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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