/// <summary>Opens a MIDI file.</summary>
/// <remarks>Used interally only.</remarks>
/// <exceptions cref="MediaException">Thrown when there was an error opening the file.</exceptions>
/// <exceptions cref="FileNotFoundException">Thrown when the specified file could not be found.</exceptions>
protected void OpenFile()
{
if (!File.Exists(Filename))
{
throw new FileNotFoundException();
}
MCI_OPEN_PARMS mciOpenParms = new MCI_OPEN_PARMS();
mciOpenParms.lpstrDeviceType = "sequencer";
mciOpenParms.lpstrElementName = Filename;
if (mciSendCommandOpen(0, MCI_OPEN, MCI_OPEN_TYPE | MCI_OPEN_ELEMENT, ref mciOpenParms) != 0)
{
throw new MediaException("Failed to open the MIDI device.");
}
// The device opened successfully; get the device ID.
DeviceID = mciOpenParms.wDeviceID;
// Get the length of the MIDI file
MCI_STATUS_PARMS mciStatusParms = new MCI_STATUS_PARMS();
mciStatusParms.dwItem = MCI_STATUS_LENGTH;
if (mciSendCommandStatus(DeviceID, MCI_STATUS, MCI_WAIT | MCI_STATUS_ITEM, ref mciStatusParms) != 0)
{
throw new MediaException("Couldn't get the length of the specified MIDI file.");
}
m_Length = mciStatusParms.dwReturn;
}
/// <summary>
///
/// </summary>
private void Open()
{
MCI_OPEN_PARMS op = new MCI_OPEN_PARMS();
op.dwCallback = IntPtr.Zero;
op.lpstrDeviceType = null;
op.lpstrElementName = this.SoundLocation;
op.lpstrAlias = null;
op.wDeviceID = 0;
MCI_OpenFlags flags = 0;
//if (deviceType != 0)
//{
// flags = MCI_OpenFlags.MCI_OPEN_TYPE | MCI_OpenFlags.MCI_OPEN_TYPE_ID | MCI_OpenFlags.MCI_OPEN_ELEMENT | MCI_OpenFlags.MCI_WAIT;
//}
//else
//{
flags = MCI_OpenFlags.MCI_OPEN_ELEMENT | MCI_OpenFlags.MCI_WAIT;
//}
IntPtr opPointer = Marshal.AllocHGlobal(Marshal.SizeOf(op));
try
{
Marshal.StructureToPtr(op, opPointer, false);
UInt32 errorCode = mciSendCommand(0, (UInt32)MCI_Command.MCI_OPEN, (UInt32)flags, opPointer);
CheckError(errorCode);
MCI_OPEN_PARMS op2 = (MCI_OPEN_PARMS)Marshal.PtrToStructure(opPointer, typeof(MCI_OPEN_PARMS));
m_DeviceID = op2.wDeviceID;
}
finally
{
Marshal.FreeHGlobal(opPointer);
}
MCI_SET_PARMS sp = new MCI_SET_PARMS();
sp.dwCallback = IntPtr.Zero;
sp.dwTimeFormat = MCI_Format.MCI_FORMAT_MILLISECONDS;
IntPtr spPointer = Marshal.AllocHGlobal(Marshal.SizeOf(sp));
try
{
Marshal.StructureToPtr(sp, spPointer, false);
UInt32 errorCode = mciSendCommand(m_DeviceID, (UInt32)MCI_Command.MCI_SET, (UInt32)(MCI_SetFlags.MCI_SET_TIME_FORMAT | MCI_SetFlags.MCI_WAIT), spPointer);
CheckError(errorCode);
if (errorCode != 0)
{
Close();
}
}
finally
{
Marshal.FreeHGlobal(spPointer);
}
}
public Dictionary<string, int> GetListSongTime(IEnumerable<string> listSong, bool isAdd)
{
Dictionary<string, int> dicSongInfo = new Dictionary<string, int>();
int i = 10000;
foreach (string fileFullName in listSong)
{
int err;
int paras = 0;
StringBuilder buf = new StringBuilder(1000);
MCI_OPEN_PARMS op = new MCI_OPEN_PARMS();
if (deviceID > 0)
{
//if (!isAdd)
//{
Close();
//}
}
if ((int)timer.Tag == 1)
{
timer.Tag = 0;
timer.Stop();
}
if (fileFullName.ToString() == "" && deviceType != DeviceType.CDAudio && deviceType != DeviceType.VideoDisc
&& deviceType != DeviceType.WaveAudio && deviceType != DeviceType.Overlay)
{
