NtGdiDdGetAvailDriverMemory 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.]

Queries the amount of free memory in all video memory heaps.


DWORD APIENTRY NtGdiDdGetAvailDriverMemory(
  _In_    HANDLE                       hDirectDraw,


hDirectDraw [in]

Handle to previously created kernel-mode DirectDraw object.

puGetAvailDriverMemoryData [in, out]

Pointer to a DD_GETAVAILDRIVERMEMORYDATA structure that contains the information required to perform the query.

Return value

NtGdiDdGetAvailDriverMemory returns one of the following callback codes.

Return codeDescription

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.


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.



Minimum supported client

Windows 2000 Professional [desktop apps only]

Minimum supported server

Windows 2000 Server [desktop apps only]



See also

Graphics Low Level Client Support