如何将Windows API C字符串指针转换为字符串？

Question

我正在尝试使用

获取所有窗口的名称。

• winapi
  • EnumWindows
    • EnumWindowsProc
  • GetWindowText

extern crate winapi;

// --- std ---
use std::ffi::CStr;
// --- external ---
use winapi::{
    shared::{minwindef::LPARAM, windef::HWND__},
    um::winuser::{EnumWindows, GetWindowTextA},
};

fn find_window() {
    extern "system" fn enum_windows_proc(hwnd: *mut HWND__, _l_param: LPARAM) -> i32 {
        let ptr = &mut 0;

        unsafe {
            GetWindowTextA(hwnd, ptr as *mut i8, 1024);
            println!("hwnd: {:?}, name: {:?}", hwnd, CStr::from_ptr(ptr));
        }

        1
    }

    unsafe {
        EnumWindows(Some(enum_windows_proc), 0);
    }
}

fn main() {
    find_window();
}

我找到了一些解决方案：

• What is the proper way to go from a String to a *const i8?

• How do I convert a C string into a Rust string and back via FFI?

但是我得到这样的东西：

hwnd: 0x100d6, name: ""
hwnd: 0x10250, name: "B \xa3\xd6T\xf7\x7f\x00\x00\x03\x00\x00\x00"
hwnd: 0x10260, name: ""
hwnd: 0x1028a, name: "N \xa3\xd6T\xf7\x7f\x00\x00\x03\x00\x00\x00\x00"
hwnd: 0x10288, name: ""
hwnd: 0x706f8, name: "T \xa3\xd6T\xf7\x7f"
hwnd: 0x1011c, name: ""
hwnd: 0x10510, name: "W \xa3\xd6T\xf7"
hwnd: 0x2037c, name: ""
hwnd: 0x30742, name: "C \xa3\xd6T\xf7\x7f\x00\x00\x03\x00\x00\x00\x00\x00"
hwnd: 0x12019c, name: "M \xa3\xd6T\xf7\x7f\x00\x00\x03\x00\x00\x00\x00"
hwnd: 0x90754, name: "C \xa3\xd6T\xf7\x7f\x00\x00\x03\x00\x00\x00\x00\x00"
hwnd: 0x1004e4, name: "M \xa3\xd6T\xf7\x7f\x00\x00\x03\x00\x00\x00\x00"

很显然，所有名称都是错误的。 如何从ptr中获取字符串？