windows代码设置默认⾳频输出设备1.windows⾳频输⼊设备与输出设备
1）windows中输⼊设备是指麦克风，如下图：
2）windows中⾳频输出设备是指扬声器，如下图：
2.有些时候，windows⾳频播放设备可能有多个，那么如何通过代码设置默认的⾳频输出设备呢？
法1：利⽤wave系列函数
新建windows控制台程序，加⼊如下代码：
1#include "stdafx.h"
2#include <windows.h>
3#include <mmsystem.h>
4#include <iostream>
5using namespace std;
6#pragma comment(lib, "Winmm.lib")
7
8#ifdef UNICODE
9#define tcout wcout
10#el
11#define tcout cout
12#endif
13
炸虾球的做法
14int _tmain(int argc, _TCHAR* argv[])
15{
16 int nSoundCardCount = waveOutGetNumDevs();
17
18 for (int i = 0; i < nSoundCardCount; i++)
19 {
20 WAVEOUTCAPS woc;
21 waveOutGetDevCaps(i, &woc, sizeof(woc));小锦鲤
22
23 tcout << woc.szPname << endl;
24 }
25
26 //waveOutMessage((HWAVEOUT)WAVE_MAPPER,WAVE_MAPPED_DEFAULT_COMMUNICATION_DEVICE,1,0);
27
28 system("pau");
29 return 0;
30}
这⾥可以枚举出所有的播放设备，但是要设置默认的播放设备，暂时不知道怎么弄，⽹上说⽤waveOutMessage发送⼀个消息，但是那个消息windows中找不到，⽽且还是winCE的，所以只好放弃
法2：利⽤微软未公布的api实现
这⾥要⽤到PolicyConfig.h和SetDefaultAudioPlaybackDevice,⾃⾏添加.h⽂件和接⼝即可
1）PolicyConfig.h内容
1// ----------------------------------------------------------------------------
2// PolicyConfig.h
3// Undocumented COM-interface IPolicyConfig.
4// U for t default audio render endpoint
5// @author EreTIk
6// ----------------------------------------------------------------------------
1000澳元7
8
9#pragma once
10
11
12interface DECLSPEC_UUID("f8679f50-850a-41cf-9c72-430f290290c8")
13IPolicyConfig;
14class DECLSPEC_UUID("870af99c-171d-4f9e-af0d-e63df40c2bc9")
15CPolicyConfigClient;
16// ----------------------------------------------------------------------------
17// class CPolicyConfigClient
18// {870af99c-171d-4f9e-af0d-e63df40c2bc9}
19//
20// interface IPolicyConfig
21// {f8679f50-850a-41cf-9c72-430f290290c8}
22//
23// Query interface:
24// CComPtr<IPolicyConfig> PolicyConfig;
25// PolicyConfig.CoCreateInstance(__uuidof(CPolicyConfigClient)); 26//
27// @compatible: Windows 7 and Later
28// ----------------------------------------------------------------------------
29interface IPolicyConfig : public IUnknown
30{
31public:
32
33 virtual HRESULT GetMixFormat(
34 PCWSTR,
35 WAVEFORMATEX **
36 );
37
38 virtual HRESULT STDMETHODCALLTYPE GetDeviceFormat(
39 PCWSTR,
40 INT,
41 WAVEFORMATEX **
42 );
43
44 virtual HRESULT STDMETHODCALLTYPE RetDeviceFormat(
45 PCWSTR
46 );
47
48 virtual HRESULT STDMETHODCALLTYPE SetDeviceFormat(
49 PCWSTR,
50 WAVEFORMATEX *,
51 WAVEFORMATEX *
52 );
53
54 virtual HRESULT STDMETHODCALLTYPE GetProcessingPeriod(
55 PCWSTR,
发明故事56 INT,
57 PINT64,
58 PINT64
59 );
60
61 virtual HRESULT STDMETHODCALLTYPE SetProcessingPeriod(
62 PCWSTR,
63 PINT64
64 );
65
66 virtual HRESULT STDMETHODCALLTYPE GetShareMode(
67 PCWSTR,
68 struct DeviceShareMode *
69 );
70
71 virtual HRESULT STDMETHODCALLTYPE SetShareMode(
72 PCWSTR,
73 struct DeviceShareMode *
74 );
75
76 virtual HRESULT STDMETHODCALLTYPE GetPropertyValue(
77 PCWSTR,
78 const PROPERTYKEY &,
79 PROPVARIANT *
80 );
81
82 virtual HRESULT STDMETHODCALLTYPE SetPropertyValue(
83 PCWSTR,
84 const PROPERTYKEY &,
85 PROPVARIANT *
86 );
87
88 virtual HRESULT STDMETHODCALLTYPE SetDefaultEndpoint(
