API functions isn't working on some computers

[Alex]

The code with API functions below is working perfectly almost on all
computers but on a few ones is not working.
What could be the cause of this?
Thanks
......
Private Declare Function apiNetGetDCName _
Lib "netapi32.dll" Alias "NetGetDCName" _
(ByVal servername As Long, _
ByVal DomainName As Long, _
bufptr As Long) As Long

' function frees the memory that the NetApiBufferAllocate
' function allocates.
Private Declare Function apiNetAPIBufferFree _
Lib "netapi32.dll" Alias "NetApiBufferFree" _
(ByVal buffer As Long) _
As Long

' Retrieves the length of the specified wide string.
Private Declare Function apilstrlenW _
Lib "kernel32" Alias "lstrlenW" _
(ByVal lpString As Long) _
As Long

Private Declare Function apiNetUserGetInfo _
Lib "netapi32.dll" Alias "NetUserGetInfo" _
(servername As Any, _
UserName As Any, _
ByVal level As Long, _
bufptr As Long) As Long

' moves memory either forward or backward, aligned or unaligned,
' in 4-byte blocks, followed by any remaining bytes
Private Declare Sub sapiCopyMem _
Lib "kernel32" Alias "RtlMoveMemory" _
(Destination As Any, _
Source As Any, _
ByVal Length As Long)

Private Declare Function apiGetUserName Lib _
"advapi32.dll" Alias "GetUserNameA" _
(ByVal lpBuffer As String, _
nSize As Long) _
As Long

Private Const MAXCOMMENTSZ = 256
Private Const NERR_SUCCESS = 0
Private Const ERROR_MORE_DATA = 234&
Private Const MAX_CHUNK = 25
Private Const ERROR_SUCCESS = 0&
.....

 

[Dirk Goldgar]

The code with API functions below is working perfectly almost on all
computers but on a few ones is not working.
What could be the cause of this?
Thanks
.....
Private Declare Function apiNetGetDCName _
Lib "netapi32.dll" Alias "NetGetDCName" _
(ByVal servername As Long, _
ByVal DomainName As Long, _
bufptr As Long) As Long

' function frees the memory that the NetApiBufferAllocate
' function allocates.
Private Declare Function apiNetAPIBufferFree _
Lib "netapi32.dll" Alias "NetApiBufferFree" _
(ByVal buffer As Long) _
As Long

' Retrieves the length of the specified wide string.
Private Declare Function apilstrlenW _
Lib "kernel32" Alias "lstrlenW" _
(ByVal lpString As Long) _
As Long

Private Declare Function apiNetUserGetInfo _
Lib "netapi32.dll" Alias "NetUserGetInfo" _
(servername As Any, _
UserName As Any, _
ByVal level As Long, _
bufptr As Long) As Long

' moves memory either forward or backward, aligned or unaligned,
' in 4-byte blocks, followed by any remaining bytes
Private Declare Sub sapiCopyMem _
Lib "kernel32" Alias "RtlMoveMemory" _
(Destination As Any, _
Source As Any, _
ByVal Length As Long)

Private Declare Function apiGetUserName Lib _
"advapi32.dll" Alias "GetUserNameA" _
(ByVal lpBuffer As String, _
nSize As Long) _
As Long

Private Const MAXCOMMENTSZ = 256
Private Const NERR_SUCCESS = 0
Private Const ERROR_MORE_DATA = 234&
Private Const MAX_CHUNK = 25
Private Const ERROR_SUCCESS = 0&
....

Not all API functions are supported on all versions of the Windows
operating system. In particular, several of the netapi32.dll functions
are listed in my documentation as not supported in Windows 95, 98, and
ME, though I haven't ever checked that myself. Can you identify OS
differences between the computers where the code is working and those
where it isn't?

 

[Wayne Morgan]

Adding to what Dirk said, I show that

NetApiBufferFree, NetUserGetInfo, NetGetDCName all require WinNT 3.1 or
newer. They don't work on Win9x.

lstrlenW, RtlMoveMemory will work on Win95 or newer and WinNT 3.1 or newer.

I also found this article which may help with Win9x. It appears to be using
some of the functions above that are listed as not working, but it says it
is calling 16 bit versions of these.

http://msdn.microsoft.com/library/d...the_validating_server_on_windows_95_98_me.asp

 

[Alex]

Thank you very much for your responses, guys.
It's Win XP Pro.
On some computers I've identified that they use the group login that of
course doesn't return the full name (the purpose of this function). I'll need
to look at it (if it's NULL case).