[vbox-dev] TakeScreenShot

[一生有你]

I use TakeScreenShot in "VirtualBox" process(which is generated by  src/vbox/frontends/virtualbox/src/main.cpp in the source code )  ,
 this time, TakeScreenShot does not fail,,but,,,the return image data are all zero.... why????
 eg:I just want to get the screen data of a vm not less then 20 frames per second...and I develop environment is Ubuntu13.04..
 thanks !
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