c# enumdisplaymonitors怎樣處理用戶輸入

在C#中，EnumDisplayMonitors函數用于枚舉所有可用的顯示監視器。要處理用戶輸入，您需要首先獲取用戶想要查詢的顯示監視器的索引，然后使用該索引調用EnumDisplayMonitors函數。以下是一個簡單的示例，說明如何處理用戶輸入并獲取顯示監視器的相關信息：

using System;
using System.Drawing;
using System.Runtime.InteropServices;

namespace EnumDisplayMonitorsExample
{
    class Program
    {
        [DllImport("user32.dll")]
        private static extern bool EnumDisplayMonitors(IntPtr hdc, IntPtr hwnd, EnumMonitorDelegate lpfnEnum, IntPtr lParam);

        [UnmanagedFunctionPointer(CallingConvention.StdCall)]
        private delegate bool EnumMonitorDelegate(IntPtr hMonitor, IntPtr hdcMonitor, ref RECT lprcMonitor, IntPtr dwData);

        [StructLayout(LayoutKind.Sequential)]
        private struct RECT
        {
            public int Left;
            public int Top;
            public int Right;
            public int Bottom;
        }

        static void Main(string[] args)
        {
            Console.WriteLine("請輸入要查詢的顯示監視器的索引：");
            int monitorIndex = int.Parse(Console.ReadLine());

            if (EnumDisplayMonitors(IntPtr.Zero, IntPtr.Zero, MonitorCallback, IntPtr.Zero))
            {
                Console.WriteLine($"顯示監視器 {monitorIndex} 的信息：");
                Console.WriteLine($"設備名: {monitorInfo.DeviceName}");
                Console.WriteLine($"工作區: {monitorInfo.WorkArea}");
                Console.WriteLine($"分辨率: {monitorInfo.Bounds}");
            }
            else
            {
                Console.WriteLine("無法獲取顯示監視器信息。");
            }
        }

        private static void MonitorCallback(IntPtr hMonitor, IntPtr hdcMonitor, ref RECT lprcMonitor, IntPtr dwData)
        {
            monitorInfo.DeviceName = MonitorFromWindow(hMonitor, MONITOR_DEFAULTTOPRIMARY).DeviceName;
            monitorInfo.WorkArea = MonitorFromWindow(hMonitor, MONITOR_DEFAULTTOPRIMARY).WorkArea;
            monitorInfo.Bounds = MonitorFromWindow(hMonitor, MONITOR_DEFAULTTOPRIMARY).Bounds;

            if (monitorIndex == 0)
            {
                monitorInfo = new MONITORINFOEX();
                monitorInfo.cbSize = (uint)Marshal.SizeOf(monitorInfo);
                MonitorFromWindow(hMonitor, MONITOR_DEFAULTTOPRIMARY, out monitorInfo);
            }
        }

        private static IntPtr MonitorFromWindow(IntPtr hwnd, uint dwFlags)
        {
            return NativeMethods.MonitorFromWindow(hwnd, dwFlags);
        }
    }
}

在這個示例中，我們首先獲取用戶輸入的顯示監視器索引，然后調用EnumDisplayMonitors函數。在回調函數MonitorCallback中，我們使用MonitorFromWindow函數獲取顯示監視器的相關信息，并將其存儲在monitorInfo結構體中。最后，我們將這些信息輸出到控制臺。