从桌面获取选定的文件 [英] Get selected files from Desktop

问题描述

我正在尝试从桌面获取所选文件的列表.我得到了正确数量的文件，但我得到了像这样奇怪的文件名，例如:㺘㺘㺘䁐\u0086\u0002.我正在使用 LVM_GETITEM 消息 来获取信息.这是我的代码:

I'm trying to get a list of selected files from the Desktop. I get the correct amount of files, but I get weird file names like this for example: 㺘ݔ䁐\u0086\u0002. I'm using the LVM_GETITEM message to get the info. This is my code:

        public string GetItemText(int idx)
        {
            const int MAX_SIZE = 512;
            byte[] szBuffer = new byte[MAX_SIZE];

            LVITEM lvi = new LVITEM
            {
                mask = LVIF_TEXT,
                cchTextMax = MAX_SIZE,
                iItem = idx,
                iSubItem = 0,
                pszText = Marshal.AllocHGlobal(MAX_SIZE)
            };

            // Fill LVITEM structure
            IntPtr ptrLvi = Marshal.AllocHGlobal(Marshal.SizeOf(lvi));
            Marshal.StructureToPtr(lvi, ptrLvi, false);
            int readBytes = 0;
            try
            {
                readBytes = SendMessagePtr(ShellListViewHandle, LVM_GETITEM, IntPtr.Zero, ptrLvi);
            }
            catch (Exception ex)
            {
                System.Diagnostics.Debug.WriteLine(ex.Message);
            }

            // Get the text
            string itemText = Marshal.PtrToStringAuto(lvi.pszText);
            return itemText;
        }

推荐答案

你不能使用 用于脚本编写的 Shell 对象 AFAIK.你只能从它开始，然后使用原生的 Shell 接口.

You cannot do that using the Shell Objects for Scripting AFAIK. You can only start with it and then use native Shell interfaces.

这里解释了这个原理操纵桌面图标的位置 在 C/C++ 中.

This principles are explained here Manipulating the positions of desktop icons in C/C++.

这是一个类似的 C# 控制台应用程序，它会转储当前在桌面中选择的所有项目名称，您必须根据需要进行调整或扩展:

Here is a similar C# Console app that dumps out all items names currently selected in the desktop, you'll have to adapt or expand depending on what you need:

public class Program
{
    static void Main()
    {
        // we basically follow https://devblogs.microsoft.com/oldnewthing/20130318-00/?p=4933
        dynamic app = Activator.CreateInstance(Type.GetTypeFromProgID("Shell.Application"));
        var windows = app.Windows;

        const int SWC_DESKTOP = 8;
        const int SWFO_NEEDDISPATCH = 1;
        var hwnd = 0;
        var disp = windows.FindWindowSW(Type.Missing, Type.Missing, SWC_DESKTOP, ref hwnd, SWFO_NEEDDISPATCH);

        var sp = (IServiceProvider)disp;
        var SID_STopLevelBrowser = new Guid("4c96be40-915c-11cf-99d3-00aa004ae837");

        var browser = (IShellBrowser)sp.QueryService(SID_STopLevelBrowser, typeof(IShellBrowser).GUID);
        var view = (IFolderView)browser.QueryActiveShellView();

        view.Items(SVGIO.SVGIO_SELECTION, typeof(IShellItemArray).GUID, out var items);
        if (items is IShellItemArray array)
        {
            for (var i = 0; i < array.GetCount(); i++)
            {
                var item = array.GetItemAt(i);
                Console.WriteLine(item.GetDisplayName(SIGDN.SIGDN_NORMALDISPLAY));
            }
        }
    }

    [Guid("6D5140C1-7436-11CE-8034-00AA006009FA"), InterfaceType(ComInterfaceType.InterfaceIsIUnknown)]
    private interface IServiceProvider
    {
        [return: MarshalAs(UnmanagedType.IUnknown)]
        object QueryService([MarshalAs(UnmanagedType.LPStruct)] Guid service, [MarshalAs(UnmanagedType.LPStruct)] Guid riid);
    }

    // note: for the following interfaces, not all methods are defined as we don't use them here
    [Guid("000214E2-0000-0000-C000-000000000046"), InterfaceType(ComInterfaceType.InterfaceIsIUnknown)]
    private interface IShellBrowser
    {
        void _VtblGap1_12(); // skip 12 methods https://stackoverflow.com/a/47567206/403671

        [return: MarshalAs(UnmanagedType.IUnknown)]
        object QueryActiveShellView();
    }

    [Guid("cde725b0-ccc9-4519-917e-325d72fab4ce"), InterfaceType(ComInterfaceType.InterfaceIsIUnknown)]
    private interface IFolderView
    {
        void _VtblGap1_5(); // skip 5 methods

        [PreserveSig]
        int Items(SVGIO uFlags, Guid riid, [MarshalAs(UnmanagedType.IUnknown)] out object items);
    }

    [Guid("43826d1e-e718-42ee-bc55-a1e261c37bfe"), InterfaceType(ComInterfaceType.InterfaceIsIUnknown)]
    private interface IShellItem
    {
        [return: MarshalAs(UnmanagedType.IUnknown)]
        object BindToHandler(System.Runtime.InteropServices.ComTypes.IBindCtx pbc, [MarshalAs(UnmanagedType.LPStruct)] Guid bhid, [MarshalAs(UnmanagedType.LPStruct)] Guid riid);

        IShellItem GetParent();

        [return: MarshalAs(UnmanagedType.LPWStr)]
        string GetDisplayName(SIGDN sigdnName);

        // 2 other methods to be defined
    }

    [Guid("b63ea76d-1f85-456f-a19c-48159efa858b"), InterfaceType(ComInterfaceType.InterfaceIsIUnknown)]
    private interface IShellItemArray
    {
        void _VtblGap1_4(); // skip 4 methods

        int GetCount();
        IShellItem GetItemAt(int dwIndex);
    }

    private enum SIGDN
    {
        SIGDN_NORMALDISPLAY,
        SIGDN_PARENTRELATIVEPARSING,
        SIGDN_DESKTOPABSOLUTEPARSING,
        SIGDN_PARENTRELATIVEEDITING,
        SIGDN_DESKTOPABSOLUTEEDITING,
        SIGDN_FILESYSPATH,
        SIGDN_URL,
        SIGDN_PARENTRELATIVEFORADDRESSBAR,
        SIGDN_PARENTRELATIVE,
        SIGDN_PARENTRELATIVEFORUI
    }

    private enum SVGIO
    {
        SVGIO_BACKGROUND,
        SVGIO_SELECTION,
        SVGIO_ALLVIEW,
        SVGIO_CHECKED,
        SVGIO_TYPE_MASK,
        SVGIO_FLAG_VIEWORDER
    }
}

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