Windows缩放 [英] Windows scaling

问题描述

Windows 8/10已开始包含一个滑块，该滑块可缩放GUI元素的大小，右键单击桌面->显示.对于拥有4k笔记本电脑屏幕的同事来说是250％，而在4k 28英寸屏幕上使用相同分辨率的同事是150％.

Windows 8/10 has started to include a slider for how much GUI elements should scale, right click on desktop -> display. For a colleague with a laptop 4k-screen it's 250% while another colleague using the same resolution on a 4k 28" screen it's 150%.

我如何以编程方式读取该值?我需要调整一些图形，使其在所有屏幕上看起来都一样.

How do I read that value programmatically? I need to adjust some graphics so it looks the same on all screens.

我正在Eclipse RCP应用程序上使用Java进行工作，但是通过JNI使用C或C ++的方法也可以使用.我一直在环顾四周，但找不到任何东西.

I'm working in Java on a Eclipse RCP application, but a way that uses C or C++ through JNI works too. I've been looking around but can't find anything.

推荐答案

也许是答案，来自

Maybe this answer from here might help you:

[DllImport("gdi32.dll")]
static extern int GetDeviceCaps(IntPtr hdc, int nIndex);
public enum DeviceCap
{
    VERTRES = 10,
    DESKTOPVERTRES = 117,

    // http://pinvoke.net/default.aspx/gdi32/GetDeviceCaps.html
}  


private float getScalingFactor()
{
    Graphics g = Graphics.FromHwnd(IntPtr.Zero);
    IntPtr desktop = g.GetHdc();
    int LogicalScreenHeight = GetDeviceCaps(desktop, (int)DeviceCap.VERTRES);
    int PhysicalScreenHeight = GetDeviceCaps(desktop, (int)DeviceCap.DESKTOPVERTRES); 

    float ScreenScalingFactor = (float)PhysicalScreenHeight / (float)LogicalScreenHeight;

    return ScreenScalingFactor; // 1.25 = 125%
}

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