From: emanuel.eklund@...
Date: 2008-04-09T19:40:06+09:00
Subject: Re: rmagick via parallels

On Mar 1, 1:13 am, Paul Rogers <pmr16...@gmail.com> wrote:
> 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

Hi!

I also have this problem. It seems that it occurs when the image is to
big. When I reduced the window that I wanted to make a snapshot of it
works. Please post here again if you find out how to handle bigger
images.

/Malle