QProcess not communicating with .net framework > 3.5

[SimpleIsBetter]

Hi all,

I have a main Qt application, launching a C# app with QProcess.
I would like to communicate with the C# app using the QProcess tools, the standard channels.
Although the communication is working perfectly when I compile the C# app with .net framework 3.5, I am not receiving any data from the process when it is compiled with .net 4.0 or 4.5

I posted a thread on the msdn forums : https://social.msdn.microsoft.com/Fo...=csharpgeneral

I have made a minimal console example to replicate the issue:

#include <QCoreApplication>
#include <QProcess>
#include <iostream>
#include <string>
using namespace std;
 
int main(int argc, char *argv[])
{
    QCoreApplication a(argc, argv);
 
    // Path to the C# executable
    QString program = "D:/Documents/ConsoleApplication1/ConsoleApplication1/bin/Release/ConsoleApplication1.exe";
 
    // Start child Process
    QProcess * process = new QProcess();
       process->setProgram(program);
       // Execute lambda function whenever a message from the process is received
       QObject::connect(process, &QProcess::readyReadStandardOutput, [&](){ cout << process->readAll().toStdString(); } );
       process->start();
 
    string text;
    cin >> text;
    process->write( QByteArray::fromStdString(text) + "\r\n" );
 
    return a.exec();
}

#include <QCoreApplication>
#include <QProcess>
#include <iostream>
#include <string>
using namespace std;

int main(int argc, char *argv[])
{
    QCoreApplication a(argc, argv);

    // Path to the C# executable
    QString program = "D:/Documents/ConsoleApplication1/ConsoleApplication1/bin/Release/ConsoleApplication1.exe";

    // Start child Process
    QProcess * process = new QProcess();
       process->setProgram(program);
       // Execute lambda function whenever a message from the process is received
       QObject::connect(process, &QProcess::readyReadStandardOutput, [&](){ cout << process->readAll().toStdString(); } );
       process->start();

    string text;
    cin >> text;
    process->write( QByteArray::fromStdString(text) + "\r\n" );

    return a.exec();
}

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and a minimal C# example :

namespace ConsoleApplication1
{
    class Program
    {
        static void Main(string[] args)
        {
            string text;
            while (true)
            {
                Console.WriteLine("0");
                text = Console.ReadLine();               
                Console.WriteLine("1");
                Console.WriteLine(text);
            }
        }
    }
}

namespace ConsoleApplication1
{
    class Program
    {
        static void Main(string[] args)
        {
            string text;
            while (true)
            {
                Console.WriteLine("0");
                text = Console.ReadLine();               
                Console.WriteLine("1");
                Console.WriteLine(text);
            }
        }
    }
}

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I am using Qt 5.4.1 on windows 7, and compiling with msvc 2010 32 bits.

Thanks in advance for your help