[Qt-interest] [SOLVED] Maintaining a map of QProcesses

[Wm. G. Urquhart]

Wm. G. Urquhart wrote:
> Wm. G. Urquhart wrote:
>> Hi,
>>
>> I have an application that I want to use to launch other processes from 
>> based on the user's actions. These processes will be an instance of the 
>> same application but with different parameters passed to them. For 
>> example "Notepad.exe" "text1.txt" and "Notepad.exe" "text2.txt".
>>
>> At present I'm keeping the * of the process in a map along with an ID as 
>> the key but ideally, what I'd like to be able to do is when any of the 
>> processes state changes I would like to be notified of this so I can 
>> clean up my UI and perform housekeeping on the map. I know there is a 
>> stateChange slot but how to tie this all together and knowing which 
>> process raised it is where I'm confused.
>>
>> I'd really appreciate your thoughts on this.
> 
> While working on a solution I have a class derived from QObject and in 
> the classes constructor I want to connect the various signals from the 
> QProcess to their slots.
> 
> However, connect(...) returns false when I try this even though IFAICT 
> it should work. On page 311 of the C++ GUI Programming with Qt4 book 
> they are doing something similar only using QDialog.
> 
> if (!connect(m_Process, SIGNAL(stateChanged(QProcess::ProcessState)), 
> this, SLOT(processDone(QProcess::ProcessState))))
>      {
>          ::QMessageBox::critical(0, "Oops", "Unable to connect slot!") ;
>      }
> 
> I have tried using QProcess as both a pointer and reference, but neither 
> work. Does anyone have any idea to what or where I'm going wrong?


Sometimes I wonder why I get up in the morning! I'd neglected to include 
the Q_OBJECT macro in the class, oops.

-- 
William