| Microsoft DirectX 8.1 (C++) |
The get_StreamType method retrieves the globally unique identifier (GUID) for the media type of the current stream.
Syntax
HRESULT get_StreamType(
GUID *pVal
);
Parameters
pVal
[out, retval] Pointer to a variable that receives the major type GUID for the media type.
Return Value
Returns an HRESULT value. Possible values include the following:
| Value | Description |
| S_OK | Success. |
| E_INVALIDARG | Invalid argument. |
| E_POINTER | NULL pointer argument. |
Remarks
This method retrieves the majortype member of the AM_MEDIA_TYPE structure. The AM_MEDIA_TYPE structure describes the format of the stream, and the majortype member is a GUID that indicates the general category, such as audio or video. For a video stream, the GUID is MEDIATYPE_Video. For audio, it is MEDIATYPE_Audio. To retrieve the entire AM_MEDIA_TYPE structure, call the IMediaDet::get_StreamMediaType method.
Before calling this method, set the file name and stream by calling IMediaDet::put_Filename and IMediaDet::put_CurrentStream.
If the media detector is in bitmap grab mode, this method returns E_INVALIDARG. For more information, see IMediaDet::EnterBitmapGrabMode.
See Also