错误：无法读取服务器：远程使用ltk时没有这样的变量 [英] Error: can't read server: no such variable when using ltk remotely

问题描述

我正在修改ltk，因为它提供了运行远程图形用户界面的选项。但是，在尝试使用远程图形用户界面时，我遇到了在本地运行ltk时没有遇到的问题：

(in-package :ltk-user)


(defun add-current-investigation-frame (master)
  (let* ((frame (make-instance 'frame :master master :width 100 :height 100))
         (topic-label (make-instance 'label :text "Current Investigation" :master frame))
         (project-label (make-instance 'entry :text "N/A" :master frame))
         (action-button (make-instance 'button
                                       :master frame
                                       :text "new investigation")))
    (setf (command action-button) (lambda ()
                                    (format t "test~%")
                                    (let ((next-project (nth (random 3) '("A" "B" "N/A"))))
                                      (setf (text project-label) next-project))))
    (pack frame)
    (pack topic-label :side :top)
    (pack project-label :side :top)
    (pack action-button :side :top)))



(defun create-main-view ()
  (let ((wrapper-frame (make-instance 'frame :master nil)))
    (pack wrapper-frame)
    (add-current-investigation-frame wrapper-frame)))


(defun create-remote-view (&optional (port 8888))
  (Ltk:with-remote-ltk port ()
                       (create-main-view)))


(defun create-local-view ()
  (with-ltk ()
    (create-main-view)))

运行(create-local-view)时，一切正常，Entry小工具的内容随机更改。

运行(create-remote-view)时，收到错误消息can't read server: no such variable。发生此错误的原因以及如何修复此错误？

我使用的是由Quicklisp部署的remote.tcl：

#!/usr/bin/wish

#    This library is free software; you can redistribute it and/or
#    modify it under the terms of the GNU Lesser General Public
#    License as published by the Free Software Foundation; either
#    version 2.1 of the License, or (at your option) any later version.
#
#    This library is distributed in the hope that it will be useful,
#    but WITHOUT ANY WARRANTY; without even the implied warranty of
#    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
#    Lesser General Public License for more details.

#    You should have received a copy of the GNU Lesser General Public
#    License along with this library; if not, write to the Free Software
#    Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA


wm withdraw .
set host localhost
if {[llength $argv] == 2} {
    set host [lindex $argv 0]
    set port [lindex $argv 1]} else {
        set port [lindex $argv 0]}
#puts "connecting to $host $port"

set server [socket $host $port]
set wi [open "|wish" RDWR]
fconfigure $server -blocking 0
fconfigure $wi -blocking 0


fileevent $server readable {set txt [read $server];puts $wi "$txt";flush $wi}
fileevent $wi readable {
    if {[eof $wi]} {
        close $wi
        exit} else {        
            set txt [read $wi]; puts -nonewline $server $txt;flush $server}}

推荐答案

这是一个初步答案，因为我不能完全确定此修复程序是否不会破坏任何东西。我将在将来更新此答案，以报告遇到的问题。但就目前而言，这解决了问题。

在ltk.lisp中有一个名为init-wish的函数，它需要额外的行(send-wish "set server stdout")

(defun init-wish ()
 (send-lazy
  ;; print string readable, escaping all " and 
  ;; proc esc {s} {puts ""[regsub {"} [regsub {\} $s {\\}] {"}]""}
  ;(send-wish "proc esc {s} {puts "\"[regsub -all {"} [regsub -all {\\} $s {\\\\}] {\"}]\""} ")
  ;(send-wish "proc escape {s} {return [regsub -all {"} [regsub -all {\\} $s {\\\\}] {\"}]} ")
   (send-wish "package require Tk")
;;; PUT MISSING LINE HERE
   (send-wish "set server stdout")
;;; PUT MISSING LINE HERE
  (flush-wish)

  #+:tk84
  (send-wish "catch {package require Ttk}")
  #-:tk84
  (send-wish "if {[catch {package require Ttk} err]} {tk_messageBox -icon error -type ok -message "$err"}")


  (send-wish "proc debug { msg } {
       global server
       puts $server "(:debug \"[escape $msg]\")"
       flush $server
    } ")
; more code ....
))

说明：该功能似乎设置了愿望界面和动作(在remote.tcl中插入打印确认)。然而，正如我们所看到的，server在所有过程中都被引用，但是如果我们认为所有这些声明都在它们自己的命名空间中，那么它永远不会被声明。因此，必须定义缺失的服务器。由于所有输出都由fileevent $wi ...读取，然后进一步传递，因此将server定义为stdout似乎是最明智的。

它似乎起作用了，但我不知道这是否会损坏其他东西

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