/// <summary>
///
/// </summary>
/// <param name="synchronized"></param>
private void Play(Boolean synchronized)
{
if (m_DeviceID == 0)
{
Load();
}
// Play current audio file or resume playing
if (m_DeviceID != 0)
{
if (m_Paused)
{
// Play from current position
MCI_PLAY_PARMS pp = new MCI_PLAY_PARMS();
pp.dwCallback = IntPtr.Zero;
IntPtr ppPointer = Marshal.AllocHGlobal(Marshal.SizeOf(pp));
try
{
Marshal.StructureToPtr(pp, ppPointer, false);
UInt32 errorCode = mciSendCommand(m_DeviceID, (UInt32)MCI_Command.MCI_PLAY, (UInt32)(synchronized ? MCI_OpenFlags.MCI_WAIT : MCI_OpenFlags.MCI_NOTIFY), ppPointer);
CheckError(errorCode);
m_Paused = false;
return;
}
finally
{
Marshal.FreeHGlobal(ppPointer);
}
}
else
{
//Stop();
MCI_PLAY_PARMS pp = new MCI_PLAY_PARMS();
pp.dwCallback = IntPtr.Zero;
pp.dwFrom = 0;
IntPtr ppPointer = Marshal.AllocHGlobal(Marshal.SizeOf(pp));
try
{
Marshal.StructureToPtr(pp, ppPointer, false);
UInt32 errorCode = mciSendCommand(m_DeviceID, (UInt32)MCI_Command.MCI_PLAY, (UInt32)((synchronized ? MCI_OpenFlags.MCI_WAIT : MCI_OpenFlags.MCI_NOTIFY) | MCI_OpenFlags.MCI_FROM), ppPointer);
CheckError(errorCode);
m_IsPlaying = true;
return;
}
finally
{
Marshal.FreeHGlobal(ppPointer);
}
}
}
else
{
throw new InvalidOperationException("Sound device has already closed.");
}
}
/// <summary>
/// 从当前位置开始或在一个指定区段播放多媒体文件。
/// </summary>
public void Play()
{
int err;
int flags = 0;
StringBuilder buf = new StringBuilder(1000);
if (deviceID > 0 && PlayState != PlayState.Play)
{
if ((devCaps & DevCaps.CanPlay) == DevCaps.CanPlay)
{
if (deviceType == DeviceType.CDAudio || deviceType == DeviceType.VideoDisc)
{
if (GetStatus(MCI_STATUS_MEDIA_PRESENT) <= 0)
{
//throw new ApplicationException("设备中没有光盘，请先放入光盘。");
}
}
if ((int)timer.Tag == 0)
{
timer.Tag = 1;
timer.Start();
}
MCI_PLAY_PARMS mciplay = new MCI_PLAY_PARMS();
if (useFrom && startPos != 0)
{
mciplay.dwFrom = startPos;
flags |= MCI_FROM;
useFrom = false;
}
if (useTo && endPos != 0)
{
mciplay.dwTo = endPos;
flags |= MCI_TO;
useTo = false;
}
err = mciSendCommandA(deviceID, MCI_PLAY, flags, ref mciplay);
if (err != 0)
{
mciGetErrorStringA(err, buf, 1000);
//throw new ApplicationException("播放出错，" + buf.ToString());
}
else
{
if (hWndDisplay == IntPtr.Zero)
rect = new Rectangle(0, 0, VideoSize.Width, VideoSize.Height);
ShowDisplay(rect);
}
}
else
{
Close();
//throw new ApplicationException("播放出错，该文件不能播放。");
}
}
}
public static extern Int32 mciSendCommand(UInt32 wDeviceID,
e_MSI_CONMMAND uMsg, UInt32 fdwCommand, ref MCI_PLAY_PARMS dwParam);
private static extern int mciSendCommandA(
Int32 wDeviceID,
UInt32 uMessage,
Int32 dwParam,
ref MCI_PLAY_PARMS Any);
