NtGdiDdLock 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.]

Locks a specified area of surface memory and provides a valid pointer to a block of memory associated with a surface.

Syntax

DWORD APIENTRY NtGdiDdLock(
  _In_    HANDLE       hSurface,
  _Inout_ PDD_LOCKDATA puLockData,
  _In_    HDC          hdcClip
);

Parameters

hSurface [in]

Handle to a DD_SURFACE_LOCAL structure that describes the surface associated with the memory region to be locked down.

puLockData [in, out]

Pointer to a DD_LOCKDATA structure that contains the information required to perform the lockdown.

hdcClip [in]

Reserved.

Return value

NtGdiDdLock 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