It may be that the Unicode characters used by COM are to blame. From the Python side of the world, try returning 'buffer(ob.getvalue())' - Python will try and return a buffer object as an array of characters, rather than a 'string' (which is Unicode).
The end result is to try and ensure that 'imageBytes' is *identical* to the string passed by Python - I suspect it is not, which is the root of the problem. Cheers, Mark > -----Original Message----- > From: [EMAIL PROTECTED] > [mailto:[EMAIL PROTECTED] Behalf Of Michael Schulz > Sent: Friday, 17 November 2006 7:10 PM > To: python-win32@python.org > Subject: [python-win32] passing image as string/stream from > python to vb > > > Hi, > > I'm a beginner on the python-win32 field, so please excuse > stupid questions ;-) > > We have an vb application that uses a python com server. This python > module generates images in a stringio object. We want to pass the > image as a string / stream to the vb application. This is in a way > working, as we get the data in vb, but the image cannot be rendered > there due to an exception from system.drawing.dll "invalid parameter > used". > > The server has a drawing method the returns the image from a stringio > via getvalue(). > The relevant vb code, that should take the string and show it in an > image object: > > Dim bSPil As Object = CreateObject("Python.BSPil") > Dim imageString As String > imageString = bSPil.return_image() > Dim imageBytes() As Byte = (New UTF8Encoding()).GetBytes(imageString) > Dim ms As New IO.MemoryStream(imageBytes) > pb1.Image = System.Drawing.Image.FromStream(ms) > > The error is raised at the last line. When saving the image from > python to a file and reading it as a filestream in vb, the image is > displayed correctly. Can anybody shed some light on this. > > Thanks, Michael > > -- > ----------------------------------------------------------- > Michael Schulz > [EMAIL PROTECTED] > ----------------------------------------------------------- > _______________________________________________ > Python-win32 mailing list > Python-win32@python.org > http://mail.python.org/mailman/listinfo/python-win32 > _______________________________________________ Python-win32 mailing list Python-win32@python.org http://mail.python.org/mailman/listinfo/python-win32
