How to control the volume of Windows system using C # _c language

Source: Internet
Author: User

C # often needs to control the volume of the system in developing Windows applications, in two ways:

1. Use Win API control

2. Using C + + DLL control

Win API Control:

The system volume can be controlled using both user32.dll and Winmm.dll, and the difference is the version of the win system. Winmm.dll XP environment available, User32.dll Vista and above version.

C + + DLL control:

Coreaudioapi is the third party in C + + encapsulates the volume control, download the DLL on the Internet and then reference in the project can be used. Coreaudioapi Vista and above version support.

The following code

1.WINMM control mode, involving the XP system waveform sound of the left and right channel, high for the left-hand channel, low for the right-hand channel:

Copy Code code as follows:

[DllImport ("Winmm.dll", EntryPoint = "Waveoutsetvolume")]
public static extern int Waveoutsetvolume (IntPtr hwo, uint dwvolume);

private void Setvol (double arg) {
Double Newvolume = ushort. MaxValue * arg/10.0;

UINT v = ((UINT) newvolume) & 0xFFFF;
UINT Vall = v | (v << 16);

int retVal = Waveoutsetvolume (IntPtr.Zero, Vall);

2.user32 control mode:
Copy Code code as follows:

[DllImport ("user32.dll")]
public static extern IntPtr Sendmessagew (IntPtr hWnd, int Msg, IntPtr wParam, IntPtr lParam);

public void Setvol () {
p = process.getcurrentprocess ();
for (int i = 0; i < 5; i++) {
Sendmessagew (P.handle, Wm_appcommand, P.handle, (INTPTR) appcommand_volume_up);

Private Process p;
Private Const int appcommand_volume_mute = 0x80000;
Private Const int APPCOMMAND_VOLUME_UP = 0x0a0000;
Private Const int appcommand_volume_down = 0x090000;
Private Const int wm_appcommand = 0x319;

Copy Code code as follows:

Using Coreaudioapi;

public void Setvol (double arg) {
device = Devenum.getdefaultaudioendpoint (Edataflow.erender, Erole.emultimedia);
Device. Audioendpointvolume.mastervolumelevelscalar = (float) arg;

private Mmdevice device;
Private Mmdeviceenumerator Devenum = new Mmdeviceenumerator ();

Related Article

Contact Us

The content source of this page is from Internet, which doesn't represent Alibaba Cloud's opinion; products and services mentioned on that page don't have any relationship with Alibaba Cloud. If the content of the page makes you feel confusing, please write us an email, we will handle the problem within 5 days after receiving your email.

If you find any instances of plagiarism from the community, please send an email to: and provide relevant evidence. A staff member will contact you within 5 working days.

A Free Trial That Lets You Build Big!

Start building with 50+ products and up to 12 months usage for Elastic Compute Service

  • Sales Support

    1 on 1 presale consultation

  • After-Sales Support

    24/7 Technical Support 6 Free Tickets per Quarter Faster Response

  • Alibaba Cloud offers highly flexible support services tailored to meet your exact needs.