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Problemstellung:

Manchmal möchte man die Pixelgrößen von Bilddateien mit Hilfe von Access ermitteln.

Lösung:
Es werden Bilder in den Formaten GIF, BMP und JPG ünterstützt.

Folgende Funktion in ein öffentliches Modul kopieren:

Public Type PictureFormat
     sWidth As String
     sHeight As String
 End Type
 Public Function GetPicSize(sFile As String) As PictureFormat
     Dim ff As Integer
     Dim iWidth As Integer
     Dim iHeight As Integer
     Dim iC As Integer
     Dim sTmp As String
     Dim lL As Long
     Dim sDummy As String
     Dim sExt As String
 
    sExt = Right(sFile, 3)
     ff = FreeFile()
     Open sFile For Binary Access Read As #ff
 
    Select Case sExt
         Case "gif"
             Get #ff, 7, iWidth
             Get #ff, 9, iHeight
             Close #ff
         Case "bmp"
             Get #ff, 19, iWidth
             Get #ff, 23, iHeight
             Close #ff
         Case "jpg"
             If Input(2, #ff) <> (Chr$(&HFF) & Chr$(&HD8)) Then
                 Close #ff
                 Exit Function
             End If
             sDummy = Input(2, #ff)
             Do
                 lL = Asc(Input(1, #ff))
                 lL = lL * 256 + Asc(Input(1, #ff))
                 sTmp = Input(lL - 2, #ff)
                 If iC = &HC0 Or iC = &HC2 Then
                     iWidth = Asc(Mid$(sTmp, 4, 1))
                     iWidth = iWidth * 256 + Asc(Mid$(sTmp, 5, 1))
                     iHeight = Asc(Mid$(sTmp, 2, 1))
                     iHeight = iHeight * 256 + Asc(Mid$(sTmp, 3, 1))
                 End If
                 If Input(1, #ff) <> Chr$(255) Then
                     Exit Do
                 End If
                 iC = Asc(Input(1, #ff))
             Loop While iC <> &HD9
             Close #ff
         Case Else
             Exit Function
     End Select
 
    With GetPicSize
         .sWidth = CStr(iWidth)
         .sHeight = CStr(iHeight)
     End With
 
End Function

Der Aufruf z.B.:

Dim tPictureFormat As PictureFormat
 
tPictureFormat = GetPicSize("F:\Downloads\Bilder\anz_wt.gif")
 
MsgBox "Bildbreite: " & tPictureFormat.sWidth & " Pixel" & vbNewLine & _
     "Bildhöhe: " & tPictureFormat.sHeight & " Pixel"

Das Ergebnis:


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21. Mai 2018