Question

Rust 代码是

use std::process::Command;

fn main() {
    if cfg!(target_os = "windows") {
        Command::new("cls").spawn().expect("cls command failed to start");
    } else {
        println!("Not windows");
    }
}

错误是

PS C:\dev\Rust\testing> cargo run
   Compiling testing v0.1.0 (C:\dev\Rust\testing)
    Finished dev [unoptimized + debuginfo] target(s) in 0.95s
     Running `target\debug\testing.exe`
thread 'main' panicked at 'cls command failed to start: Os { code: 2, kind: NotFound, message: "The system cannot find the file 
specified." }', src\main.rs:5:37
note: run with `RUST_BACKTRACE=1` environment variable to display a backtrace
error: process didn't exit successfully: `target\debug\testing.exe` (exit code: 101)

使用 RUST_BACKTRACE="full"：

PS C:\dev\Rust\testing> cargo run
   Compiling testing v0.1.0 (C:\dev\Rust\testing)
    Finished dev [unoptimized + debuginfo] target(s) in 1.12s
     Running `target\debug\testing.exe`
thread 'main' panicked at 'cls command failed to start: Os { code: 2, kind: NotFound, message: "The system cannot find the file specified." }', src\main.rs:5:37
stack backtrace:
   0:     0x7ff7c9ecf059 - std::backtrace_rs::backtrace::dbghelp::trace
                               at /rustc/7eac88abb2e57e752f3302f02be5f3ce3d7adfb4\/library\std\src\..\..\backtrace\src\backtrace\dbghelp.rs:98
   1:     0x7ff7c9ecf059 - std::backtrace_rs::backtrace::trace_unsynchronized
                               at /rustc/7eac88abb2e57e752f3302f02be5f3ce3d7adfb4\/library\std\src\..\..\backtrace\src\backtrace\mod.rs:66
   2:     0x7ff7c9ecf059 - std::sys_common::backtrace::_print_fmt
                               at /rustc/7eac88abb2e57e752f3302f02be5f3ce3d7adfb4\/library\std\src\sys_common\backtrace.rs:79
   3:     0x7ff7c9ecf059 - std::sys_common::backtrace::_print::{{impl}}::fmt
                               at /rustc/7eac88abb2e57e752f3302f02be5f3ce3d7adfb4\/library\std\src\sys_common\backtrace.rs:58
   4:     0x7ff7c9ee32fb - core::fmt::write
                               at /rustc/7eac88abb2e57e752f3302f02be5f3ce3d7adfb4\/library\core\src\fmt\mod.rs:1080
   5:     0x7ff7c9ecc598 - std::io::Write::write_fmt<std::sys::windows::stdio::Stderr>
                               at /rustc/7eac88abb2e57e752f3302f02be5f3ce3d7adfb4\/library\std\src\io\mod.rs:1516
   6:     0x7ff7c9ed1ae4 - std::sys_common::backtrace::_print
                               at /rustc/7eac88abb2e57e752f3302f02be5f3ce3d7adfb4\/library\std\src\sys_common\backtrace.rs:61
   7:     0x7ff7c9ed1ae4 - std::sys_common::backtrace::print
                               at /rustc/7eac88abb2e57e752f3302f02be5f3ce3d7adfb4\/library\std\src\sys_common\backtrace.rs:48
   8:     0x7ff7c9ed1ae4 - std::panicking::default_hook::{{closure}}
                               at /rustc/7eac88abb2e57e752f3302f02be5f3ce3d7adfb4\/library\std\src\panicking.rs:208
   9:     0x7ff7c9ed16c8 - std::panicking::default_hook
                               at /rustc/7eac88abb2e57e752f3302f02be5f3ce3d7adfb4\/library\std\src\panicking.rs:227
  10:     0x7ff7c9ed239f - std::panicking::rust_panic_with_hook
                               at /rustc/7eac88abb2e57e752f3302f02be5f3ce3d7adfb4\/library\std\src\panicking.rs:577
  11:     0x7ff7c9ed1f05 - std::panicking::begin_panic_handler::{{closure}}
                               at /rustc/7eac88abb2e57e752f3302f02be5f3ce3d7adfb4\/library\std\src\panicking.rs:484
  12:     0x7ff7c9ecf93f - std::sys_common::backtrace::__rust_end_short_backtrace<closure-0,!>
                               at /rustc/7eac88abb2e57e752f3302f02be5f3ce3d7adfb4\/library\std\src\sys_common\backtrace.rs:153
  13:     0x7ff7c9ed1eb9 - std::panicking::begin_panic_handler
