这可能行不通，因为在IShellWindows中找不到这个弹窗

@_zhiqiu: 参考 How to get selected file(s)/folder(s) from Windows Explorer?

@dudu: 非常感谢您的回答，但是这个帖子中步骤还是要先获取IShellWindows。
我已经完在 explorer和桌面中完成了同样的功能（都是通过IShellWindows -> IDispath -> IShellBrowser -> IShellView）。
但是上面的流程在文件选择框中没有效果。

@dudu: 我现在准备换一种方式去实现，思路是分别找到搜索栏的窗口和文件名的窗口，然后获取起title，具体可以看下面的代码；但是我碰到一个问题，在spy++能看到文件名窗口的窗口标题但是在代码中获取不到

// 获取选中文件窗口的 Text
        let seleced_file_hwnd = unsafe {
            WindowsAndMessaging::FindWindowExW(fw_hwnd, None, w!("ComboBoxEx32"), None)
        };
        println!("seleced_file_hwnd: {:?}", seleced_file_hwnd);
        if seleced_file_hwnd.is_err() {
            return Ok(target_path);
        }
        let seleced_file_hwnd = seleced_file_hwnd.unwrap();
        let mut real_selected_file_hwnd: Option<HWND> = None;
        let _ = unsafe {
            WindowsAndMessaging::EnumChildWindows(seleced_file_hwnd, Some(Self::get_select_file_from_dialog_proc), LPARAM(&mut real_selected_file_hwnd as *const _ as _))
        };
        println!("real_selected_file_hwnd: {:?}", real_selected_file_hwnd);
        if real_selected_file_hwnd.is_none() {
            return Ok(target_path);
        }
        let real_selected_file_hwnd = real_selected_file_hwnd.unwrap();
        let seleced_file_title = win::get_window_text(real_selected_file_hwnd);
        println!("seleced_file_title: {:?}", seleced_file_title);

        // 获取搜索框的 Text
        let mut breadcrumb_parent_hwnd: Option<HWND> = None;
        let _ = unsafe {
            WindowsAndMessaging::EnumChildWindows(fw_hwnd, Some(Self::get_select_file_from_dialog_proc), LPARAM(&mut breadcrumb_parent_hwnd as *const _ as _))
        };
        if breadcrumb_parent_hwnd.is_none() {
            return Ok(target_path);
        }
        let breadcrumb_parent_hwnd = breadcrumb_parent_hwnd.unwrap();
        let breadcrumb_hwnd = unsafe {
            WindowsAndMessaging::FindWindowExW(breadcrumb_parent_hwnd, None, w!("ToolbarWindow32"), None)
        };
        if breadcrumb_hwnd.is_err() {
            return Ok(target_path);
        }
        let breadcrumb_hwnd = breadcrumb_hwnd.unwrap();
        let breadcrumb_title = win::get_window_text(breadcrumb_hwnd);
        println!("breadcrumb_title: {:?}", breadcrumb_title);

        target_path = format!("{}\\{}", breadcrumb_title, seleced_file_title);

@_zhiqiu: win::get_window_text 是怎么实现的？其他窗口可以获取到标题吗？

@dudu: 是的，其它窗口是正常的，比如上面代码中的 breadcrumb_title 可以正常获取。
下面是 win::get_window_text 的实现：

pub fn get_window_text(hwnd: HWND) -> String {
    let len = unsafe { WindowsAndMessaging::GetWindowTextLengthW(hwnd) + 1 };
    let mut buffer = vec![0u16; len as usize];
    let len = unsafe { WindowsAndMessaging::GetWindowTextW(hwnd, &mut buffer) };
    String::from_utf16_lossy(&buffer[0..len as usize])
}

@_zhiqiu: 建议确认一下是否是权限问题，参考 https://stackoverflow.com/a/54280690

@dudu: 感谢，我试试

@dudu:
这是窗口的层级结构，现在有 SHELLDLL_DefView, 可以通过 SHELLDLL_DefView 拿到 IUnknown/IDisaptch/IShellBrowser 吗？由于我对于 windows 相关的接口不是很了解。

我尝试了通过 WindowsAndMessaging::SendMessageW(defview, WindowsAndMessaging::RegisterWindowMessageW(w!("SHELL_IUnknown")), WPARAM(0), LPARAM(&mut unknown as *const _ as _)) 方式去获取却无法获取到。
麻烦您了。

@_zhiqiu: 参考 Open-Shell-Menu/Src/ClassicExplorer
/ExplorerBand.cpp