KeypressOSD，AHK版的按键显示器，非常适合录屏、直播使用，来自网络收集

; KeypressOSD.ahk
;--------------------------------------------------------------------------------------------------------------------------
; ChangeLog : v2.22 (2017-02-25) - Now pressing same combination keys continuously more than 2 times,
;                                  for example press Ctrl+V 3 times, will displayed as "Ctrl + v (3)"
;             v2.21 (2017-02-24) - Fixed LWin/RWin not poping up start menu
;             v2.20 (2017-02-24) - Added displaying continuous-pressed combination keys.
;                                  e.g.: With CTRL key held down, pressing K and U continuously will shown as "Ctrl + k, u"
;             v2.10 (2017-01-22) - Added ShowStickyModKeyCount option
;             v2.09 (2017-01-22) - Added ShowModifierKeyCount option
;             v2.08 (2017-01-19) - Fixed a bug
;             v2.07 (2017-01-19) - Added ShowSingleModifierKey option (default is True)
;             v2.06 (2016-11-23) - Added more keys. Thanks to SashaChernykh.
;             v2.05 (2016-10-01) - Fixed not detecting "Ctrl + ScrollLock/NumLock/Pause". Thanks to lexikos.
;             v2.04 (2016-10-01) - Added NumpadDot and AppsKey
;             v2.03 (2016-09-17) - Added displaying "Double-Click" of the left mouse button.
;             v2.02 (2016-09-16) - Added displaying mouse button, and 3 settings (ShowMouseButton, FontSize, GuiHeight)
;             v2.01 (2016-09-11) - Display non english keyboard layout characters when combine with modifer keys.
;             v2.00 (2016-09-01) - Removed the "Fade out" effect because of its buggy.
;                                - Added support for non english keyboard layout.
;                                - Added GuiPosition setting.
;             v1.00 (2013-10-11) - First release.
;--------------------------------------------------------------------------------------------------------------------------

#SingleInstance force
#NoEnv
SetBatchLines, -1
ListLines, Off

; Settings
    global TransN                := 200      ; 0~255
    global ShowSingleKey         := True
    global ShowMouseButton       := True
    global ShowSingleModifierKey := True
    global ShowModifierKeyCount  := true
    global ShowStickyModKeyCount := false
    global DisplayTime           := 2000     ; In milliseconds
    global GuiPosition           := "Bottom" ; Top or Bottom
    global FontSize              := 50
    global GuiHeight             := 115

CreateGUI()
CreateHotkey()
return

OnKeyPressed:
    try {
        key := GetKeyStr()
        ShowHotkey(key)
        SetTimer, HideGUI, % -1 * DisplayTime
    }
return

OnKeyUp:
return

_OnKeyUp:
    tickcount_start := A_TickCount
return

; ===================================================================================
CreateGUI() {
    global

Gui, +AlwaysOnTop -Caption +Owner +LastFound +E0x20
Gui, Margin, 0, 0
Gui, Color, Black
Gui, Font, cWhite s%FontSize% bold, Arial
Gui, Add, Text, vHotkeyText Center y20

WinSet, Transparent, %TransN%

}
CreateHotkey() {

    Loop, 95

    {

        k := Chr(A_Index + 31)

        k := (k = " ") ? "Space" : k
    Hotkey, % "~*" k, OnKeyPressed
    Hotkey, % "~*" k " Up", _OnKeyUp
}

Loop, 24 ; F1-F24
{
    Hotkey, % "~*F" A_Index, OnKeyPressed
    Hotkey, % "~*F" A_Index " Up", _OnKeyUp
}

Loop, 10 ; Numpad0 - Numpad9
{
    Hotkey, % "~*Numpad" A_Index - 1, OnKeyPressed
    Hotkey, % "~*Numpad" A_Index - 1 " Up", _OnKeyUp
}

Otherkeys := "WheelDown|WheelUp|WheelLeft|WheelRight|XButton1|XButton2|Browser_Forward|Browser_Back|Browser_Refresh|Browser_Stop|Browser_Search|Browser_Favorites|Browser_Home|Volume_Mute|Volume_Down|Volume_Up|Media_Next|Media_Prev|Media_Stop|Media_Play_Pause|Launch_Mail|Launch_Media|Launch_App1|Launch_App2|Help|Sleep|PrintScreen|CtrlBreak|Break|AppsKey|NumpadDot|NumpadDiv|NumpadMult|NumpadAdd|NumpadSub|NumpadEnter|Tab|Enter|Esc|BackSpace"
           . "|Del|Insert|Home|End|PgUp|PgDn|Up|Down|Left|Right|ScrollLock|CapsLock|NumLock|Pause|sc145|sc146|sc046|sc123"
Loop, parse, Otherkeys, |
{
    Hotkey, % "~*" A_LoopField, OnKeyPressed
    Hotkey, % "~*" A_LoopField " Up", _OnKeyUp
}