89 __in PCWSTR wszDeviceId,
90 __in ERole eRole
91 );
92
93 virtual HRESULT STDMETHODCALLTYPE SetEndpointVisibility(
94 PCWSTR,
95 INT
96 );
97};
98
99interface DECLSPEC_UUID("568b9108-44bf-40b4-9006-86afe5b5a620") 100IPolicyConfigVista;
101class DECLSPEC_UUID("294935CE-F637-4E7C-A41B-AB255460B862") 102CPolicyConfigVistaClient;
103// ----------------------------------------------------------------------------
104// class CPolicyConfigVistaClient
105// {294935CE-F637-4E7C-A41B-AB255460B862}
106//
107// interface IPolicyConfigVista
108// {568b9108-44bf-40b4-9006-86afe5b5a620}
109//
110// Query interface:
111// CComPtr<IPolicyConfigVista> PolicyConfig;
112// PolicyConfig.CoCreateInstance(__uuidof(CPolicyConfigVistaClient)); 113//
114// @compatible: Windows Vista and Later
115// ----------------------------------------------------------------------------
116interface IPolicyConfigVista : public IUnknown
117{
118public:
119
120 virtual HRESULT GetMixFormat(
121 PCWSTR,
西装怎么洗
122 WAVEFORMATEX **
123 ); // not available on Windows 7, u method from IPolicyConfig
124
125 virtual HRESULT STDMETHODCALLTYPE GetDeviceFormat(
126 PCWSTR,
127 INT,
128 WAVEFORMATEX **
129 );
130
131 virtual HRESULT STDMETHODCALLTYPE SetDeviceFormat(
132 PCWSTR,
133 WAVEFORMATEX *,
134 WAVEFORMATEX *
135 );
136
137 virtual HRESULT STDMETHODCALLTYPE GetProcessingPeriod( 138 PCWSTR,
139 INT,
140 PINT64,
141 PINT64
142 ); // not available on Windows 7, u method from IPolicyConfig
143
144 virtual HRESULT STDMETHODCALLTYPE SetProcessingPeriod(
145 PCWSTR,
146 PINT64
147 ); // not available on Windows 7, u method from IPolicyConfig
148
149 virtual HRESULT STDMETHODCALLTYPE GetShareMode(
150 PCWSTR,
151 struct DeviceShareMode *
152 ); // not available on Windows 7, u method from IPolicyConfig
153
查流量怎么查154 virtual HRESULT STDMETHODCALLTYPE SetShareMode(
155 PCWSTR,
156 struct DeviceShareMode *
reason模型
157 ); // not available on Windows 7, u method from IPolicyConfig
158
159 virtual HRESULT STDMETHODCALLTYPE GetPropertyValue(
160 PCWSTR,
161 const PROPERTYKEY &,
162 PROPVARIANT *
163 );
164
165 virtual HRESULT STDMETHODCALLTYPE SetPropertyValue(
166 PCWSTR,
167 const PROPERTYKEY &,
168 PROPVARIANT *
169 );
170
171 virtual HRESULT STDMETHODCALLTYPE SetDefaultEndpoint(
172 __in PCWSTR wszDeviceId,
173 __in ERole eRole
174 );
175
176 virtual HRESULT STDMETHODCALLTYPE SetEndpointVisibility(
177 PCWSTR,
178 INT
周记四年级
179 ); // not available on Windows 7, u method from IPolicyConfig
180};
2）添加头⽂件和接⼝
1#include "Mmdeviceapi.h"
2#include "PolicyConfig.h"
3#include "Propidl.h"
4#include "Functiondiscoverykeys_devpkey.h"
1HRESULT SetDefaultAudioPlaybackDevice( LPCWSTR devID )
2{
3 IPolicyConfigVista *pPolicyConfig;
4 ERole rerved = eConsole;
5
6 HRESULT hr = CoCreateInstance(__uuidof(CPolicyConfigVistaClient),
7 NULL, CLSCTX_ALL, __uuidof(IPolicyConfigVista), (LPVOID *)&pPolicyConfig);
8 if (SUCCEEDED(hr))
9 {
10 hr = pPolicyConfig->SetDefaultEndpoint(devID, rerved);
11 pPolicyConfig->Relea();
12 }
13 return hr;
14}
3）利⽤上⾯的接⼝⾃⼰写函数来设置默认输出设备
这⾥是⾃⼰添加的设置默认输出设备函数（MFC⼯程）
1//设置默认⾳频播放设备
