我想在winforms中将系统音量设置为65％。有没有我可以导入和使用它的DLL？
我试过
public partial class Form1 : Form
{
private const int APPCOMMAND_VOLUME_MUTE = 0x80000;
private const int APPCOMMAND_VOLUME_UP = 0xA0000;
private const int APPCOMMAND_VOLUME_DOWN = 0x90000;
private const int WM_APPCOMMAND = 0x319;
[DllImport("user32.dll")]
public static extern IntPtr SendMessageW(IntPtr hWnd, int Msg,
IntPtr wParam, IntPtr lParam);
public Form1()
{
InitializeComponent();
}
private void btnDecVol_Click(object sender, EventArgs e)
{
SendMessageW(this.Handle, WM_APPCOMMAND, this.Handle,
(IntPtr)APPCOMMAND_VOLUME_DOWN);
}
private void btnIncVol_Click(object sender, EventArgs e)
{
SendMessageW(this.Handle, WM_APPCOMMAND, this.Handle,
(IntPtr)APPCOMMAND_VOLUME_UP);
}
static class NativeMethods
{
[DllImport("winmm.dll", EntryPoint = "waveOutSetVolume")]
public static extern int WaveOutSetVolume(IntPtr hwo, uint dwVolume);
}
}
但在此我可以增加或减少无法设置完美的价值。我的问题可能是this的重复，但问题的答案不再受支持，因为支持的链接被删除，而其他支持的链接只提供详细的教程，这本身就是一项很好的研究。
答案 0 :(得分：2)
请尝试以下方法：
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Runtime.InteropServices;
namespace ConsoleApplication1
{
class Program
{
static void Main(string[] args)
{
var v = AudioMixerHelper.GetVolume(0x2, 0x4);
AudioMixerHelper.SetVolume(0x2, 0x4, 140);
}
}
class AudioMixerHelper
{
// This is the only error code we will use
public const int MMSYSERR_NOERROR = 0;
//-------------------------------------------------------------------
public const int MAXPNAMELEN = 32;
public const int MIXER_SHORT_NAME_CHARS = 16;
public const int MIXER_LONG_NAME_CHARS = 64;
public const int MIXER_GETLINECONTROLSF_ONEBYTYPE = 2;
public const int MIXER_GETLINEINFOF_COMPONENTTYPE = 3;
public const int MIXER_GETCONTROLDETAILSF_VALUE = 0;
public const int MIXER_SETCONTROLDETAILSF_VALUE = 0;
//-------------------------------------------------------------------
public const int MIXERCONTROL_CT_CLASS_SWITCH = 0x20000000;
public const int MIXERCONTROL_CT_CLASS_FADER = 0x50000000;
public const int MIXERCONTROL_CT_UNITS_BOOLEAN = 0x10000;
public const int MIXERCONTROL_CT_UNITS_UNSIGNED = 0x30000;
//-------------------------------------------------------------------
public const int MIXERCONTROL_CONTROLTYPE_FADER =
(MIXERCONTROL_CT_CLASS_FADER | MIXERCONTROL_CT_UNITS_UNSIGNED);
public const int MIXERCONTROL_CONTROLTYPE_VOLUME =
(MIXERCONTROL_CONTROLTYPE_FADER + 1);
public const int MIXERCONTROL_CONTROLTYPE_BOOLEAN =
(MIXERCONTROL_CT_CLASS_SWITCH | MIXERCONTROL_CT_UNITS_BOOLEAN);
public const int MIXERCONTROL_CONTROLTYPE_MUTE =
(MIXERCONTROL_CONTROLTYPE_BOOLEAN + 2);
//-------------------------------------------------------------------
// SRC COMPONENT TYPE
public const int MIXERLINE_COMPONENTTYPE_SRC_FIRST = 0x1000;
public const int MIXERLINE_COMPONENTTYPE_SRC_LINE =
(MIXERLINE_COMPONENTTYPE_SRC_FIRST + 2);
//-------------------------------------------------------------------
// DST COMPONENT TYPE
public const int MIXERLINE_COMPONENTTYPE_DST_SPEAKERS = 4;
//-------------------------------------------------------------------
// This is the callback notification which we use for synchronization
public const int MM_MIXM_CONTROL_CHANGE = 0x3D1;
//-------------------------------------------------------------------
// This is the parameter used to enable .._CONTROL_CHANGE notifications
public const int CALLBACK_WINDOW = 0x10000;
