timer

问题 I know scanf waits for input. But in this program I have written it is printing hello in an infinite loop. Its not waiting for me to enter. #include <signal.h> #include <stdio.h> #include <string.h> #include <sys/time.h> #include<unistd.h> void timer_handler (int signum) { static int count = 0; printf ("timer expired %d times\n", ++count); } int main () { struct sigaction sa; struct itimerval timer; memset (&sa, 0, sizeof (sa)); sa.sa_handler = &timer_handler; sigaction (SIGALRM, &sa, NULL);

问题 I know scanf waits for input. But in this program I have written it is printing hello in an infinite loop. Its not waiting for me to enter. #include <signal.h> #include <stdio.h> #include <string.h> #include <sys/time.h> #include<unistd.h> void timer_handler (int signum) { static int count = 0; printf ("timer expired %d times\n", ++count); } int main () { struct sigaction sa; struct itimerval timer; memset (&sa, 0, sizeof (sa)); sa.sa_handler = &timer_handler; sigaction (SIGALRM, &sa, NULL);

问题 I have a paintComponent method, inside a class.It makes a grid of 10*10. And I want to lower the frame rate, so that every time the function colors a rectangle in the grid, I can see the progression public void paint(Graphics g1) { super.paint(g1); Graphics2D g= (Graphics2D) g1; for(Object a: Maze_Generator.list) { Cell c =(Cell)a; if(c.top()) g.drawLine(c.x(), c.y(), c.x()+c.length(), c.y()); if(c.bottom()) g.drawLine(c.x(), c.y()+c.length(),c.x()+c.length(),c.y()+c.length()); if(c.left()) g

问题 I have a paintComponent method, inside a class.It makes a grid of 10*10. And I want to lower the frame rate, so that every time the function colors a rectangle in the grid, I can see the progression public void paint(Graphics g1) { super.paint(g1); Graphics2D g= (Graphics2D) g1; for(Object a: Maze_Generator.list) { Cell c =(Cell)a; if(c.top()) g.drawLine(c.x(), c.y(), c.x()+c.length(), c.y()); if(c.bottom()) g.drawLine(c.x(), c.y()+c.length(),c.x()+c.length(),c.y()+c.length()); if(c.left()) g

问题 I'm working on Timers app and cannot understand how I can make work multiple timers for each cell. I start and pause timers at didSelectRowAt: override func tableView(_ tableView: UITableView, didSelectRowAt indexPath: IndexPath) { tableView.deselectRow(at: indexPath, animated: true) let cell = tableView.cellForRow(at: indexPath) as! TimerTableViewCell let item = timers.items[indexPath.row] item.toggle() print(item) startPauseTimer(for: cell, with: item) } And this is my code for

问题 Using NetBeans 7.1 / GlassFish 3.1, I created a new TimerSessionBean. @Stateless public class NewTimerSessionBean implements NewTimerSessionBeanLocal { @Schedule(minute = "*", second = "0", dayOfMonth = "*", month = "*", year = "*", hour = "9-17", dayOfWeek = "Mon-Fri") @Override public void myTimer() { System.out.println("Timer event: " + new Date()); } } How can I declare that the timer is non-persistent? http://www.theserverside.com/news/1363578/EJB-31-A-Significant-Step-Towards-Maturity

问题 How do timers work in PLC Structured Text (ST)? How do we declare them? I've been studying a standard of PLC (IEC 61131-3), and they do not speak about timers in ST. I know the great majority of PLC programmers do them in ladder logic, but in this particular case I really need to declare timers in ST. I am using a Rockwell PLC. 回答1: You can find explanations about timers and how to use (declare) it in the help system of your IDE. For example, in the CODESYS help you can read about timers of

问题 I have created a C# Windows Service application that starts a FileSystemWatcher to monitor a directory for the creation of a file. When the file is found I instantiate a custom class that parses the file (CSV) and calls a web service with it's contents. The service is somewhat asynchronous and returns a unique number which must be used for subsequent calls to check its progress. In my process class I create a timer to continually check to see if the job is finished. I am dispose ing and close

问题 I need a timer in Python which i can reset (timer.reset()). I already have a periodic timer. Is there a library with such a timer? class MyTimer(threading.Timer): def __init__(self, t): threading.Thread.__init__(self) self.__event = threading.Event() self.__stop_event = threading.Event() self.__intervall = t def run(self): while not self.__stop_event.wait(self.__intervall): self.__event.set() def clear(self): self.__event.clear() def is_present(self): return self.__event.is_set() def cancel

问题 I need a timer in Python which i can reset (timer.reset()). I already have a periodic timer. Is there a library with such a timer? class MyTimer(threading.Timer): def __init__(self, t): threading.Thread.__init__(self) self.__event = threading.Event() self.__stop_event = threading.Event() self.__intervall = t def run(self): while not self.__stop_event.wait(self.__intervall): self.__event.set() def clear(self): self.__event.clear() def is_present(self): return self.__event.is_set() def cancel