If ShowMouseButton {
    Loop, Parse, % "LButton|MButton|RButton", |
        Hotkey, % "~*" A_LoopField, OnKeyPressed
}

for i, mod in ["Ctrl", "Shift", "Alt"] {
    Hotkey, % "~*" mod, OnKeyPressed
    Hotkey, % "~*" mod " Up", OnKeyUp
}
for i, mod in ["LWin", "RWin"]
    Hotkey, % "~*" mod, OnKeyPressed

}
ShowHotkey(HotkeyStr) {

    WinGetPos, ActWin_X, ActWin_Y, ActWin_W, ActWin_H, A

    if !ActWin_W

        throw
text_w := (ActWin_W > A_ScreenWidth) ? A_ScreenWidth : ActWin_W
GuiControl,     , HotkeyText, %HotkeyStr%
GuiControl, Move, HotkeyText, w%text_w% Center

if (GuiPosition = "Top")
    gui_y := ActWin_Y
else
    gui_y := (ActWin_Y+ActWin_H) - 115 - 50

Gui, Show, NoActivate x%ActWin_X% y%gui_y% h%GuiHeight% w%text_w%

}
GetKeyStr() {

    static modifiers := ["Ctrl", "Shift", "Alt", "LWin", "RWin"]

    static repeatCount := 1
for i, mod in modifiers {
    if GetKeyState(mod)
        prefix .= mod " + "
}

if (!prefix && !ShowSingleKey)
    throw

key := SubStr(A_ThisHotkey, 3)

if (key ~= "i)^(Ctrl|Shift|Alt|LWin|RWin)$") {
    if !ShowSingleModifierKey {
        throw
    }
    key := ""
    prefix := RTrim(prefix, "+ ")

    if ShowModifierKeyCount {
        if !InStr(prefix, "+") && IsDoubleClickEx() {
            if (A_ThisHotKey != A_PriorHotKey) || ShowStickyModKeyCount {
                if (++repeatCount > 1) {
                    prefix .= " ( * " repeatCount " )"
                }
            } else {
                repeatCount := 0
            }
        } else {
            repeatCount := 1
        }
    }
} else {
    if ( StrLen(key) = 1 ) {
        key := GetKeyChar(key, "A")
    } else if ( SubStr(key, 1, 2) = "sc" ) {
        key := SpecialSC(key)
    } else if (key = "LButton") && IsDoubleClick() {
        key := "Double-Click"
    }
    _key := (key = "Double-Click") ? "LButton" : key

    static pre_prefix, pre_key, keyCount := 1
    global tickcount_start
    if (prefix && pre_prefix) && (A_TickCount-tickcount_start < 300) {
        if (prefix != pre_prefix) {
            result := pre_prefix pre_key ", " prefix key
        } else {
            keyCount := (key=pre_key) ? (keyCount+1) : 1
            key := (keyCount>2) ? (key " (" keyCount ")") : (pre_key ", " key)
        }
    } else {
        keyCount := 1
    }

    pre_prefix := prefix
    pre_key := _key

    repeatCount := 1
}
return result ? result : prefix . key

}
SpecialSC(sc) {

    static k := {sc046: "ScrollLock", sc145: "NumLock", sc146: "Pause", sc123: "Genius LuxeMate Scroll"}

    return k[sc]

}
; by Lexikos -- https://autohotkey.com/board/topic/110808-getkeyname-for-other-languages/#entry682236

GetKeyChar(Key, WinTitle:=0) {

    thread := WinTitle=0 ? 0

        : DllCall("GetWindowThreadProcessId", "ptr", WinExist(WinTitle), "ptr", 0)

    hkl := DllCall("GetKeyboardLayout", "uint", thread, "ptr")

    vk := GetKeyVK(Key), sc := GetKeySC(Key)

    VarSetCapacity(state, 256, 0)

    VarSetCapacity(char, 4, 0)

    n := DllCall("ToUnicodeEx", "uint", vk, "uint", sc

        , "ptr", &state, "ptr", &char, "int", 2, "uint", 0, "ptr", hkl)

    return StrGet(&char, n, "utf-16")

}
IsDoubleClick(MSec = 300) {

    Return (A_ThisHotKey = A_PriorHotKey) && (A_TimeSincePriorHotkey < MSec)

}
IsDoubleClickEx(MSec = 300) {

    preHotkey := RegExReplace(A_PriorHotkey, "i) Up$")

    Return (A_ThisHotKey = preHotkey) && (A_TimeSincePriorHotkey < MSec)

}
HideGUI() {

    Gui, Hide

}