The IDirectMusicTrack::IsParamSupported method determines whether the track supports a given data type in the IDirectMusicTrack::GetParam and IDirectMusicTrack::SetParam methods.
HRESULT IsParamSupported(
REFGUID rguidType
);
If the method succeeds and the type is supported, the return value is S_OK.
If it fails, the method may return one of the following error values:
| DMUS_E_TYPE_DISABLED |
| DMUS_E_TYPE_UNSUPPORTED |
| E_POINTER |
| E_NOTIMPL |
If a message type has been disabled by using one of the SetParam methods (see Disabling and Enabling Messages on a Track), the IDirectMusicTrack::IsParamSupported method returns DMUS_E_TYPE_DISABLED when passed the corresponding parameter type (either GUID_TempoParam or GUID_TimeSignature).
The method also returns DMUS_E_TYPE_DISABLED if passed GUID_DisableTempo when that message type has already been disabled, or if passed GUID_EnableTempo when that message type is currently enabled. The same is true for GUID_DisableTimeSig and GUID_EnableTimeSig.
The method returns DMUS_E_TYPE_UNSUPPORTED when the track does not support the message type referred to by a GUID_EnableTempo, GUID_EnableTimeSig, GUID_DisableTempo, or GUID_DisableTimeSig parameter type.
Windows NT/2000: Requires Windows 2000.
Windows 95/98: Requires Windows 95 or later. Available as a redistributable for Windows 95.
Header: Declared in dmusici.h.
IDirectMusicTrack::GetParam, IDirectMusicTrack::SetParam, Music Parameters