//-------------------------------------------------------------------
[DllImport("winmm.dll", CharSet = CharSet.Ansi)] // mixerOpen
private static extern int mixerOpen(
out int phmx,
int uMxId,
int dwCallback,
int dwInstance,
int fdwOpen);
[DllImport("winmm.dll", CharSet = CharSet.Ansi)] // mixerClose
private static extern int mixerClose(int hmx);
[DllImport("winmm.dll", CharSet = CharSet.Ansi)] // mixerGetControlDetailsA
private static extern int mixerGetControlDetailsA(
int hmxobj,
ref MIXERCONTROLDETAILS pmxcd,
int fdwDetails);
[DllImport("winmm.dll", CharSet = CharSet.Ansi)] // mixerGetLineControlsA
private static extern int mixerGetLineControlsA(
int hmxobj,
ref MIXERLINECONTROLS pmxlc,
int fdwControls);
[DllImport("winmm.dll", CharSet = CharSet.Ansi)] // mixerGetLineInfoA
private static extern int mixerGetLineInfoA(
int hmxobj,
ref MIXERLINE pmxl,
int fdwInfo);
[DllImport("winmm.dll", CharSet = CharSet.Ansi)] // mixerSetControlDetails
private static extern int mixerSetControlDetails(
int hmxobj,
ref MIXERCONTROLDETAILS pmxcd,
int fdwDetails);
// -----------------------------------------------------------------------
public struct MIXERCONTROL // MIXERCONTROL
{
public int cbStruct; // Size in bytes of MIXERCONTROL
public int dwControlID; // Unique control ID for mixer device
public int dwControlType; // MIXERCONTROL_CONTROLTYPE_xxx
public int fdwControl; // MIXERCONTROL_CONTROLF_xxx
public int cMultipleItems; // If MIXERCONTROL_CONTROLF_MULTIPLE set
[MarshalAs(UnmanagedType.ByValTStr,
SizeConst = MIXER_SHORT_NAME_CHARS)]
public string szShortName; // Short name of control
[MarshalAs(UnmanagedType.ByValTStr,
SizeConst = MIXER_LONG_NAME_CHARS)]
public string szName; // Long name of control
public int lMinimum; // Minimum value
public int lMaximum; // Maximum value
[MarshalAs(UnmanagedType.U4,
SizeConst = 10)]
public int reserved;
}
public struct MIXERCONTROLDETAILS // MIXERCONTROLDETAILS
{
public int cbStruct; // Size in bytes of MIXERCONTROLDETAILS
public int dwControlID; // Control ID to get/set details on
public int cChannels; // Number of channels in paDetails array
public int item; // hwndOwner or cMultipleItems
public int cbDetails; // Size of _one_details_XX struct
public IntPtr paDetails; // Pointer to array of details_XX_struct
}
public struct MIXERCONTROLDETAILS_UNSIGNED // MIXERCONTROLDETAILS_UNSIGNED
{
public int dwValue;
}
public struct MIXERLINE // MIXERLINE
{
public int cbStruct; // Size of MIXERLINE struct
public int dwDestination; // Zero based destination index
public int dwSource; // Zero based source index (if source)
public int dwLineID; // Unique line ID for mixer device
public int fdwLine; // State/information about line
public int dwUser; // Driver specific information
public int dwComponentType; // Component type line connects to
public int cChannels; // Number of channels line supports
public int cConnections; // Number of possible connections
public int cControls; // Number of controls belonging to this line
[MarshalAs(UnmanagedType.ByValTStr,
SizeConst = MIXER_SHORT_NAME_CHARS)]
public string szShortName; // Short name of control
[MarshalAs(UnmanagedType.ByValTStr,
SizeConst = MIXER_LONG_NAME_CHARS)]
public string szName; // Long name of control
public int dwType;
public int dwDeviceID;
public int wMid; // Manufacturer ID
public int wPid; // Product ID
public int vDriverVersion; // Driver Vers. No.
