使用 WinAPI 获取文件夹的选定项目

Question

我尝试获取用户正在使用的文件夹的选定文件。我有以下代码已经在运行，但仅在桌面文件上：

private string selectedFiles()
{
    // get the handle of the desktop listview
    IntPtr vHandle = WinApiWrapper.FindWindow("Progman", "Program Manager");
    vHandle = WinApiWrapper.FindWindowEx(vHandle, IntPtr.Zero, "SHELLDLL_DefView", null);
    vHandle = WinApiWrapper.FindWindowEx(vHandle, IntPtr.Zero, "SysListView32", "FolderView");
    
    //IntPtr vHandle = WinApiWrapper.GetForegroundWindow();

    //Get total count of the icons on the desktop
    int vItemCount = WinApiWrapper.SendMessage(vHandle, WinApiWrapper.LVM_GETITEMCOUNT, 0, 0);
    //MessageBox.Show(vItemCount.ToString());
    uint vProcessId;
    WinApiWrapper.GetWindowThreadProcessId(vHandle, out vProcessId);
    IntPtr vProcess = WinApiWrapper.OpenProcess(WinApiWrapper.PROCESS_VM_OPERATION | WinApiWrapper.PROCESS_VM_READ |
    WinApiWrapper.PROCESS_VM_WRITE, false, vProcessId);
    IntPtr vPointer = WinApiWrapper.VirtualAllocEx(vProcess, IntPtr.Zero, 4096,
    WinApiWrapper.MEM_RESERVE | WinApiWrapper.MEM_COMMIT, WinApiWrapper.PAGE_READWRITE);
    try
    {
        for (int j = 0; j < vItemCount; j++)
        {
            byte[] vBuffer = new byte[256];
            WinApiWrapper.LVITEM[] vItem = new WinApiWrapper.LVITEM[1];
            vItem[0].mask = WinApiWrapper.LVIF_TEXT;
            vItem[0].iItem = j;
            vItem[0].iSubItem = 0;
            vItem[0].cchTextMax = vBuffer.Length;
            vItem[0].pszText = (IntPtr)((int)vPointer + Marshal.SizeOf(typeof(WinApiWrapper.LVITEM)));
            uint vNumberOfBytesRead = 0;
            WinApiWrapper.WriteProcessMemory(vProcess, vPointer,
            Marshal.UnsafeAddrOfPinnedArrayElement(vItem, 0),
            Marshal.SizeOf(typeof(WinApiWrapper.LVITEM)), ref vNumberOfBytesRead);
            WinApiWrapper.SendMessage(vHandle, WinApiWrapper.LVM_GETITEMW, j, vPointer.ToInt32());
            WinApiWrapper.ReadProcessMemory(vProcess,
            (IntPtr)((int)vPointer + Marshal.SizeOf(typeof(WinApiWrapper.LVITEM))),
            Marshal.UnsafeAddrOfPinnedArrayElement(vBuffer, 0),
            vBuffer.Length, ref vNumberOfBytesRead);
            string vText = Encoding.Unicode.GetString(vBuffer, 0,
            (int)vNumberOfBytesRead);
            string IconName = vText;

            //Check if item is selected
            var result = WinApiWrapper.SendMessage(vHandle, WinApiWrapper.LVM_GETITEMSTATE, j, (int)WinApiWrapper.LVIS_SELECTED);
            if (result == WinApiWrapper.LVIS_SELECTED)
            {
                return vText;
            }
        }
    }
    finally
    {
        WinApiWrapper.VirtualFreeEx(vProcess, vPointer, 0, WinApiWrapper.MEM_RELEASE);
        WinApiWrapper.CloseHandle(vProcess);
    }
    return String.Empty;
}

我尝试使用 GetForegroundWindow() 获取窗口句柄，然后调用 SHELLDLL_DefView 但没有成功。

那么如何更改前 3 行以获得当前使用的文件夹的句柄？

Answer 1

要完成各种 shell 对象和接口明确支持的事情需要进行大量的黑客工作。虽然文档并不容易发现，但功能是存在的。 Raymond Chen 写了一篇关于使用这些界面的精彩文章。似乎没有办法获取“当前”文件夹，但我想您可以获取 HWND 并查看是否有前台窗口。

Answer 2

非常感谢。你给了我正确的方向。可以获取文件夹中选定的文件：

/// <summary>
/// Get the selected file of the active window
/// </summary>
/// <param name="handle">Handle of active window</param>
/// <returns></returns>
public String getSelectedFileOfActiveWindow(Int32 handle)
{
    try
    {
        // Required ref: SHDocVw (Microsoft Internet Controls COM Object)
        ShellWindows shellWindows = new SHDocVw.ShellWindows();

        foreach (InternetExplorer window in shellWindows)
        {
            if (window.HWND == handle)
                return ((Shell32.IShellFolderViewDual2)window.Document).FocusedItem.Path;
        }                
    }
    catch (Exception)
    {
        return null;
    }
    return null;
}