[RESOLVED] convert BMP to JPG (VaryQualityLevel)

[marl]

Hi there all Good People,

Please, please, please, please would anybody help me with this one?

I'm using an example code from msdn in my project to convert a BMP file to JPG file.

the code comes from here: http://msdn.microsoft.com/en-us/libr...90%29.aspx#Y74

this code allows you to pick quality/compresion level of the output JPG file.

this is how it looks like:

Private Sub VaryQualityLevel()
    ' Get a bitmap.
    Dim bmp1 As New Bitmap("c:\TestPhoto.jpg")
    Dim jgpEncoder As ImageCodecInfo = GetEncoder(ImageFormat.Jpeg)

    ' Create an Encoder object based on the GUID
    ' for the Quality parameter category.
    Dim myEncoder As System.Drawing.Imaging.Encoder = System.Drawing.Imaging.Encoder.Quality

    ' Create an EncoderParameters object.
    ' An EncoderParameters object has an array of EncoderParameter
    ' objects. In this case, there is only one
    ' EncoderParameter object in the array.
    Dim myEncoderParameters As New EncoderParameters(1)

    Dim myEncoderParameter As New EncoderParameter(myEncoder, 50&)
    myEncoderParameters.Param(0) = myEncoderParameter
    bmp1.Save("c:\TestPhotoQualityFifty.jpg", jgpEncoder, myEncoderParameters)

    myEncoderParameter = New EncoderParameter(myEncoder, 100&)
    myEncoderParameters.Param(0) = myEncoderParameter
    bmp1.Save("c:\TestPhotoQualityHundred.jpg", jgpEncoder, myEncoderParameters)

    ' Save the bitmap as a JPG file with zero quality level compression.
    myEncoderParameter = New EncoderParameter(myEncoder, 0&)
    myEncoderParameters.Param(0) = myEncoderParameter
    bmp1.Save("c:\TestPhotoQualityZero.jpg", jgpEncoder, myEncoderParameters)

End Sub 'VaryQualityLevel



...


Private Function GetEncoder(ByVal format As ImageFormat) As ImageCodecInfo

    Dim codecs As ImageCodecInfo() = ImageCodecInfo.GetImageDecoders()

    Dim codec As ImageCodecInfo
    For Each codec In codecs
        If codec.FormatID = format.Guid Then
            Return codec
        End If
    Next codec
    Return Nothing

End Function

Now... for some reason it locks the original file ("c:\TestPhoto.jpg" in the example above), so you cannot use it for some time - sometimes many minutes. If you try to delete the file you get an error message saying it is being used by another process. You cannot overwrite it/rename it/move it... If I close my program and reopen it immediatelly the file becames available again, so closing the program somehow kills the process, but I have no idea what kind of process it might be.

What is missing in the above code? How do I identify and kill this process? How do I make the original file available again?

Any ideas?