我正试图检测屏幕保护程序是否正在运行.
这是我到目前为止的代码:
/* LDFLAGS='-L/usr/X11R6/lib/ -lX11 -lXext -lXss' make xidle */
#include <stdio.h>
#include <X11/Xlib.h>
#include <X11/Xutil.h>
#include <X11/extensions/scrnsaver.h>
int
main(int argc, char *argv[])
{
XScreenSaverInfo info;
Display *dpy = XOpenDisplay(NULL);
if(NULL == dpy) {
fprintf(stderr, "failed to open display\n");
return 1;
}
int a = 0;
int b = 0;
XScreenSaverQueryExtension(dpy, &a, &b);
printf("%d %d\n", a, b);
XScreenSaverQueryInfo(dpy, RootWindow(dpy, DefaultScreen(dpy)), &info);
printf("%d %d %d %d\n", info.state, info.til_or_since, info.idle, info.kind);
return 0;
}
但是info.state总是3(ScreenSaverDisabled).我用xscreensaver和gnome-screensaver对此进行了测试.
这是一些示例输出:
92 0
3 0 9903 0
它与运行的屏幕保护程序相同或没有(当然除了info.idle).
附加信息:
$X -version
X.Org X Server 1.13.0
Release Date: 2012-09-05
X Protocol Version 11, Revision 0
窗口管理器:i3
发行版:Arch Linux
编辑:
在[this] [1]的帮助下,我创建了一个xcb版本,但也无效.要在我的测试过程中排除错误,这里是:
我有这个代码在无限循环中运行,而我在后台运行xscreensaver.为了实际激活屏幕保护程序,我使用xscreensaver-command –activate
#include <stdlib.h>
#include <stdio.h>
#include <xcb/xcb.h>
#include <xcb/screensaver.h>
static xcb_connection_t * connection;
static xcb_screen_t * screen;
/**
* Connects to the X server (via xcb) and gets the screen
*/
void magic_begin () {
connection = xcb_connect (NULL, NULL);
screen = xcb_setup_roots_iterator (xcb_get_setup (connection)).data;
}
/**
* Asks X for the time the user has been idle
* @returns idle time in milliseconds
*/
unsigned long magic_get_state () {
xcb_screensaver_query_info_cookie_t cookie;
xcb_screensaver_query_info_reply_t *info;
cookie = xcb_screensaver_query_info (connection, screen->root);
info = xcb_screensaver_query_info_reply (connection, cookie, NULL);
int state = info->state;
return state;
}
int main(int arc, char *argv[])
{
magic_begin();
int state = magic_get_state();
printf("state: %d\n", state);
}
[1]: https://stackoverflow.com/questions/9049087/with-x11-how-can-i-get-the-users-time-away-from-keyboard-while-ignoring-cert
最佳答案 我去了xorg irc频道,并被告知至少xscreensaver不使用我使用的扩展名.