Nebula2探秘07-使用Tcl脚本服务II

    Nebula2的程序与脚本联系的纽带是NOH，NOH是Nebula2的程序和脚本可以共同访问的数据结构，因此我们可以通过在脚本中访问NOH来实现与程序的交互。

    下面用代码来说明这个交互过程：

    下面是创建tcl-server的代码（与上一节相同），"/sys/servers/script"是Nebula2脚本服务在NOH中的固定路径，不能改变：

    下面一段代码调用了"T07_UsingTclServerII.tcl"脚本程序：

    "T07_UsingTclServerII.tcl"的内容如下：

#-------------------------------------------------------------------------------
#    T07 UsingTclServer II - 在Tcl脚本中调用KernelServer对象    
#    @by happykevins
#-------------------------------------------------------------------------------
puts "*****Begin Script File!*****"
puts "*****Create nkernelinfohelper*****"

new nkernelinfohelper /sys/servers/ks_info

sel /sys/servers/ks_info
    puts "*****Invoke logcls cmd*****"
    .logcls
    puts "*****Invoke lognoh cmd*****"
    .lognoh    "/"
    
puts "*****End Script File!*****"

    这段tcl脚本首先使用new语句在NOH中的"/sys/servers/ks_info"位置创建了一个nkernelinfohelper 的对象,然后通过sel语句将其设置成当前工作对象，接着调用了logcls和lognoh方法。

    下面给出Nebula2文档中列出的一些Tcl的简单语法：

Common Commands (Nebula2Docs@nTclServer)
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new classname path
Create a new object of the specified class at the specified path in the NOH. Returns true on success and nil on failure.

example:
new 'ntransformnode' 'tm'
new 'nd3d9server' '/sys/servers/gfx'
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delete path
Delete the NOH object at the specified location in the NOH. Returns true on success and nil on failure.

example:
delete '/usr/scene/myobject'
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sel path
Set the current working directory of the NOH to the specified path. Returns true on success and nil on failure.

example:
sel '/sys/servers/gfx'
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psel
Returns the full path of the currently selected object.
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exit
Exit Nebula. Exit does not return a value.
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puts string
Echo the provided string to the Kernel server's log handler chain.(only on Micro TCL)

example:
puts 'fish <)))<'<br>
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dir
Return a table containing the names of the children of the current working directory in the NOH.
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exists path
RCheck whether object exists. Return "1" if yes, return "0" if no.
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emit object.signal arg1 arg2 arg3
Implement signal emission (emit command).
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post time object.signal arg1 arg2 arg3
Post signal and commands (post command).

    Nebula2还另外提供了luaserver，pythonserver等脚本服务器，创建过程和使用方法与tclserver差不多；关于Nebula2的Tcl及脚本服务的使用方法就介绍到这儿，你现在应该已经掌握了其基本用法，是不是觉得很容易：)