Are you saying that doing a screen capture is hard, or recognizing the graphical
objects from the screen capture? (I got the last part solved).
I am saying tha tto capture the screen in Linux, you must have access to the
display buffer.
If it runs Xwindows, in an application a buffer is created
A sequece would be something like this:
Display *mydisplay;
mydisplay = XOpenDisplay(displayname);
XDrawPoint(mydisplay, topwindow, xptestgc, x, y);
etc... (omitted important stuff).
'mydisplay' will be internal to the application, can even be a local variable...
So if your application needs to read say graphic text, or boxes from the
display, you have no access.
You cannot grab data from the graphics card either, as all are different
(bypass driver).
There are many modes in X too, and there is the framebuffer that can be used.
And then the same again for applications that use vgalib or just the
basic text console.
I would not know how to do it in a way that worked for _all_ systems known
on Linux.
This is assuming your application reads what is on the screen, what you
told me.
