GetSystemMetrics() 为 SM_CXSCREEN 返回错误的值 [英] GetSystemMetrics() returns wrong value for SM_CXSCREEN

问题描述

我遇到了一个有趣的问题.至少在 Vista 中，当桌面 DPI 设置未设置为 100% 时，getSystemMetrics(SM_CXSCREEN) 返回不正确的值.例如，我在 1366x768 屏幕中尝试了 150% 并且 getSystemMetrics() 返回 911 而不是 1366(和 1366/1.5 ~ 911)

I've run into an interesting problem. At least in Vista, getSystemMetrics(SM_CXSCREEN) returns an incorrect value when the desktop DPI settings aren't set at 100%. For example, I tried 150% in a 1366x768 screen and getSystemMetrics() returns 911 instead of 1366 (and 1366 / 1.5 ~ 911)

根据 MSDN，getSystemMetrics(SM_CXSCREEN) 返回像素，所以我认为这个值不会受到 DPI 设置的影响 - 但它是.那么有没有更安全的方法来找出真实的、未缩放的屏幕分辨率?

According to the MSDN, getSystemMetrics(SM_CXSCREEN) returns pixels, so I thought this value wouldn't be affected by the DPI settings - but it is. So is there a safer way to find out the true, unscaled screen resolution?

推荐答案

当你超过 125% 时，程序必须告诉操作系统它是 DPI 感知的才能获得真正的分辨率.最好使用清单来完成，如此 MSDN Library 中所述文章.

A program must tell the operating system that it is DPI-aware to get the true resolution when you go past 125%. That's best done with a manifest, as explained in this MSDN Library article.

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