IDirectDrawSurface::Unlock
| Microsoft DirectShow 9.0 |
IDirectDrawSurface::Unlock
The Unlock method notifies DirectDraw that the surface manipulations are complete.
Syntax
ta
Parameters
lpSurfaceData
This is the pointer returned by Lock. Since it is possible to call Lock multiple times for the same Surface with different destination rectangles, this pointer is used to tie the Lock and Unlock calls together.
Return Values
| Value | Description |
| DD_OK | The method succeeded. |
| DDERR_INVALIDOBJECT | DirectDraw received a pointer that was an invalid DirectDraw object. |
| DDERR_INVALIDPARAMS | One or more of the input parameters is invalid. |
| DDERR_SURFACELOST | Access to this surface is being refused because the surface memory is gone. The DirectDrawSurface object representing this surface should have Restore called on it. |
| DDERR_NOTLOCKED | Surface was not locked. An attempt to unlock a surface that was not locked at all, or by this process, has been attempted. |
| DDERR_GENERIC | Generic failure. |
| DDERR_INVALIDRECT | Rectangle provided was invalid. |
See Also