About the QT console program

Source: Internet
Author: User

Create a QT console program, use a class object such as TestClass TC, then run, then close the console, why the TestClass destructor is not executed.

int main (int argc, char *argv[])
{
	qcoreapplication A (argc, argv);
	TestClass TC;
	return a.exec ();
}
However, if qcoreapplication is not applicable, and return 1 directly, the destructor can be executed. Why does the QT console program not call the destructor? Does it have a problem with memory management?

Of course not, it is in the wrong way, a.exec () will enter the QT EventLoop, equivalent to an infinite loop. When the console is closed, it is tantamount to forcing the program to exit without executing the program in sequence. So, I understand that the right way to use it is to call the exit quit, close, or exit methods when you want to quit. Like what

<pre name= "code" class= "CPP" >int main (int argc, char *argv[])
{
	qcoreapplication A (argc, argv);
	TestClass TC;
	Qtimer T;
	T.connect (&t, SIGNAL (timeout ()), &a, SLOT (Quit ()));
	T.start (+);
	return a.exec ();
}
 

Contact Us

The content source of this page is from Internet, which doesn't represent Alibaba Cloud's opinion; products and services mentioned on that page don't have any relationship with Alibaba Cloud. If the content of the page makes you feel confusing, please write us an email, we will handle the problem within 5 days after receiving your email.

If you find any instances of plagiarism from the community, please send an email to: info-contact@alibabacloud.com and provide relevant evidence. A staff member will contact you within 5 working days.

A Free Trial That Lets You Build Big!

Start building with 50+ products and up to 12 months usage for Elastic Compute Service

  • Sales Support

    1 on 1 presale consultation

  • After-Sales Support

    24/7 Technical Support 6 Free Tickets per Quarter Faster Response

  • Alibaba Cloud offers highly flexible support services tailored to meet your exact needs.