#include <Windows.h>
#include <iostream>

int main()
{
    SetProcessDpiAwarenessContext(DPI_AWARENESS_CONTEXT_SYSTEM_AWARE);

    HDC hdc = GetDC(0);

    int dpi = GetDeviceCaps(hdc, LOGPIXELSY);

    DeleteObject(hdc);

    std::cout << "DPI:" << dpi << std::endl;

    return 0;
}