Re: [fpc-pascal] Getting Last User Input reliably
On 12/5/21 11:10 AM, James Richters via fpc-pascal wrote: So the only thing I need to consider is times of longer than 49.7 days without user input... because if it was exactly 50 days, it would look like 0.3 days as the first rollover would be forgotten. To take care of this I can just check it in my main program loop and keep updating my own datetime variable of last user input. i don't understand why you are keeping up with user input times by counting ticks... you said that one second accuracy is just fine so Keep It Simple, man, and don't over engineer it... grab the unix timestamp NOW each time they input something and store that... when you want to know how long it has been since their last input, just subtract lastUserInputTime from currentNow and you have your elapsed time... if you use a 32bit signed variable, you still have 17 years before you have to even think about a rollover... in this day in age, i'd use a 64bit signed variable along with the 64bit unix time routines and not worry about it for the next 292 billion years ;) -- NOTE: No off-list assistance is given without prior approval. *Please keep mailing list traffic on the list where it belongs!* ___ fpc-pascal maillist - fpc-pascal@lists.freepascal.org https://lists.freepascal.org/cgi-bin/mailman/listinfo/fpc-pascal
Re: [fpc-pascal] Getting Last User Input reliably
James Richters via fpc-pascal schrieb am
So., 5. Dez. 2021, 19:06:
> Is there some way I can do {$Q-} before my check then restore it to
> whatever it was before after it? (for example if it was already set to
> {$Q-} in the compiler, I would not want to turn it back on)
> Is there a way to do a temporary override for the one line?
>
{$push}
{$Q-}
// whatever code you need
{$pop}
Regards,
Sven
>
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Re: [fpc-pascal] Getting Last User Input reliably
Thanks for the explanation. This works the way I want it to... working with the rollover without causing an overflow error even if I leave overflow checking turned on. DWord((QWord(GetTickCount) - QWord(Last_Input_Info.dwTime)) AND $) James ___ fpc-pascal maillist - fpc-pascal@lists.freepascal.org https://lists.freepascal.org/cgi-bin/mailman/listinfo/fpc-pascal
Re: [fpc-pascal] Getting Last User Input reliably
Oh I see.. it does work on DWord.. I was testing it with constants:
Writeln($FFFE+$0006);
But I think the compiler resolved this so it would never create a overflow
error..
When I do it with variables now I get the overflow and I can control it with
{$Q-} and {$Q+}
Is there some way I can do {$Q-} before my check then restore it to whatever it
was before after it? (for example if it was already set to {$Q-} in the
compiler, I would not want to turn it back on)
Is there a way to do a temporary override for the one line?
I'm trying to figure out how to make a generic function for this that will work
regardless of what is set in the compiler without changing the rest of the
program.
I Thought I could put the result into a Qword then just AND it with $
and put that into my DWord... that seems like it would make it work even if
overflow checking was on...
But when I tried this with a little sample program, I still got the runtime
error 215... I don't know why, because I was putting the answer into a Qword.
var
num1,num2:dword;
QWresult:Qword;
DWresult:Dword;
begin
num1:=8;
num2:=$FFFE;
QWresult:=QWord(num1+num2);//Generates runtime 215
DWresult:=(QWresult AND $);
writeln(DWresult);
end.
But if I do
QWresult:=(QWord(num1)+QWord(num2));
It does not
So I'm wondering why
QWresult:=QWord(num1+num2);
Did not work as I expected it to.
