Ricarod
(usa Ubuntu)
Enviado em 06/02/2017 - 19:14h
/*
Grabs a screenshot of the root window.
Usage : ./scr_tool <display> <output file>
Example : ./scr_tool :0 /path/to/output.png
Author: S Bozdag <selcuk.bozdag@gmail.com>
*/
#include <assert.h>
#include <stdio.h>
#include <cairo.h>
#include <cairo-xlib.h>
#include <X11/Xlib.h>
int main(int argc, char** argv) {
Display *disp;
Window root;
cairo_surface_t *surface;
int scr;
/* The only checkpoint only concerns about the number of parameters, see "Usage" */
if( argc != 3) {
fprintf(stderr, "Wrong number of parameters given \n");
fprintf(stderr, "Usage: ./ahenk_import <display> <output file> \n");
return 1;
}
/* try to connect to display, exit if it's NULL */
disp = XOpenDisplay( argv[1] );
if( disp == NULL ){
fprintf(stderr, "Given display cannot be found, exiting: %s\n" , argv[1]);
return 1;
}
scr = DefaultScreen(disp);
root = DefaultRootWindow(disp);
/* get the root surface on given display */
surface = cairo_xlib_surface_create(disp, root, DefaultVisual(disp, scr),
DisplayWidth(disp, scr),
DisplayHeight(disp, scr));
/* right now, the tool only outputs PNG images */
cairo_surface_write_to_png( surface, argv[2] );
/* free the memory*/
cairo_surface_destroy(surface);
/* return with success */
return 0;
}
--------
compilei assim:
gcc `pkg-config --cflags --libs cairo` -o getImage getImage.c -lX11 -lcairo
