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

ReadPortB

Read bytes from a PC port

Declaration

Source position: x86.pp line 24

function ReadPortB(

  Port: LongInt

):Byte;

procedure ReadPortB(

  Port: LongInt;

  var Buf;

  Count: LongInt

);

Description

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

The functional form of ReadPortB reads 1 byte from port B and returns the byte 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

ReadPortW

  

Read Words 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: Jun 23 2021