Sleep() Question - previously about key input
Author
I want to run my program in the background and be able to have it perform a certain action when a certain key combination is pressed - regardless of which window is currently active. What can I use to accomplish this? Also, is it possible to create this in a console application, without the formal message loop of a Windows program?
[Edited by - v0dKA on March 13, 2006 6:53:51 PM]
Assuming you're using Windows, I believe you can use GetAsyncKeyState(key#) to get a key press regardless of wether or not the window has the focus.
Author
Thanks, I should have really thought of trying that =)
Instead of making a new thread, allow me to ask an unrelated question here.
I plan to have an infinite loop in my program to catch the aforementioned key combination. However, I don't want it to hog up all the resources. Currently, when I run it, it takes up around 50% of the CPU (I have hyperthreading on this machine). The program hardly needs that much processing power. I believe the solution to this would be to add a Sleep( 0 ) inside the infinite loop, no? I tried that, but the memory usage seems to be unaffected... Why not? Should I be concerned about having my little (less than 1MB) program take so much processing power?
Instead of making a new thread, allow me to ask an unrelated question here.
I plan to have an infinite loop in my program to catch the aforementioned key combination. However, I don't want it to hog up all the resources. Currently, when I run it, it takes up around 50% of the CPU (I have hyperthreading on this machine). The program hardly needs that much processing power. I believe the solution to this would be to add a Sleep( 0 ) inside the infinite loop, no? I tried that, but the memory usage seems to be unaffected... Why not? Should I be concerned about having my little (less than 1MB) program take so much processing power?
If you pass zero to Sleep the function gives up whatever time it's got left to another thread. If such a thread isn't present, Sleep(0) returns instantly...
Instead, use Sleep(1) or anything greater...
Instead, use Sleep(1) or anything greater...
Author
Another quick question for which an entire thread is probably not necessary:
How can I determine if a given HWND (call it hWnd) is currently active?
How can I determine if a given HWND (call it hWnd) is currently active?
If you want to check whether or not a certain window is on the top of the Z-Order, you can call GetForegroundWindow().
[Edited by - raz0r on March 13, 2006 7:27:34 PM]
[Edited by - raz0r on March 13, 2006 7:27:34 PM]
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