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tstr

lpctstr

lptstr

FLI type descriptors
Summary

Types which automatically switch between ANSI and Unicode strings.

Package

win32

Signature

tstr &key length

lpctstr &key max-length

lptstr &key max-length

Description

tstr is an ANSI/Unicode string.

lpctstr is a reference-pass pointer to ANSI/Unicode string.

lptstr is a reference (in/out) pointer to an ANSI/Unicode string.

Each of these three types automatically switch between ANSI and Unicode, which makes them ideal for use with the :dbcs encoding option in fli:define-foreign-function.

Example

This calls GetDriveTypeA on Windows ME, and GetDriveTypeW on supported versions of Windows.

The argument is passed as ANSI or Unicode respectively:

(fli:define-foreign-function (%get-drive-type "GetDriveType" :dbcs)
    ((lpRootPathName W:LPCTSTR))
    :result-type (:unsigned :int))
 
(defconstant +drive-types+
   #(:unknown :none :removable :fixed :remote :cdrom :ramdisk))
 
(defun get-drive-information (drive)
  (the drive-type (svref +drive-types+ (%get-drive-type drive))))

LispWorks User Guide and Reference Manual - 20 Sep 2017

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