ReadPort

Read data from a PC port

Declaration

Source position: x86.pp line 28

  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

Name	Description
FpIOPerm	Set permission on IO ports
ReadPortB	Read bytes from a PC port
ReadPortL	Read longints from a PC port
ReadPortW	Read Words 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