Assignment 2 - Question 1

thread should run for a fixed time from when it was started unless it was explicitly stopped by the user.

How long did you all run the thread and how did you check? Just have a counter to count the number of fluctuations? Or is there a way to time a thread running time?

You could either use a counter or store the starting time and compare the current time to the starting time. Just remember to make your data reads and writes atomic in re-entrant functions

I forgot about the QTimer class. If you need a specific time period to lapse, you can use the QTimer:: slingshot static function.

I just let it run to generate 200 numbers each time start is pressed. If the user presses stop and then start then the counter is reset to 200.

hallo guys

having trouble with compiler, maybe you can help?

in my file "stockMarcketWatch.h" I have the following code:

Language: C++ (QT)
#include <QTimer>
 
 
class StockMarketWatch : public QTimer {
	Q_OBJECT
public slots:
	void updateStockPrice();
};

but this gives me a linker error.
to get by this I can remove the Q_OBJECT macro, then it compiles,
but will my slot still work?

Your slot won't work without the Q_OBJECT macro.

If you say you're getting a linker error[1] then I'm assuming the error itself has something to do with QMetaObject. I would hazzard that the auto-generated file moc_StockMarketWatch.cpp is not being included in your compile/link. If you're using Dev-C++, try regenerating your project file (ie using qmake).

I'm lazy, I use VS2008 and I've got the Qt add-in. Every time I make a change that would involve MOC, the plugin automatically does necessary changes to the project settings for me. Other IDEs don't always do this and you have to regenerate the project file manually.



[1] In future, if you get an error message from the compiler or the linker, please include the error message with your post. It often helps diagnose the problem.