[Qt-interest] Timer objects conflicting
Mikhail Veygman
mveygman at gmail.com
Thu Aug 13 14:42:07 CEST 2009
Yuvaraj,
As Alex has stated the "conflict" doesn't explain the problem you are
having and further doesn't specify the symptoms of the problem, which
are needed.
Looking at the code, however, I think you need to change the design of
your application the reason being is: I would assume that you have only
one instance of the Form class and all the timers are created through it
so you are calling the same slot in the same object, so my suggestion
for you would be 1 of the 2 things:
1. Use a single timer and just have a list of flags on whether
something needs to be updated within the object and then update it based
on the flag being set to true.
2. Break up data handling into separate objects and create the timer
within the object so you are not attempting to update parameters within
the same object.
-
Regards,
Mikhail Veygman
-----Original Message-----
From: Malyushytsky, Alex <alex at wai.com>
To: qt-interest at trolltech.com <qt-interest at trolltech.com>
Subject: Re: [Qt-interest] Timer objects conflicting
Date: Wed, 12 Aug 2009 18:34:42 -0700
Thiago is right about static variable initialization and since your code mostly likely assumes that initial count should be 0,
it is mostly likely not a problem here. It still might be a problem in other cases. I can only guess.
I believe it is preferable to initialize static variable of the basic types (no constructors) even if it should be initialized to 0.
This will clearly state for the person reviewing your code that you did not forget to do it.
Comment can be used to get the same effect, but "= 0" is shorter.
This is more related to the style and I would not probably mentioned this, if code posted was not so hard to read due to lack indentation already.
Back to the problem.
As it was pointed already by John, the "conflict" does not explain the problem.
More of that, it is not clear what was intended to do.
You explanation does not provide information what you are trying to achieve.
It gives description how you are doing it.
Since there are endless possibilities "What" you want to achieve it is tough to help you.
For example if you wanted to show time passed from the click on the last button,
The only single timer supposed to be running at any time.
You have to stop previously running timer (if any), create a new one and change data to be displayed.
If you have parallel processes running, timers represents each process and click of the specific button just supposed to switching the data displayed into specific control, you do need multiple timers.
But only one timer at a time supposed to display the data, the one associated with specific process/button.
Regards,
Alex
-----Original Message-----
From: qt-interest-bounces at trolltech.com [mailto:qt-interest-bounces at trolltech.com] On Behalf Of John McClurkin
Sent: Wednesday, August 12, 2009 5:30 AM
To: qt-interest at trolltech.com
Subject: Re: [Qt-interest] Timer objects conflicting
Yuvaraj R wrote:
> Alex
>
> I am explaining my problem here..
>
>
> I am creating new object for Timer .whenever i am clicking the push
> button .I have set the timer timer interval 1000 sec..
>
> If timeout signal is emitted it will run_timer slot..
>
> Here i am counting the seconds and send to my main window...
>
>
> What my thing is ,when i am creating the second object for timer,it is
> conflicting with object 1..
Your statement is still not helpful because you don't describe what the
conflict is. So, I'll try with a couple of questions. 1) What happens
when you just click push button 1? 2) What happens when you click push
button 1 then click push button 2? 3)How is this different from what you
want to happen?
>
> And more thing.. How come i know,which object is emitting the timeout signal
You can use the sender() function in the run_timer slot. See the Qt
documentation.
>
>
>
> Thanks
>
> Yuvaraj R
>
> On Wed, Aug 12, 2009 at 4:55 AM, Malyushytsky, Alex <alex at wai.com
> <mailto:alex at wai.com>> wrote:
>
> I am not sure I followed what you were trying to achieve.
> I could assume something, based on your explanation, but if you want
> correct answer you need to ask correct question.
> What is worth "objects are conflicting.. " gives no explanation of
> the problem you are facing.
> Code provided does not give sufficient details to understand it.
> It might be a good idea to spend more formulating question if you
> want help.
>
> The only thing I can say right now:
> - static int count; is not initialized
> - time[count] = new QTimer; may create a problem depending on the
> container you are using.
>
> Regards,
> Alex
>
>
>
> From: qt-interest-bounces at trolltech.com
> <mailto:qt-interest-bounces at trolltech.com>
> [mailto:qt-interest-bounces at trolltech.com
> <mailto:qt-interest-bounces at trolltech.com>] On Behalf Of Yuvaraj R
> Sent: Tuesday, August 11, 2009 1:30 PM
> To: qt-interest
> Subject: [Qt-interest] Timer objects conflicting
>
> Hi All
>
> I have 10 items in list view.. Each widget containing the push
> button and label..
>
> when push button is clicked the Timer is running ..suppose if click
> the first item push button timer value is display at label..After
> some times again i am clicking second push button... this item value
> also i have to display..
>
> whenever user clicking the button, new object will be creating for
> QTimer..Here my problem is objects are conflicting..
>
> My code is
>
> void Form::get_timer(int id)
> {
> static int count;
> qDebug() << "yuvaraj";
> time[count] = new QTimer;
> time[count]->start(1000);
> QObject::connect(time[count],SIGNAL(timeout()),this,SLOT(run_timer()));
> count++;
> }
> void Form::run_timer()
> {
> qDebug() << "yuvaraj 1";
> QString time_count;
> if(b==59 )
> {
> b=0;
> a++;
> }
> if(a<10 && b<10 )
> {
> time_count = QString(QString::number(0)+QString::number(a) +
> ":"+QString::number(0)+QString::number(b));
> }
> if(a<10 && b >=10)
> {
> time_count = QString(QString::number(0)+QString::number(a) +
> ":"+QString::number(b));
> }
> if(a>=10 && b <10)
> {
> time_count = QString(QString::number(a) +
> ":"+QString::number(0)+QString::number(b));
> }
> if(a>=10 && b>=10)
> {
> time_count = QString(QString::number(0)+QString::number(a) +
> ":"+QString::number(b));
> }
> b++;
> emit send_timer(count,time_count);
> }
>
> // slot for send_timer signal
> void MainWindow:: get_timer(int item,QString str)
> {
> qDebug() << "yuvaraj" << str << item;
> for(int i=0;i<list..size();i++)
> {
> if(i == list_item_id[item])
> {
> list.at <http://list.at/>(i)->m_ui->set_time->setText(str);
> }
> }
>
> Please help me ,how do avoid the object conflicting
>
>
> Thanks
>
>
> Yuvaraj R
>
>
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