Imports System.Runtime
Imports System.Runtime.InteropServices
 
Public Class Form1
 
  ' zunächst die benötigten API-Deklarationen
  Private Declare Function AVIFileOpen Lib "avifil32" _
    Alias "AVIFileOpenA" ( _
    ByRef ppfile As Integer, _
    ByVal szFile As String, _
    ByVal mode As Integer, _
    ByVal pclsidHandler As Integer) As Integer
 
  Private Declare Function AVIFileRelease Lib "avifil32" ( _
    ByVal pfile As Integer) As Integer
 
  Private Declare Function AVIFileInfo Lib "avifil32" _
    Alias "AVIFileInfoA" ( _
    ByVal pfile As Integer, _
    ByRef pfi As AVIInfo, _
    ByVal lSize As Integer) As Integer
 
  Private Declare Sub AVIFileInit Lib "avifil32" ()
  Private Declare Sub AVIFileExit Lib "avifil32" ()
 
  ' AVI Info-Struktur
  <StructLayout(LayoutKind.Sequential, CharSet:=CharSet.Auto)> _
  Private Structure AVIInfo
    Public dwMaxBytesPerSec As Integer
    Public dwFlags As Integer
    Public dwCaps As Integer
    Public dwStreams As Integer
    Public dwSuggestedBufferSize As Integer
    Public dwWidth As Integer
    Public dwHeight As Integer
    Public dwScale As Integer
    Public dwRate As Integer
    Public dwLength As Integer
    Public dwEditCount As Integer
    <MarshalAs(UnmanagedType.ByValTStr, SizeConst:=64)> _
    Public szFileType As String
  End Structure
 
  ' Breite und Höhe der animierten Bildsequenz ermitteln
  ' (Rückgabewert erfolgt in Pixel!!!)
  Public Sub AVI_GetSize(ByVal sFile As String, _
    ByRef nWidth As Integer, ByRef nHeight As Integer)
 
    Dim hFile As Integer
    Dim AviInfo As New AVIInfo
 
    ' Fehlerbehandlung aktivieren
    On Error Resume Next
 
    ' Initialisieren
    AVIFileInit()
 
    ' AVI öffnen (Handle erstellen)
    If AVIFileOpen(hFile, sFile, &H20, 0&) = 0 Then
      ' Infos lesen
      If AVIFileInfo(hFile, AviInfo, Marshal.SizeOf(AviInfo)) = 0 Then
        nWidth = AviInfo.dwWidth
        nHeight = AviInfo.dwHeight
      End If
      AVIFileRelease(hFile)
    End If
 
    ' Beenden
    AVIFileExit()
    On Error GoTo 0
  End Sub
 
  ' Länge (Spieldauer) ermitteln
  ' (Rückgabewert erfolgt in Millisekunden)
  Public Function AVI_GetLength(ByVal sFile As String) As Integer
    Dim hFile As Integer
    Dim AviInfo As New AVIInfo
    Dim nLength As Integer
 
    ' Fehlerbehandlung aktivieren
    On Error Resume Next
 
    ' Initialisieren
    AVIFileInit()
 
    ' AVI öffnen (Handle erstellen)
    If AVIFileOpen(hFile, sFile, &H20, 0) = 0 Then
      ' Infos lesen
      If AVIFileInfo(hFile, AviInfo, Marshal.SizeOf(AviInfo)) = 0 Then
        nLength = AviInfo.dwLength
      End If
      AVIFileRelease(hFile)
    End If
 
    ' Beenden
    AVIFileExit()
    On Error GoTo 0
 
    ' Rückgabewert
    Return nLength
  End Function
...

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