我想在按下键盘时使用Unity和C#将操作系统音量设置为特定级别,例如我想将Windows音量(而不是Unity)设置为70:我该怎么做?
void Update()
{
if (Input.GetKeyDown(KeyCode.A))
{
//Set Windows Volume 70%
}
}
我想在按下键盘时使用Unity和C#将操作系统音量设置为特定级别,例如我想将Windows音量(而不是Unity)设置为70:我该怎么做?
void Update()
{
if (Input.GetKeyDown(KeyCode.A))
{
//Set Windows Volume 70%
}
}
IAudioEndpointVolume
来构建一个C++插件,然后从C#中调用它。这篇文章有一个使用 IAudioEndpointVolume
改变音量的工作示例,您可以将其用作创建C++插件的基础源代码。
我已经整理了那段代码并将其转换为了一个dll插件,并将DLL放置在Assets / Plugins文件夹中。 您可以在此处查看如何构建C++插件。
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
函数用于获取当前音量,而SetSystemVolume
函数则用于设置音量。这个问题适用于Windows平台,但你也可以使用其他平台的API来完成类似的操作。
要在按下A键时将其设置为70%
,请执行以下操作:
void Update()
{
if (Input.GetKeyDown(KeyCode.A))
{
//Set Windows Volume 70%
SetSystemVolume(0.70f, VolumeUnit.Scalar);
}
}
据我所知,你无法这样做。这样做没有任何好处,你在任何游戏/应用程序中见过这样做吗?
您可以使用滑块更改Unity应用程序的主音量,并以同样的方式管理其他声音效果。
http://docs.unity3d.com/ScriptReference/AudioListener.html
http://docs.unity3d.com/ScriptReference/AudioListener-volume.html
例子
public class AudioControl: MonoBehaviour {
void SetVolume(Slider slider) {
AudioListener.volume = slider.Value;
// probably save this value to a playerpref so it is remembered.
}
}
IMMDeviceEnumerator.GetDefaultAudioEndpoint
失败或没有可用设备,则defaultDevice
可能为null
,这将导致Unity崩溃。具体来说,我在一个用户的机器上遇到了这个问题,由于驱动程序问题,没有有效的声音播放设备。(请参见“控制面板->声音->播放”,禁用所有设备以进行测试。) - sonnyb