VideoPortZeroMemory function (video.h)
The VideoPortZeroMemory function fills a block of system memory with zeros.
Syntax
VIDEOPORT_API VOID VideoPortZeroMemory(
[out] PVOID Destination,
ULONG Length
);
Parameters
[out] Destination
Specifies the starting address of the block of memory. This value must be in a mapped logical range returned by VideoPortGetDeviceBase.
Length
Specifies the size, in bytes, of the block.
Return value
None
Remarks
Miniport drivers' DriverEntry functions generally call VideoPortZeroMemory to initialize the VIDEO_HW_INITIALIZATION_DATA structure with zeros.
The given Destination must be in a mapped logical range returned by VideoPortGetDeviceBase and/or a system space RAM address, such as an address on the stack. Use VideoPortZeroDeviceMemory to fill any device-memory block, such as a frame buffer, with zeros.
A miniport driver's HwVidInterrupt or HwVidSynchronizeExecutionCallback function can call VideoPortZeroMemory.
Callers of VideoPortZeroMemory can be running at any IRQL if the memory pointed to by the Destination parameter is in nonpaged pool. Otherwise, the caller must be running at IRQL < DISPATCH_LEVEL.
Requirements
| Requirement | Value |
|---|---|
| Minimum supported client | Available in Windows 2000 and later versions of the Windows operating systems. |
| Target Platform | Desktop |
| Header | video.h (include Video.h) |
| Library | Videoprt.lib |
| DLL | Videoprt.sys |
| IRQL | See Remarks section. |