Qt分辨率适配_qt 适配800 x1280的屏幕

在Main函数开头调用HighDpiAdapt()函数

#include "HighDpiAdapt.h"
#include <iostream>
#include <QGuiApplication>

#include <Windows.h>
#include <WinUser.h>
using namespace std;

//将wstring转换成string
string wstring2string(wstring wstr)
{
    string result;
    //获取缓冲区大小，并申请空间，缓冲区大小事按字节计算的
    int len = WideCharToMultiByte(CP_ACP, 0, wstr.c_str(), wstr.size(), NULL, 0, NULL, NULL);
    char* buffer = new char[len + 1];
    //宽字节编码转换成多字节编码
    WideCharToMultiByte(CP_ACP, 0, wstr.c_str(), wstr.size(), buffer, len, NULL, NULL);
    buffer[len] = '\0';
    //删除缓冲区并返回值
    result.append(buffer);
    delete[] buffer;
    return result;
}

void HighDpiAdapt(){
    // 获取当前显示器的数目
    int numbers = GetSystemMetrics(SM_CMONITORS);
    string scale_name = "";
    for (int i = 0; i < numbers; ++i)
    {
        DISPLAY_DEVICEW device;
        device.cb = sizeof(device);
        BOOL result = EnumDisplayDevicesW(NULL, i, &device, 0);
        DEVMODEW device_mode;
        device_mode.dmSize = sizeof(device_mode);
        device_mode.dmDriverExtra = 0;
        result = EnumDisplaySettingsExW(device.DeviceName, ENUM_CURRENT_SETTINGS, &device_mode, 0);
        string screen_name = wstring2string(device.DeviceName);
        scale_name += screen_name;
        scale_name += (device_mode.dmPelsWidth > 1920) ? "=1.5;" : "=1;";  //设置不同的缩放比例系数
    }
    scale_name[scale_name.size() - 1] = '\0';
    qputenv("QT_SCREEN_SCALE_FACTORS", scale_name.c_str());
    //处理图像模糊问题
    QGuiApplication::setAttribute(Qt::AA_UseHighDpiPixmaps);
    //禁止高缩放支持
    //QGuiApplication::setAttribute(Qt::AA_DisableHighDpiScaling);   //AA_EnableHighDpiScaling
    //程序保持默认的尺寸，不缩放
    QGuiApplication::setAttribute(Qt::AA_Use96Dpi);
}
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