it works fine now:

Qt Code: 
  1. ServerMainWindow::ServerMainWindow(QWidget* parent, const char* name)
  2.   : MainWindowBase(parent, name),
  3.   m_server(0)
  4. {
  5.   m_clients.setAutoDelete(true);
  6.  
  7.  
  8.   proc    = new QProcess(this);
  9.  
  10.   proc->addArgument("ipconfig");
  11.   proc->addArgument("-all");
  12.  
  13.  
  14.   QObject::connect(proc,SIGNAL(readyReadStdout()),this,SLOT(readFromStdout()));
  15.   QObject::connect(m_start, SIGNAL(clicked()), this, SLOT(slotStartClicked()));
  16.   QObject::connect(m_stop, SIGNAL(clicked()), this, SLOT(slotStopClicked()));
  17.   proc->start();
  18. }
  19.  
  20. ////////////////////////////////////////////////////////////////////////////////
  21.  
  22.       void ServerMainWindow::readFromStdout(){
  23.       //      QByteArray data = proc->readStdout();   
  24.            QString data = proc->readStdout();   
  25.       textEdit1->setText(data);
  26.             sendToClients(data);
  27.         } 
  28. ////////////////////////////////////////////////////////////////////////////////
  29.  
  30. ServerMainWindow::~ServerMainWindow()
  31. {
  32.   slotStopClicked();
  33. }
  34.  
  35. ////////////////////////////////////////////////////////////////////////////////
  36.  
  37. void ServerMainWindow::sendToClients(const QString& text)
  38. {
  39.   if (text.isNull()) return;
  40.  
  41.  
  42.   // iterate over all clients and send them the text
  43.   QPtrDictIterator<Client> iter(m_clients);
  44.   for (; iter.current() != 0; ++iter)
  45.   {
  46.     QSocket* sock = iter.current()->socket();
  47.     QTextStream stream(sock);
  48.     stream << text;
  49.   }
  50. }
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but still my client doesn't recive stdout from ipconfig
function sendToClients(data); should send QString to void ServerMainWindow::sendToClients(const QString& text)

is the function sendToClients(const QString& text) correct? or could be there some issue in the client application?

client function that recieves data from server app is:
Qt Code: 
  1. void ClientMainWindow::slotRead()
  2. {
  3.   QString text;
  4.   while (m_socket->canReadLine())
  5.     text += m_socket->readLine();
  6.  
  7.   if (!text.isNull())
  8.     appendText(text, Output);
  9. }
  10.  
  11.  
  12. where 
  13.  
  14.  
  15.  
  16. void ClientMainWindow::appendText(const QString& text, Mode mode)
  17. {
  18.   switch (mode)
  19.   {
  20.     case System:
  21.       m_textEdit->setColor(Qt::blue);
  22.       break;
  23.  
  24.     case Error:
  25.       m_textEdit->setColor(Qt::red);
  26.       break;
  27.  
  28.     default:
  29.       m_textEdit->setColor(Qt::black);
  30.       break;
  31.   }
  32.  
  33.   m_textEdit->append(text);
  34. }
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