QT Custom Sleep delay function (cleverly uses the time difference, but this seems to be the CPU is full of cells, rather than sleeping)

QT does not, like VC + + WIN32/MFC programming, provide a ready-made sleep function to call. Qt encapsulates the sleep function in the Qthread class. A child thread can call the sleep function. But what if the user wants to implement the delay function in the main thread? method is to customize the sleep delay function. The time difference is realized by Qdatetime.

#include <QDateTime>

void MainWindow :: sleep (int msec) // Custom Qt delay function, unit millisecond
{
     QDateTime last = QDateTime :: currentDateTime ();
     QDateTime now;
     while (1)
     {
         now = QDateTime :: currentDateTime ();
         if (last.msecsTo (now)> = msec)
         {
             break;
         }
     }
} 

http://blog.csdn.net/libaineu2004/article/details/39161697

QT Custom Sleep delay function (cleverly uses the time difference, but this seems to be the CPU is full of cells, rather than sleeping)