                               at /rustc/7eac88abb2e57e752f3302f02be5f3ce3d7adfb4\/library\std\src\panicking.rs:483
  14:     0x7ff7c9ee2590 - core::panicking::panic_fmt
                               at /rustc/7eac88abb2e57e752f3302f02be5f3ce3d7adfb4\/library\core\src\panicking.rs:85
  15:     0x7ff7c9ee23b3 - core::option::expect_none_failed
                               at /rustc/7eac88abb2e57e752f3302f02be5f3ce3d7adfb4\/library\core\src\option.rs:1234
  16:     0x7ff7c9ec11c8 - core::result::Result<std::process::Child, std::io::error::Error>::expect<std::process::Child,std::io::error::Error>
                               at C:\Users\sadic\.rustup\toolchains\stable-x86_64-pc-windows-msvc\lib\rustlib\src\rust\library\core\src\result.rs:933
  17:     0x7ff7c9ec5f8f - testing::main
                               at C:\dev\Rust\testing\src\main.rs:5
  18:     0x7ff7c9ec31eb - core::ops::function::FnOnce::call_once<fn(),tuple<>>
                               at C:\Users\sadic\.rustup\toolchains\stable-x86_64-pc-windows-msvc\lib\rustlib\src\rust\library\core\src\ops\function.rs:227
  19:     0x7ff7c9ec1d7b - std::sys_common::backtrace::__rust_begin_short_backtrace<fn(),tuple<>>
                               at C:\Users\sadic\.rustup\toolchains\stable-x86_64-pc-windows-msvc\lib\rustlib\src\rust\library\std\src\sys_common\backtrace.rs:137
  20:     0x7ff7c9ec40e1 - std::rt::lang_start::{{closure}}<tuple<>>
                               at C:\Users\sadic\.rustup\toolchains\stable-x86_64-pc-windows-msvc\lib\rustlib\src\rust\library\std\src\rt.rs:66
  21:     0x7ff7c9ed25a3 - core::ops::function::impls::{{impl}}::call_once
                               at /rustc/7eac88abb2e57e752f3302f02be5f3ce3d7adfb4\library\core\src\ops\function.rs:280
  22:     0x7ff7c9ed25a3 - std::panicking::try::do_call
                               at /rustc/7eac88abb2e57e752f3302f02be5f3ce3d7adfb4\/library\std\src\panicking.rs:381
  23:     0x7ff7c9ed25a3 - std::panicking::try
                               at /rustc/7eac88abb2e57e752f3302f02be5f3ce3d7adfb4\/library\std\src\panicking.rs:345
  24:     0x7ff7c9ed25a3 - std::panic::catch_unwind
                               at /rustc/7eac88abb2e57e752f3302f02be5f3ce3d7adfb4\/library\std\src\panic.rs:382
  25:     0x7ff7c9ed25a3 - std::rt::lang_start_internal
                               at /rustc/7eac88abb2e57e752f3302f02be5f3ce3d7adfb4\/library\std\src\rt.rs:51
  26:     0x7ff7c9ec40b3 - std::rt::lang_start<tuple<>>
                               at C:\Users\sadic\.rustup\toolchains\stable-x86_64-pc-windows-msvc\lib\rustlib\src\rust\library\std\src\rt.rs:65
  27:     0x7ff7c9ec6000 - main
  28:     0x7ff7c9ee76c8 - invoke_main
                               at d:\agent\_work\63\s\src\vctools\crt\vcstartup\src\startup\exe_common.inl:78
  29:     0x7ff7c9ee76c8 - __scrt_common_main_seh
                               at d:\agent\_work\63\s\src\vctools\crt\vcstartup\src\startup\exe_common.inl:288
  30:     0x7ffef5167034 - BaseThreadInitThunk
  31:     0x7ffef617d0d1 - RtlUserThreadStart
error: process didn't exit successfully: `target\debug\testing.exe` (exit code: 101)

相比之下，我有一个 C++ 源文件，成功地做了同样的事情

#include <stdlib.h>

int main() {
    system("cls");
}

我使用来自 rustup.rs 的 rustup_init.exe 安装了 rustup，并且我每晚使用货物来运行程序，稳定分支也做同样的事情，如果有帮助的话，我还安装了 mingw64 和 llvm。我在互联网上没有发现任何人有同样的问题。那么，这是怎么回事，我该怎么做才能解决这个问题？

Answer 1

它不起作用的原因是因为 cls 不是 Windows 上的可执行文件，它是 Windows 命令行解释器的命令。

所以如果你想执行它，你必须执行cmd /c cls。

Command::new("cmd")
    .args(&["/c", "cls"])
    .spawn()
    .expect("cls command failed to start")
    .wait()
    .expect("failed to wait");

或者，如果您只想清除屏幕，也可以使用 console crate。

// console = "0.14.0"
let term = console::Term::stdout();
term.clear_screen().expect("failed clearing screen");

无法在 Windows 中运行系统命令

1 个答案: