Setting up 'standard output device' for a MFC Thread

Casey E Mullen -- mullenc@battelle.org
Friday, May 31, 1996

     Environment:  VC 4.1, Powerstation Fortran 4 and Win95
     
     I am writing an application which calls Fortran for some heavy-duty 
     CFD calculations, and I would like to route Fortran's write(*,*) 
     output (which writes to the standard output device) to a CEditView.  I 
     have investigated using a Console window, but a CEditView would fit 
     better in the application. 
     
     The Fortran code and it's associated window will have its own thread.  
     I have not figured out how to get either the Console or CEditView to 
     work.  The write(*,*) statements don't cause an error, but I have no 
     idea where they are sending their output.  I think that I need to 
     hookup a "standard output device" for the thread when it is created, 
     but I don't know how.
     
     Any ideas?  If the calculation code were in C, where would output from 
     printf be sent?
     
     Danke sehr,
     Casey Mullen

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Deepak Saxena -- Deepak_Saxena@ccm.ch.intel.com
Monday, June 03, 1996

[Mini-digest: 4 responses]

Take a look at ::CreatePipe(), ::SetStdHandle(), and ::GetStdHandle()

Basically what you want to do is redirect stdout for your app into a pipe.  All 
output will be fed into the write end of the pipe.  Read the data from the other
end of the pipe and then display it in your CEditView.  You need to make sure 
you keep reading data out of the pipe as it is put into.  Otherwise your app. 
will deadlock!

Deepak

-----From: "Robertson David" 


     If your app is to only run on WinNT/Win95, you can create pipes and
     pass handles to the pipes in your call to CreateProcess. Output from
     the other application would then be redirected to the pipe, which you
     can read and display in your CEditView. This will not work on Win32s!

-----From: Vellore Gururaja Rao 

      If the calculation code were in C and u use printf functions,
      there are two functions attached below which might help.
      Instead of "COutWnd" make these functions global.
      Instead of "outlist" (for a list box ) make them point to u'r
      CEditView

Hope this helps,
Bye,
GURU.
##########
int printf(const char * format, ... )
{
	char msgbuf[BUFSIZ*2];
	char tmpbuf[BUFSIZ*2];
	const char *fmt;
	//FILE *fl ;
    FILE *x ;

	CListBox * lst = COutWnd :: outlist;
	va_list args;
	int returnVal, i, j ;

	
	va_start( args, format);
	(void) vsprintf( msgbuf, format, args );
	va_end( args );

	returnVal = strlen (msgbuf) ;

	COutWnd :: displayText(msgbuf, &currLnNo) ;

	return returnVal ;
}

void 
COutWnd :: displayText (char *msgbuf, int *crLnNo)
{

	char	tmpbuf[BUFSIZ];
	int		i, j ;

	CListBox * lst = COutWnd :: outlist;
	for (j = 0, i = 0 ; msgbuf[i] ; i++)
	{
		if(msgbuf[i] != '\n')
		{
			tmpbuf[j++] = msgbuf[i] ;
		}
		else
		{
			tmpbuf[j] = '\0' ;
			lst->SendMessage( LB_ADDSTRING, 0,(long)tmpbuf) ;
			lst->SendMessage( LB_SETTOPINDEX,*crLnNo, 0L) ;
			(*crLnNo)++ ;
			j = 0 ;
		}
	}

	if(i)
	{
		if(j > 1)
		{
			tmpbuf[j] = '\0' ;
			lst->SendMessage(LB_INSERTSTRING, *crLnNo,(long)tmpbuf) ;
			lst->SendMessage(LB_SETTOPINDEX, *crLnNo, 0L) ;
			(*crLnNo)++ ;
		}
	}
}
-----From: "Greg Tighe" 

Casey,
	I have had a similar experience - I needed to take some legacy C 
console apps and get them to run in a CEditView window.  What I did 
was in the main header file for all the C code I redefined printf, i.e.:

#define printf	my_CEditView_printf

Then I created a function:

extern "C" int my_CEditView_printf (const char *pszFormatString, ...)
{
// Do necessary formatting here...

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