【Windows】WinForms程序调用WinRT的API清空剪切板

首先这是.NET Framework 4.6项目才用的方法，高版本直接安装Microsoft.Windows.SDK.Contracts包来使用就行了。

此代码实现了手动调用API获取WinRT的剪切板对象，并通过虚函数指针调用ClearHistory方法清空剪切板历史记录(Win+V)。

using System;
using System.Runtime.CompilerServices;
using System.Runtime.InteropServices;

namespace Win10ClipboardApiTest
{
    public static class Clipboard
    {
        private enum RO_INIT_TYPE
        {
            RO_INIT_SINGLETHREADED = 0,
            RO_INIT_MULTITHREADED = 1,
        }

        [DllImport("api-ms-win-core-winrt-l1-1-0.dll", CallingConvention = CallingConvention.StdCall)]
        private static extern IntPtr RoInitialize(RO_INIT_TYPE initType);

        [DllImport("api-ms-win-core-winrt-l1-1-0.dll", CallingConvention = CallingConvention.StdCall)]
        private static extern IntPtr RoUninitialize();

        [DllImport("api-ms-win-core-winrt-l1-1-0.dll", CallingConvention = CallingConvention.StdCall)]
        private static extern IntPtr RoGetActivationFactory(IntPtr activatableClassId, byte[] iid, out IntPtr factory);

        [DllImport("api-ms-win-core-winrt-string-l1-1-0.dll", CallingConvention = CallingConvention.StdCall)]
        private static extern IntPtr WindowsCreateString([MarshalAs(UnmanagedType.LPWStr)] string sourceString, int length, out IntPtr hstring);

        [DllImport("api-ms-win-core-winrt-string-l1-1-0.dll", CallingConvention = CallingConvention.StdCall)]
        private static extern IntPtr WindowsDeleteString(IntPtr hstring);

        [MethodImpl(MethodImplOptions.AggressiveInlining)]
        private static bool IsSucceeded(IntPtr result) => (long)result >= 0L;

        // Class Windows.ApplicationModel.DataTransfer.Clipboard
        private static readonly string RuntimeClass_Windows_ApplicationModel_DataTransfer_Clipboard = "Windows.ApplicationModel.DataTransfer.Clipboard";

        // Interface is a part of the implementation of type Windows.ApplicationModel.DataTransfer.Clipboard
        private static readonly byte[] IID_IClipboardStatics2 = Guid.Parse("D2AC1B6A-D29F-554B-B303-F0452345FE02").ToByteArray();

        // IClipboardStatics2::ClearHistory
        [UnmanagedFunctionPointer(CallingConvention.StdCall)]
        private delegate IntPtr IClipboardStatics2ClearHistoryDelegate(IntPtr instance, out byte result);

        // A helper to read the virtual function pointer from virtual table of the instance.
        private static T GetVirtualMethodPointer<T>(IntPtr instance, int index)
        {
            var table = Marshal.ReadIntPtr(instance);
            var pointer = Marshal.ReadIntPtr(table, index * IntPtr.Size);
            return Marshal.GetDelegateForFunctionPointer<T>(pointer);
        }

        public static void ClearHistory()
        {
            if (IsSucceeded(RoInitialize(RO_INIT_TYPE.RO_INIT_SINGLETHREADED)))
            {
                if (IsSucceeded(WindowsCreateString(RuntimeClass_Windows_ApplicationModel_DataTransfer_Clipboard, RuntimeClass_Windows_ApplicationModel_DataTransfer_Clipboard.Length, out IntPtr classId)))
                {
                    if (IsSucceeded(RoGetActivationFactory(classId, IID_IClipboardStatics2, out IntPtr instance)))
                    {
                        var method = GetVirtualMethodPointer<IClipboardStatics2ClearHistoryDelegate>(instance, 7);
                        method.Invoke(instance, out byte result);
                        Marshal.Release(instance);
                    }

                    WindowsDeleteString(classId);
                }

                RoUninitialize();
            }
        }
    }
}