| Microsoft DirectX 9.0 |
The RenderFile method builds a filter graph that renders the specified file.
Syntax
HRESULT RenderFile(
LPCWSTR lpwstrFile,
LPCWSTR lpwstrPlayList
);
Parameters
lpwstrFile
[in] Specifies a wide-character string that contains the name of a media file.
lpwstrPlayList
[in] Reserved. Must be NULL.
Return Value
Returns an HRESULT. Possible values include the following.
| Value | Description |
| S_OK | Success. |
| VFW_S_AUDIO_NOT_RENDERED | Partial success; the audio was not rendered. |
| VFW_S_DUPLICATE_NAME | Success; the Filter Graph Manager modified the filter name to avoid duplication. |
| VFW_S_PARTIAL_RENDER | Some of the streams in this movie are in an unsupported format. |
| VFW_S_VIDEO_NOT_RENDERED | Partial success; some of the streams in this movie are in an unsupported format. |
| E_ABORT | Operation aborted. |
| E_FAIL | Failure. |
| E_INVALIDARG | Argument is invalid. |
| E_OUTOFMEMORY | Insufficient memory. |
| E_POINTER | NULL pointer argument. |
| VFW_E_CANNOT_CONNECT | No combination of intermediate filters could be found to make the connection. |
| VFW_E_CANNOT_LOAD_SOURCE_FILTER | The source filter for this file could not be loaded. |
| VFW_E_CANNOT_RENDER | No combination of filters could be found to render the stream. |
| VFW_E_INVALID_FILE_FORMAT | The file format is invalid. |
| VFW_E_NOT_FOUND | An object or name was not found. |
| VFW_E_UNKNOWN_FILE_TYPE | The media type of this file is not recognized. |
| VFW_E_UNSUPPORTED_STREAM | Cannot play back the file: the format is not supported. |
Remarks
If the lpwstrFile parameter specifies a media file, the method builds a filter graph for default playback. First it adds a source filter that can read the file, using the same process as the IGraphBuilder::AddSourceFilter method. Then it renders the output pins on the source filter, adding intermediate filters if necessary. It tries filters in the same order as the IGraphBuilder::Connect method.
During the connection process, the Filter Graph Manager ignores pins on intermediate filters if the pin name begins with a tilde (~). For more information, see PIN_INFO.
Note that the RenderFile method does not remove any filters from the graph. If you call RenderFile twice, the second call simply adds more filters to the graph. When you run the graph, both sources will play at the same time.
Example Code
The following example renders an AVI file for default playback:
hr = pGraph->RenderFile(L"C:\\Media\\Example.avi", 0);
The following example downloads an AVI file over HTTP, using the File Source (URL) filter:
hr = pGraph->RenderFile(L"http://example.microsoft.com/Example.avi", 0);
See Also