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

ReadPort

Read data from a PC port

Declaration

Source position: x86.pp line 25

procedure ReadPort(

  Port: LongInt;

  var Value: Byte

);

procedure ReadPort(

  Port: LongInt;

  var Value: LongInt

);

procedure ReadPort(

  Port: LongInt;

  var Value: Word

);

Description

ReadPort reads one Byte, Word or Longint from port Port into Value.

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

ReadPortB

  

Read bytes 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: Nov 16 2015