本文介绍了在SWI Prolog中使用process_create / 3使用命令提示符或shell时出错的处理方法,对大家解决问题具有一定的参考价值,需要的朋友们下面随着小编来一起学习吧!

问题描述

在Windows 7中,当我在SWI Prolog中使用process_create / 3打开Notepad.exe等应用程序时,记事本打开。但是,它不适用于使用命令提示符的应用程序。例如,当我试图打开命令提示符窗口,使用:

  main: -  process_create('C:\ \WINDOWS\\system32\\cmd.exe',[],[])。 

它提供

 错误:处理c:\windows\system32\cmd.exe:退出状态:1 

同样,当尝试打开powershell.exe时,它也不工作。

解决方案



任何帮助都非常感谢。 / div>

要启动单独的控制台窗口:

 ? -  process_create(path(cmd),['/ c ','start','cmd'],[])。 

或更短(但我不知道这是怎么移植的):

 ? -  process_create(path(cmd),['/ c','start'],[])。 

或者这样(从SWI-Prolog源代码获取的想法):

 ? -  getenv('COMSPEC',CMD),process_create(CMD,['/ c','start'],[])。 

要启动具有3个参数的外部BAT命令:

 ? -  process_create(
path(cmd),
['/ c','start','cmd','/ c' c:\\test\\test.bat','arg1','arg2','arg3'],
[])。

重要说明:理论上,您可以将所有这些参数作为一个字符串,例如。 '/ c start cmd ...'而不是字符串列表,但奇怪的事情可能发生在更复杂的情况下。在我的例子中,SWI-Prolog 7.2.3在结尾添加了单引号或单双引号,因此传递给批处理脚本的最后一个参数不是 arg3 ,而是 arg3' arg3


On Windows 7, when I used process_create/3 in SWI Prolog to open an application like Notepad.exe, the notepad opens. However, it doesn't work for applications that use command prompt. As an example, when I tried to open the command prompt window, using:

main :- process_create('C:\\WINDOWS\\system32\\cmd.exe',[] ,[]).

which gives an

ERROR: Process "c:\windows\system32\cmd.exe": exit status: 1

Similarly, when trying it to open powershell.exe, it doesn't work either. the console just hangs, without displaying an error.

Any help is greatly appreciated.

解决方案

To start a separate console window:

?- process_create(path(cmd), ['/c', 'start', 'cmd'], []).

Or even shorter (but I don't know how portable this is):

?- process_create(path(cmd), ['/c', 'start'], []).

Or this way (idea taken from SWI-Prolog source code):

?- getenv('COMSPEC', CMD), process_create(CMD, ['/c', 'start'], []).

To start an external BAT command with 3 arguments:

?- process_create(
    path(cmd), 
    ['/c', 'start', 'cmd', '/c', 'c:\\test\\test.bat', 'arg1', 'arg2', 'arg3'],
    []).

Important note: theoretically you could pass all this arguments as one string, eg. '/c start cmd ...' instead of list of strings but strange things may happen in more sophisticated cases. In my case SWI-Prolog 7.2.3 added single quote or single double quote at the end, so the last argument passed to batch script was not arg3 but arg3' or arg3".

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10-21 13:08