/// <summary>
/// 定位音频播放位置
/// </summary>
/// <param name="position">音频播放位置</param>
public void Seek(TimeSpan position)
{
if (m_DeviceID != 0)
{
MCI_SEEK_PARMS sp = new MCI_SEEK_PARMS();
sp.dwCallback = IntPtr.Zero;
sp.dwTo = Convert.ToUInt32(position.TotalMilliseconds);
IntPtr spPointer = Marshal.AllocHGlobal(Marshal.SizeOf(sp));
try
{
Marshal.StructureToPtr(sp, spPointer, false);
UInt32 errorCode = mciSendCommand(m_DeviceID, (UInt32)MCI_Command.MCI_SEEK, (UInt32)(MCI_SeekFlags.MCI_WAIT | MCI_SeekFlags.MCI_TO), spPointer);
CheckError(errorCode);
if (Paused == true)
{
return;
}
else
{
m_Paused = true;
Play();
}
}
finally
{
Marshal.FreeHGlobal(spPointer);
}
}
else
{
throw new InvalidOperationException("Sound device has already closed.");
}
}
private void SeekToAny(int Value)
{
int err;
StringBuilder buf = new StringBuilder(1000);
MCI_SEEK_PARMS SeekParms = new MCI_SEEK_PARMS();
if (deviceID > 0)
{
if (Value > 0 && Value < Length)
{
SeekParms.dwTo = Value;
//跳转的目标时间，时间单位为毫秒
err = mciSendCommandA(deviceID, MCI_SEEK, MCI_TO | MCI_WAIT, ref SeekParms);
if (err != 0)
{
mciGetErrorStringA(err, buf, 1000);
//throw new ApplicationException(buf.ToString());
}
Play();
}
else if (Value >= Length)
Next();
else
Previous();
}
}
private static extern int mciSendCommandSeek(int wDeviceID, int uMessage, int dwParam1, ref MCI_SEEK_PARMS dwParam2);
private static extern int mciSendCommandA(
Int32 wDeviceID,
UInt32 uMessage,
Int32 dwParam,
ref MCI_SEEK_PARMS Any);
