音量调节助手(转)

unit UnitVolumeWin7;

interface

uses messages, Windows, Forms;

/// <summary>
/// 增大音量
/// </summary>
procedure VolumeUp;
/// <summary>
/// 减小音量
/// </summary>
procedure VolumeDown;
/// <summary>
/// 切换静音
/// </summary>
procedure VolumeMute;

implementation

procedure VolumeUp;
begin
  SendMessage(Application.Handle, WM_APPCOMMAND, $30292, APPCOMMAND_VOLUME_UP * $10000);
end;

procedure VolumeDown;
begin
  SendMessage(Application.Handle, WM_APPCOMMAND, $30292, APPCOMMAND_VOLUME_DOWN * $10000);
end;

procedure VolumeMute;
begin
  SendMessage(Application.Handle, WM_APPCOMMAND, $200EB0, APPCOMMAND_VOLUME_MUTE * $10000);
end;

end.