BorlandTalk.com Borland discussion newsgroups   Archives   FAQ   Search   Memberlist   Usergroups   Register   Profile   Log in to check your private messages   Log in  Timer          BorlandTalk.com Forum Index -> C++ Builder (Native API) View previous topic :: View next topic   Author Message Hans Jönsson Guest Posted: Mon Feb 27, 2006 8:03 pm    Post subject: Timer Is there in bcb a good way of timing input to 1/10 of a second in a reliable way. I remember from Petzold that Windows' doesn't offer a good way to do it. greetins hans Back to top Remy Lebeau (TeamB) Guest Posted: Mon Feb 27, 2006 10:03 pm    Post subject: Re: Timer "Hans Jönsson" <042140773 (AT) telia (DOT) com> wrote in message news:44034cb3 (AT) newsgroups (DOT) borland.com... Quote: Is there in bcb a good way of timing input to 1/10 of a second in a reliable way. What exactly are you trying to accomplish? Gambit Back to top Hans Jönsson Guest Posted: Tue Feb 28, 2006 5:03 pm    Post subject: Re: Timer I want to present a word on the screen and measure the time it takes for somebody to read the word. Start a timer when the word is presented, read the time when the person moves on to next word (by pressing something, never mind unreliability in this device - I know how to handle that ). Accuracy of 1/10 of a second is enough. If it were 1/100 or even higher I wouldn't complain but it isn't necessary. "Remy Lebeau (TeamB)" <no.spam (AT) no (DOT) spam.com> skrev i meddelandet news:44036c80$1 (AT) newsgroups (DOT) borland.com... Quote: "Hans Jönsson" <042140773 (AT) telia (DOT) com> wrote in message news:44034cb3 (AT) newsgroups (DOT) borland.com... Is there in bcb a good way of timing input to 1/10 of a second in a reliable way. What exactly are you trying to accomplish? Gambit Back to top Remy Lebeau (TeamB) Guest Posted: Tue Feb 28, 2006 8:03 pm    Post subject: Re: Timer "Hans Jönsson" <042140773 (AT) telia (DOT) com> wrote in message news:44047cc2 (AT) newsgroups (DOT) borland.com... Quote: Start a timer when the word is presented, read the time when the person moves on to next word You don't need a timer for that. Simple call GetTickCount() when the word is shown, and again when the word is finished. The difference between the two values will be the elapsed time, in milliseconds. Quote: by pressing something Pressing a button (or other control) is an action that relies on messages being placed in, and retreived from, the message queue. So no matter how fast your timer is, the overall calculation for the reading speed will be slowed down by that. If your main thread is delayed in processing new messages, your click actions will be delayed, and your calculation will be inaccurate. About the only way I can think of to get real-time results at the resolution you are asking for is to use a global keyboard and/or mouse hook via the SetWindowsHookEx() function in a DLL. When the user wants to move on to the next word, they simply press the keyboard, or move the mouse, or click the mouse button (but not on anything specific). The hook(s) can track the hardware notifications so it can react faster than waiting for the message queue. Gambit Back to top Hans Jönsson Guest Posted: Tue Feb 28, 2006 8:03 pm    Post subject: Re: Timer I am really grateful for this solution. hans "Remy Lebeau (TeamB)" <no.spam (AT) no (DOT) spam.com> skrev i meddelandet news:44049c3f$1 (AT) newsgroups (DOT) borland.com... Quote: "Hans Jönsson" <042140773 (AT) telia (DOT) com> wrote in message news:44047cc2 (AT) newsgroups (DOT) borland.com... Start a timer when the word is presented, read the time when the person moves on to next word You don't need a timer for that. Simple call GetTickCount() when the word is shown, and again when the word is finished. The difference between the two values will be the elapsed time, in milliseconds. by pressing something Pressing a button (or other control) is an action that relies on messages being placed in, and retreived from, the message queue. So no matter how fast your timer is, the overall calculation for the reading speed will be slowed down by that. If your main thread is delayed in processing new messages, your click actions will be delayed, and your calculation will be inaccurate. About the only way I can think of to get real-time results at the resolution you are asking for is to use a global keyboard and/or mouse hook via the SetWindowsHookEx() function in a DLL. When the user wants to move on to the next word, they simply press the keyboard, or move the mouse, or click the mouse button (but not on anything specific). The hook(s) can track the hardware notifications so it can react faster than waiting for the message queue. 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