c# Winform 마이크 볼륨 확보 마이크 볼륨 조절(자체 노트는 테스트되지 않음)

[DllImport("kernel32.dll", CharSet = CharSet.Auto)]
static extern bool GetVolumeInformation(string Volume, StringBuilder VolumeName, 
	uint VolumeNameSize, out uint SerialNumber, out uint SerialNumberLength, 
	out uint flags, StringBuilder fs, uint fs_size);

//    ：
uint serialNum, serialNumLength, flags;
StringBuilder volumename = new StringBuilder(256);
StringBuilder fstype = new StringBuilder(256); 

bool ok = = GetVolumeInformation(drives, volumename, 
	(uint)volumename.Capacity - 1, out serialNum, out serialNumLength, 
	out flags, fstype, (uint)fstype.Capacity - 1);

if (ok)
 {
 lblVolume.Text = lblVolume.Text + "
 Volume Information of " + drives + "
";
 lblVolume.Text = lblVolume.Text + "
SerialNumber of is..... " + 
	serialNum.ToString() + " 
";
  if (volumename != null)
  {
  lblVolume.Text = lblVolume.Text + "VolumeName is..... " + 
	volumename.ToString() + " 
";
  }
if (fstype != null)
 {
 lblVolume.Text = lblVolume.Text + "FileType is..... " + fstype.ToString() + " 
";
 }

[DllImport("winmm.dll")]
public static extern int waveOutSetVolume(IntPtr hwo, uint dwVolume);

//    
uint CurrVol = 0;
// At this point, CurrVol gets assigned the volume
 waveOutGetVolume(IntPtr.Zero, out CurrVol);
 // Calculate the volume
 ushort CalcVol = (ushort)(CurrVol & 0x0000ffff);
 // Get the volume on a scale of 1 to 10 (to fit the trackbar)
textBox1.Text = (CalcVol / (ushort.MaxValue / 10)).ToString();