请版主及大侠们看一下这段代码,是关于mdb文件创建、压缩、修改密码的,运行后创建和压缩成功，修改密码失败，请看一下问题出在什么地方，谢谢
以下代码是从梅子论坛下载的，直接复制在prg文件里即可运行，会在C盘创建一个MDB文件，前两个函数运行都没问题，第3个函数“单独修改数据库密码时出错”，本人实在是看不懂，
无从下手，请大侠们看一下错在哪，谢谢。
* --------------------------------------------
* 程序: 创建、压缩Access数据库并修改密码演示
* 设计: 红雨
* --------------------------------------------
Local lcMdbFile, lcRetuStr
lcMdbFile = [C:\\TestCreaMdbFile.mdb]
lcPswd1 = [test1]
lcPswd2 = [test2]
lcPswd3 = [test3]
lcRetuStr = [创建、压缩Access数据库并修改密码演示：] + Chr(13)
If CreateMDB( lcMdbFile, lcPswd1)
lcRetuStr = lcRetuStr + Chr(13) + [1、创建数据库成功 - 密码: ] + lcPswd1
If CompactMDB( lcMdbFile, lcPswd1, lcPswd2 )
lcRetuStr = lcRetuStr + Chr(13) + [2、压缩并修改密码成功 - 密码: ] + lcPswd2
If ChangeMdbPassword( lcMdbFile, lcPswd2, lcPswd3 )
lcRetuStr = lcRetuStr + Chr(13) + [3、单独修改数据库密码成功 - 密码: ] + lcPswd3
Else
lcRetuStr = lcRetuStr + Chr(13) + [3、单独修改数据库密码失败]
Endif
Else
lcRetuStr = lcRetuStr + Chr(13) + [2、压缩并修改密码失败]
Endif
Else
lcRetuStr = lcRetuStr + Chr(13) + [1、创建数据库失败]
Endif
= MessageBox( lcRetuStr, 0+64+0, [红雨提示] )
Return
* --------------------------------------------
Function CreateMDB( tcMdbFile, tcPswdStr )
* 创建 Access 数据库文件(.mdb)
Local IsOK
IsOK = .F.
tcMdbFile = iif(Type([tcMdbFile])=[C], tcMdbFile, [])
tcPswdStr = iif(Type([tcPswdStr])=[C], tcPswdStr, [])
If File(tcMdbFile)
Erase (tcMdbFile)
Endif
If !File(tcMdbFile)
IsOK = .T.
Local loEngine, lcOldError, lcCmdStrs
lcOldError = On([ERROR])
On Error IsOK = .F.
loCatalog = CreateObject( [ADOX.Catalog] )
lcCmdStrs = [Provider=Microsoft.Jet.OLEDB.4.0] ;
+ [;Data Source=] + tcMdbFile ;
+ [;Jet OLEDB:Database Password=] + tcPswdStr
loCatalog.Create( lcCmdStrs )
Release loCatalog
loCatalog = Null
On Error &lcOldError.
Endif
Return IsOK and File(tcMdbFile)
Endfunc
* --------------------------------------------
Function CompactMDB ( tcMdbFile, tcOldPswd, tcNewPswd )
* 压缩 Access 数据库并设置密码
Local IsOK
IsOK = .F.
tcMdbFile = iif(Type([tcMdbFile])=[C], tcMdbFile, [])
tcOldPswd = iif(Type([tcOldPswd])=[C], tcOldPswd, [])
tcNewPswd = iif(Type([tcNewPswd])=[C], tcNewPswd, tcOldPswd)
If File( tcMdbFile )
IsOK = .T.
Local loEngine, lcTmpFile, lcOldError, lcCompOldStr, lcCompNewStr
lcOldError = On([ERROR])
On Error IsOK = .F.
lcTmpFile = Addb(JustPath(tcMdbFile)) + subs(Sys(2015),3) + [.mdb]
Rename (tcMdbFile) To (lcTmpFile)
If !File(tcMdbFile) and File(lcTmpFile)
lcCompOldStr = [Provider=Microsoft.Jet.OLEDB.4.0] ;
+ [;Data Source=] + lcTmpFile ;
+ [;Jet OLEDB:Database Password=] + tcOldPswd
lcCompNewStr = [Provider=Microsoft.Jet.OLEDB.4.0] ;
+ [;Data Source=] + tcMdbFile ;
+ [;Jet OLEDB:Database Password=] + tcNewPswd
loEngine = CreateObject( [JRO.JetEngine] )
( lcCompOldStr, lcCompNewStr )
Release loEngine
loEngine = Null
If File(tcMdbFile)
Erase (lcTmpFile)
Else
Rename (lcTmpFile) To (tcMdbFile)
Endif
Else
IsOK = .F.
Endif
On Error &lcOldError.
Endif
Return IsOK and File(tcMdbFile)
Endfunc
* --------------------------------------------
Function ChangeMdbPassword ( tcMdbFile, tcOldPswd, tcNewPswd )
* 修改 Access 数据库的密码,必须独占打开数据库,使用前请确保没有其他程序使用数据库
Local IsOK
IsOK = .F.
lcRetuStr = []
tcMdbFile = iif(Type([tcMdbFile])=[C], tcMdbFile, [])
tcOldPswd = iif(Type([tcOldPswd])=[C], tcOldPswd, [])
tcNewPswd = iif(Type([tcNewPswd])=[C], tcNewPswd, [])
If File( tcMdbFile )
IsOK = .T.
Local loADODB, lcOldError
lcOldError = On([ERROR])
On Error IsOK = .F.
loADODB = CreateObject( [ADODB.Connection] )
loADODB.Mode = 12
loADODB.Provider = [Microsoft.Jet.OLEDB.4.0]
loADODB.Properties([Jet OLEDB:Database Password]) = tcOldPswd
loADODB.Open([Data Source=] + tcMdbFile)
loADODB.Execute(\'ALTER DATABASE PASSWORD [\' + tcNewPswd + \'][\' + tcOldPswd + \']\')
loADODB.Close
Release loADODB
loADODB = Null
On Error &lcOldError.
Endif
Return IsOK
Endfunc
* --------------------------------------------
[ 本帖最后由 时光如梭 于 2012-8-24 19:00 编辑 ]
