c# – 如何在Windows中获取和设置系统卷教程
我想在键盘上单击使用单位和c#将操作系统音量设置为某个级别,例如我想将Windows音量(不是统一)设置为70:我该怎么做?
void Update()
{
if (Input.GetKeyDown(KeyCode.A))
{
//Set Windows Volume 70%
}
}
解决方法:
这需要一个插件.由于此问题适用于Windows,因此可以使用IAudioEndpointVolume
构建C++ plugin,然后使用C#调用它. This post有一个工作C示例,说明如何使用IAudioEndpointVolume更改卷,您可以使用它作为创建C插件的基本源.
我已经继续清理该代码然后转换为dll插件并将DLL放在Assets / Plugins文件夹中.您可以看到如何构建C插件here.
C代码:
#include "stdafx.h"
#include <windows.h>
#include <mmdeviceapi.h>
#include <endpointvolume.h>
#define DLLExport __declspec(dllexport)
extern "C"
{
enum class VolumeUnit {
Decibel,
Scalar
};
//Gets volume
DLLExport float GetSystemVolume(VolumeUnit vUnit) {
HRESULT hr;
// -------------------------
CoInitialize(NULL);
IMMDeviceEnumerator *deviceEnumerator = NULL;
hr = CoCreateInstance(__uuidof(MMDeviceEnumerator), NULL, CLSCTX_INPROC_SERVER, __uuidof(IMMDeviceEnumerator), (LPVOID *)&deviceEnumerator);
IMMDevice *defaultDevice = NULL;
hr = deviceEnumerator->GetDefaultAudioEndpoint(eRender, eConsole, &defaultDevice);
deviceEnumerator->Release();
deviceEnumerator = NULL;
IAudioEndpointVolume *endpointVolume = NULL;
hr = defaultDevice->Activate(__uuidof(IAudioEndpointVolume), CLSCTX_INPROC_SERVER, NULL, (LPVOID *)&endpointVolume);
defaultDevice->Release();
defaultDevice = NULL;
float currentVolume = 0;
if (vUnit == VolumeUnit::Decibel) {
//Current volume in dB
hr = endpointVolume->GetMasterVolumeLevel(¤tVolume);
}
else if (vUnit == VolumeUnit::Scalar) {
//Current volume as a scalar
hr = endpointVolume->GetMasterVolumeLevelScalar(¤tVolume);
}
endpointVolume->Release();
CoUninitialize();
return currentVolume;
}
//Sets volume
DLLExport void SetSystemVolume(double newVolume, VolumeUnit vUnit) {
HRESULT hr;
// -------------------------
CoInitialize(NULL);
IMMDeviceEnumerator *deviceEnumerator = NULL;
hr = CoCreateInstance(__uuidof(MMDeviceEnumerator), NULL, CLSCTX_INPROC_SERVER, __uuidof(IMMDeviceEnumerator), (LPVOID *)&deviceEnumerator);
IMMDevice *defaultDevice = NULL;
hr = deviceEnumerator->GetDefaultAudioEndpoint(eRender, eConsole, &defaultDevice);
deviceEnumerator->Release();
deviceEnumerator = NULL;
IAudioEndpointVolume *endpointVolume = NULL;
hr = defaultDevice->Activate(__uuidof(IAudioEndpointVolume), CLSCTX_INPROC_SERVER, NULL, (LPVOID *)&endpointVolume);
defaultDevice->Release();
defaultDevice = NULL;
if (vUnit == VolumeUnit::Decibel)
hr = endpointVolume->SetMasterVolumeLevel((float)newVolume, NULL);
else if (vUnit == VolumeUnit::Scalar)
hr = endpointVolume->SetMasterVolumeLevelScalar((float)newVolume, NULL);
endpointVolume->Release();
CoUninitialize();
}
}
C#代码:
using System.Runtime.InteropServices;
using UnityEngine;
public class VolumeManager : MonoBehaviour
{
//The Unit to use when getting and setting the volume
public enum VolumeUnit
{
//Perform volume action in decibels</param>
Decibel,
//Perform volume action in scalar
Scalar
}
/// <summary>
/// Gets the current volume
/// </summary>
/// <param name="vUnit">The unit to report the current volume in</param>
[DllImport("ChangeVolumeWindows")]
public static extern float GetSystemVolume(VolumeUnit vUnit);
/// <summary>
/// sets the current volume
/// </summary>
/// <param name="newVolume">The new volume to set</param>
/// <param name="vUnit">The unit to set the current volume in</param>
[DllImport("ChangeVolumeWindows")]
public static extern void SetSystemVolume(double newVolume, VolumeUnit vUnit);
// Use this for initialization
void Start()
{
//Get volume in Decibel
float volumeDecibel = GetSystemVolume(VolumeUnit.Decibel);
Debug.Log("Volume in Decibel: " + volumeDecibel);
//Get volume in Scalar
float volumeScalar = GetSystemVolume(VolumeUnit.Scalar);
Debug.Log("Volume in Scalar: " + volumeScalar);
//Set volume in Decibel
SetSystemVolume(-16f, VolumeUnit.Decibel);
//Set volume in Scalar
SetSystemVolume(0.70f, VolumeUnit.Scalar);
}
}
GetSystemVolume函数用于获取当前卷,SetSystemVolume用于设置它.这个问题适用于Windows,但您可以使用其他平台的API执行类似的操作.
按下A键时将其设置为70%:
void Update()
{
if (Input.GetKeyDown(KeyCode.A))
{
//Set Windows Volume 70%
SetSystemVolume(0.70f, VolumeUnit.Scalar);
}
}