How to register a file in Visual Basic

When develop a software, there must be a supported file requirement, for example: ocx file (*.ocx), dll file (*.dll).
Topic: How to supporting Register File through coding with Visual Basic because many cases that supported files will not run before registered to the (Windows) system.

As an example may be you had experienced about application can't be run or find runtime error after install your software to another computer as long as supporting files are not registered, so how to direct registered supported file through coding? Please follow the below steps.

'Put the following code to the Module Project
Private Declare Function LoadLibraryRegister Lib "kernel32" Alias "LoadLibraryA" (ByVal lpLibFileName As String) As Long

Private Declare Function CreateThreadForRegister Lib "kernel32" Alias "CreateThread" (lpThreadAttributes As Any, ByVal dwStackSize As Long, ByVal lpStartAddress As Long, ByVal lParameter As Long, ByVal dwCreationFlags As Long, lpThreadID As Long) As Long

Private Declare Function WaitForSingleObject Lib "kernel32" (ByVal hHandle As Long, ByVal dwMilliseconds As Long) As Long

Private Declare Function GetProcAddressRegister Lib "kernel32" Alias "GetProcAddress" (ByVal hModule As Long, ByVal lpProcName As String) As Long

Private Declare Function FreeLibraryRegister Lib "kernel32" Alias "FreeLibrary" (ByVal hLibModule As Long) As Long

Private Declare Function CloseHandle Lib "kernel32" (ByVal hObject As Long) As Long

Private Declare Function GetExitCodeThread Lib "kernel32" (ByVal hThread As Long, lpExitCode As Long) As Long

Private Declare Sub ExitThread Lib "kernel32" (ByVal dwExitCode As Long)

Public Function RegServer(ByVal FileName As String) As Boolean
RegServer = RegSvr32(FileName, False)
End Function

Public Function UnRegServer(ByVal FileName As String) As Boolean
UnRegServer = RegSvr32(FileName, True)
End Function

Private Function RegSvr32(ByVal FileName As String, bUnReg As Boolean) As Boolean

Dim lLib As Long
Dim lProcAddress As Long
Dim lThreadID As Long
Dim lSuccess As Long
Dim lExitCode As Long
Dim lThread As Long
Dim bAns As Boolean
Dim sPurpose As String

sPurpose = IIf(bUnReg, "DllUnregisterServer", _
"DllRegisterServer")

If Dir(FileName) = "" Then Exit Function

lLib = LoadLibraryRegister(FileName)
If lLib = 0 Then Exit Function

lProcAddress = GetProcAddressRegister(lLib, sPurpose)

If lProcAddress = 0 Then
FreeLibraryRegister lLib
Exit Function
Else
lThread = CreateThreadForRegister(ByVal 0&, 0&, ByVal lProcAddress, ByVal 0&, 0&, lThread)
If lThread Then
lSuccess = (WaitForSingleObject(lThread, 10000) = 0)
If Not lSuccess Then
Call GetExitCodeThread(lThread, lExitCode)
Call ExitThread(lExitCode)
bAns = False
Exit Function
Else
bAns = True
End If
CloseHandle lThread
FreeLibraryRegister lLib
End If
End If
RegSvr32 = bAns
End Function

'Implemented example from
Public Function Sub RegisterFile() as Boolean
Dim FileSys1 As String

FileSys1 = "C:\Windows\System32\MSCOMCTL.OCX
If Dir(FileSys1) <> "" Then
RegisterFile = RegServer(FileSys1)
End If
End Function