Calculate height and width of GIF/JPG files

作者: 来源:网络文章时间:2005-12-17 19:58:02

Calculate height and width of GIF/JPG files(3)       On Error Goto EndOfFile     ' In case we run over the file for some reason
      header = Input(2, f)
      If header = Chr$(255) & Chr$(216) Then ' Must start with hex FF D8
         foundMarker = False ' Look for the marker that will contain the height and width
         While Not foundMarker
            header = Input(2, f)    ' Grab the next marker
            ' Look for the marker (in hex) FF C0, FF C1, FF C2, or FF C3
            If header = Chr$(255) & Chr$(192) Or header = Chr$(255) & Chr$(193) _
            Or header = Chr$(255) & Chr$(194) Or header = Chr$(255) & Chr$(195) Then
               ' Next two bytes are the length, then a single byte that can be ignored.

1.Calculate height and width of GIF/JPG files(1)
2.Calculate height and width of GIF/JPG files(2)
3.Calculate height and width of GIF/JPG files(3)
4.Calculate height and width of GIF/JPG files(4)
5.Calculate height and width of GIF/JPG files(5)
6.Calculate height and width of GIF/JPG files(6)

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