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Tip of the Day
Language: VB7
Expertise: Advanced
Jun 16, 2003

IsComDLL - Check whether a DLL is an COM self-registering server

<System.Runtime.InteropServices.DllImport("kernel32")> Shared Function _
    LoadLibrary(ByVal path As String) As Integer
End Function

<System.Runtime.InteropServices.DllImport("kernel32")> Shared Function _
    GetProcAddress(ByVal hModule As Integer, ByVal procName As String) As _
    Integer
End Function

<System.Runtime.InteropServices.DllImport("kernel32")> Shared Sub FreeLibrary _
    (ByVal hModule As Integer)
End Sub

' Check whether a DLL is an COM self-registering server 
Function IsComDLL(ByVal filename As String) As Boolean
    Dim hModule As Long
    Dim procAddress As Long

    ' attempt to load the DLL
    hModule = LoadLibrary(filename)

    If hModule <> 0 Then
        ' the DLL has been loaded
        ' get the address of the DllRegisterServer function
        procAddress = GetProcAddress(hModule, "DllRegisterServer")
        ' if non-zero then the function is there
        IsComDLL = (procAddress <> 0)
        ' free-memory
        FreeLibrary(hModule)
    End If
End Function
Francesco Balena
 
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