Wayland 上的屏幕截图显示为黑色

我找到了这个code http://ted.mielczarek.org/code/screenshot/在 Ted Mielczarek 网站上截取屏幕截图。

/*
 * gdk-screenshot.cpp: Save a screenshot of the root window in .png format.
 *  If a filename is specified as the first argument on the commandline,
 *  then the image will be saved to that filename. Otherwise, the image will
 *  be saved as "screenshot.png" in the current working directory.
 *
 * Compile with:
 * g++ -o gdk-screenshot gdk-screenshot.cpp `pkg-config --cflags --libs gdk-x11-2.0`
 */

#include <gdk/gdk.h>
#include <gdk/gdkx.h>

int main(int argc, char** argv)
{
  gdk_init(&argc, &argv);
  GdkWindow* window = window = gdk_get_default_root_window ();
  GdkPixbuf* screenshot = gdk_pixbuf_get_from_drawable (NULL, window, NULL,
                            0, 0, 0, 0,
                            gdk_screen_width(),
                            gdk_screen_height());
  GError* error = NULL;
  const char* filename = (argc > 1) ? argv[1] : "screenshot.png";
  return TRUE == gdk_pixbuf_save (screenshot, filename, "png",
                  &error, NULL);
}

I compiled it as described and it appears to work, in that it produces an image with the correct dimensions, but the screenshot is entirely black.

这似乎是一个common https://bugzilla.redhat.com/show_bug.cgi?id=1398556 issue https://bugs.freedesktop.org/show_bug.cgi?id=98672在运行 Wayland 的系统上（我正在使用 Wayland 运行 Archlinux），所以我的问题是：

需要对此代码进行哪些修改才能使其在 Wayland（和 X）上生成正确的屏幕截图？

我有类似的问题。

我使用Xlib来截图，但是这个方法在Wayland上不起作用。每次运行xgetimage都会报错。查资料发现Wayland不允许这样的截图。不过，通过这种方式，我仍然可以获得正确的屏幕尺寸。

现在我使用DBUS调用系统的会话总线来进行截图，这是我阅读Gnome截图源代码时学到的。

这是一个简单的摘要代码：

    method_name = "Screenshot";
    method_params = g_variant_new ("(bbs)",
                                     TRUE,
                                     FALSE, /* flash */
                                     filename);

    connection = g_application_get_dbus_connection (g_application_get_default ());
    g_dbus_connection_call_sync (connection,
                               "org.gnome.Shell.Screenshot",
                               "/org/gnome/Shell/Screenshot",
                               "org.gnome.Shell.Screenshot",
                               method_name,
                               method_params,
                               NULL,
                               G_DBUS_CALL_FLAGS_NONE,
                               -1,
                               NULL,
                               &error);

文档链接在这里：https://developer.gnome.org/references https://developer.gnome.org/references

Gnome 的 GitHub 截图在这里：https://github.com/GNOME/gnome-screenshot https://github.com/GNOME/gnome-screenshot