VideoPortReadPortBufferUchar function

The VideoPortReadPortBufferUchar function reads a number of bytes from a mapped I/O port and writes them into a buffer.

Syntax

VIDEOPORT_API VOID VideoPortReadPortBufferUchar(
  PUCHAR Port,
  PUCHAR Buffer,
  ULONG  Count
);

Parameters

Port

Pointer to the I/O port. The given Port must be in a mapped I/O-space range returned by VideoPortGetDeviceBase.

Buffer

Pointer to a buffer into which the UCHAR values are written.

Count

Specifies the number of bytes to be written to the buffer.

Return Value

None

Remarks

The buffer must be large enough to contain at least the specified number of bytes.

A miniport driver's HwVidInterrupt or HwVidSynchronizeExecutionCallback function can call VideoPortReadPortBufferUchar.

Callers of VideoPortReadPortBufferUchar can be running at any IRQL, provided that the memory pointed to by the Buffer parameter is resident and that pointed to by the Port parameter is resident, mapped device memory.

Requirements

   
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.

See Also

HwVidInterrupt

HwVidSynchronizeExecutionCallback

VideoPortGetDeviceBase