[Image-SIG] PIL ImageGrab clipboard block
ole.trenner at gmx.de
Sat Apr 14 18:32:22 CEST 2007
I'm currently using the ImageGrab module of PIL for a small image upload
client. I've noticed that the ImageGrab.grabclipboard() method seems to
somehow block the clipboard. I'll try to explain:
This is what works: When the Windows clipboard contains image data when
first trying to use ImageGrab.grabclipboard() it works as supposed. You
can further change the clipboard contents (copy image data from another
application) and reinvoke ImageGrab.grabclipboard() to fetch the new data.
And this is what doesn't work: When the windows clipboard contains text
(or nothing) when trying to use ImageGrab.grabclipboard(), any
subsequent calls to ImageGrab.grabclipboard() fail. AND it seems as if
the clipboard was blocked, i.e. none of my graphical apps is able to
copy image data to the clipboard until my upload client is finished.
This minimal loop can be used to test the behavior:
import Image, ImageGrab
img = ImageGrab.grabclipboard()
if isinstance(img, Image.Image):
print "Found Image"
print "No Image"
print "Press Enter to continue...",
I'd love to see a way to "reset" the clipboard or fix my app to be able
to paste image data even if the clipboard was empty or just contained
text on startup.
Thanks in advance,
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