delphi 控制音量 静音的类

Posted 2021-01-17 westsoft

unit ttSound;

interface

uses winapi.windows, winapi.Messages;

type
SimpleSoundControl = class
class procedure Mute(); static;
class procedure VolumeUp(); static;
class procedure VolumeDown(); static;
end;

implementation

{ SimpleSoundControl }

class procedure SimpleSoundControl.Mute;
begin
keybd_event(VK_VOLUME_MUTE, MapVirtualKey(VK_VOLUME_MUTE, 0), KEYEVENTF_EXTENDEDKEY, 0);
keybd_event(VK_VOLUME_MUTE, MapVirtualKey(VK_VOLUME_MUTE, 0), KEYEVENTF_EXTENDEDKEY or KEYEVENTF_KEYUP, 0);
end;

class procedure SimpleSoundControl.VolumeDown;
begin
keybd_event(VK_VOLUME_DOWN, MapVirtualKey(VK_VOLUME_DOWN, 0), KEYEVENTF_EXTENDEDKEY, 0);
keybd_event(VK_VOLUME_DOWN, MapVirtualKey(VK_VOLUME_DOWN, 0), KEYEVENTF_EXTENDEDKEY or KEYEVENTF_KEYUP, 0);
end;

class procedure SimpleSoundControl.VolumeUp;
begin
keybd_event(VK_VOLUME_UP, MapVirtualKey(VK_VOLUME_UP, 0), KEYEVENTF_EXTENDEDKEY, 0);
keybd_event(VK_VOLUME_UP, MapVirtualKey(VK_VOLUME_UP, 0), KEYEVENTF_EXTENDEDKEY or KEYEVENTF_KEYUP, 0);
end;

end.