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XRefDemandLoad 属性（ActiveX）

2024-5-18 18:58| 发布者: admin| 查看: 255| 评论: 0|原作者: admin|来自: AutoCAD

指定外部参照的按需加载。

支持的平台：仅限 Windows

签名

VBA：

object.XRefDemandLoad

对象

类型：PreferencesOpenSave

此属性应用于的对象。

属性值

只读：不

类型：枚举acXRefDemandLoad

acDemandLoadDisabled：关闭需求加载;整个图形已加载。
acDemandLoadEnabled：打开按需加载并提高 AutoCAD 性能。其他用户在引用文件时无法编辑该文件。
acDemandLoadEnabledWithCopy：打开按需加载，但使用参照图形的副本。其他用户可以编辑原始图形。

言论

按需加载通过仅加载重新生成当前图形所需的参照图形的零件来提高性能。

此属性的初始值为。acDemandLoadEnabled

注意：此属性的值存储在 XLOADCTL 系统变量中。

例子

VBA：

Sub Example_XRefDemandLoad()
    ' This example returns the current setting of
    ' XRefDemandLoad. It then changes the value, and finally
    ' it resets the value back to the original setting.
    
    Dim preferences As AcadPreferences
    Dim currXRefDemandLoad As Integer
    Dim constant As String
    Dim newConstant As String
    
    Set preferences = ThisDrawing.Application.preferences
    
    ' Retrieve the current XRefDemandLoad value
    currXRefDemandLoad = preferences.OpenSave.XrefDemandLoad
    constant = Choose(currXRefDemandLoad + 1, "acDemandLoadDisabled", "acDemandLoadEnabled", "acDemandLoadEnabledWithCopy")
    MsgBox "The current value for XRefDemandLoad is " & constant, vbInformation, "XRefDemandLoad Example"
    
    ' Change the value for XRefDemandLoad
    newConstant = "acDemandLoadEnabledWithCopy"
    preferences.OpenSave.XrefDemandLoad = acDemandLoadEnabledWithCopy
    MsgBox "The new value for XRefDemandLoad is " & newConstant, vbInformation, "XRefDemandLoad Example"
    
    ' Reset XRefDemandLoad to its original value
    preferences.OpenSave.XrefDemandLoad = currXRefDemandLoad
    MsgBox "The XRefDemandLoad value is reset to " & constant, vbInformation, "XRefDemandLoad Example"
End Sub

可视化 LISP：

(vl-load-com)
(defun c:Example_XRefDemandLoad()
    ;; This example returns the current setting of
    ;; XRefDemandLoad. It then changes the value, and finally
    ;; it resets the value back to the original setting.
    (setq acadObj (vlax-get-acad-object))
    (setq preferences (vla-get-Preferences acadObj))
    
    ;; Retrieve the current XRefDemandLoad value
    (setq currXRefDemandLoad (vla-get-XrefDemandLoad (vla-get-OpenSave preferences)))
    (setq constant (cond
                       ((= currXRefDemandLoad acDemandLoadDisabled) "acDemandLoadDisabled")
                       ((= currXRefDemandLoad acDemandLoadEnabled) "acDemandLoadEnabled")
                       ((= currXRefDemandLoad acDemandLoadEnabledWithCopy) "acDemandLoadEnabledWithCopy")
                   ))
    (alert (strcat "The current value for XRefDemandLoad is " constant))
    
    ;; Change the value for XRefDemandLoad
    (setq newConstant "acDemandLoadDisabled")
    (vla-put-XrefDemandLoad (vla-get-OpenSave preferences) acDemandLoadDisabled)
    (alert (strcat "The new value for XRefDemandLoad is " newConstant))
    
    ;; Reset XRefDemandLoad to its original value
    (vla-put-XrefDemandLoad (vla-get-OpenSave preferences) currXRefDemandLoad)
    (alert (strcat "The XRefDemandLoad value is reset to " constant))
)