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並前往https://gamedev.stackexchange.com/questions/20446/does-vk-snapshot-not-send-a-wm-keydown-only-wm-keyup

Does VK_SNAPSHOT not send a WM_KEYDOWN; only ...

On my machine, every key sends a WM_KEYDOWN message except for SysReq / Print Screen key: which only seems to send WM_KEYUP. Is this actually the case?

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查詢 「WM_KEYUP」的人也找了：

  1. WM_KEYDOWN
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  2. WM_KEYUP
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  3. WM_CHAR
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  4. Sendmessage wm_keyup
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  5. SendInput
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  6. Wm_keyup example
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  7. WM_HOTKEY
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  8. WM_SYSKEYDOWN
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