C# NET调用API枚举系统监视器，显示器

最新推荐文章于 2024-01-26 14:52:33 发布

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最新推荐文章于 2024-01-26 14:52:33 发布

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分类专栏： Managed C++ C# 文章标签： c# api struct class user c

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本文提供了一段C#代码，用于枚举系统中所有显示器的信息，并详细解释了如何使用DllImport及自定义委托来调用Windows API函数EnumDisplayMonitors。通过实例展示了如何获取每个显示器的矩形区域。

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using System; using System.Runtime.InteropServices; namespace OpticalTouch { public delegate bool MONITORENUMPROC(IntPtr hMonitor, IntPtr hdcMonitor, IntPtr lprcMonitor, IntPtr dwData); [StructLayout(LayoutKind.Sequential, Size = 8)] public struct RECT { public int Left; public int Top; public int Right; public int Bottom; } [StructLayout(LayoutKind.Sequential, Size = 8)] public struct MonitorInfos { [MarshalAs(UnmanagedType.ByValArray, SizeConst = 256)] public RECT[] Rects; public int Count; } public class MonitorHelper { private MONITORENUMPROC monitorEnumProc; public MonitorHelper() { monitorEnumProc = MonitorEnumProc; } public MonitorInfos EnumMonitors() { MonitorInfos mis = new MonitorInfos(); mis.Rects = new RECT[256]; mis.Count = 0; IntPtr dwData = Marshal.AllocHGlobal(Marshal.SizeOf(typeof(MonitorInfos))); Marshal.StructureToPtr(mis, dwData, true); EnumDisplayMonitors(IntPtr.Zero, IntPtr.Zero, monitorEnumProc, dwData); mis = (MonitorInfos)Marshal.PtrToStructure(dwData, typeof(MonitorInfos)); Marshal.FreeHGlobal(dwData); return mis; } private bool MonitorEnumProc(IntPtr hMonitor, IntPtr hdcMonitor, IntPtr lprcMonitor, IntPtr dwData) { RECT rect = (RECT)Marshal.PtrToStructure(lprcMonitor, typeof(RECT)); MonitorInfos mis = (MonitorInfos)Marshal.PtrToStructure(dwData, typeof(MonitorInfos)); mis.Rects[mis.Count].Left = rect.Left; mis.Rects[mis.Count].Top = rect.Top; mis.Rects[mis.Count].Right = rect.Right; mis.Rects[mis.Count].Bottom = rect.Bottom; mis.Count++; Marshal.StructureToPtr(mis, dwData, true); return true; } [DllImport("User32.dll")] private static extern bool EnumDisplayMonitors(IntPtr hdc, IntPtr pprcClip, MONITORENUMPROC monitorEnumProc, IntPtr dwData); } } 不多写了. 看MSDN, 看代码.

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