MonitorFitModule.py

import platform
import os

class monitor:
    def __init__(self):

        self.platform = platform.system()

        if self.platform == "Windows":
            import winreg
            import wmi
            import win32api, win32con
            PATH = "SYSTEM\\ControlSet001\\Enum\\"
            m = wmi.WMI()
            # 获取屏幕信息
            monitors = m.Win32_DesktopMonitor()
            for m in monitors:
                subPath = m.PNPDeviceID  #
                # 可能有多个注册表
                if subPath == None:
                    continue
                # 这个路径这里就是你的显示器在注册表中的路径，比如我现在的电脑是在HKEY_LOCAL_MACHINE下面的路径：
                # \SYSTEM\ControlSet001\Enum\DISPLAY\CMN1604\1&8713bca&0&UID0\Device Parameters
                infoPath = PATH + subPath + "\\Device Parameters"
                key = winreg.OpenKey(winreg.HKEY_LOCAL_MACHINE, infoPath)
                # 屏幕信息按照一定的规则保存（EDID）
                value = winreg.QueryValueEx(key, "EDID")[0]
                winreg.CloseKey(key)

                # 屏幕实际尺寸
                self.width, self.height = value[21], value[22]
                # 推荐屏幕分辨率
                self.widthResolutionRecommend = value[56] + (value[58] >> 4) * 256
                self.heightResolutionRecommend = value[59] + (value[61] >> 4) * 256
                # 实际屏幕分辨率
                self.widthResolution = win32api.GetSystemMetrics(win32con.SM_CXSCREEN)  # 获得屏幕分辨率X轴
                self.heightResolution = win32api.GetSystemMetrics(win32con.SM_CYSCREEN) # 获得屏幕分辨率Y轴
                # 屏幕像素密度（Pixels Per Inch）
                self.widthDensity = self.widthResolution / (self.width / 2.54)
                self.heightDensity = self.heightResolution / (self.height / 2.54)
            print("Windows")

        if self.platform == "Linux":
            print("linux")
            # generate temp info file
            fp = os.popen("xrandr")
            lines = fp.read()
            # find resolution
            head = lines.find("current")
            self.widthResolution, head = self.strtol(lines, head)
            self.heightResolution, head = self.strtol(lines, head)
            # find physical size
            head = lines.find("mm")
            while lines[head-1].isdigit():
                head -= 1
            self.width, head = self.strtol(lines, head)
            self.height, head = self.strtol(lines, head)

            self.widthDensity = self.widthResolution / self.width * 25.4
            self.heightDensity = self.heightResolution / self.height * 25.4

            fp.close()

    # 手动设置分辨率及尺寸(mm)
    def set_resolution(self, widthRes, heightRes, width, height):
        self.widthResolution = widthRes
        self.heightResolution = heightRes
        self.width = width
        self.height = height
        self.widthDensity = self.widthResolution / self.width * 25.4
        self.heightDensity = self.heightResolution / self.height * 25.4

    # convert string to int and return new index
    def strtol(self, s, head):
        # pass the nondigits
        while not s[head].isdigit():
            head += 1
        tail = head + 1
        while s[tail].isdigit():
            tail += 1
        val = int(s[head:tail])
        return val, tail

    def show_info(self):
        print("屏幕宽度：", self.width, " (厘米)")
        print("屏幕高度：", self.height, " (厘米)")
        print("水平分辩率: ", self.widthResolution, " (像素)")
        print("垂直分辩率: ", self.heightResolution, " (像素)")
        # 保留小数点固定位数的两种方法
        print("水平像素密度: ", round(self.widthDensity, 2), " (PPI)")
        print("垂直像素密度: ", "%2.f" % self.heightDensity, " (PPI)")

    # 把毫米转换成像素
    def mm_to_px(self, mm):
        return mm * self.heightDensity / 25.4

    # return pixels per millimetre
    def get_ppm(self):
        return self.heightDensity / 25.4