[MarshalAs(UnmanagedType.ByValTStr,
SizeConst = MAXPNAMELEN)]
public string szPname; // Product name
}
public struct MIXERLINECONTROLS // MIXERLINECONTROLS
{
public int cbStruct; // Size in bytes of MIXERLINECONTROLS
public int dwLineID; // Line ID (from MIXERLINE.dwLineID)
// MIXER_GETLINECONTROLSF_ONEBYID or
public int dwControl; // MIXER_GETLINECONTROLSF_ONEBYTYPE
public int cControls; // Number of controls pamxctrl points to
public int cbmxctrl; // Size in bytes of _one_ MIXERCONTROL
public IntPtr pamxctrl; // Pointer to first MIXERCONTROL array
}
// This function attempts to obtain a specified mixer control/component pair -
// returns true if successful.
private static bool GetMixerControl( // GetMixerControl
int hmixer,
int component,
int control,
out MIXERCONTROL mxc,
out int vCurrentVol)
{
bool retValue = false;
mxc = new MIXERCONTROL();
MIXERLINECONTROLS mxlc = new MIXERLINECONTROLS();
MIXERLINE mxl = new MIXERLINE();
MIXERCONTROLDETAILS pmxcd = new MIXERCONTROLDETAILS();
MIXERCONTROLDETAILS_UNSIGNED du = new MIXERCONTROLDETAILS_UNSIGNED();
vCurrentVol = -1; // A dummy value
mxl.cbStruct = Marshal.SizeOf(mxl);
mxl.dwComponentType = component;
int rc = mixerGetLineInfoA(
hmixer,
ref mxl,
MIXER_GETLINEINFOF_COMPONENTTYPE);
if (MMSYSERR_NOERROR == rc)
{
int sizeofMIXERCONTROL = 152;
int ctrl = Marshal.SizeOf(typeof(MIXERCONTROL));
mxlc.pamxctrl = Marshal.AllocCoTaskMem(sizeofMIXERCONTROL);
mxlc.cbStruct = Marshal.SizeOf(mxlc);
mxlc.dwLineID = mxl.dwLineID;
mxlc.dwControl = control;
mxlc.cControls = 1;
mxlc.cbmxctrl = sizeofMIXERCONTROL;
// Allocate a buffer for the control
mxc.cbStruct = sizeofMIXERCONTROL;
// Get the control
rc = mixerGetLineControlsA(
hmixer,
ref mxlc,
MIXER_GETLINECONTROLSF_ONEBYTYPE);
if (MMSYSERR_NOERROR == rc)
{
retValue = true;
// Copy the control into the destination structure
mxc = (MIXERCONTROL)Marshal.PtrToStructure(
mxlc.pamxctrl,
typeof(MIXERCONTROL));
}
int sizeofMIXERCONTROLDETAILS =
Marshal.SizeOf(typeof(MIXERCONTROLDETAILS));
int sizeofMIXERCONTROLDETAILS_UNSIGNED =
Marshal.SizeOf(typeof(MIXERCONTROLDETAILS_UNSIGNED));
pmxcd.cbStruct = sizeofMIXERCONTROLDETAILS;
pmxcd.dwControlID = mxc.dwControlID;
pmxcd.paDetails = Marshal.AllocCoTaskMem(sizeofMIXERCONTROLDETAILS_UNSIGNED);
pmxcd.cChannels = 1;
pmxcd.item = 0;
pmxcd.cbDetails = sizeofMIXERCONTROLDETAILS_UNSIGNED;
rc = mixerGetControlDetailsA(
hmixer,
ref pmxcd,
MIXER_GETCONTROLDETAILSF_VALUE);
du = (MIXERCONTROLDETAILS_UNSIGNED)Marshal.PtrToStructure(
pmxcd.paDetails,
typeof(MIXERCONTROLDETAILS_UNSIGNED));
vCurrentVol = du.dwValue;
return retValue; // true
}
return retValue; // false
}
private static bool SetVolumeControl( // SetVolumeControl
int hmixer,
MIXERCONTROL mxc,
int volume)
{
bool retValue = false;
int rc;
MIXERCONTROLDETAILS mxcd = new MIXERCONTROLDETAILS();
MIXERCONTROLDETAILS_UNSIGNED vol = new MIXERCONTROLDETAILS_UNSIGNED();
mxcd.item = 0;
mxcd.dwControlID = mxc.dwControlID;
mxcd.cbStruct = Marshal.SizeOf(mxcd);
mxcd.cbDetails = Marshal.SizeOf(vol);
// Allocate a buffer for the control value buffer
mxcd.cChannels = 1;
vol.dwValue = volume;
// Copy the data into the control value buffer
mxcd.paDetails = Marshal.AllocCoTaskMem(
