how to use GetPeakValue ?

[up3u]

Make sure to give enough information to help debugging your issue.
Here are some hints:

• current requirements (pip freeze)
• OS version Win7
• architecture
• Python version 3.6.5
• pycaw version
• project files
• exact stacktrace / accurate error message
• and so on

i want to get system or program's peak value immediately，but don't know how use it
only know little Information about: IID_IAudioMeterInformation and GetPeakValue.
these is Delphi(pascal) code, it work, but python ,how?
pascal code:
//================start=====================
unit uMain;

interface

uses
Winapi.Windows, Winapi.Messages, System.SysUtils, System.Variants, System.Classes, Vcl.Graphics,
Vcl.Controls, Vcl.Forms, Vcl.Dialogs, Winapi.ActiveX, System.Win.ComObj, MMSystem,
Vcl.ComCtrls, Vcl.ExtCtrls;

type
EDATAFLOW = TOleEnum;
EROLE = TOleEnum;

IMMDevice = interface(IUnknown)
['{D666063F-1587-4E43-81F1-B948E807363F}']
function Activate(const iid: TGUID; const dwClsCtx: UINT; const pActivationParams: PPropVariant; out ppInterface: IUnknown)
: HRESULT; stdcall;
end;

IMMDeviceCollection = interface(IUnknown)
['{0BD7A1BE-7A1A-44DB-8397-CC5392387B5E}']
end;

IMMDeviceEnumerator = interface(IUnknown)
['{A95664D2-9614-4F35-A746-DE8DB63617E6}']
function EnumAudioEndpoints(const dataFlow: EDATAFLOW; const dwStateMask: DWORD; out ppDevices: IMMDeviceCollection): HRESULT; stdcall;
function GetDefaultAudioEndpoint(const dataFlow: EDATAFLOW; const role: EROLE; out ppEndpoint: IMMDevice): HRESULT; stdcall;
end;

IAudioMeterInformation = interface(IUnknown)
['{C02216F6-8C67-4B5B-9D00-D008E73E0064}']
function GetPeakValue(out pfPeak: Single): HRESULT; stdcall;
function GetMeteringChannelCount(out pnChannelCount: UINT): HRESULT; stdcall;
function GetChannelsPeakValues(u32ChannelCount: UINT; out afPeakValues: pSingle): HRESULT; stdcall;
function QueryHardwareSupport(out pdwHardwareSupportMask: UINT): HRESULT; stdcall;
end;

TForm1 = class(TForm)
ProgressBar1: TProgressBar;
Timer1: TTimer;
procedure FormCreate(Sender: TObject);
procedure Timer1Timer(Sender: TObject);
private
{ Private declarations }
public
{ Public declarations }
end;

const
IID_IMMDeviceEnumerator: TGUID = '{A95664D2-9614-4F35-A746-DE8DB63617E6}';
CLASS_IMMDeviceEnumerator: TGUID = '{BCDE0395-E52F-467C-8E3D-C4579291692E}';
IID_IAudioMeterInformation: TGUID = '{C02216F6-8C67-4B5B-9D00-D008E73E0064}';
eRender = $00000000;
eConsole = $00000000;

var
Form1: TForm1;
peak: IAudioMeterInformation = nil;

implementation

{$R *.dfm}

{ TForm1 }

procedure TForm1.FormCreate(Sender: TObject);
var
device: IMMDevice;
deviceEnumerator: IMMDeviceEnumerator;
begin
Timer1.Enabled := False;
ProgressBar1.Max := 65535;
CoCreateInstance(CLASS_IMMDeviceEnumerator, nil, CLSCTX_ALL, IID_IMMDeviceEnumerator, deviceEnumerator);
deviceEnumerator.GetDefaultAudioEndpoint(eRender, eConsole, device);
device.Activate(IID_IAudioMeterInformation, CLSCTX_ALL, nil, IUnknown(peak));
Timer1.Enabled := true;
end;

procedure TForm1.Timer1Timer(Sender: TObject);
var
Temp: Single;
begin
peak.GetPeakValue(Temp);
ProgressBar1.position := Round(Temp * 65535);
end;

end.

//==============end ======================

thank you very much