Cannot read QProcess output for some applications

[yagabey]

Hi,
I am trying to read console output of a qt console app from a qt gui app.

void MainWindow::on_pushButton_clicked()
{
    proc= new QProcess(this);
    connect(proc,SIGNAL(readyReadStandardOutput()),this,SLOT(readProcessOutput()));
    proc->setProcessChannelMode(QProcess::MergedChannels);
    proc->start("C:\\Users\\yg\\Documents\\processtest\\debug\\deployFiles.bat");
}
void MainWindow::readProcessOutput()
{
    ui->textEdit->append(proc->readAllStandardOutput());
}

void MainWindow::on_pushButton_clicked()
{
    proc= new QProcess(this);
    connect(proc,SIGNAL(readyReadStandardOutput()),this,SLOT(readProcessOutput()));
    proc->setProcessChannelMode(QProcess::MergedChannels);
    proc->start("C:\\Users\\yg\\Documents\\processtest\\debug\\deployFiles.bat");
}
void MainWindow::readProcessOutput()
{
    ui->textEdit->append(proc->readAllStandardOutput());
}

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I can read the output for "deployFiles.bat" app. But when i change the file to :

proc->start("C:\\Users\\yg\\Documents\\processtest\\debug\\DriverModbus.exe");

proc->start("C:\\Users\\yg\\Documents\\processtest\\debug\\DriverModbus.exe");

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Nothing comes to standartoutput.
DriverModbus is a qt console app that uses qDebug() s to print data on its console.

https://dl.dropboxusercontent.com/u/...iverModbus.rar

What maybe the problem?

Thanks in advance...