DataSet.DisableControls;
saveplace:=dbgrid.DataSource.DataSet.GetBookmark;
dbgrid.DataSource.dataset.First;
i:=2;
if dbgrid.DataSource.DataSet.recordcount>65536 then
ProgressBar1:=ProgressBarform(65536)
else
ProgressBar1:=ProgressBarform(dbgrid.DataSource.DataSet.recordcount);
while not dbgrid.DataSource.dataset.Eof do
begin
k:=0;
for j:=0 to dbgrid.Columns.count-1 do
begin
if dbgrid.Columns.Items[j].Visible then
begin
excel.cells[i,k+1].NumberFormat:=‘@‘;
if not dbgrid.DataSource.dataset.fieldbyname(dbgrid.Columns.Items[j].FieldName).isnull then
begin
str := dbgrid.DataSource.dataset.fieldbyname(dbgrid.Columns.Items[j].FieldName).value;
Excel.Cells[i, k + 1] := Str;
end;
inc(k);
end
else
continue;
end;
if i=65536 then
break;
inc(i);
ProgressBar1.StepBy(1);
dbgrid.DataSource.dataset.next;
end;
progressbar1.Owner.Free;
application.ProcessMessages;
dbgrid.DataSource.dataset.GotoBookmark(SavePlace);
dbgrid.DataSource.dataset.EnableControls;
try
if copy(FileName,length(FileName)-3,4)<>‘.xls‘ then
FileName:=FileName+‘.xls‘;
Excel.ActiveWorkbook.SaveAs(FileName,xlNormal,‘‘, ‘‘,False,False);
except
Excel.Quit;
screen.cursor:=crDefault;
exit;
end;
//Excel.Visible := true;
Excel.Quit;
screen.cursor:=crDefault;
Result:= true;
end;
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