c++ - Detect if mouse button is down -

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i new c++ , trying activate line of code only when left mouse button held down. in example, code works seems toggles it. when click, spams h key then, when click again, stops.

currently have code:

if ((getkeystate(vk_lbutton))) {     keybd_event(vkkeyscan('h'),0,0,0);     sleep ( 30 ); }

edit:

i have inside function: 

int winapi winmain ( hinstance hinst, hinstance p, lpstr cmd, int nshowcmd );

use determine if button pressed.

if((getkeystate(vk_lbutton) & 0x100) != 0)

http://vcpptips.wordpress.com/tag/vk_lbutton/


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