WRITE_PORT_BUFFER_UCHAR function (wdm.h)

Article
02/22/2024

The WRITE_PORT_BUFFER_UCHAR routine writes a number of bytes from a buffer to the specified port.

Syntax

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

Parameters

[in] Port

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

[in] Buffer

Pointer to a buffer from which an array of UCHAR values is to be written.

[in] Count

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

Return value

None

Remarks

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

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

Requirements

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

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