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  • 获取系统DPI

    public partial class Form1 : Form
        {
    public Form1()
            {
    InitializeComponent();
     
                SetProcessDPIAware(); //重要
                IntPtr screenDC = GetDC(IntPtr.Zero);
                int dpi_x = GetDeviceCaps(screenDC, /*DeviceCap.*/LOGPIXELSX);
                int dpi_y = GetDeviceCaps(screenDC, /*DeviceCap.*/LOGPIXELSY);
                //_scaleUI.X = dpi_x / 96.0;
                //_scaleUI.Y = dpi_y / 96.0;
                ReleaseDC(IntPtr.Zero, screenDC);
     
            }
     
            [DllImport("user32.dll")]
            static extern IntPtr GetDC(IntPtr ptr);
     
            [DllImport("user32.dll", EntryPoint = "ReleaseDC")]
            public static extern IntPtr ReleaseDC(IntPtr hWnd, IntPtr hDc);
     
            [DllImport("gdi32.dll")]
            public static extern IntPtr CreateDC(
            string lpszDriver, // driver name
            string lpszDevice, // device name
            string lpszOutput, // not used; should be NULL
            Int64 lpInitData // optional printer data
            );
     
            [DllImport("gdi32.dll")]
            public static extern int GetDeviceCaps(
            IntPtr hdc, // handle to DC
            int nIndex // index of capability
            );
     
            [DllImport("user32.dll")]
            internal static extern bool SetProcessDPIAware();
     
            const int DRIVERVERSION = 0;
            const int TECHNOLOGY = 2;
            const int HORZSIZE = 4;
            const int VERTSIZE = 6;
            const int HORZRES = 8;
            const int VERTRES = 10;
            const int BITSPIXEL = 12;
            const int PLANES = 14;
            const int NUMBRUSHES = 16;
            const int NUMPENS = 18;
            const int NUMMARKERS = 20;
            const int NUMFONTS = 22;
            const int NUMCOLORS = 24;
            const int PDEVICESIZE = 26;
            const int CURVECAPS = 28;
            const int LINECAPS = 30;
            const int POLYGONALCAPS = 32;
            const int TEXTCAPS = 34;
            const int CLIPCAPS = 36;
            const int RASTERCAPS = 38;
            const int ASPECTX = 40;
            const int ASPECTY = 42;
            const int ASPECTXY = 44;
            const int SHADEBLENDCAPS = 45;
            const int LOGPIXELSX = 88;
            const int LOGPIXELSY = 90;
            const int SIZEPALETTE = 104;
            const int NUMRESERVED = 106;
            const int COLORRES = 108;
            const int PHYSICALWIDTH = 110;
            const int PHYSICALHEIGHT = 111;
            const int PHYSICALOFFSETX = 112;
            const int PHYSICALOFFSETY = 113;
            const int SCALINGFACTORX = 114;
            const int SCALINGFACTORY = 115;
            const int VREFRESH = 116;
            const int DESKTOPVERTRES = 117;
            const int DESKTOPHORZRES = 118;
            const int BLTALIGNMENT = 119;
    }
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  • 原文地址:https://www.cnblogs.com/lisengl/p/4169471.html
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