private void SetAudio(AudioSource audio)
{
MCI_DGV_SETAUDIO_PARMS s = new MCI_DGV_SETAUDIO_PARMS();
int err;
StringBuilder buf = new StringBuilder(1000);
if (deviceID > 0)
{
err = mciSendCommandA(deviceID, MCI_SETAUDIO, MCI_WAIT | MCI_SET_OFF, ref s);
if (err != 0)
{
mciGetErrorStringA(err, buf, 1000);
//throw new ApplicationException("设置声道出错，" + buf.ToString());
}
else
{
switch (audio)
{
case AudioSource.Left:
s.dwValue = MCI_DGV_SETAUDIO_SOURCE_LEFT;
break;
case AudioSource.Stereo:
s.dwValue = MCI_DGV_SETAUDIO_SOURCE_STEREO;
break;
case AudioSource.Right:
s.dwValue = MCI_DGV_SETAUDIO_SOURCE_RIGHT;
break;
}
s.dwItem = MCI_DGV_SETAUDIO_SOURCE;
err = mciSendCommandA(deviceID, MCI_SETAUDIO, MCI_DGV_SETAUDIO_VALUE | MCI_DGV_SETAUDIO_ITEM, ref s);
if (err != 0)
{
mciGetErrorStringA(err, buf, 1000);
//throw new ApplicationException("设置声道出错，" + buf.ToString());
}
else
{
s.dwValue = MCI_DGV_SETAUDIO_SOURCE_AVERAGE;
s.dwItem = MCI_DGV_SETAUDIO_SOURCE;
err = mciSendCommandA(deviceID, MCI_SETAUDIO, MCI_DGV_SETAUDIO_VALUE | MCI_DGV_SETAUDIO_ITEM, ref s);
if (err != 0)
{
mciGetErrorStringA(err, buf, 1000);
//throw new ApplicationException("设置声道出错，" + buf.ToString());
}
else
{
err = mciSendCommandA(deviceID, MCI_SETAUDIO, MCI_WAIT | MCI_SET_ON, ref s);
if (err != 0)
{
mciGetErrorStringA(err, buf, 1000);
//throw new ApplicationException("设置声道出错，" + buf.ToString());
}
}
}
}
}
}
private void SetVolume(int volume)
{
int err;
StringBuilder buf = new StringBuilder(1000);
MCI_DGV_SETAUDIO_PARMS mdsp = new MCI_DGV_SETAUDIO_PARMS();
if (deviceID > 0)
{
err = mciSendCommandA(deviceID, MCI_SETAUDIO, MCI_WAIT | MCI_SET_OFF, ref mdsp);
if (err != 0)
{
mciGetErrorStringA(err, buf, 1000);
//throw new ApplicationException("设置声音出错，" + buf.ToString());
}
else
{
if (volume > MAX_VOLUME)
volume = MAX_VOLUME;
if (volume < MIN_VOLUME)
volume = MIN_VOLUME;
mdsp.dwValue = volume;
mdsp.dwItem = MCI_DGV_SETAUDIO_VOLUME;
err = mciSendCommandA(deviceID, MCI_SETAUDIO, MCI_DGV_SETAUDIO_VALUE | MCI_DGV_SETAUDIO_ITEM, ref mdsp);
if (err != 0)
{
mciGetErrorStringA(err, buf, 1000);
//throw new ApplicationException("设置声音出错，" + buf.ToString());
}
else
{
err = mciSendCommandA(deviceID, MCI_SETAUDIO, MCI_WAIT | MCI_SET_ON, ref mdsp);
if (err != 0)
{
mciGetErrorStringA(err, buf, 1000);
//throw new ApplicationException("设置声音出错，" + buf.ToString());
}
}
}
}
}
private static extern int mciSendCommandA(
Int32 wDeviceID,
UInt32 uMessage,
Int32 dwParam,
ref MCI_DGV_SETAUDIO_PARMS Any);
