READ_PORT_BUFFER_UCHAR function (wdm.h)

The READ_PORT_BUFFER_UCHAR routine reads a number of bytes from the specified port address into a buffer.

Syntax

NTHALAPI VOID READ_PORT_BUFFER_UCHAR(
  [in]  PUCHAR Port,
  [out] PUCHAR Buffer,
  [in]  ULONG  Count
);

Parameters

[in] Port

Specifies the port address, which must be a mapped memory range in I/O space.

[out] Buffer

Pointer to a buffer into which an array of UCHAR values is read.

[in] Count

Specifies the number of bytes to be read into the buffer.

Return value

None

Remarks

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

Callers of READ_PORT_BUFFER_UCHAR can be running at any IRQL, assuming the Buffer is resident and the Port is resident, mapped device memory.

Requirements