[poppler] About pdf to image

[杨辉强]

Hi, all:
    I am a newbie to poppler. I use utils/pdftoppm.cc to convert a pdf 
file into jpeg images.The generated images are save to disk files. Now I 
wish to know whether it can save the images in memory such as a 
vector<std::string>.  Wishing you can give me some advices.

Thank you!
Best wishes!
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