VB6 Application Cannot Access to Mapped Drives

Problem : User open window dialog to pick a file on mapped drive, but the user cannot browse to the drive.

Solution : configure the EnableLinkedConnections registry value

VBSmart Menu XP in Windows Vista

I use VBSmart Menu XP (SmartMenuXP.dll and SmartMenuXP.ocx) in Windows 98 and XP for a long time. Now, I switched to Windows Vista Business Edition. It comes the problem, every time I click menu VBSmart Menu XP, the program hangs.

After trying to find many solution, at last, I try to change themes from “Windows Vista” to “Windows Classic”,then VBSmart was no problem anymore.

In fact, this solution is sufficient, but it was jammed, when to use my program, i have to change the theme again.

Then I tried to restore the theme to “Windows Vista”, then I try to change the visual effects settings in

Control Panel \ System and Maintenance \ System

then select “Advanced system settings”
in the frame “Performance” , click the button “Settings”,
then disable the option “Enable desktop composition”.



Get MAC Address with VB6

List source code to get MAC Address of a computer

Private Const NCBASTAT As Long = &H33
Private Const NCBNAMSZ As Long = 16
Private Const HEAP_ZERO_MEMORY As Long = &H8
Private Const NCBRESET As Long = &H32
ncb_command As Byte
ncb_retcode As Byte
ncb_lsn As Byte
ncb_num As Byte
ncb_buffer As Long
ncb_length As Integer
ncb_callname As String * NCBNAMSZ
ncb_name As String * NCBNAMSZ
ncb_rto As Byte
ncb_sto As Byte
ncb_post As Long
ncb_lana_num As Byte
ncb_cmd_cplt As Byte
ncb_reserve(9) As Byte ‘ Reserved, must be 0
ncb_event As Long
End Type
adapter_address(5) As Byte
rev_major As Byte
reserved0 As Byte
adapter_type As Byte
rev_minor As Byte
duration As Integer
frmr_recv As Integer
frmr_xmit As Integer
iframe_recv_err As Integer
xmit_aborts As Integer
xmit_success As Long
recv_success As Long
iframe_xmit_err As Integer
recv_buff_unavail As Integer
t1_timeouts As Integer
ti_timeouts As Integer
Reserved1 As Long
free_ncbs As Integer
max_cfg_ncbs As Integer
max_ncbs As Integer
xmit_buf_unavail As Integer
max_dgram_size As Integer
pending_sess As Integer
max_cfg_sess As Integer
max_sess As Integer
max_sess_pkt_size As Integer
name_count As Integer
End Type
Private Type NAME_BUFFER
name As String * NCBNAMSZ
name_num As Integer
name_flags As Integer
End Type
Private Type ASTAT
NameBuff(30) As NAME_BUFFER
End Type

Private Declare Function Netbios Lib “netapi32.dll” (pncb As NET_CONTROL_BLOCK) As Byte
Private Declare Sub CopyMemory Lib “kernel32” Alias “RtlMoveMemory” (hpvDest As Any, ByVal hpvSource As Long, ByVal cbCopy As Long)
Private Declare Function GetProcessHeap Lib “kernel32” () As Long
Private Declare Function HeapAlloc Lib “kernel32” (ByVal hHeap As Long, ByVal dwFlags As Long, ByVal dwBytes As Long) As Long
Private Declare Function HeapFree Lib “kernel32” (ByVal hHeap As Long, ByVal dwFlags As Long, lpMem As Any) As Long

Function GetMACAddress() As String
‘retrieve the MAC Address for the network controller
‘installed, returning a formatted string
Dim tmp As String
Dim pASTAT As Long
‘The IBM NetBIOS 3.0 specifications defines four basic
‘NetBIOS environments under the NCBRESET command. Win32
‘follows the OS/2 Dynamic Link Routine (DLR) environment.
‘This means that the first NCB issued by an application
‘must be a NCBRESET, with the exception of NCBENUM.
‘The Windows NT implementation differs from the IBM
‘NetBIOS 3.0 specifications in the NCB_CALLNAME field.
NCB.ncb_command = NCBRESET
Call Netbios(NCB)
‘To get the Media Access Control (MAC) address for an
‘ethernet adapter programmatically, use the Netbios()
‘NCBASTAT command and provide a “*” as the name in the
‘NCB.ncb_CallName field (in a 16-chr string).
NCB.ncb_callname = “* ”
NCB.ncb_command = NCBASTAT
‘For machines with multiple network adapters you need to
‘enumerate the LANA numbers and perform the NCBASTAT
‘command on each. Even when you have a single network
‘adapter, it is a good idea to enumerate valid LANA numbers
‘first and perform the NCBASTAT on one of the valid LANA
‘numbers. It is considered bad programming to hardcode the
‘LANA number to 0 (see the comments section below).
NCB.ncb_lana_num = 0
NCB.ncb_length = Len(AST)
If pASTAT = 0 Then
Debug.Print “memory allocation failed!”
Exit Function
End If
NCB.ncb_buffer = pASTAT
Call Netbios(NCB)
CopyMemory AST, NCB.ncb_buffer, Len(AST)
tmp = Format$(Hex(AST.adapt.adapter_address(0)), “00”) & “-” & Format$(Hex(AST.adapt.adapter_address(1)), “00”) & “-” & Format$(Hex(AST.adapt.adapter_address(2)), “00”) & “-” & Format$(Hex(AST.adapt.adapter_address(3)), “00”) & “-” & Format$(Hex(AST.adapt.adapter_address(4)), “00”) & “-” & Format$(Hex(AST.adapt.adapter_address(5)), “00”)
HeapFree GetProcessHeap(), 0, pASTAT
GetMACAddress = tmp
End Function

Private Sub Form_Load()
Me.Caption = “Network adapter address: ” + GetMACAddress()
End Sub

(this code found when i googling, i don’t remember where anymore ,
this is not code that i created and i don’t claim it.
if someone don’t want to share than don’t use internet, stay at your bed
so i post this code for me to remember and to share this good thing to good people for the good sake)

VB6 on Vista, Error accessing the OLE Registry

When i open VB6 on Vista, i get this message “Automation Error, Error accessing the OLE Registry”.

To avoid this message appears again, i check compatibility to XP and “Run As Administrator”, and now i can work with VB6.


ActiveX component can’t create – DllRegisterServer failed – VB6 – Vista

I’m getting an Error 429 : ActiveX component can’t create object when trying to run a program that ran perfectly fine on Windows XP. It was created in VB6 but does not run on my version of Vista.

So i try to run regsvr32 to register some ocx and dll. But I got error message when i registered some *.dll or *.ocx with regsvr32 in vista,

“The module *.dll was loaded but the call to DllRegisterServer failed with error code 0x800004005”.

The solution is to register the component from just a batch file, right-click and then click “Run as Administrator” fro pop-up menu.