Creating a Custom Dialog, and Returning Multiple QString's

[nile.one]

you can provide some bool flags or even status function, which will describe the child object' state.

simple example:

enum State
{
 Idle = 0,
 Running,
 Error
};
 
int currentState(); //returns current state from State enum
 
State _state; //variable for storing current state

enum State
{
 Idle = 0,
 Running,
 Error
};

int currentState(); //returns current state from State enum

State _state; //variable for storing current state

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then you can check child' state or even block parent object waiting for state changes.
for example

ChildObject obj;
obj.run();
 
while(ChildObject::Running == obj.currentState)
 qApp->processEvents();
 
...

ChildObject obj;
obj.run();

while(ChildObject::Running == obj.currentState)
 qApp->processEvents();

...

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and another Qt-styled solution is using signal-slot connection, which is of course the best one.