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就是读取一个文件, 写一个图片, 第一个像素为文件大小, 其他像素为文件内容RGB分别是一个字节。经测试, 貌似生成的图片比源文件小。

Function ToPic(ByVal file As String) As Bitmap
        Using fs As New FileStream(file, FileMode.Open, FileAccess.Read)
            Dim xx As Integer = Math.Sqrt(fs.Length / 3)
            Dim h As Integer = fs.Length / (3 * xx) + 1
            'If fs.Length Mod (3 * xx) > 0 Then
            '    h += 1
            'End If
            Dim pic As New Bitmap(xx, h)
            Dim x = 1, y = 0
            Dim r, g, b As Byte
            r = fs.Length / 256 / 256
            g = fs.Length / 256 Mod 256
            b = fs.Length Mod 256
            pic.SetPixel(0, y, Color.FromArgb(255, r, g, b))
            Do While fs.Position < fs.Length
                If x >= xx Then
                    y += 1
                    x = 0
                End If
                If fs.Position < fs.Length Then
                    r = fs.ReadByte
                End If
                If fs.Position < fs.Length Then
                    g = fs.ReadByte
                End If
                If fs.Position < fs.Length Then
                    b = fs.ReadByte
                End If
                pic.SetPixel(x, y, Color.FromArgb(255, r, g, b))
                x += 1
            Loop
            Return pic
        End Using
    End Function