Gtk 屏幕截图并显示（Linux C语言）

使用 gtk 截图后不需要保存图片文件，直接通过内存中的数据进行显示。
首先安装 gtk :

sudo apt install gtk+-2.0
sudo apt install libgtk2.0*

然后编写应用程序：

#include <gtk/gtk.h>

void destroy(void) {
  gtk_main_quit();
}

GdkPixbuf * get_screenshot(){
    GdkPixbuf *screenshot;
    GdkWindow *root_window;
    gint x_orig, y_orig;
    gint width, height;
    root_window = gdk_get_default_root_window ();
    gdk_drawable_get_size (root_window, &width, &height);      
    gdk_window_get_origin (root_window, &x_orig, &y_orig);

    screenshot = gdk_pixbuf_get_from_drawable (NULL, root_window, NULL,
                                           x_orig, y_orig, 0, 0, width, height);
    return screenshot;
}

int main (int argc, char** argv) {
  GtkWidget* window;
  GtkWidget* image;
  GdkPixbuf * pixbuf;

  gtk_init (&argc, &argv);


  window = gtk_window_new(GTK_WINDOW_TOPLEVEL);
//  image  = gtk_image_new_from_file(argv[1]);

  pixbuf = get_screenshot();
  image = gtk_image_new_from_pixbuf(pixbuf);

  gtk_signal_connect(GTK_OBJECT (window), "destroy",
             GTK_SIGNAL_FUNC (destroy), NULL);

  gtk_container_add(GTK_CONTAINER (window), image);
  gtk_window_set_resizable(window, TRUE);
  gtk_widget_set_size_request(window, 800, 600);

  gtk_widget_show_all(window);

  gtk_main();

  return 0;
}

使用以下命令进行编译:

 gcc -Wall  displaytest.c  -o  displaytest  `pkg-config --cflags gtk+-2.0` `pkg-config --libs gtk+-2.0`