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AutoCAD 2018 开发者帮助

CreateBackup 属性（ActiveX）

2024-5-18 16:54| 发布者: admin| 查看: 257| 评论: 0|原作者: admin|来自: AutoCAD

指定备份文件的使用。

支持的平台：仅限 Windows

签名

VBA：

object.CreateBackup

对象

类型：PreferencesOpenSave

此属性应用于的对象。

属性值

只读：不

类型：布尔

True：创建备份文件。
False：不会创建备份文件（即使对于完整保存也是如此）。

言论

此属性的初始值为。True

此属性通过创建备份文件（.bak）来提高增量保存的速度。操作系统复制文件数据以为大型图形创建备份文件，这需要大部分增量保存时间。

谨慎：如果出现问题（例如在保存过程中断电），图形数据可能会丢失。

注意：此属性的值存储在 ISAVEBAK 系统变量中。

例子

VBA：

Sub Example_CreateBackup()
    ' This example returns the current setting of
    ' CreateBackup. It then changes the value, and finally
    ' it resets the value back to the original setting.
    
    Dim preferences As AcadPreferences
    Dim currCreateBackup As Boolean
    
    Set preferences = ThisDrawing.Application.preferences
    
    ' Retrieve the current CreateBackup value
    currCreateBackup = preferences.OpenSave.CreateBackup
    MsgBox "The current value for CreateBackup is " & preferences.OpenSave.CreateBackup, vbInformation, "CreateBackup Example"
    
    ' Change the value for CreateBackup
    preferences.OpenSave.CreateBackup = Not (currCreateBackup)
    MsgBox "The new value for CreateBackup is " & preferences.OpenSave.CreateBackup, vbInformation, "CreateBackup Example"
    
    ' Reset CreateBackup to its original value
    preferences.OpenSave.CreateBackup = currCreateBackup
    MsgBox "The CreateBackup value is reset to " & preferences.OpenSave.CreateBackup, vbInformation, "CreateBackup Example"
End Sub

可视化 LISP：

(vl-load-com)
(defun c:Example_CreateBackup()
    ;; This example returns the current setting of
    ;; CreateBackup. 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 CreateBackup value
    (setq currCreateBackup (vla-get-CreateBackup (vla-get-OpenSave preferences)))
    (alert (strcat "The current value for CreateBackup is " (if (= currCreateBackup :vlax-true) "True" "False")))
    
    ;; Change the value for CreateBackup
    (setq newCreateBackup (if (= currCreateBackup :vlax-true) :vlax-false :vlax-true))
    (vla-put-CreateBackup (vla-get-OpenSave preferences) newCreateBackup)
    (alert (strcat "The new value for CreateBackup is " (if (= newCreateBackup :vlax-true) "True" "False")))
    
    ;; Reset CreateBackup to its original value
    (vla-put-CreateBackup (vla-get-OpenSave preferences) currCreateBackup)
    (alert (strcat "The CreateBackup value is reset to " (if (= currCreateBackup :vlax-true) "True" "False")))
)