MFC: concurrent display of console output on GUI edit box.

I want to develop an application in MFC which could start a lengthy
console process and give its output concurrently on a text area of
32bit windows application.
I used pipes, but it display the output only after the process has
terminated. I tried _popen, it works for console based application,
but not compatible with win32 application.
I AM FACING THE PROBLEM THAT OUTPUT IS DISPLAYED ONLY AFTER CONSOLE
PROCESS ENDS.
Is there any way I could do this.. Here's my code. Thanks in advance.

void CAppMgr_BackupsDlg::ExecuteExternalFile(CString csExeName,
CString csArguments)
{

CString csExecute;
csExecute=csExeName + " " + csArguments;

SECURITY_ATTRIBUTES secattr;
ZeroMemory(&secattr,sizeof(secattr));
secattr.nLength = sizeof(secattr);
secattr.bInheritHandle = TRUE;

HANDLE rPipe, wPipe;

//Create pipes to write and read data
CreatePipe(&rPipe,&wPipe,&secattr,0);

STARTUPINFO sInfo;
ZeroMemory(&sInfo,sizeof(sInfo));
PROCESS_INFORMATION pInfo;
ZeroMemory(&pInfo,sizeof(pInfo));
sInfo.cb=sizeof(sInfo);
sInfo.dwFlags=STARTF_USESTDHANDLES;
sInfo.hStdInput=NULL;
sInfo.hStdOutput=wPipe;
sInfo.hStdError=wPipe;
char command[1024];
strcpy(command, csExecute.GetBuffer(csExecute.GetLength()));

//Create the process here.
CreateProcess(0, command,0,0,TRUE,
      NORMAL_PRIORITY_CLASS|CREATE_NO_WINDOW,0,0,&sInfo,&pInfo);
CloseHandle(wPipe);

//now read the output pipe here.
char buf[100];
DWORD reDword;
CString m_csOutput,csTemp;
BOOL res;
do
{
    res=::ReadFile(rPipe,buf,100,&reDword,0);
    csTemp=buf;
    m_csOutput=csTemp.Left(reDword);
            DisplayToTextArea(m_csOutput);
}
while(res);
}