James
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Re: [fpc-pascal] Getting Last User Input reliably
On 05/12/2021 17:10, James Richters via fpc-pascal wrote: I did some tests and went to go turn on Overflow checking just to see what would happen... and noticed it was on already... but I noticed it's called "Integer Overflow Checking" which seems it would not apply to things specifically set as DWord. I did some searches and didn't come across any overflow checking that wasn't for integers. Am I missing something? Or is this not even an issue because there is no overflow checking for DWord variables anyway? See https://gitlab.com/freepascal.org/fpc/source/-/issues/25201 (first comment) Jonas ___ fpc-pascal maillist - fpc-pascal@lists.freepascal.org https://lists.freepascal.org/cgi-bin/mailman/listinfo/fpc-pascal
Re: [fpc-pascal] Getting Last User Input reliably
Indeed keeping it a DWord solves all the problems for any amount of time less than the 49.7 day rollover time and I don't even have to check for the rollover because it takes care of itself by doing unsigned arithmetic. Is there even such a thing as overflow checking for DWord variables? I did some tests and went to go turn on Overflow checking just to see what would happen... and noticed it was on already... but I noticed it's called "Integer Overflow Checking" which seems it would not apply to things specifically set as DWord. I did some searches and didn't come across any overflow checking that wasn't for integers. Am I missing something? Or is this not even an issue because there is no overflow checking for DWord variables anyway? So the only thing I need to consider is times of longer than 49.7 days without user input... because if it was exactly 50 days, it would look like 0.3 days as the first rollover would be forgotten. To take care of this I can just check it in my main program loop and keep updating my own datetime variable of last user input. This way I'm checking it often enough that I can't ever have more than one rollover between checks.. and the math all fixes itself... after being sure to keep it all Dword My program will be running anyway... and even if it's not it won't matter because I will cause user input when I start it. James ___ fpc-pascal maillist - fpc-pascal@lists.freepascal.org https://lists.freepascal.org/cgi-bin/mailman/listinfo/fpc-pascal
Re: [fpc-pascal] Getting Last User Input reliably
El 3/12/21 a les 18:37, Dennis Lee Bieber via fpc-pascal ha escrit: Detection is normally done by: if current tick is less than saved tick, roll-over has occurred. Make adjustments to the delta. There is no need to do that, just make sure you're using DWORDs (i.e. unsigned arithmetic) everywhere and disable overflow checking. Bye -- Luca ___ fpc-pascal maillist - fpc-pascal@lists.freepascal.org https://lists.freepascal.org/cgi-bin/mailman/listinfo/fpc-pascal
Re: [fpc-pascal] Getting Last User Input reliably
El 3/12/21 a les 16:41, Travis Siegel via fpc-pascal ha escrit: If there's some sort of a configuration file, just write out the time/date info at the time of leaving the input, then when that routine gets called again, grab the current time/date, and perform a comparison. That should allow you to bypass any roll overs of any kind (unless it goes past the operating system's time keeping abilities), which isn't likely. I suppose he wants to check for any activity, not just for input directed at his application. One possibility is to have a thread calling GetLastInputInfo cyclically (say, every second or every half second), if the dwTime changed just register the current GetTickCount64 as the time of the input. That should work unless the new input happens exactly after 49.7 days (that's the rollover time, not 25 days) from the last one, at the same, exact, millisecond. Quite improbable but not impossible. Oh, and keep in mind that in older versions of windows there's no GetTickCount64, the rtl simulates it by using.GetTickCount. Windows Vista and above should be fine though. Bye -- Luca ___ fpc-pascal maillist - fpc-pascal@lists.freepascal.org https://lists.freepascal.org/cgi-bin/mailman/listinfo/fpc-pascal
Re: [fpc-pascal] Getting Last User Input reliably
If there's some sort of a configuration file, just write out the time/date info at the time of leaving the input, then when that routine gets called again, grab the current time/date, and perform a comparison. That should allow you to bypass any roll overs of any kind (unless it goes past the operating system's time keeping abilities), which isn't likely. On 12/3/2021 10:30 AM, Luca Olivetti via fpc-pascal wrote: El 3/12/21 a les 14:52, James Richters via fpc-pascal ha escrit: I'm trying to get the time lapsed since the last user input with keyboard or mouse on a Windows PC. For this I am doing: GetLastInputInfo(Last_Input_Info); IdleTime:= (GetTickCount - Last_Input_Info.dwTime) DIV 1000; I was going to suggest IdleTime:= DWORD(GetTickCount - Last_Input_Info.dwTime) DIV 1000; but then I saw On top of all this, I need to allow for the possibility that there was no user input for more than 25 days.. which is quite likely. so that's not going to work, sorry. I'm using the above for short intervals and it works in spite of the rollover (unless you enabled overflow checking, but that's another issue). Bye ___ fpc-pascal maillist - fpc-pascal@lists.freepascal.org https://lists.freepascal.org/cgi-bin/mailman/listinfo/fpc-pascal
Re: [fpc-pascal] Getting Last User Input reliably
El 3/12/21 a les 14:52, James Richters via fpc-pascal ha escrit: I'm trying to get the time lapsed since the last user input with keyboard or mouse on a Windows PC. For this I am doing: GetLastInputInfo(Last_Input_Info); IdleTime:= (GetTickCount - Last_Input_Info.dwTime) DIV 1000; I was going to suggest IdleTime:= DWORD(GetTickCount - Last_Input_Info.dwTime) DIV 1000; but then I saw On top of all this, I need to allow for the possibility that there was no user input for more than 25 days.. which is quite likely. so that's not going to work, sorry. I'm using the above for short intervals and it works in spite of the rollover (unless you enabled overflow checking, but that's another issue). Bye -- Luca ___ fpc-pascal maillist - fpc-pascal@lists.freepascal.org https://lists.freepascal.org/cgi-bin/mailman/listinfo/fpc-pascal
