I have a Windows Forms application written in C#. The following function checks whenever printer is online or not:
public void isonline()
{
PrinterSettings settings = new PrinterSettings();
if (CheckPrinter(settings.PrinterName) == "offline")
{
pictureBox1.Image = pictureBox1.ErrorImage;
}
}
and updates the image if the printer is offline. Now, how can I execute this function isonline()
every 2 seconds so when I unplug the printer, the image displayed on the form (pictureBox1
) turns into another one without relaunching the application or doing a manual check? (eg. by pressing "Refresh" button which runs the isonline()
function)
Threaded:
/// <summary>
/// Usage: var timer = SetIntervalThread(DoThis, 1000);
/// UI Usage: BeginInvoke((Action)(() =>{ SetIntervalThread(DoThis, 1000); }));
/// </summary>
/// <returns>Returns a timer object which can be disposed.</returns>
public static System.Threading.Timer SetIntervalThread(Action Act, int Interval)
{
TimerStateManager state = new TimerStateManager();
System.Threading.Timer tmr = new System.Threading.Timer(new TimerCallback(_ => Act()), state, Interval, Interval);
state.TimerObject = tmr;
return tmr;
}
Regular
/// <summary>
/// Usage: var timer = SetInterval(DoThis, 1000);
/// UI Usage: BeginInvoke((Action)(() =>{ SetInterval(DoThis, 1000); }));
/// </summary>
/// <returns>Returns a timer object which can be stopped and disposed.</returns>
public static System.Timers.Timer SetInterval(Action Act, int Interval)
{
System.Timers.Timer tmr = new System.Timers.Timer();
tmr.Elapsed += (sender, args) => Act();
tmr.AutoReset = true;
tmr.Interval = Interval;
tmr.Start();
return tmr;
}
You can do this easily by adding a Timer to your form (from the designer) and setting it's Tick-function to run your isonline-function.
The most beginner-friendly solution is:
Drag a Timer from the Toolbox, give it a Name, set your desired Interval, and set "Enabled" to True. Then double-click the Timer and Visual Studio (or whatever you are using) will write the following code for you:
private void wait_Tick(object sender, EventArgs e)
{
refreshText(); // Add the method you want to call here.
}
No need to worry about pasting it into the wrong code block or something like that.
Source: Stackoverflow.com