common-lisp - 错误:无法读取服务器:远程使用 ltk 时没有这样的变量
问题描述
我正在修补ltk,因为它提供了运行远程 GUI 的选项。但是,当尝试使用远程 GUI 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)))
运行时(create-local-view)
一切正常,并且入口小部件的内容随机变化。
运行时(create-remote-view)
我收到错误消息can't read server: no such variable
。为什么会发生此错误,我该如何解决?
我正在使用remote.tcl
由 quicklisp 部署的:
#!/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}}
解决方案
所以我花了一些时间阅读和测试代码,它似乎remote-client.tcl
比remote.tcl
. 使用 时ltk-remote.lisp
,Lisp 端创建一个可以接受多个客户端的服务器,每个客户端都是一个 tcl/tk 解释器。
lisp <=== socket stream ===> [ server socket ]
^
|
(wish interpreter)
lisp 端期望解释器维护一个名为server
. 在本地解释器的情况下,这是在 中完成的init-wish
,那里有set server stdout
。在远程愿望的情况下,希望解释器自己设置这个变量。
情况就是这样remote-client.tcl
,测试应用程序运行良好(例如ltk-remote::lrtest
),除了它添加了一个.status
永远不会删除的小部件。应该可以清理一下remote-client.tcl
脚本。
在 的情况下remote.tcl
,解释器打开一对流到另一个wish
进程:
set wi [open "|wish" RDWR]
它还连接到服务器(变量server
),并将输入从服务器复制到愿望过程。不幸的是,嵌入式愿望过程没有定义server
变量:
lisp <=== socket stream ===> [ server socket ]
^
|
(wish interpreter 1)
"server" variable
|
"wi" variable
^
| pipe connection
v
(wish interpreter 2)
no "server" variable
但是,如果您设置server
为stdout
,如另一个答案中所述,则此分配将在第二个愿望解释器中进行评估。输出被发送回第一个愿望解释器,它将答案复制回 lisp 服务器。
我没有通过另一个愿望解释器,而是使用remote-client.tcl
不添加任何小部件的修改器在本地进行测试:
package require Tk
set host localhost
set port 19790
set server ""
if {[llength $argv] > 0} {
set host [lindex $argv 0]
}
if {[llength $argv] > 1} {
set port [lindex $argv 1]
}
if {[catch {global server; global host; global port; set server [socket $host $port]}]} {
tk_messageBox -icon error -type ok -title "Connection failed!" -message "Cannot connect to server $host port $port."
exit
}
fconfigure $server -blocking 0 -translation binary -encoding utf-8
fileevent $server readable [list sread $server]
set buffer ""
proc getcount {s} {
if {[regexp {^\s*(\d+) } $s match num]} {
return $num
}
}
proc getstring {s} {
if {[regexp {^\s*(\d+) } $s match]} {
return [string range $s [string length $match] end]
}
}
proc process_buffer {} {
global buffer
global server
set count [getcount $buffer]
set tmp_buf [getstring $buffer]
while {($count > 0) && ([string length $tmp_buf] >= $count)} {
set cmd [string range $tmp_buf 0 $count]
set buffer [string range $tmp_buf [expr $count+1] end]
if {[catch $cmd result]>0} {
tk_messageBox -icon error -type ok -title "Error!" -message $result
puts $server "(error: \"$result\")"
flush $server
close $server
exit
}
set count [getcount $buffer]
set tmp_buf [getstring $buffer]
}
}
proc sread {server} {
global buffer
if {[eof $server]} {
tk_messageBox -icon info -type ok -title "Connection closed" -message "The connection has been closed by the server."
close $server
exit
} else {
set txt [read $server];
set buffer "$buffer$txt"
process_buffer
}
}
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