如何在SendInput中使用扩展的扫描代码

Question

To emulate some keys I have to send there scancodes, to do this I use SendInput() function from WinAPI and it's work fine in most cases, but how to use it for sending scancodes for such keys as "Pause"? This key generates 6 byte scancode (E1 1D 45 E1 9D C5), as scancode in KEYBDINPUT structer has WORD type, ie allows to use scancodes up to 2 bytes only. I tried 1D45 scancode and 9DC5 with KEYEVENTF_EXTENDEDKEY flag, suggesting that it apply E0\\E1 code depending on content. I also tried to send sequences of six 1 byte commands. But all that doesn't work.

Answer 1

I found the answer. You have to send two inputs into your array for SendInput. The first entry will be 0xE0, and the second-entry will be your scancode.

I actually found the solution here, embedded in the graphic: https://docs.microsoft.com/en-us/previous-versions/visualstudio/visual-studio-6.0/aa299374(v=vs.60)

See code. It's C#, but you'll get the idea.

        inputs = new[]
        {
            new WinAPI.INPUT
            {
                type = WinAPI.INPUT_KEYBOARD,

                u = new WinAPI.InputUnion
                {
                    ki = new WinAPI.KEYBDINPUT()
                    {
                        wScan = (ushort) 0xe0,
                        wVk = (ushort) 0,
                        dwFlags = (ushort) dwFlags,
                        dwExtraInfo = WinAPI.GetMessageExtraInfo()
                    }
                }
            },
            new WinAPI.INPUT
            {
                type = WinAPI.INPUT_KEYBOARD,

                u = new WinAPI.InputUnion
                {
                    ki = new WinAPI.KEYBDINPUT()
                    {
                        wScan = (ushort) tscancode,
                        wVk = (ushort) tvk,
                        dwFlags = (ushort) dwFlags,
                        dwExtraInfo = WinAPI.GetMessageExtraInfo()
                    }
                }
            }
        };