Nov 28 2024, 06:21 PM, updated 3w ago
Then start writing code, just set the Interval of the timer in design time or run time.
For this example, the timer is set during run time:
CODE
Private Sub Form_Load()
Timer0.Interval= 3000
Timer0.Enabled=True
End Sub
Public Sub Timer0_Timer()
Beep
End Sub
Timer0.Interval= 3000
Timer0.Enabled=True
End Sub
Public Sub Timer0_Timer()
Beep
End Sub
And you will get this Form1 application running: (It is best if set Timer control to Visible=False)
But how about using timer in other programming language? For example, in native Windows, C++ code can directly access the Win32 API to set and kill timer with callback.
Below are some example code taken from: https :// learn.microsoft.com/en-us/windows/win32/winmsg/using-timers
Creating a Timer:
CODE
// Set two timers.
SetTimer(hwnd, // handle to main window
IDT_TIMER1, // timer identifier
10000, // 10-second interval
(TIMERPROC) NULL); // no timer callback
SetTimer(hwnd, // handle to main window
IDT_TIMER2, // timer identifier
300000, // five-minute interval
(TIMERPROC) NULL); // no timer callback
SetTimer(hwnd, // handle to main window
IDT_TIMER1, // timer identifier
10000, // 10-second interval
(TIMERPROC) NULL); // no timer callback
SetTimer(hwnd, // handle to main window
IDT_TIMER2, // timer identifier
300000, // five-minute interval
(TIMERPROC) NULL); // no timer callback
The callback to the GUI window is through WM_TIMER message in the window procedure.
(We have to familiar ourselves with window class, window procedure, message loop, message queue while working with GUI window in Windows)
CODE
case WM_TIMER:
switch (wParam)
{
case IDT_TIMER1:
// process the 10-second timer
return 0;
case IDT_TIMER2:
// process the five-minute timer
return 0;
}
switch (wParam)
{
case IDT_TIMER1:
// process the 10-second timer
return 0;
case IDT_TIMER2:
// process the five-minute timer
return 0;
}
Or if initializing the timer with callback to your own TimerProc procedure, the parameters to pass are a little different:
CODE
// Set the timer.
SetTimer(hwnd, // handle to main window
IDT_TIMER3, // timer identifier
5000, // 5-second interval
(TIMERPROC) MyTimerProc); // timer callback
SetTimer(hwnd, // handle to main window
IDT_TIMER3, // timer identifier
5000, // 5-second interval
(TIMERPROC) MyTimerProc); // timer callback
Destroying a Timer
CODE
// Destroy the timers.
KillTimer(hwnd, IDT_TIMER1);
KillTimer(hwnd, IDT_TIMER2);
KillTimer(hwnd, IDT_TIMER3);
KillTimer(hwnd, IDT_TIMER1);
KillTimer(hwnd, IDT_TIMER2);
KillTimer(hwnd, IDT_TIMER3);
This is the screenshot of the GUI window with timer I created in FASM:
(It will beep every 3 seconds, but I am not posting the code on here anyway)
WM_TIMER is a low-priority message among window messages like WM_PAINT.
Make sure messages like WM_PAINT does not block the message queue, or else WM_TIMER message cannot be read.
Do you have other example of programming language to share, as to how to use timer in your software project?
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