c++ - Better Way to programmaticly detect a key press? -

c++ - Better Way to programmaticly detect a key press? -

i'm using this:

while (1) { if (getasynckeystate(vk_f1)) { //do } }

to observe if user presses key, in case f1. i've found eats cpu usage quite bit, question is, there improve way observe key presses?

the improve way of doing using wndproc(). utilize standard wm_keydown/wm_keyup messages handle keyboard input. here example:

lresult callback wndproc( hwnd hwnd, uint umsg, wparam wparam, lparam lparam ) { switch ( umsg ) { case wm_close: destroywindow(hwnd); break; case wm_destroy: postquitmessage(0); break; case wm_keydown: if ( wparam == vk_f1 ) { // here homecoming 0l; } break; } homecoming defwindowproc( hwnd, umsg, wparam, lparam ); } int winapi winmain(hinstance hinstance, hinstance hprevinstance, lpstr lpcmdline, int ncmdshow) { wndclassex wc; hwnd hwnd; msg msg; //step 1: registering window class wc.cbsize = sizeof(wndclassex); wc.style = 0; wc.lpfnwndproc = wndproc; // lots of other attrs ... wc.lpszclassname = g_szclassname; wc.hiconsm = loadicon(null, idi_application); if(!registerclassex(&wc)) homecoming 0; // step 2: creating window hwnd = createwindowex( ... g_szclassname, ...); if(hwnd == null) homecoming 0; showwindow(hwnd, ncmdshow); updatewindow(hwnd); // step 3: message loop while(getmessage(&msg, null, 0, 0) > 0) { translatemessage(&msg); dispatchmessage(&msg); } homecoming msg.wparam; }

c++ windows keypress