NtGdiDdUnlock function

[This function is subject to change with each operating system revision. Instead, use the Microsoft DirectDraw and Microsoft Direct3DAPIs; these APIs insulate applications from such operating system changes, and hide many other difficulties involved in interacting directly with display drivers.]

Releases the lock held on the specified surface.

Syntax

DWORD APIENTRY NtGdiDdUnlock(
  _In_    HANDLE         hSurface,
  _Inout_ PDD_UNLOCKDATA puUnlockData
);

Parameters

hSurface [in]

Handle to a DD_SURFACE_LOCAL structure that describes the surface to be unlocked.

puUnlockData [in, out]

Pointer to a DD_UNLOCKDATA structure that contains the information required to perform the lock release.

Return value

NtGdiDdUnlock returns one of the following callback codes.

Return code Description
DDHAL_DRIVER_HANDLED
The driver has performed the operation and returned a valid return code for that operation. If this code is DD_OK, DirectDraw or Direct3D proceeds with the function. Otherwise, DirectDraw or Direct3D returns the error code provided by the driver and aborts the function.
DDHAL_DRIVER_NOTHANDLED
The driver has no comment on the requested operation. If the driver is required to have implemented a particular callback, DirectDraw or Direct3D reports an error condition. Otherwise, DirectDraw or Direct3D handles the operation as if the driver callback had not been defined by executing the DirectDraw or Direct3D device-independent implementation.

 

Requirements

Requirement Value
Minimum supported client
Windows 2000 Professional [desktop apps only]
Minimum supported server
Windows 2000 Server [desktop apps only]
Header
Ntgdi.h

See also

Graphics Low Level Client Support