NtGdiDdWaitForVerticalBlank 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.]
Returns the vertical blank status of the device.
Syntax
DWORD APIENTRY NtGdiDdWaitForVerticalBlank(
_In_ HANDLE hDirectDraw,
_Inout_ PDD_WAITFORVERTICALBLANKDATA puWaitForVerticalBlankData
);
Parameters
-
hDirectDraw [in]
-
Handle to previously created kernel-mode DirectDraw object.
-
puWaitForVerticalBlankData [in, out]
-
Pointer to a DD_WAITFORVERTICALBLANKDATA structure that contains the information required to obtain the vertical blank status.
Return value
NtGdiDdWaitForVerticalBlank returns one of the following callback codes.
| Return code | Description |
|---|---|
|
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. |
Requirements
| Requirement | Value |
|---|---|
| Minimum supported client |
Windows 2000 Professional [desktop apps only] |
| Minimum supported server |
Windows 2000 Server [desktop apps only] |
| Header |
|
See also