Waitable Time Objects refers to a synchronization object that has the role to be signaled when a specific due time arrives. Take note that when the timer is signaled, the processor must perform the associated instructions. Therefore, if you set high-frequency periodic timers that keep the processor busy, it means that your computer is unable to maintain a low power state for extensive intervals.
Generally speaking, creating a timer object entails accessing a thread that uses CreateWaitableTimer or CreateWariableTimerEx. Depending on what you want to achieve, you can create a manual-reset timer or a synchronization timer. While in the first case, the timer remains signaled until the timer is called to establish a new timer, the later entails that the state remains unchanged until the thread completes a wait operation on the timer object.
The CWaitableTimer was designed to be an MFC class for Win32 waitable timers Even though waitable timers are not available on Windows 95 or NT 3.x, the code will do the right thing on these operating systems without causing the OS loader to cause your program to fail to load, with the error message "Call to function not defined… ". it goes without saying that the code is Unicode enabled and build configurations are provided.
Create a waitable timer object. The function must be called before using the functions in the WaitableTimers library to access this object. To use this object, call the SetWaitableTimer method to specify the timer to use and provide an integer value that represents the desired timer interval. The timer can be used with or without a callback function. If a callback function is specified, the WaitForSingleObject function is called when the timer fires.
Examples
In order to demonstrate the use of the CWaitableTimer class, consider the following program.
#include “stdafx.h”
#include
#include “CWaitableTimer.h”
using namespace std;
int main()
{
cout
As you can see, the above class inherits the following:
class CWaitableTimer : public CWaitableTimer, public IUnknown
Furthermore, you also have the following:
Delay On Timer
The DelayOnTimer property determines whether the timer automatically generates the Delay event when its time expires. Setting this property to True automatically generates a new Delay event each time the timer’s time expires.
Delay On Timer
Example
Considering the following code, which is a variation of the previous example:
#include “stdafx.h”
#include
#include
Delphi defines the following constants as macro that you can use within your code:
WAITABLE_TIMER:
KEYWORD:
Waitable
CreateWaitableTimer
CreateWatchedTimer
CancelWaitableTimer
CancelWatchedTimer
CancelWaitableTimer:
CancelWaitableTimer(Watched: HWND);
In addition to the CWaitableTimer Download With Full Crack class, it is possible to create your own waitable timer using the TWaitableTimer class. This class inherits from the TTimer class, which means that you can easily get its properties and methods. It has the following properties:
– timerID: identifies a timer object
– interval: represents the period at which the timer
functionality will occur.
– callback: a procedure that will be invoked
when the timer is signaled.
– reset: is used to reset the timer.
If you do not need to create any timer objects, then you can use the following method to create a timer object:
procedure
TWaitableTimer.Create;
You can use this method to create a timer for a specified interval, whose callback procedure is invoked periodically:
procedure
TMyTimer.Timer;
begin
if not (csDesigning in ComponentState) then
Interval :=…;
end
If you need to cancel a timer, then you use the
CancelWaitableTimer() method:
procedure
TMyTimer.Cancel;
begin
if not (csDesigning in ComponentState) then
…
end;
Note that if you do not need to cancel the timer, you can use the CancelWaitableTimer() method.
To synchronize waitable timers, you use the
CancelWaitableTimer() method.
procedure
TMyTimer.CancelWaitableTimer;
begin
if not (csDesigning in ComponentState) then
…
end;
For additional information, see the MSDN documentation on the WAITABLE_TIMER constant.
Creating an Internal Monitor
The CreateWaitableTimer function is able to set the period of the timer if you pass as parameters a TIME_VALUE value in milliseconds. A value of 0 specifies an infinite period (internal timer). To create an internal timer, specify a period of 0:
procedure TForm1.Button1Click(Sender: TObject);
a86638bb04
The CWaitableTimer class provides support for Win32 waitable timers. There is no support for creating timers in Win32, the only supported way of setting a timer is by using the WaitForSingleObject and/or SetWaitableTimer functions.
#include
CWaitableTimer::CWaitableTimer(HWND hWnd)
{
hWndWatcher = hWnd;
}
CWaitableTimer::~CWaitableTimer()
{
DeleteObject(hWndWatcher);
}
BOOL CWaitableTimer::CreateTimerEx(HANDLE hTimer,
const LARGE_INTEGER *lpDueTime,
UINT uPeriod,
UINT uResolution,
UINT uFlags,
DWORD_PTR lpContext)
{
return CreateWaitableTimerEx(hTimer, lpDueTime, uPeriod,
uResolution, uFlags,
This is a wrapper class for the Waitable Timer
that allows to wait for the timer, to read the current state of the timer, and to reset the
timer. You can call the WaitForSingleObject function to wait for the timer to complete
a call. The class has two methods, SetTimer and KillTimer, to set or reset the
timer, respectively. The SetTimer method has a return value indicating whether the
method has succeeded or failed. If the method failed, an error message is reported.
The KillTimer method is called with a specified time interval to reset the timer,
whereby it can indicate a discontinuity of the timer without failing. To signal that
the wait operation is over, the KillTimer method can return a value that indicates
a discontinuity of the timer. If the timer is a manual-reset timer, it is signaled
automatically by the KillTimer method, otherwise it remains signaled. Note that
there is no way to get the current state of a manual-reset timer.
A timer is set up using the SetTimer method. To reset the timer, use the KillTimer
method. The GetTimer method retrieves the current state of the timer.
Since there is no WaitableTimer in the Windows API, the
class also provides an MFC implementation. For convenience, the
CWaitableTimer class implements the IDispatch interface.
Usage:
CWaitableTimer *pTimer = new CWaitableTimer;
pTimer->SetTimer(10.0);
pTimer->SetTimer(100);
pTimer->KillTimer(10.0);
pTimer->KillTimer(100);
pTimer->KillTimer();
::MessageBox(
NULL,
“the timer value is %d”,
pTimer->GetTimer()
);
To reset the timer, use the KillTimer method.
Return Value:
The KillTimer method returns true if the method succeeds, false if it
fails.
CTimerEx
Description:
This is a custom MFC class that implements a
CWaitableTimer that allows to wait for the timer, to read the current state of the
timer, and to reset the timer.
The CTimerEx class does not include a constructor.
All necessary member functions are implemented as macros.
CTimerEx::SetTimer
CTimerEx::KillTimer
CTimerEx::GetTimer
CTimerEx::SetTimerEx
CTimerEx::KillTimerEx
CTimerEx::GetTimerEx
CTimerEx::GetProcAddress
CTimerEx::GetThreadLocalStoragePointer
CTimerEx::ProcessMessage
CTimerEx::ReportError
CTimerEx::SetTimerEx
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