Native Development

[Jeff_Lu]

Here is my code,

void AlertListPage::onOnCallClicked()
{
	thread = new DownLoadThread();
	QThreadPool *pool = new QThreadPool();
	pool->start(thread,0);
}

class DownLoadThread: public QObject, public QRunnable {
	Q_OBJECT
public:
	DownLoadThread();
	virtual ~DownLoadThread();
	virtual void run();
...
...
}

cpp...

DownLoadThread::DownLoadThread() {
	// TODO Auto-generated constructor stub

}

DownLoadThread::~DownLoadThread() {
	// TODO Auto-generated destructor stub
	sta::out<<"test";
}

void DownLoadThread::run()
{
...
...
}

 I have set breakpoint at line:

pool->

start(thread,0);

and first line within Run() method.

once execute poo->start, and before going to run, it will throws can not access memory at address 0x0,

I can not see where i set Object as null...

Thanks.

[BikeAtor · Accepted solution]

Do you need a Threadpool and QRunnable? You could also use QThread -> http://qt-project.org/doc/qt-4.8/QThread.html

Do you initialize QObject in constructor? It doesn't look so, cause your Constructor doesn't need a QObject as parent. So maybe parent is NULL.

[Jeff_Lu]

Hi BikeAtor,

Thanks for your quick hint.

yes, you are right, QObject was not initlized and that cause problem.