[Qt-interest] Basic QThread question

[Sean Harmer]

Hi List,

this bounce message is not from me and frankly any email scanner that 
lets through a suspicious attachment simply because it has a different 
file extension is just simply broken by design.

Apologies if my actual message with an attachment creates additional 
noise on the list.

Sean

On 07/05/2010 09:15, Sean Harmer wrote:
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> ---
>
> Hi Phil,
>
> On 07/05/2010 08:38, Sean Harmer wrote:
>> Hi Phil,
>>
>> On 07/05/2010 02:31, Phil wrote:
>>> On Thu, 6 May 2010 07:40:49 pm Sean Harmer wrote:
>>>> Hi,
>>>>>
>>>>> Yes, but the OP does seem to get the code working but still running in
>>>>> the GUI thread. Based on my experience on a similar problem and
>>>>> referring to the previous list entry (see link in my first reply) this
>>>>> was the solution. Maybe this is not the case here, but it might be...
>>>>
>>>> I know what you mean, but let's wait and see if the OP posts some more
>>> of
>>>>     his main thread code as requested. :-)
>>>
>>> Thank you for the replies, more food for thought.
>>>
>>> I fear that I may not have stated the problem clearly enough. As I see it, the
>>> problem is in the original code that Sean kindly sent me. I wanted to know if
>>> there is a typo in this line:
>>>
>>>> connect( m_workerThread->poller(), SIGNAL( value( int ) ),
>>>>             this, SLOT( processValue( int ) ) );
>>>
>>> There isn't a poller() function and if I create one then this is the result:
>>
>> Yes there was:
>>
>> DevicePoller* poller() const { return m_poller; }
>>
>> It simply returns a pointer to the DevicePoller object that is a child
>> of the worker thread object.
>>
>>> "invalid use of void expression"
>>
>> Ah, maybe it is an ordering problem as the DevicePoller object is not
>> created until the run() function is called from the worker thread's
>> context. Before this, the pointer value will be 0.
>>
>> Bear with me for a few minutes and I will make a small application that
>> works but will just generate random numbers in a worker thread using the
>> above method. I'll post it to the list shortly for you, then all you
>> have to do is to insert the code that talks to your device.
>>
>> All that is missing is waiting for the DevicePoller object to be created
>> before connecting to it.
>
> Please try the attached application. Instead of querying your device it
> simply generates a random number. If you set breakpoints in the
> DataProcessor::processData(int x) and DevicePoller::poll() methods then
> look at the Threads debug view in creator you will see that this does
> work using two threads and that the "polling" is performed in the worker
> thread as expected. The main thread function simpy prints out the square
> of the random number generated by the worker thread.
>
> Hopefully this will allow you to get it working with your polling code.
> Just replace the call to qrand() % 10 with your own code.
>
> HTH,
>
> Sean
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