READ_PORT_UCHAR function (wdm.h)

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

Syntax

NTHALAPI UCHAR READ_PORT_UCHAR(
  [in] PUCHAR Port
);

[in] Port

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

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

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

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