GTK/GDK Algorithm to take full screenshots of all monitors

问题

I'm fairly new to the whole GTK game and want to create an algorithm to take screen shot of all monitors.

I was thinking something along these lines:

1. gdk_display_manager_list_displays
2. each display can have multiple screens (screens means monitors?) so use gdk_display_get_n_screens to get monitors per display from 1
3. get root gtk window of all screens from 2
4. create new Pixbuf for each root gtk window for each screen from 3 with gdk_pixbuf_new
5. fill each pixbuf from 4 with gdk_pixbuf_get_from_drawable for each respective root window from 3 for each respective screen from 2 for each respective display from 1 (may need to gdk_drawable_get_size and gdk_window_get_origin for each for args to pixbuf)
6. gdk_pixbuf_get_pixels for each pixbuf

Is this a workable solution?

回答1:

If you are sure cRootWin is not NULL and cWidth and cHeight are greater than 0 then you should check for some additional problem mentioned by the doc.

A wild guess is your program does not have enough memory to store the pixmap (typically 6 Mb). I would try to allocate the 12 Mb just to see if this is the case.

来源：https://stackoverflow.com/questions/30145532/gtk-gdk-algorithm-to-take-full-screenshots-of-all-monitors