[VB.NET 2005] Utilisation Api Avifil32

Bonjours tout le monde, voila j'ai un probleme avec l'api "avifil32" pour obtenir des infos sur les fichiers avi.J'arrive a ouvrir le fichier avec la fonction "AVIFileOpen" mais aucun moyen de faire fonctionner la fonction pour obtenir les infos "AVIFileInfo".
Les fonctions doivent retourné 0 si sa marche.

Code:

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Imports System.Runtime.InteropServices
Public Class TEST
#Region "Structure"
    <StructLayout(LayoutKind.Sequential, Pack:=1)> Private Structure AVIFILEINFO
        Public dwMaxBytesPerSecond As Int32
        Public dwFlags As Int32
        Public dwCaps As Int32
        Public dwStreams As Int32
        Public dwSuggestedBufferSize As Int32
        Public dwWidth As Int32
        Public dwHeight As Int32
        Public dwScale As Int32
        Public dwRate As Int32
        Public dwLength As Int32
        Public dwEditCount As Int32
        <MarshalAs(UnmanagedType.ByValArray, SizeConst:=64)> Public szFileType As Char()
    End Structure
#End Region
#Region "Declarations"
    'Fonction D'ouverture du fichier avi
    Private Declare Auto Function AVIFileOpen Lib "avifil32" (ByRef ppfile As IntPtr, ByVal szFile As String, ByVal mode As Integer, ByVal pclsidHandler As Integer) As Integer
    'Fonction pour relacher le fichier
    Private Declare Auto Function AVIFileRelease Lib "avifil32" (ByVal pfile As IntPtr) As Integer
    'Fonction pour recupurer les informations du fichier ouvert
    Private Declare Auto Function AVIFi Lib "avifil32" Alias "AVIFileInfo" (ByVal pfile As IntPtr, ByRef pfi As AVIFILEINFO, ByVal lSize As Integer) As Integer
    'Fonction pour initialiser l'api
    Private Declare Auto Sub AVIFileInit Lib "avifil32" ()
    'Fonction pour fermer l'api
    Private Declare Auto Sub AVIFileExit Lib "avifil32" ()
#End Region
 
#Region "Constantes"
    Private Const OF_SHARE_DENY_WRITE As Integer = 32
    Private Const OF_READWRITE As Integer = 2
#End Region
#Region "Functions"
    Function GetAviInformations() As String
        Dim H_File As New IntPtr
        Dim pfi As New AVIFILEINFO
 
        AVIFileInit()
 
        AVIFileOpen(H_File, "c:/test.avi", OF_READWRITE, 0)
 
        'Devrait retourné 0
        Debug.WriteLine(AVIFi(H_File, pfi, Marshal.SizeOf(pfi)))
 
        AVIFileRelease(H_File)
 
        AVIFileExit()
 
        Return "Test"
    End Function
#End Region
End Class

AVIFileInfo

AVIFILEINFO

Merci beaucoup :)