Accessing program's own stdout/stderr

[TemporalBeing]

I have a program where I am porting some old DOS code, and wrapping it in a Qt application.
The problem I have is that the DOS code makes extensive use of writing to stdout and stderr for its data, and I want to capture it all and put it into a QTextEdit.

I've noticed there is some functionality for this kind of thing _when_ running a child process via QProcess.

I came across a couple suggestions, but they are relatively old - one referred to KProcess, but that was a 1998 post, and the second suggested using QSocketNotifier somehow.

I tried using the QSocketNotifier, but I never get any notices even though I know data has been written via printf(). Here's how I setup the access:

if (stdErrorReader == NULL)
		{
		stdErrorReader = new QFile(this);
		if (stdErrorReader != NULL)
			{
			stdErrorReader->open(2,QIODevice::ReadOnly|QIODevice::Text);
			connect(stdErrorReader,SIGNAL(readyRead()),this,SLOT(stdErrorDataAvailable()));
			if (stdErrorNotifier == NULL)
				{
				stdErrorNotifier = new QSocketNotifier(2,QSocketNotifier::Read,this);
				if (stdErrorNotifier != NULL)
					{
					connect(stdErrorNotifier,SIGNAL(activated(int)),this,SLOT(stdErrorDataAvailable(int)));
					}
				}
			}
		}
	if (stdOutReader == NULL)
		{
		stdOutReader = new QFile(this);
		if (stdOutReader != NULL)
			{
			stdOutReader->open(1,QIODevice::ReadOnly|QIODevice::Text);
			connect(stdOutReader,SIGNAL(readyRead()),this,SLOT(stdOutDataAvailable()));
			if (stdOutNotifier == NULL)
				{
				stdOutNotifier = new QSocketNotifier(1,QSocketNotifier::Read,this);
				if (stdOutNotifier != NULL)
					{
					connect(stdOutNotifier,SIGNAL(activated(int)),this,SLOT(stdOutDataAvailable(int)));
					}
				}
			}
		}

if (stdErrorReader == NULL)
		{
		stdErrorReader = new QFile(this);
		if (stdErrorReader != NULL)
			{
			stdErrorReader->open(2,QIODevice::ReadOnly|QIODevice::Text);
			connect(stdErrorReader,SIGNAL(readyRead()),this,SLOT(stdErrorDataAvailable()));
			if (stdErrorNotifier == NULL)
				{
				stdErrorNotifier = new QSocketNotifier(2,QSocketNotifier::Read,this);
				if (stdErrorNotifier != NULL)
					{
					connect(stdErrorNotifier,SIGNAL(activated(int)),this,SLOT(stdErrorDataAvailable(int)));
					}
				}
			}
		}
	if (stdOutReader == NULL)
		{
		stdOutReader = new QFile(this);
		if (stdOutReader != NULL)
			{
			stdOutReader->open(1,QIODevice::ReadOnly|QIODevice::Text);
			connect(stdOutReader,SIGNAL(readyRead()),this,SLOT(stdOutDataAvailable()));
			if (stdOutNotifier == NULL)
				{
				stdOutNotifier = new QSocketNotifier(1,QSocketNotifier::Read,this);
				if (stdOutNotifier != NULL)
					{
					connect(stdOutNotifier,SIGNAL(activated(int)),this,SLOT(stdOutDataAvailable(int)));
					}
				}
			}
		}

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The 'stdOutDataAvailable(int)' and 'stdOutDataAvailable()' slots never get called.

What am I doing wrong?


Is there a way to access the Application's QProcess() class so that I can use the methodology via QProcess?