查询Windows显示缩放 [英] Querying Windows display scaling

问题描述

我想以编程方式查询 Windows 显示缩放设置:在这种情况下，我希望它返回 125，因为我将显示配置为 125% 缩放.根据

这个输出是错误的，因为使用 125% 缩放我仍然得到相同的结果.怎么做到呢?我正在用 Java 编程，所以我可以使用 JNA.Windows API 解决方案是首选，但其他所有内容，如 .bat 脚本或 registry 查询也可以，只要它对所有 都是可靠的Windows 版本从 7 到 10.

解决方案

这个答案解决了:

#include "pch.h"#include #include int main(){自动 activeWindow = GetActiveWindow();HMONITOR 监视器 = MonitorFromWindow(activeWindow, MONITOR_DEFAULTONEAREST);//获取监视器的逻辑宽度和高度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;//获取显示器的物理宽度和高度开发模式 devMode;devMode.dmSize = sizeof(devMode);devMode.dmDriverExtra = 0;EnumDisplaySettings(monitorInfoEx.szDevice, ENUM_CURRENT_SETTINGS, &devMode);auto cxPhysical = devMode.dmPelsWidth;auto cyPhysical = devMode.dmPelsHeight;//计算缩放因子自动水平刻度 = ((双) cxPhysical/(双) cxLogical);auto verticalScale = ((double) cyPhysical/(double) cyLogical);std::cout <<"水平缩放:" <<水平比例<<"\n";std::cout <<"垂直缩放:" <<垂直刻度；}

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 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):

This output is wrong since I still get the same result with 125% scaling. How can it be done? I'm programming in Java so I can execute C++ using JNA. Windows API solutions are preferred but everything else like a .bat script or registry query is also fine as long as it's reliable for all Windows versions from 7 to 10.

解决方案

This answer solved it:

#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;
}

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