如何查询X11显示分辨率？

It seems like an simple problem, but I can't find the answer: How do you query (via X11) what monitors exist and their resolutions?

这似乎是一个简单的问题，但我找不到答案：你如何查询（通过X11）什么监视器存在及其解决方案？

7 个解决方案

#1

Check out display macros and screen macros from the Xlib manual.

查看Xlib手册中的显示宏和屏幕宏。

Specifically:

特别：

• From the first link: ScreenCount(), ScreenOfDisplay()
• 从第一个链接：ScreenCount（），ScreenOfDisplay（）
• From the second link: WidthOfScreen(), HeightOfScreen()
• 从第二个链接：WidthOfScreen（），HeightOfScreen（）

#2

This might be helpfull for cli and scripting

这可能对cli和脚本有用

xwininfo -root

But xRandR might be more accurate, especially, when there is multiple monitor environment:

但是，当存在多个监视器环境时，xRandR可能更准确：

xrandr

#3

For modern X servers, there's also the XRandR extension, which provides the most up-to-date model of multi screen layout information, including overlapping screens and dynamic screen changes.

对于现代X服务器，还有XRandR扩展，它提供了最新的多屏幕布局信息模型，包括重叠屏幕和动态屏幕更改。

Documentation of it is available in the XRandR 1.3.1 Protocol spec and the libXrandr man page.

有关它的文档，请参见XRandR 1.3.1协议规范和libXrandr手册页。

#4

If Xinerama is in use, try XineramaQueryScreens. Otherwise, you may be able to assume a single screen and use (X)WidthOfScreen/(X)HeightOfScreen.

如果正在使用Xinerama，请尝试使用XineramaQueryScreens。否则，您可以假设单个屏幕并使用（X）WidthOfScreen /（X）HeightOfScreen。

(Also see the other answer. It's remotely possible someone is using the old X screen model where your screens are :x.0, :x.1, etc.)

（另请参阅另一个答案。远程可能有人使用旧的X屏幕模型，其屏幕为：x.0，：x.1等）

#5

Clean xrandr output for imagemagick use

xrandr |grep \* |awk '{print $1}'

#6

The library X11 working only with unix-like OS, so it is a not cross-platform solution.

库X11只能使用类似unix的操作系统，因此它不是跨平台的解决方案。

A full code

完整的代码

#include <stdio.h>

#include <X11/Xlib.h>

int
main(const int argc, const char *argv[])
{

    Display *display;
    Screen *screen;

    // open a display
    display = XOpenDisplay(NULL);

    // return the number of available screens
    int count_screens = ScreenCount(display);

    printf("Total count screens: %d\n", count_screens);


    for (int i = 0; i < count_screens; ++i) {
        screen = ScreenOfDisplay(display, i);
        printf("\tScreen %d: %dX%d\n", i + 1, screen->width, screen->height);
    }

    // close the display
    XCloseDisplay(display);

   return 0;
}

A compilation

汇编

gcc -o setup setup.c -std=c11 `pkg-config --cflags --libs x11`

A result (actual for my computer)

结果（我的电脑实际）

Total count screens: 1
    Screen 1: 1366X768

Based on:

基于：

1. https://tronche.com/gui/x/xlib/display/opening.html
2. https://tronche.com/gui/x/xlib/display/opening.html
3. https://tronche.com/gui/x/xlib/display/display-macros.html
4. https://tronche.com/gui/x/xlib/display/display-macros.html
5. https://tronche.com/gui/x/xlib/display/screen-information.html
6. https://tronche.com/gui/x/xlib/display/screen-information.html
7. https://*.com/a/1829747/6003870
8. https://*.com/a/1829747/6003870

#7

Python

蟒蛇

import os
from Xlib import X, display
d = display.Display()
s = d.screen().root
output = os.popen("xrandr --listmonitors | grep '*' | awk {'print $4'}").read().splitlines()
num_sc = s.xinerama_get_screen_count().screen_count
width = s.get_geometry().width
height = s.get_geometry().height
print("Total count screens: %s" % num_sc)
for i in range(num_sc):
    print("\tScreen %s(%s): %sX%s" % (i, output[i], width, height))

Bash

巴什

$ xrandr --listmonitors
$ xrandr
$ xrandr | grep '*' | awk {'print $1'}