开发手记（十）——在VB中解压缩ACCESS数据库文件
－为保证文章完整性，谢绝对某篇而非全部手记的转载（mi6236）
'压缩文件函数，dataS为源文件，dataz为目标文件，传出为一个布尔值
Private Function DataZip(ByVal Datas As String, ByVal Dataz As String) As Boolean
On Error GoTo Compact_Error
Dim JRO As JRO.JetEngine
Set JRO = New JRO.JetEngine
Dim fso As New FileSystemObject
If fso.FileExists(Dataz) = True Then
If MsgBox("此压缩文件已存在是否将其覆盖？", vbYesNo + vbQuestion, "压缩工程数据文件") = vbYes Then
Kill Dataz
Else
Exit Function
End If
End If
'压缩工程文件
JRO.CompactDatabase "Provider=Microsoft.Jet.OLEDB.4.0;Data Source=" & Datas, _
"Provider=Microsoft.Jet.OLEDB.4.0;Data Source=" & Dataz & ";Jet OLEDB:Engine Type=5"
DataZip = True
MsgBox "工程数据压缩成功！", vbInformation + vbOKOnly, "压缩数据文件"
Exit Function
Compact_Error:
DataZip = False
If Err.Number = -2147467259 Then
MsgBox "数据压缩失败!(可能你的数据库正被其他程序使用，请将重新运行系统！)", vbOKOnly + vbInformation, "错误"
Exit Function
End If
dbEncrypt.SaveError "MDIForm1-DataZip"
End Function
'解压缩函数，datas未压缩文件，dataz为已压缩文件
Private Function Zipext(ByVal Dataz As String, ByVal Datas As String) As Boolean
On Error GoTo Compact_Error
Dim JRO As JRO.JetEngine
Set JRO = New JRO.JetEngine
Dim fso As New FileSystemObject
If fso.FileExists(Datas) = True Then
If MsgBox("此工程文件已存在是否将其覆盖？", vbYesNo + vbQuestion, "解压缩工程数据文件") = vbYes Then
Kill Datas
Else
Exit Function
End If
End If
'解压缩工程文件
JRO.CompactDatabase "Provider=Microsoft.Jet.OLEDB.4.0;Data Source=" & Dataz, _
"Provider=Microsoft.Jet.OLEDB.4.0;Data Source=" & Datas & ";Jet OLEDB:Engine Type=5"
Zipext = True
MsgBox "工程数据解压缩成功！", vbOKOnly + vbInformation, "解压缩数据文件"
Exit Function
Compact_Error:
Zipext = False
If Err.Number = -2147467259 Then
MsgBox "数据压缩失败!(可能你的数据库正被其他程序使用，请将重新运行系统！)", vbOKOnly + vbInformation, "错误"
Exit Function
End If
dbEncrypt.SaveError "MDIForm1-DataZip"
End Function