//throw new ApplicationException("要打开的文件名为空！");
}
paras = MCI_WAIT;
if (deviceType != DeviceType.CDAudio && deviceType != DeviceType.VideoDisc)
paras |= MCI_OPEN_ELEMENT;
if (deviceType != DeviceType.AutoSelect)
{
if (deviceType == DeviceType.OwnerSelect)
op.lpstrDeviceType = GetDriverType(fileFullName);
else
op.lpstrDeviceType = deviceType.ToString();
paras = paras | MCI_OPEN_TYPE;
}
if (shareAble)
{
if (fileFullName != string.Empty && deviceType != DeviceType.WaveAudio && deviceType != DeviceType.Overlay)
paras = paras | MCI_OPEN_SHAREABLE;
}
op.dwCallback = 0;
op.wDeviceID = 0;
op.lpstrElementName = fileFullName;
err = mciSendCommandA(0, MCI_OPEN, paras, ref op);
deviceID = op.wDeviceID;
dicSongInfo.Add(fileFullName+(i++), Length);
}
return dicSongInfo;
}
/// <summary>
/// 打开多媒体文件。
/// </summary>
public void Open()
{
int err;
int paras = 0;
StringBuilder buf = new StringBuilder(1000);
MCI_OPEN_PARMS op = new MCI_OPEN_PARMS();
if (deviceID > 0)
Close();
if ((int)timer.Tag == 1)
{
timer.Tag = 0;
timer.Stop();
}
if (fileName.ToString() == "" && deviceType != DeviceType.CDAudio && deviceType != DeviceType.VideoDisc
&& deviceType != DeviceType.WaveAudio && deviceType != DeviceType.Overlay)
{
//throw new ApplicationException("要打开的文件名为空！");
}
paras = MCI_WAIT;
if (deviceType != DeviceType.CDAudio && deviceType != DeviceType.VideoDisc)
paras |= MCI_OPEN_ELEMENT;
if (deviceType != DeviceType.AutoSelect)
{
if (deviceType == DeviceType.OwnerSelect)
op.lpstrDeviceType = GetDriverType(fileName);
else
op.lpstrDeviceType = deviceType.ToString();
paras = paras | MCI_OPEN_TYPE;
}
if (shareAble)
{
if (fileName != string.Empty && deviceType != DeviceType.WaveAudio && deviceType != DeviceType.Overlay)
paras = paras | MCI_OPEN_SHAREABLE;
}
op.dwCallback = 0;
op.wDeviceID = 0;
op.lpstrElementName = fileName;
err = mciSendCommandA(0, MCI_OPEN, paras, ref op);
if (err != 0)
{
deviceID = 0;
mciGetErrorStringA(err, buf, 1000);
throw new ApplicationException("打开文件出错，" + buf.ToString());
}
else
{
deviceID = op.wDeviceID;
try
{
GetDevcaps();
//以帧快进有问题，去掉
/*
if ((devCaps & DevCaps.CanShowVideo) != DevCaps.CanShowVideo)
{
if (framesStep == 0)
framesStep = 3000;
}
*/
if (framesStep == 0)
framesStep = Length / 200;
if (deviceType == DeviceType.CDAudio || deviceType == DeviceType.VideoDisc)
{
timeFormat = TimeFormat.TMSF; //set timeformat to use tracks
MciSet(0, (int)timeFormat, MCI_WAIT | MCI_SET_TIME_FORMAT);
}
else
{
if (timeFormat != TimeFormat.Default)
MciSet(0, (int)timeFormat, MCI_WAIT | MCI_SET_TIME_FORMAT);
}
try
{
size = GetVideoSize();
SetVolume(volume);
SetAudio(audioSource);
SetMute(mute);
}
catch { }
}
catch (Exception ex)
{
//throw new ApplicationException("打开文件出错，" + ex.ToString());
}
}
}
private static extern int mciSendCommandOpen(int wDeviceID, int uMessage, int dwParam1, ref MCI_OPEN_PARMS dwParam2);
public static extern Int32 mciSendCommand(UInt32 wDeviceID,
e_MSI_CONMMAND uMsg, UInt32 fdwCommand, ref MCI_OPEN_PARMS dwParam);
private static extern int mciSendCommandA(
Int32 wDeviceID, //����������豸ID,�� MCI_OPEN �����wDeviceID��������
UInt32 uMessage, //MCI ����
Int32 dwParam, //flags �б�����һ�㶼�� DWORD dwParam �е���س�Ա���ʹ��
ref MCI_OPEN_PARMS Any);
