ado的奇怪问题，多步操作产生错误，请检查每一步状态值

[yubing8]

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procedure ote_work.Execute;
var
ExcelApp: Variant;
filename,oracle_user,oracle_password,temp_path:String;
i,j,k:integer;
Int_datebase:Array[0..7] of String;
begin
with Form1 do
begin
filename:=ExtractFilePath(paramstr(0))+'myini.ini';
myinifile:=TInifile.Create(filename);
Int_datebase[0]:=myinifile.readstring('oracle','oracle_sj','无');
Int_datebase[1]:=myinifile.readstring('oracle','oracle_wj','无');
Int_datebase[2]:=myinifile.readstring('oracle','oracle_tl','无');
Int_datebase[3]:=myinifile.readstring('oracle','oracle_ly','无');
Int_datebase[4]:=myinifile.readstring('oracle','oracle_zl','无');
Int_datebase[5]:=myinifile.readstring('oracle','oracle_jt','无');
Int_datebase[6]:=myinifile.readstring('oracle','oracle_xq','无');
Int_datebase[7]:=myinifile.readstring('oracle','oracle_qsy','无');
oracle_user:=myinifile.readstring('oracle','oracle_user','无');
oracle_password:=myinifile.readstring('oracle','oracle_password','无');
myinifile.Destroy;

Application.Initialize;
//CoInitialize(nil);
//Provider=OraOLEDB.Oracle.1;Password=test;Persist Security Info=True;User ID=test;Data Source=yb;Extended Properties=""
for k:=1 to 1 do
begin
case k of
0:temp_path:=path+'sj\';
1:temp_path:=path+'wj\';
2:temp_path:=path+'tl\';
3:temp_path:=path+'ly\';
4:temp_path:=path+'zl\';
5:temp_path:=path+'jt\';
6:temp_path:=path+'xq\';
7:temp_path:=path+'qsy\';
end;

g_fun_CreateTempDirectory(temp_path);

ADOQuery1.Active:=false;
ADOQuery1.Close;
ADOConnection1.Close;
ADOConnection1.Connected:=false;
//ADOConnection1.ConnectionString:='Provider=OraOLEDB.Oracle.1;Password='''+oracle_password+''';Persist Security Info=True;User ID='''+oracle_user+''';Data Source='''+Int_datebase[k]+''';Extended Properties=""';
ADOConnection1.ConnectionString:='Provider=MSDAORA.1;Password=pender412;User ID=baisadmin;Data Source=wjbais;Persist Security Info=True';
ADOQuery1.SQL.Text:='select a.reg_no reg_no,a.corp_china_name corp_china_name,d.chin_name oper_man,a.writeoff_date writeoff_date, ';
ADOQuery1.SQL.Text:=ADOQuery1.SQL.Text+' c.value writeoff_reason,e.name offer_unit,sysdate offer_date ';
ADOQuery1.SQL.Text:=ADOQuery1.SQL.Text+' from t_corp_hist a,t_main_writeoff b,';
ADOQuery1.SQL.Text:=ADOQuery1.SQL.Text+' (select code,value from t_dictionary where code_name like ''注销原因'') c,t_person d,';
ADOQuery1.SQL.Text:=ADOQuery1.SQL.Text+' t_unit e ';
ADOQuery1.SQL.Text:=ADOQuery1.SQL.Text+' where a.admit_no=b.admit_no and a.corp_status =''03'' and b.main_reason=c.code and a.oper_main_no=d.main_no';
ADOQuery1.SQL.Text:=ADOQuery1.SQL.Text+' and a.belong_unit=e.unit_no and trim(a.reg_no) is not null ';
ADOQuery1.Open;
ADOQuery1.Active:=true;
ExcelApp := CreateOleObject('Excel.Application');
ExcelApp.workbooks.add; //添加工作表
i:=2;
ExcelApp.Cells[1,1].Value:='REG_NO';
ExcelApp.Cells[1,2].Value:='CORP_CHINA_NAME';
ExcelApp.Cells[1,3].Value:='OPER_MAN';
ExcelApp.Cells[1,4].Value:='WRITEOFF_DATE';
ExcelApp.Cells[1,5].Value:='WRITEOFF_REASON';
ExcelApp.Cells[1,6].Value:='OFFER_UNIT';
ExcelApp.Cells[1,7].Value:='OFFER_DATE';
j:=ADOQuery1.RecordCount;
while ADOQuery1.Eof=false do
begin
ExcelApp.Cells[i,1].Value:=ADOQuery1.Fields[0].Value;
ExcelApp.Cells[i,2].Value:=ADOQuery1.Fields[1].Value;
ExcelApp.Cells[i,3].Value:=ADOQuery1.Fields[2].Value;
ExcelApp.Cells[i,4].Value:=ADOQuery1.Fields[3].Value;
ExcelApp.Cells[i,5].Value:=ADOQuery1.Fields[4].Value;
ExcelApp.Cells[i,6].Value:=ADOQuery1.Fields[5].Value;
ExcelApp.Cells[i,7].Value:=ADOQuery1.Fields[6].Value;

StatusBar1.Panels.Items[0].Text:=IntToStr(i);
StatusBar1.Panels.Items[1].Text:=IntToStr(j);
ProgressBar1.Position:=Round(100*(i/j));;
i:=i+1;
ADOQuery1.Next
end;
ADOQuery1.Active:=false;
ADOQuery1.Close;
ADOConnection1.Close;
filename:=temp_path+'t_corp_writeoff.xls';
ExcelApp.workbooks[1].saveas(filename);
//ExcelApp.close;
ExcelApp.Quit;
//CoUnInitialize;
//showmessage(Path);
end;
end;
//showmessage('导库成功');
end;

很奇怪的问题，请大家看看，我百思不得其解，我用了多线程

ExcelApp.Cells[i,4].Value:=ADOQuery1.Fields[3].Value;
把这句去掉就不会出现这种错误了，请高手解答，谢谢

[Kshape]

是不是你的值不匹配?

[Changefish]

ExcelApp.Cells[i,4].Value:=ADOQuery1.Fields[3].astring;

[yubing8]

没有用啊

[cdsgajxlp]

是不是数据有问题，这样看一下
var
str : string;

....

str:=ADOQuery1.Fields[3].astring;
showmessage(str);

[cdsgajxlp]

我想应该是类型之间的不匹配

[dzt1]

类型不匹配所置