QProcess cmd

I am learning how to use QProcess to communicate with cmd.exe on WinXP. I wrote the following code, to send and receive messages and commands from my app to cmd.exe. This is a console application, not useful at all I know. I just wrote the simplier code possible to show you the error:

Code:

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#include <QByteArray>
#include <QProcess>
#include <iostream>
#include <string>
 
using namespace std;
 
int main(int argc,char** argv)
{
    QProcess cmd;
    cmd.start("cmd");
    if (!cmd.waitForStarted())
        return false;
    cmd.waitForReadyRead();
    QByteArray result = cmd.readAll();
    cout << result.data();
 
    string str;
    getline(cin,str);
    while(str != string("exit"))
    {
        cmd.write(str.c_str());
        cmd.write("\n");
        cmd.waitForReadyRead();
        result = cmd.readAll();
        cout << result.data();
        getline(cin,str);
    }
}

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Everything works well, except that the commands I send are delayed. For instance:

1) I launch my console application, this appears:

Quote:

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Microsoft Windows XP [version 5.1.2600]
(C) Copyright 1985-2001 Microsoft Corp.

[path_to_my_current_dir]>

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2) I write "help" then press enter. Now the prompt looks like that:

Quote:

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Microsoft Windows XP [version 5.1.2600]
(C) Copyright 1985-2001 Microsoft Corp.

[path_to_my_current_dir]>
help

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3) Then I press enter again, and my prompt displays:

Quote:

---

Microsoft Windows XP [version 5.1.2600]
(C) Copyright 1985-2001 Microsoft Corp.

[path_to_my_current_dir]>
help
Pour plus d'informations sur une commande spécifique, entrez le nom de la commande HELP.
ASSOC Affiche ou modifie les applications associées aux extensions de...

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It prints the cmd help, but only when I press enter twice. I can't figure out why there is this delay.

When I press enter my program is at the line 24 and wait to be able to read the cmd.exe output (cmd.waitForReadyRead();). When it is possible, result takes this output and prints it to my console application. I don't understand why result prints "help" and not the actual help of cmd.

Thanks in advance I hope I was clear ;)

Oh my bad! Sorry in fact I just have to wait to cmd to send the help content without press enter again. I was just too hurry.

But I still can't see why the word that I type (here the word "help") reapears below:

Quote:

---

Microsoft Windows XP [version 5.1.2600]
(C) Copyright 1985-2001 Microsoft Corp.

[path_to_my_current_dir]>
help

---

It's better with a picture:
I type "help" on the white line and after it looks like that:
http://www.enregistrersous.com/image...0331114602.jpg

The green QTextEdit only receive data with the function cmd.readAll(); cmd is a QProcess. So it shouldn't receive the word "help" but only the help content that follows.