IMediaDet::WriteBitmapBits
| Microsoft DirectShow 9.0 |
IMediaDet::WriteBitmapBits
The WriteBitmapBits method retrieves a video frame at the specified media time and writes it to a file. The video frame is always in 24-bit RGB format.
Syntax
HRESULT WriteBitmapBits(
double StreamTime,
long Width,
long Height,
BSTR Filename
);
Parameters
StreamTime
Time at which to retrieve the video frame.
Width
Width of the image, in pixels.
Height
Height of the image, in pixels.
Filename
Path of the file in which to save the bitmap. If the file already exists, this method overwrites it.
Return Value
Returns S_OK it successful. Otherwise, returns an HRESULT value that indicates the cause of the error. Possible error codes include the following:
| Value | Description |
| E_NOINTERFACE | Could not add the Sample Grabber filter to the graph. |
| E_FAIL | Failure. |
| E_OUTOFMEMORY | Insufficient memory. |
| E_UNEXPECTED | Unexpected error. |
| STG_E_ACCESSDENIED | Cannot overwrite file. |
| VFW_E_INVALIDMEDIATYPE | Invalid media type. |
Remarks
Before calling this method, set the file name and stream by calling IMediaDet::put_Filename and IMediaDet::put_CurrentStream.
This method puts the media detector into bitmap grab mode. Once this method has been called, the various stream information methods in IMediaDet do not work, unless you create a new instance of the media detector.
Requirements
Header: Include Qedit.h. This header file is not compatible with Microsoft® Direct3D® headers later than version 7.
Library: Use strmiids.lib.
See Also