将 tchar 数组打印为 unicode 字符串 rust winapi

Question

我正在使用 winapi 获取系统上当前进程的列表运行，这是我的代码：

use winapi::um::tlhelp32::{Process32Next, Process32First, CreateToolhelp32Snapshot, TH32CS_SNAPPROCESS, PROCESSENTRY32};
use winapi::um::winnt::HANDLE;
use winapi::um::handleapi::CloseHandle;
use std::mem::size_of;

...

fn get_processes() {
    let h_process_snap: HANDLE;
    // really, rust?
    let mut pe32 = &mut PROCESSENTRY32{
        dwSize: 0,
        cntUsage: 0,
        th32ProcessID: 0,
        th32DefaultHeapID: 0,
        th32ModuleID: 0,
        cntThreads: 0,
        th32ParentProcessID: 0,
        pcPriClassBase: 0,
        dwFlags: 0,
        szExeFile: [0; 260],
    };

    unsafe {
        h_process_snap = CreateToolhelp32Snapshot(TH32CS_SNAPPROCESS, 0);
    }

    pe32.dwSize = size_of::<PROCESSENTRY32>() as u32;

    unsafe {
        if Process32First(h_process_snap, pe32) == 0 {
            CloseHandle(h_process_snap);
            println!("can't get a process snapshot");
            // TODO: return
        }

        while Process32Next(h_process_snap, pe32) != 0 {
            println!("{:?}", pe32.szExeFile);
        }
    }
}

...

现在我正在尝试打印进程的实际名称，在 C++ 中，这可以使用 cout or wcout 来完成。

当我使用 println!("{:?}", pe32.szExeFile); 时，这是我得到的：

[115, 117, 112, 101, 114, 102, 52, 45, 114, 117, 115, 116, 46, 101, 120, 101, 0, 116, 46, 101, 120, 101, 0, 98, 108, 101, 83, 104, 101, 108, 108, 46, 69, 120, 112, 101, 114, 105, 101, 110, 99, 101, 115, 46, 84, 101, 120, 116, 73, 110, 112, 117, 116, 46, 73, 110, 112, 117, 116, 65, 112, 112, 46, 101, 120, 101, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0]

我不太明白如何使用它，如何在 Rust 中将 pe32.szExeFile 打印为 Unicode 字符串？

另请参阅：https://docs.rs/winapi/0.3.6/winapi/um/tlhelp32/struct.PROCESSENTRY32.html

Answer 1

您的数组看起来像一个可以表示为 [u8;260] 的数组。这告诉我您可以使用 as:

将每个元素转换为其字符表示

fn main() {
    let some_string: [u8; 260] = [115, 117, 112, 101, 114, 102, 52, 45, 114, 117, 115, 116, 46, 101, 120, 101, 0, 116, 46, 101, 120, 101, 0, 98, 108, 101, 83, 104, 101, 108, 108, 46, 69, 120, 112, 101, 114, 105, 101, 110, 99, 101, 115, 46, 84, 101, 120, 116, 73, 110, 112, 117, 116, 46, 73, 110, 112, 117, 116, 65, 112, 112, 46, 101, 120, 101, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0];
    
    // Represent each u8 from some_string as a char in readable_string
    let readable_string: [char;260] = some_string.map(|x| x as char);
    
    for c in readable_string.iter().enumerate() {
        let (i, val): (usize, &char) = c;
        
        // Note that some characters are '\u{0}', which could be substituted
        // with a space
        match val {
            '\u{0}' => print!(" "),
            _ => print!("{}", val)
        };
    }
}

以上产生以下输出：

superf4-rust.exe t.exe bleShell.Experiences.TextInput.InputApp.exe

这是你想要做的吗？

Answer 2

感谢@IInspectable，我使用了明确的 Unicode 版本，例如Process32FirstW, and from_wide 以可读格式打印值：

let os_string = OsString::from_wide(&pe32.szExeFile[..]);
// ExeFile names have a lot of trailing 0's, remove them...
let exe_files: String = os_string.into_string().unwrap().replace("\u{0}", "");
println!("{:?}", exe_files);

将 tchar 数组打印为 unicode 字符串 rust winapi

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