winapi - C++ RegisterHotKey without overriding existing functionality -

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when register hot key in c++ (the prtscn key in case), noticed original functionality lost. key not capture image of screen more. there way register hot key without breaking existing bindings?

the problem context: trying create application our testing team automate task of taking screenshots. when user clicks prtscn / alt+prtscn keys, want run small application picks image on clipboard , pushes document. of application in java, had come c++ registering hot key.

thanks help!!

this code used register hot key:

registerhotkey(null, 1, mod_alt | mod_norepeat, vk_snapshot); registerhotkey(null, 2, mod_norepeat, vk_snapshot);  while (getmessage(&msg, null, 0, 0) != 0) {     if (msg.message == wm_hotkey)     {         winexec(" java application ", sw_shownormal);     } }

i don't think there's documented way trigger os's print screen functionality programmatically. have few ideas try:

  1. implement copy-to-clipboard functionality yourself, or
  2. once hotkey has been triggered, temporarily unregister hotkey , use sendinput() resend key press (this admittedly bit kludgy), or
  3. drop hotkey method altogether , instead register clipboard viewer using setclipboardviewer() etc.

to me last idea seems best - you'll notified when clipboard contents change , it's easy see if format on clipboard image or not.


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