Printing tchar array as unicode string rust winapi-CodePudding

I'm using the winapi to grab a list of the current processes running on the system, here's my code:

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);
        }
    }
}

...

Now I'm trying to print the actual name of the process, in C , this can be done using cout or wcout.

When I use println!("{:?}", pe32.szExeFile);, this is what I get:

[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]

I don't really understand how to work with this, how can I print the pe32.szExeFile as a Unicode string in rust?

CodePudding user response：

Thanks to @IInspectable, I used the explicit Unicode versions, e.g. Process32FirstW, and from_wide to print the values in readable format:

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);

CodePudding user response：

The array you have looks like an array that can be represented as [u8;260]. That tells me that you can convert each element into its character representation by using as:

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)
        };
    }
}

The above produces the following output:

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

Is this what you're trying to do?