如何以编程方式更改系统卷 [英] How to change the System Volume programmatically

问题描述

我想更改系统的音量。我使用以下代码：

 使用系统; 
 使用 System.Collections.Generic; 
 使用 System.Linq; 
 使用 System.Text; 
 使用 System.Windows.Forms; 
 使用 System.Runtime.InteropServices; 
 命名空间 shaped_form 
 {
  class  VolumeChange 
 { 
  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 消息， IntPtr  wParam， IntPtr  lParam）; 
  private   void  btnMute_Click（ object  sender，EventArgs e）
 {
 SendMessageW（  this  .Handle ，WM_APPCOMMAND，  this  .Handle ，（ IntPtr ）APPCOMMAND_VOLUME_MUTE）; 
} 
  private   void  btnDecVol_Click（ object  sender，EventArgs e）
 {
 SendMessageW（  this  .Handle ，WM_APPCOMMAND，< b>  this  .Handle ，（ IntPtr ）APPCOMMAND_VOLUME_DOWN）; 
} 
 私有  void  btnIncVol_Click（ object  sender，EventArgs e）
 {
 SendMessageW（  this  .Handle ，WM_APPCOMMAND，< b>  this  .Handle ，（ IntPtr ）APPCOMMAND_VOLUME_UP）; 
} 
} 
} 

但是我在突出显示的位置出现错误，因为shaped_form.VolumeChange不包含定义处理。我从一些互联网资源获得此代码。

并且还请告诉我关于 Intptr 的信息，这里很重要。

解决方案

去看看这个链接

http ：//msdn.microsoft.com/en-us/library/aa719104.aspx

I want to change the System's Volume. I am using following code:

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Windows.Forms;
using System.Runtime.InteropServices;
namespace shaped_form
{
class VolumeChange
{
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);
private void btnMute_Click(object sender, EventArgs e)
{
SendMessageW(this.Handle, WM_APPCOMMAND, this.Handle,(IntPtr)APPCOMMAND_VOLUME_MUTE);
}
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);
}
}
}

But I got an error at the highlighted places as "shaped_form.VolumeChange does not contain a definition for Handle". I got this code from some internet sources.
and also please tell me about Intptr and it's importance here.

解决方案

go and see this link
http://msdn.microsoft.com/en-us/library/aa719104.aspx

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