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    ReadPort

    Read data from a PC port.

    Declaration

    Source position: x86.pp line 33

    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.
    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.