ExpireDate 属性
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小牛编辑
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2023-12-01
返回一个 Variant 类型,表示对应于 Signature 对象的数字签名的过期日期。只读。
expression.ExpireDate
expression 必需。该表达式返回“应用于”列表中的对象之一。
示例
本示例提示用户选择 Microsoft Word 中活动文档的数字签名。要使用本示例,请在 Word 中打开文档并调用该函数。该函数将进行测试以确保用户所选择的数字签名在 12 个月内不会过期。如果将会过期,则不附加证书。
Function AddSignature() As Boolean
On Error GoTo Error_Handler
Dim sig As Signature
'Display the dialog box that lets the
'user select a digital signature.
'If the user selects a signature, then
'it is added to the Signatures
'collection. If the user doesn't, then
'an error is returned.
Set sig = ActiveDocument.Signatures.Add
'Test to make sure that the new Signature object
'doesn't expire too soon. This expression calculates
'the number of months until the Signature object expires.
If DateDiff("m", sig.SignDate, sig.ExpireDate) < 12 Then
MsgBox "This Certificate will expire in less than 1 year." & vbCrLf & _
"Please use a newer certificate."
AddSignature = False
sig.Delete
Else
AddSignature = True
End If
'Commit all signatures in the SignatureSet collection to the disk.
ActiveDocument.Signatures.Commit
Exit Function
Error_Handler:
AddSignature = False
MsgBox "Action cancelled."
End Function