Actia
asked on
TTimer created by TThread
I've got such a Thread:
TReadRespThread = class(TThread)
private
{ Private declarations }
Timer : TTimer;
procedure NewTimer1Timer(Sender: TObject);
protected
procedure Execute; override;
public
end;
procedure TReadRespThread.Execute;
begin
inherited;
Timer := TTimer.Create(Application)
Timer.Interval := 100;
Timer.OnTimer := NewTimer1Timer;
Timer.Enabled := True;
end;
procedure TReadRespThread.NewTimer1T
begin
//for some reason the program flow never comes here
end;
1. Why doesn't it work?
2. Is such a Timer running in a separate thread (not in the main thread)?
Jackie boy :-)
TReadRespThread = class(TThread)
private
{ Private declarations }
Timer : TTimer;
procedure NewTimer1Timer(Sender: TObject);
protected
procedure Execute; override;
public
end;
procedure TReadRespThread.Execute;
begin
inherited;
Timer := TTimer.Create(Application)
Timer.Interval := 100;
Timer.OnTimer := NewTimer1Timer;
Timer.Enabled := True;
end;
procedure TReadRespThread.NewTimer1T
begin
//for some reason the program flow never comes here
end;
1. Why doesn't it work?
2. Is such a Timer running in a separate thread (not in the main thread)?
Jackie boy :-)
SOLUTION
membership
This solution is only available to members.
To access this solution, you must be a member of Experts Exchange.
A timer in a thread is ridiculous. What do you want to achieve?
ASKER
A timer in a thread is ridiculous. What do you want to achieve?
*** The reason is:
I have a dll with some functions inside. I have also the demo application showing how to use them. In this demo application there is a TTimer with Interval := 100, OnTimer it triggers function to check the values of a variable populated by the functions from the dll.
Unfortunatelly there is no way to catch the moment where this variable is populated, that is why the TTimer checks it.
I have the old application which works fine with the old hardware. My task is to make it work with the new hadware (using the dll). The way it works now is:
it sends command to the hardware using WriteFile function
it receives the response using ReadFile
It would be great to replace these Windows commands with functions from DLL,
it would save a huge amount of work.
So my plan was to:
1. Send a command using dll function (it works fine)
2. Run TTimer in working thread to check if we have a response with 100 ms intervals
3. When we got then CreateEvent(MyEvent);
4. In main thread: WaitForSingleObject(MyEven
(WaitForSingleObject blocks the main thread and this is why I can't use TTimer put on the Form).
Provide the old application with the response adjusted to the variable it works with now.
hope I explained it properly
Jackie boy
*** The reason is:
I have a dll with some functions inside. I have also the demo application showing how to use them. In this demo application there is a TTimer with Interval := 100, OnTimer it triggers function to check the values of a variable populated by the functions from the dll.
Unfortunatelly there is no way to catch the moment where this variable is populated, that is why the TTimer checks it.
I have the old application which works fine with the old hardware. My task is to make it work with the new hadware (using the dll). The way it works now is:
it sends command to the hardware using WriteFile function
it receives the response using ReadFile
It would be great to replace these Windows commands with functions from DLL,
it would save a huge amount of work.
So my plan was to:
1. Send a command using dll function (it works fine)
2. Run TTimer in working thread to check if we have a response with 100 ms intervals
3. When we got then CreateEvent(MyEvent);
4. In main thread: WaitForSingleObject(MyEven
(WaitForSingleObject blocks the main thread and this is why I can't use TTimer put on the Form).
Provide the old application with the response adjusted to the variable it works with now.
hope I explained it properly
Jackie boy
ASKER CERTIFIED SOLUTION
membership
This solution is only available to members.
To access this solution, you must be a member of Experts Exchange.
ASKER
This is almost exactly what I implemented! :-)
And this is USB device :-)
Jackie boy
And this is USB device :-)
Jackie boy
Hi,
you can use the JCL TThreadTimer Component from the the JCL Threading.
you may download it from here
http://sourceforge.net/project/showfiles.php?group_id=45786
you can use the JCL TThreadTimer Component from the the JCL Threading.
you may download it from here
http://sourceforge.net/project/showfiles.php?group_id=45786
sorry
Tell me more about the device directly (robert_marquardt att gmx dott de). I am always interested in USB devices.
JCl component for Threaded timer has a bug if you disable the time inside the ontimer function.