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SysVarChanged 事件（ActiveX）

2024-5-18 16:55| 发布者: admin| 查看: 105| 评论: 0|原作者: admin|来自: AutoCAD

在系统变量的值发生更改时触发。

支持的平台：仅限 Windows

签名

VBA：

object.SysVarChanged(SysVarName, NewVal)

对象

类型： 应用

计算结果为有效容器对象的对象表达式。在这种情况下，唯一有效的容器是应用程序。

SysVarName

类型：字符串;输入到处理程序

其值已更改的系统变量的名称。

纽瓦尔

类型：变体;输入到处理程序

系统变量的新值。

言论

此事件表示尝试更改系统变量。它不表示实际值已更改。在某些情况下，可以设置系统变量而不导致其值更改。例如，如果 FILLMODE 为 0，并且有人尝试将其设置为 0，则即使调用对 FILLMODE 的值没有实际影响，您也会得到该系统变量的事件。

显示模式对话框时不会触发任何事件。

例子

VBA：

Public WithEvents ACADApp As AcadApplication    ' Use with Application Event Examples
Sub Example_AcadApplication_Events()
    ' This example intializes the public variable (ACADApp) which will be used
    ' to intercept AcadApplication Events
    '
    ' The VBA WithEvents statement makes it possible to intercept an generic object
    ' with the events associated with that object.
    '
    ' Before you will be able to trigger any of the AcadApplication events,
    ' you will first need to run this procedure.
    
    ' We could get the application from the ThisDocument object, but that would
    ' require having a drawing open, so we grab it from the system.
    Set ACADApp = GetObject(, "AutoCAD.Application.22")
End Sub

Private Sub ACADApp_SysVarChanged(ByVal SysvarName As String, ByVal newVal As Variant)
    ' This example intercepts an Application SysVarChanged event.
    '
    ' This event is triggered when the value of a system variable is changed.
    '
    ' To trigger this example event:
    '     1) Make sure to run the example that initializes
    '     the public variable (named ACADApp) linked to this event.
    '
    '     2) Change the value of a system variable in AutoCAD.
    '     For example: Type GRIDMODE on the command line and toggle the grid display on/off

    ' Use the "SysvarName" and "newVal" variables to determine which
    ' system variable has changed and its new value.
    MsgBox "The system variable " & SysvarName & " was just changed to: " & newVal
End Sub

可视化 LISP：