[Overview][Procedures and functions][Index] | Reference for unit 'x86' (#rtl)

# ReadPortW

Read Words from a PC port

## Declaration

Source position: x86.pp line 25

`function ReadPortW(`
`Port: LongInt`
`):Word; procedure ReadPortW(`
`Port: LongInt;`
`var Buf;`
`Count: LongInt`
`);`

## Description

The procedural form of ReadPortW reads Count words from port Port and stores them in Buf. There must be enough memory allocated at Buf to store Count words.

The functional form of ReadPortW reads 1 word from port B and returns the word that was read.

Note that you need permission to read a port. This permission can be set by the root user with the FpIOPerm call.

## Errors

In case of an error (not enough permissions read this port), runtime 216 ( Access Violation) will occur.

## See also

FpIOPerm |  | Set permission on IO ports
ReadPort |  | Read data from a PC port
ReadPortB |  | Read bytes from a PC port
ReadPortL |  | Read longints from a PC port
WritePort |  | Write data to PC port
WritePortB |  | Write byte to PC port
WritePortL |  | Write longint to PC port.
WritePortW |  | Write Word to PC port

Documentation generated on: May 14 2021