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Sending commands to stdin and sending end of transmit (Ctrl+D)


Sending commands to stdin and sending end of transmit (Ctrl+D)

By : jflorencio
Date : October 17 2020, 11:12 AM
seems to work fine You need to write append "\x04", with a backslah (\)
For more information, see the documentation (String Escape Sequences section)
code :


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How do I know how much time I should wait for PrintDialog after sending Commands to Print(to press "Ctrl+P" bu

How do I know how much time I should wait for PrintDialog after sending Commands to Print(to press "Ctrl+P" bu


By : user3355614
Date : March 29 2020, 07:55 AM
To fix the issue you can do I would have a maximum wait of a few seconds, but during that time I would periodically use the Win32 function FindWindowEx to see if the print dialog actually came up, and if so proceed. You can get a process' main window with code like this:
code :
Process[] processes = Process.GetProcessesByName(appName);
foreach (Process p in processes)
{
     IntPtr pFoundWindow = p.MainWindowHandle;
}
[DllImport("user32.dll", SetLastError = true)]
static extern IntPtr FindWindowEx(IntPtr hwndParent, IntPtr hwndChildAfter, string lpszClass, string lpszWindow);

[DllImport("user32.dll", SetLastError = true)]
public static extern IntPtr FindWindowEx(IntPtr parentHandle, IntPtr childAfter, string className,  IntPtr windowTitle);
/// <summary>
/// Wait for a child window of an application to appear
/// </summary>
/// <param name="appName">Application name to check (will check all instances)</param>
/// <param name="childWindowName">Name of child window to look for (titlebar)</param>
/// <param name="timeout">Maximum time, in milliseconds, to wait</param>
/// <returns>True if the window was found; false if it wasn't.</returns>
public static bool WaitForChildWindow(string appName, string childWindowName, int timeout)
{
    int sleepTime = timeout;
    while (sleepTime > 0)
    {
        Process[] processes = Process.GetProcessesByName(appName);
        foreach (Process p in processes)
        {
            IntPtr pMainWindow = p.MainWindowHandle;
            IntPtr pFoundWindow = FindWindowEx(pMainWindow, IntPtr.Zero, null, childWindowName);
            if (pFoundWindow != IntPtr.Zero)
                return true;
        }
        Thread.Sleep(100);
        sleepTime -= 100;
    }

    // Timed out!
    return false;
}
[DllImport("user32.dll", SetLastError = true)]
static extern uint GetWindowThreadProcessId(IntPtr hwnd, IntPtr processId);
[DllImport("user32.dll")]
[return: MarshalAs(UnmanagedType.Bool)]
static extern bool EnumThreadWindows(uint dwThreadId, EnumThreadDelegate lpfn, IntPtr lParam);
[DllImport("user32", SetLastError = true, CharSet = CharSet.Auto)]
private extern static int GetWindowText(IntPtr hWnd, StringBuilder text, int maxCount);

public delegate bool EnumThreadDelegate(IntPtr hwnd, IntPtr lParam);

static bool EnumThreadCallback(IntPtr hWnd, IntPtr lParam)
{
    StringBuilder text = new StringBuilder(500);
    GetWindowText(hWnd, text, 500);
    if (text.ToString() == "Print")
        return false;
    return true;
}

public static bool FindThreadPrintWindow(uint threadId)
{
    return !EnumThreadWindows(threadId, EnumThreadCallback, IntPtr.Zero);
}

public static bool WaitForOwnedPrintWindow(string appName, int timeout)
{
    int sleepTime = timeout;
    while (sleepTime > 0)
    {
        Process[] processes = Process.GetProcessesByName(appName);
        foreach (Process p in processes)
        {
            IntPtr pMainWindow = p.MainWindowHandle;
            uint threadId = GetWindowThreadProcessId(pMainWindow, IntPtr.Zero);
            if (FindThreadPrintWindow(threadId))
                return true;
        }
        Thread.Sleep(100);
        sleepTime -= 100;
    }

    // Timed out!
    return false;
}
Sending Ctrl+K Ctrk+U does not work, Ctrl+K Ctrl+C does

Sending Ctrl+K Ctrk+U does not work, Ctrl+K Ctrl+C does


By : Bruno Destro
Date : March 29 2020, 07:55 AM
may help you . I think that if you put a return after each Wheelcommand it will work. Now it will continue with the next command (undoing your initial command).
code :
;+++++ ALT + ScrollUp +++++
!WheelUp::
;##### SQL MANAGEMENT STUDIO #####
IfWinActive, Microsoft SQL Server Management Studio
{
    Send, {Control Down}ku{Control Up}
}
Return

;+++++ ALT + ScrollDown +++++
!WheelDown::
;##### SQL MANAGEMENT STUDIO #####
IfWinActive, Microsoft SQL Server Management Studio
{
    Send, {Control Down}kc{Control Up}
}
Return
Sending commands to stdin from a Python subprocess, even when stdin is not a terminal?

