截取辅助监视器的屏幕截图时出现图像大小问题

Question

我正在尝试保存与主显示器 resolution/DPI 不同的第二台显示器的屏幕截图（我对这些术语并不完全熟悉，所以我不是很确定），这是代码我正在使用：

public void SaveScreenshot(Screen screen)
{
    using (Bitmap bitmap = new Bitmap(screen.Bounds.Width, screen.Bounds.Height))
    {
        using (Graphics g = Graphics.FromImage(bitmap))
        {
            int x = screen.Bounds.Left;
            int y = screen.Bounds.Top;
            int w = screen.Bounds.Width;
            int h = screen.Bounds.Height;
            g.CopyFromScreen(x, y, 0, 0, new Size(w, h));
        }

        bitmap.Save("screenshot.bmp");
    }
}

问题是生成的图像没有完整的图片，而是有一个更大的裁剪图。

实际：

结果：

我不知道我做错了什么。

Answer 1

我设法使用 EnumDisplaySettings 解决了这个问题：

using System.Drawing;
using System.Runtime.InteropServices;
using System.Windows.Forms;

namespace ScreenResolution
{
    class ScreenResolutionHandler
    {
        const int ENUM_CURRENT_SETTINGS = -1;
        public static Rectangle GetRealRectangle(Screen screen)
        {
            DEVMODE dm = new DEVMODE();
            dm.dmSize = (short)Marshal.SizeOf(typeof(DEVMODE));
            EnumDisplaySettings(screen.DeviceName, ENUM_CURRENT_SETTINGS, ref dm);
            return new Rectangle(dm.dmPositionX, dm.dmPositionY, dm.dmPelsWidth, dm.dmPelsHeight);
        }

        [DllImport("user32.dll")]
        public static extern bool EnumDisplaySettings(string lpszDeviceName, int iModeNum, ref DEVMODE lpDevMode);

        [StructLayout(LayoutKind.Sequential)]
        public struct DEVMODE
        {
            private const int CCHDEVICENAME = 0x20;
            private const int CCHFORMNAME = 0x20;
            [MarshalAs(UnmanagedType.ByValTStr, SizeConst = 0x20)]
            public string dmDeviceName;
            public short dmSpecVersion;
            public short dmDriverVersion;
            public short dmSize;
            public short dmDriverExtra;
            public int dmFields;
            public int dmPositionX;
            public int dmPositionY;
            public ScreenOrientation dmDisplayOrientation;
            public int dmDisplayFixedOutput;
            public short dmColor;
            public short dmDuplex;
            public short dmYResolution;
            public short dmTTOption;
            public short dmCollate;
            [MarshalAs(UnmanagedType.ByValTStr, SizeConst = 0x20)]
            public string dmFormName;
            public short dmLogPixels;
            public int dmBitsPerPel;
            public int dmPelsWidth;
            public int dmPelsHeight;
            public int dmDisplayFlags;
            public int dmDisplayFrequency;
            public int dmICMMethod;
            public int dmICMIntent;
            public int dmMediaType;
            public int dmDitherType;
            public int dmReserved1;
            public int dmReserved2;
            public int dmPanningWidth;
            public int dmPanningHeight;
        }
    }
}

并将原始代码编辑为

public void SaveScreenshot(Screen screen)
{
    Rectangle rect = ScreenResolutionHandler.GetRealRectangle(screen);
    int x = rect.X;
    int y = rect.Y;
    int w = rect.Width;
    int h = rect.Height;

    using (Bitmap bitmap = new Bitmap(w, h))
    {
        using (Graphics g = Graphics.FromImage(bitmap))
        {
            g.CopyFromScreen(x,y, 0, 0, new Size(w, h));
        }

        bitmap.Save("screenshot.bmp");
    }
}

更新：

正如@Jimi 所建议的，最终我不得不启用每个显示器的 dpi 感知，以在将图像放在表单上时保持图像质量

app.manifest

<compatibility xmlns="urn:schemas-microsoft-com:compatibility.v1">
    <application>
        <!-- A list of the Windows versions that this application has been tested on
           and is designed to work with. Uncomment the appropriate elements
           and Windows will automatically select the most compatible environment. -->

        <!-- Windows Vista -->
        <!--<supportedOS Id="{e2011457-1546-43c5-a5fe-008deee3d3f0}" />-->

        <!-- Windows 7 -->
        <supportedOS Id="{35138b9a-5d96-4fbd-8e2d-a2440225f93a}" />

        <!-- Windows 8 -->
        <supportedOS Id="{4a2f28e3-53b9-4441-ba9c-d69d4a4a6e38}" />

        <!-- Windows 8.1 -->
        <supportedOS Id="{1f676c76-80e1-4239-95bb-83d0f6d0da78}" />

        <!-- Windows 10 -->
        <supportedOS Id="{8e0f7a12-bfb3-4fe8-b9a5-48fd50a15a9a}" />

    </application>
</compatibility>

<application xmlns="urn:schemas-microsoft-com:asm.v3">
    <windowsSettings>
        <dpiAware xmlns="http://schemas.microsoft.com/SMI/2005/WindowsSettings">true/pm</dpiAware> <!-- legacy -->
        <dpiAwareness xmlns="http://schemas.microsoft.com/SMI/2016/WindowsSettings">permonitorv2,permonitor</dpiAwareness> <!-- falls back to pm if pmv2 is not available -->
    </windowsSettings>
</application>

截取辅助监视器的屏幕截图时出现图像大小问题

Image size issue while taking a screenshot of the secondary monitor

.net

c#

winforms

system.drawing.graphics