第二次单击按牛后出错!郁闷ing!(MSN控件,附原码),错误信息:“access violation at address 004de5be in module '...exe',read of address 000000000!”procedure TFrmyxgl.N4Click(Sender: TObject);
var txt:string;
begin
with ADOQuery2 do
begin
ADOQuery2.Close;
ADOQuery2.SQL.Clear;
sql.add(' SELECT help_text FROM help where m_id=1');
try
ADOQuery2.open;
if not eof then
begin
txt:=ADOQuery2.Fields.Fields[0].AsString ;
MSNPopUp1.Title:='院系管理-帮助';
MSNPopUp1.Text:=txt;
MSNPopUp1.ShowPopUp;
end;
except
end;
ADOQuery2.Free;
MSNPopUp1.Free
end;
end;
var txt:string;
begin
with ADOQuery2 do
begin
ADOQuery2.Close;
ADOQuery2.SQL.Clear;
sql.add(' SELECT help_text FROM help where m_id=1');
try
ADOQuery2.open;
if not eof then
begin
txt:=ADOQuery2.Fields.Fields[0].AsString ;
MSNPopUp1.Title:='院系管理-帮助';
MSNPopUp1.Text:=txt;
MSNPopUp1.ShowPopUp;
end;
except
end;
ADOQuery2.Free;
MSNPopUp1.Free
end;
end;
var txt:string;
begin
with ADOQuery2 do
begin
ADOQuery2.Close;
ADOQuery2.SQL.Clear;
sql.add(' SELECT help_text FROM help where m_id=1');
try
ADOQuery2.open;
if not eof then
begin
txt:=ADOQuery2.Fields.Fields[0].AsString ;
MSNPopUp1.Title:='院系管理-帮助';
MSNPopUp1.Text:=txt;
MSNPopUp1.ShowPopUp;
end;
except
end;
ADOQuery2.Free;
MSNPopUp1.Free //错在这里。去掉应该就可以了
end;
end;
MSNPopUp1.Free
MSNPopUp1.Free;//着行不去,msn就不会二次显示!。