Calculate start and endtime of simultaneous key event using multithreading

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I need Calculate start and endtime of simultaneous key event using multithreading which i need to save perform the key events based on start and endtimes automatically.

suppose i perform keyDown of keyNo1 at start time 1 and endtime 8 and
Keyup of KeyNo2 at Starttime 2 and EndTime 10
KeyDown of KeyNo3 at Starttime 1 and Endtime 3 so on.

How to implement this in c++ and I need a sample code of this.

Posted 9-Feb-12 1:29am

chaiein

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Richard MacCutchan · Accepted Answer · 2012-02-09T03:14:00

Solution 1

Trap the key events and store the start time in a table using the keynumber as index. At the keyup event you can calculate (currentTime - startTime = elapsedTime). What is the difficulty?

Posted 9-Feb-12 3:14am

Richard MacCutchan

Comments

Espen Harlinn 9-Feb-12 9:17am

Good point :)

Sergey Alexandrovich Kryukov 9-Feb-12 17:52pm

Sure, a 5.
--SA

chaiein 9-Feb-12 23:16pm

How to use this in multi threading?

chaiein 9-Feb-12 23:18pm

difficulty now is how to implement it using multithreading concept.

chaiein 9-Feb-12 23:19pm

if multithreading is not used then can we get desired output using keynumber as the index of some array which is equal to size of the number of keys in keyboard?

chaiein 9-Feb-12 23:30pm

How to check whether the keydown is done on say key of alphabet 'a' or anyother character or number.

chaiein 9-Feb-12 23:49pm

So please tell me how to check whether that particular key is pressed.
if i press the same key more than once also all elapsed times should be stored vector array.

Richard MacCutchan 10-Feb-12 3:54am

Capture the WM_KEYDOWN and associated messages and work it from there.

Mohibur Rashid · Accepted Answer · 2012-02-09T03:15:00

Solution 2

Not enough information.
if your application dont have view may be you should start with keyboard hooking. You can get start time on wm_keydown window message and end time on wm_keyup.

Posted 9-Feb-12 3:15am

Mohibur Rashid

Comments

chaiein 9-Feb-12 23:51pm

So please tell me how to check whether that particular key is pressed.
if i press the same key more than once also all elapsed times should be stored vector array.

Mohibur Rashid 10-Feb-12 1:01am

please check
http://msdn.microsoft.com/en-us/library/windows/desktop/ms646280(v=vs.85).aspx
and
http://msdn.microsoft.com/en-us/library/windows/desktop/dd375731(v=vs.85).aspx

Still we dont know who would receive the key stroke.

chaiein 10-Feb-12 1:13am

keystroke is received by view that i have created a piano where each key of piano corresponds to a keys in keyboard.

chaiein 10-Feb-12 1:15am

thanks for the link :)

chaiein 10-Feb-12 1:20am

using the link you i have posted i can check whether that key is pressed or not. Instead can you tell me how can we get to know directly without checking true or false just something like getKeyNo()...Is there any Standard function?

Mohibur Rashid 10-Feb-12 8:56am

now i am confused, who is giving true or false? wparam is giving the key value directly