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Asked: 2026-05-12T06:36:05+00:00

I have the following examples in c++, the first works as expected the second

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I have the following examples in c++, the first works as expected the second does not. I also note that the Windows System keyboard has the same problem. Anybody know why or a work around/better way of doing this?

keybd_event(VK_LWIN,0x5b,0 , 0); /* Windows Key Press */
keybd_event(VkKeyScan('l'), 0, 0, 0); /* L key Press */
keybd_event(VkKeyScan('l'), 0, KEYEVENTF_KEYUP,0); /* L key Release */
keybd_event(VK_LWIN,0x5b,KEYEVENTF_KEYUP,0); /* Windows Key Release */

This one fails:

keybd_event(VK_CONTROL,0x11,0 , 0); /* Control Key Press */
keybd_event(VK_MENU,0xb8, 0, 0); /* Alt Press */
keybd_event(VK_DELETE,0x2e, 0, 0); /* Del Press */

keybd_event(VK_DELETE,0x2e, KEYEVENTF_KEYUP,0); /* Del Release */
keybd_event(VK_MENU,0xb8, KEYEVENTF_KEYUP,0); /* Alt Release */
keybd_event(VK_CONTROL,0x11,KEYEVENTF_KEYUP,0); /* Control Key Release */
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1 Answer

  1. Editorial Team

    It’s probable that that particular combination is protected by the system. Windows has this feature where you can set so that it asks you to press Crtl+Alt+Del before you can enter your username and password to log in. I remember reading somewhere that that feature is to make sure it’s a real person entering the credentials and not a malicious program.

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