 Important: |
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This method passes the IDirectDrawinterface to a loaded driver.
Syntax
HRESULT SetDirectDraw( LPDIRECTDRAW pDirectDraw ); |
Parameters
- pDirectDraw
-
IDirectDrawinterface to be passed.
Return Value
Returns an HRESULTvalue.
Remarks
To have the renderer release a DirectDraw interface previously passed in through SetDirectDraw, an application can call SetDirectDrawand pass in NULL. However, the renderer continues using that DirectDraw interface until it is disconnected.
Therefore, calling SetDirectDrawwith a null parameter does not make the renderer stop using it immediately.
This method was created because only one instance of IDirectDrawcould be loaded per process in DirectDraw 1.0.
If an application wanted to load IDirectDrawbut allow the renderer to also allocate surfaces, the application could open IDirectDrawand then pass the interface to the loaded driver through IDirectDrawVideo::SetDirectDraw.
Alternatively, the application could let the renderer load DirectDraw and then obtain a reference-incremented interface to it through IDirectDrawVideo::GetDirectDraw.
Because DirectShow ships with the most recently shipped version of DirectDraw, this method is not required unless the application wants to change display modes itself and pass in a DirectDraw object, which the renderer can then use to allocate surfaces.
Requirements
| Windows Embedded CE | Windows CE 2.12 and later |
| Windows Mobile | Pocket PC for Windows Mobile Version 5.0 and later, Smartphone for Windows Mobile Version 5.0 and later |
| Note | Microsoft DirectShow applications and DirectShow filters have
different include file and Library requirements
For more information, see Setting Up the Build Environment,Version 2.12 requires DXPAK 1.0 or later |