UPDATE - Sorry, scratch the following.....there is no way to pass a clipboard option through the cli.......unless you add the option to the source code and compile it yourself.....alternatively, go to the xfce website and request the feature......
Ok,
I have had a look at the source code for the screenshooter, and here is your solution:
for full screen to clipboardCode:xfce4-screenshooter -fh
for active window to clipboardCode:xfce4-screenshooter -wh
for selected region to clipboardCode:xfce4-screenshooter -rh
of course include -d <delay> if you want to have a delay before the screenshot is taken
According to the source, you must include a region (-f fullscreen, -w window or -r region) to prevent the dialog poping up, and, of course, adding h (hide save dialog) to that ensures the image goes to the clipboard.
Cheers.
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