查询Windows显示缩放比例

I want to query the Windows display scaling setting programmatically: In this case, I want it to return 125 since I configured my display to be at 125% scaling. According to this https://learn.microsoft.com/en-us/windows-hardware/manufacture/desktop/dpi-related-apis-and-registry-settings#scale article, the following Windows API C++ code can be used:

// Get desktop dc
desktopDc = GetDC(NULL);
// Get native resolution
horizontalDPI = GetDeviceCaps(desktopDc,LOGPIXELSX);
verticalDPI = GetDeviceCaps(desktopDc,LOGPIXELSY);

However, this code always return 96 and 96 for the horizontal as well as vertical DPI which translates to 100% scaling (according to the provided table):

这个输出是错误的，因为我仍然得到相同的结果125%缩放。如何做呢？我正在编程Java所以我可以执行C++ using JNA https://github.com/java-native-access/jna. Windows API解决方案是首选，但其他一切都像.bat脚本或registry查询也可以，只要它对所有人都是可靠的Windows版本来自7 to 10.

This https://stackoverflow.com/a/36864741/3764804答案解决了它：

#include "pch.h"
#include <iostream>
#include <windows.h>

int main()
{
    auto activeWindow = GetActiveWindow();
    HMONITOR monitor = MonitorFromWindow(activeWindow, MONITOR_DEFAULTTONEAREST);

    // Get the logical width and height of the monitor
    MONITORINFOEX monitorInfoEx;
    monitorInfoEx.cbSize = sizeof(monitorInfoEx);
    GetMonitorInfo(monitor, &monitorInfoEx);
    auto cxLogical = monitorInfoEx.rcMonitor.right - monitorInfoEx.rcMonitor.left;
    auto cyLogical = monitorInfoEx.rcMonitor.bottom - monitorInfoEx.rcMonitor.top;

    // Get the physical width and height of the monitor
    DEVMODE devMode;
    devMode.dmSize = sizeof(devMode);
    devMode.dmDriverExtra = 0;
    EnumDisplaySettings(monitorInfoEx.szDevice, ENUM_CURRENT_SETTINGS, &devMode);
    auto cxPhysical = devMode.dmPelsWidth;
    auto cyPhysical = devMode.dmPelsHeight;

    // Calculate the scaling factor
    auto horizontalScale = ((double) cxPhysical / (double) cxLogical);
    auto verticalScale = ((double) cyPhysical / (double) cyLogical);

    std::cout << "Horizonzal scaling: " << horizontalScale << "\n";
    std::cout << "Vertical scaling: " << verticalScale;
}