Redirect stdout, stder in a GUI

From:

Vincent RICHOMME <richom.v@free.fr>

Newsgroups:

microsoft.public.vc.mfc

Date:

Sat, 17 Jun 2006 18:48:45 +0200

Message-ID:

<44943262$0$30333$626a54ce@news.free.fr>

Hi,

I am still trying to redirect stdout and stderr in my MFC app (GUI)
So I do this :

BOOL CDemo1App::InitInstance()
{
    // Redirect COnsole IO (stdin, stdout, stderr)

    m_consRedir.Init();
}

with consRedir a CConsoleRedirector object defined like this :

CConsoleRedirector::CConsoleRedirector()
{
    // Creation des events
   m_hEndThread = CreateEvent(0, TRUE, FALSE, 0);
   m_hWaitThread = CreateEvent(0, TRUE, FALSE, 0);

   m_hReadPipe = NULL;
   m_hWritePipe = NULL;
}

CConsoleRedirector::~CConsoleRedirector()
{

   ::SetEvent(m_hEndThread);

   ::WaitForSingleObject(m_hWaitThread, INFINITE);

   // Close handles
   ::CloseHandle(m_hEndThread);
   ::CloseHandle(m_hWaitThread);

   dup2(_open_osfhandle((long)GetStdHandle(STD_OUTPUT_HANDLE), _O_TEXT), 1);
}

UINT CConsoleRedirector::ThreadFunc(LPVOID pvParam)
{
    CConsoleRedirector *pThis = static_cast<CConsoleRedirector *>(pvParam);
    return pThis->ThreadFunc();

}
UINT CConsoleRedirector::ThreadFunc()
{
    BYTE Buffer[256] = {0};
    DWORD dwBytesRead = 0;
    DWORD dwTotalBytesAvail = 0;
    DWORD dwBytesLeftThisMessage = 0;

    while(true)
    {
     if(::WaitForSingleObject(m_hEndThread, 0) == WAIT_OBJECT_0)
    {
         ::SetEvent(m_hWaitThread);
         return 0;
    }

        // Code de traitement.
    if( (ReadFile(m_hReadPipe, Buffer, 256 , &dwBytesRead, NULL) ) &&
(dwBytesRead) ){
            AfxMessageBox( _T("HELLO WORLD") );
        }
    }
    return 0;
}

void CConsoleRedirector::Init()
{
    SECURITY_ATTRIBUTES saAttr;
    BOOL bInheritHandles = FALSE;
    int iRet = 0;

    //--- Create Pipe-----//
    ZeroMemory(&saAttr,sizeof(SECURITY_ATTRIBUTES) );
    saAttr.nLength = sizeof(SECURITY_ATTRIBUTES);
    saAttr.bInheritHandle = TRUE;
    saAttr.lpSecurityDescriptor = NULL;

    //--- Redirect stdout & stderr-----//
    if ( CreatePipe(&m_hReadPipe, &m_hWritePipe, &saAttr, 0) )
    {
       iRet = dup2(_open_osfhandle((long)m_hReadPipe, _O_TEXT), 2);
    }
    CloseHandle(m_hWritePipe);

    // cin, cout, cerr point to console as well
    std::ios::sync_with_stdio();

    // Start Watching thread
    if (iRet == 0)
    AfxBeginThread(ThreadFunc,this,THREAD_PRIORITY_NORMAL,0,0,NULL);
}

But it doesn't seem to work.

Any Idea ? I could also use AllocConsole but I don't want to see the
console.