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READ_PORT_UCHAR function (ioaccess.h)

  • Article

The READ_PORT_UCHAR routine reads a byte from the specified port address.

Syntax

UCHAR READ_PORT_UCHAR(
  [in] PVOID Port
);

Parameters

[in] Port

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

Return value

READ_PORT_UCHAR returns the byte that is read from the specified port address.

Remarks

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

Requirements

Requirement Value
Minimum supported client Available starting with Windows 2000.
Target Platform Universal
Header ioaccess.h (include Wdm.h, Ntddk.h, Ntifs.h, Ioaccess.h, Miniport.h)
Library Hal.lib
IRQL Any level (see Remarks section)