如何在MFC应用程序中获取系统的当前DPI? [英] How to get the current DPI of a system in MFC Application?

问题描述

我有一个现有的MFC应用程序，该应用程序在Windows 7中的默认DPI(96 dpi)下运行良好，但是当我将DPI增加150％时，UI会失真.我在某些级别使用滚动条已解决问题，请参阅msdn文章.我想知道如何使用MFC代码获取系统的当前DPI，从而设置对话框的高度和宽度.

I have an existing MFC application which runs fine in default DPI ( 96 dpi) in Windows 7. But when I increase the DPI by 150 % the UI gets distorted. I have fixed issues using scroll bars at certain level and referred to msdn article. I am wondering how can I get the current DPI of a system using MFC code so that set the height and widht of a dialog.

请提出建议！

推荐答案

首先，您需要获取屏幕的设备上下文.这很简单，只需调用GetDC，就像这样:

First you need to get the device context for your screen. This is easy, just call GetDC, like this:

HDC screen = GetDC(0);

然后，您要求该设备上下文的设备功能.在您的情况下，您需要每英寸沿X轴和Y轴的像素:

Then you ask for the device capabilities of that device context. In your case, you need the pixels along the X- and Y-axis per inch:

int dpiX = GetDeviceCaps (screen, LOGPIXELSX);
int dpiY = GetDeviceCaps (screen, LOGPIXELSY);

(请参见 http://msdn.microsoft .com/en-us/library/dd144877(v = vs.85).aspx 了解有关GetDeviceCaps的更多信息.

(see http://msdn.microsoft.com/en-us/library/dd144877(v=vs.85).aspx for more information about GetDeviceCaps).

最后，再次释放设备上下文:

Finally, release the device context again:

ReleaseDC (0, screen);

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