Marshal.SizeOf(typeof(MIXERCONTROLDETAILS_UNSIGNED)));
Marshal.StructureToPtr(
vol,
mxcd.paDetails,
false);
// Set the control value
rc = mixerSetControlDetails(
hmixer,
ref mxcd,
MIXER_SETCONTROLDETAILSF_VALUE);
return retValue = MMSYSERR_NOERROR == rc ? true : false;
}
public static int GetVolume(int control, int component) // GetVolume
{
int hmixer = 0;
int currVol = -1;
MIXERCONTROL volCtrl = new MIXERCONTROL();
int rc = mixerOpen(
out hmixer,
0,
0,
0,
0);
bool b = GetMixerControl(
hmixer,
component,
control,
out volCtrl, // Not used
out currVol);
mixerClose(hmixer);
return currVol;
}
public static void SetVolume(int control, int component, int newVol) // SetVolume
{
int hmixer = 0;
int currentVol;
MIXERCONTROL volCtrl = new MIXERCONTROL();
mixerOpen(
out hmixer,
0,
0,
0,
0);
GetMixerControl(
hmixer,
component,
control,
out volCtrl,
out currentVol); // Not used
SetVolumeControl(hmixer, volCtrl, newVol);
mixerClose(hmixer);
}
public static bool MonitorControl(int iw) // iw is the window handle // MonitorControl
{
int rc = -1;
bool retValue = false;
int hmixer;
rc = mixerOpen(
out hmixer,
0,
iw,
0,
CALLBACK_WINDOW);
return retValue = (MMSYSERR_NOERROR == rc) ? true : false;
}
public static int CheckMixer() // CheckMixer
{
int retValue = -1;
int rc1, rc2 = -1;
int hmixer;
rc1 = mixerOpen(
out hmixer,
0,
0,
0,
0);
rc2 = mixerClose(hmixer);
return retValue = (MMSYSERR_NOERROR == rc1) && (MMSYSERR_NOERROR == rc2) ? MMSYSERR_NOERROR : retValue;
}
public static int GetControlID(int component, int control) // GetControlID
{
MIXERCONTROL mxc = new MIXERCONTROL();
int _i; // Though we won't need _i, it still must be declared
bool b = false;
int retValue = 0;
b = GetMixerControl(
0,
component,
control,
out mxc,
out _i);
return retValue = b ? mxc.dwControlID : -1;
}
}
}
如果仍然无效，请尝试Naudio（https://naudio.codeplex.com/）并按如下方式致电：
public void SetVolume(int level)
{
try
{
//Instantiate an Enumerator to find audio devices
NAudio.CoreAudioApi.MMDeviceEnumerator MMDE = new NAudio.CoreAudioApi.MMDeviceEnumerator();
//Get all the devices, no matter what condition or status
NAudio.CoreAudioApi.MMDeviceCollection DevCol = MMDE.EnumerateAudioEndPoints(NAudio.CoreAudioApi.DataFlow.All, NAudio.CoreAudioApi.DeviceState.All);
//Loop through all devices
foreach (NAudio.CoreAudioApi.MMDevice dev in DevCol)
{
try
{
if (dev.State == NAudio.CoreAudioApi.DeviceState.Active)
{
var newVolume = (float)Math.Max(Math.Min(level, 100),0) / (float)100;
//Set at maximum volume
dev.AudioEndpointVolume.MasterVolumeLevelScalar = newVolume;
dev.AudioEndpointVolume.Mute = level == 0;
//Get its audio volume
_log.Info("Volume of " + dev.FriendlyName + " is " + dev.AudioEndpointVolume.MasterVolumeLevelScalar.ToString());
}
else
{
_log.Debug("Ignoring device " + dev.FriendlyName + " with state " + dev.State);
}
}
catch (Exception ex)
{
//Do something with exception when an audio endpoint could not be muted
_log.Warn(dev.FriendlyName + " could not be muted with error " + ex);
}
}
}
catch (Exception ex)
{
//When something happend that prevent us to iterate through the devices
_log.Warn("Could not enumerate devices due to an excepion: " + ex.Message);
}
}