Sending commands to stdin from a Python subprocess, even when stdin is not a terminal?


By : manish kumar
Date : March 29 2020, 07:55 AM
fixed the issue. Will look into that further It's not that Python isn't treating stdin like a terminal; if stdin is a terminal, Python is likely treating it as such. But the subprocess's stdin may not be. In the second case, it definitely isn't a terminal, since you are explicitly using a pipe instead.
You probably won't be able to make stty treat a pipe as a terminal, short of changing the way it works. But that probably isn't what you want to do, anyway.
Xively: sending commands to devices - how to mark commands as read?

Xively: sending commands to devices - how to mark commands as read?


By : Nitish Kumar
Date : March 29 2020, 07:55 AM
it helps some times This all depends on your implementation and hardware choices. And the real answer to this question lays far beyond the scope of Xively. You say that the device has no storage of its own, but I assume it has some kind of volatile memory at the very least.
The best thing to do would be to store the timestamp of the last datapoint that was received and compare it to whatever current data you have. If the timestamp is greater than the one in memory then you know it is new data.
Send SIGINT to a process by sending ctrl-c to stdin

Send SIGINT to a process by sending ctrl-c to stdin


By : Cristian Garcia
Date : March 29 2020, 07:55 AM
With these it helps After a lot of research I figured out it's not too much work to do the pty fork myself. There's pty-rs, but it has bugs and seems unmaintained.
The following code needs pty module of nix which is not yet on crates.io, so Cargo.toml needs this for now:
code :
[dependencies]
nix = {git = "https://github.com/nix-rust/nix.git"}
extern crate nix;

use std::path::Path;
use nix::pty::{posix_openpt, grantpt, unlockpt, ptsname};
use nix::fcntl::{O_RDWR, open};
use nix::sys::stat;
use nix::unistd::{fork, ForkResult, setsid, dup2};
use nix::libc::{STDIN_FILENO, STDOUT_FILENO, STDERR_FILENO};
use std::os::unix::io::{AsRawFd, FromRawFd};
use std::io::prelude::*;
use std::io::{BufReader, LineWriter};


fn run() -> std::io::Result<()> {
    // Open a new PTY master
    let master_fd = posix_openpt(O_RDWR)?;

    // Allow a slave to be generated for it
    grantpt(&master_fd)?;
    unlockpt(&master_fd)?;

    // Get the name of the slave
    let slave_name = ptsname(&master_fd)?;

    match fork() {
        Ok(ForkResult::Child) => {
            setsid()?; // create new session with child as session leader
            let slave_fd = open(Path::new(&slave_name), O_RDWR, stat::Mode::empty())?;

            // assign stdin, stdout, stderr to the tty, just like a terminal does
            dup2(slave_fd, STDIN_FILENO)?;
            dup2(slave_fd, STDOUT_FILENO)?;
            dup2(slave_fd, STDERR_FILENO)?;
            std::process::Command::new("cat").status()?;
        }
        Ok(ForkResult::Parent { child: _ }) => {
            let f = unsafe { std::fs::File::from_raw_fd(master_fd.as_raw_fd()) };
            let mut reader = BufReader::new(&f);
            let mut writer = LineWriter::new(&f);

            writer.write_all(b"hello world\n")?;
            let mut s = String::new();
            reader.read_line(&mut s)?; // what we just wrote in
            reader.read_line(&mut s)?; // what cat wrote out
            writer.write(&[3])?; // send ^C
            writer.flush()?;
            let mut buf = [0; 2]; // needs bytewise read as ^C has no newline
            reader.read(&mut buf)?;
            s += &String::from_utf8_lossy(&buf).to_string();
            println!("{}", s);
            println!("cat exit code: {:?}", wait::wait()?); // make sure cat really exited
        }
        Err(_) => println!("error"),
    }
    Ok(())
}

fn main() {
    run().expect("could not execute command");
}
hello world
hello world
^C
cat exit code: Signaled(2906, SIGINT, false)
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