如何触发Windows音量显示？

Question

当在 Windows 上按下增加音量的标准键盘键时，左上角会出现一个小窗口，显示音量以及可能有关播放媒体的信息。我正在寻找一种在不更改音量状态的情况下触发窗口的方法，最好以一种易于与 Autohotkey 集成的方式。

Answer 1

与音量控制键一起使用时所需的行为可以通过存储当前音量、发送媒体键按下、然后将音量更新为存储值 +/- 1（或 +0，如果只是寻求显示 OSD）来获得。

Volume_Down当音量 <=3 时进行模仿时会出现边缘情况。发送的Volume_Down按键会触发静音，但这可以通过手动将静音设置为关闭来解决，或者将音量预先设置为 4，这样可以防止四舍五入到 0。选择哪种方法取决于您是否喜欢当音量从 <=3 值降低时，可能会发出短暂的响亮声音（预设为 4）或短暂静音（之后禁用静音）。

以下代码位于 AHK v2 中。

; Prefix with '$' so as to prevent self triggering, since internally sending Volume_Up
$Volume_Up::{
    ; Get the current volume. SoundGetVolume returns a float which often needs rounding
    volume:=Round(SoundGetVolume())
    ; Send the Volume_Up key, so the media display is triggered
    Send "{Volume_Up}"
    ; Indiscriminately set the volume manually to volume+1
    SoundSetVolume(volume+1)
}

; Much the same as above, yet when sending Volume_Down at volumes <=3 the volume
;   is rounded down to 0 which triggers mute. The volume is then set properly,
;   yet remains muted. In order to not hear a cut in the audio, you need to set
;   the volume to 4 when (1<volume<=3) so that the Volume_Down doesn't round it
;   down to 0, or disable the mute afterwards (if volume > 1). This causes a
;   brief volume spike or mute blip, respectively. Currently the volume spike option
;   is uncommented.
$Volume_Down::{
    volume:=Round(SoundGetVolume())

    ; Bumping the volume before sending the Volume_Down to prevent mute blip (if needed)
    if(1 < volume and volume <= 3){
        SoundSetVolume(4)
    }

    Send "{Volume_Down}"
    SoundSetVolume(volume-1)

    ; ; Disable accidental triggering of mute when volume >= 3 after sending Volume_Down
    ; if(volume > 1) {
    ;   SoundSetMute(0)
    ; }
}

当问题询问时触发 OSD 可以进行以下操作。按音量键然后快速重置音量将显示它，但如果当前处于静音状态，则需要考虑以防止出现声音。使用音量键是因为双重切换Volume_Mute会导致声音输出出现间隙。

; Trigger the on screen display of the volume bar by hitting Volume_Up and
;   then quickly resetting the volume. If muted and send Volume_Up, we will
;   hear audio at original volume for a brief second. To prevent this, we
;   can set the volume to 0 and send Volume_Down instead.
^PgUp::{
    volume:=Round(SoundGetVolume())
    muted:=SoundGetMute()

    ; Trigger the display with a volume key (might briefly bump the volume if unmuted)
    if (muted or volume == 0) {
        SoundSetVolume(0)
        Send "{Volume_Down}"
    } else {
        Send "{Volume_Up}"
    }

    ; Reset to the original volume and mute status
    SoundSetMute(muted)
    SoundSetVolume(volume)
}

所有相同的代码，但未注释：

$Volume_Up::{
    volume:=Round(SoundGetVolume())
    Send "{Volume_Up}"
    SoundSetVolume(volume+1)
}

$Volume_Down::{
    volume:=Round(SoundGetVolume())
    if(1 < volume and volume <= 3){
        SoundSetVolume(4)
    }
    Send "{Volume_Down}"
    SoundSetVolume(volume-1)
}

^PgUp::{
    volume:=Round(SoundGetVolume())
    muted:=SoundGetMute()
    if (muted or volume == 0) {
        SoundSetVolume(0)
        Send "{Volume_Down}"
    } else {
        Send "{Volume_Up}"
    }
    SoundSetMute(muted)
    SoundSetVolume(volume)
}