From: Paul Rogers <pmr16366@...>
Date: 2008-03-01T08:14:58+09:00
Subject: rmagick via parallels

I have some code that Im sure used to work on Vista under parallels,
but now only works on Vista on a PC hardware.

Im using Win32::Screenshot to capture the windows screen, and then
using rmagick to save to a file

I now get this exception
Insufficient image data in file `'
:in `from_blob'

the code looks like this

      width, height, bmp = Win32::Screenshot.desktop
        puts "image data height = #{height}  width = #{width}"
        puts "bmp size is #{bmp.size}"
        img = Magick::Image.from_blob(bmp)[0]

I see this displayed

Taking screenshotimage data height = 984  width = 1595
bmp size is 4708494


the gem versions are

rmagick (1.15.9)
    RMagick is an interface between the Ruby programming language and
    the ImageMagick and GraphicsMagick image processing libraries.
win32screenshot (0.0.2)
    Capture Screenshots on Windows with Ruby

and are the same on win and win-parallels.
can any one tell me what it means, and how to fix?

Thanks
Paul