DOS/Windows interaction

I need a nice code sample for writing and reading from a DOS window. What I'm trying to do is open a dos console program, send characters to it, and read its output as it's printed. Preferred language is Visual Basic, but C++ is okay too. Please feel free to use Win32 API calls. Thanks.
Matt Nicholson
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1. Incorporate the following code to your project.
2. Call RedirectIOToConsole() at initialization.
3. Use "fprintf(stdout, ...)", fprintf(stdin, ...)", "<<", or ">>" to do your input/output to that DOS window.
#include "stdafx.h"
#include "GuiCon.h"

#ifdef _DEBUG
#define new DEBUG_NEW
#undef THIS_FILE
static char THIS_FILE[] = __FILE__;

//using namespace std;

// Maximum number of lines the output console should have.
static const WORD MAX_CONSOLE_LINES = 500;


void RedirectIOToConsole()
    int                         hConHandle;
    long                        hStdHandle;
    FILE                        *fp;

    // Allocate a console for this application.

    // Set the screen buffer to be big enough to let us scroll text.
    GetConsoleScreenBufferInfo(GetStdHandle(STD_OUTPUT_HANDLE), &conInfo);
    conInfo.dwSize.Y = MAX_CONSOLE_LINES;
    SetConsoleScreenBufferSize(GetStdHandle(STD_OUTPUT_HANDLE), conInfo.dwSize);

    // Redirect unbuffered STDOUT to the console.
    hStdHandle = (long)GetStdHandle(STD_OUTPUT_HANDLE);
    hConHandle = _open_osfhandle(hStdHandle, _O_TEXT);
    fp = _fdopen( hConHandle, "w" );
    *stdout = *fp;
    setvbuf( stdout, NULL, _IONBF, 0 );

    // Redirect unbuffered STDIN to the console.
    hStdHandle = (long)GetStdHandle(STD_INPUT_HANDLE);
    hConHandle = _open_osfhandle(hStdHandle, _O_TEXT);
    fp = _fdopen( hConHandle, "r" );
    *stdin = *fp;
    setvbuf( stdin, NULL, _IONBF, 0 );

    // Redirect unbuffered STDERR to the console.
    hStdHandle = (long)GetStdHandle(STD_ERROR_HANDLE);
    hConHandle = _open_osfhandle(hStdHandle, _O_TEXT);
    fp = _fdopen( hConHandle, "w" );
    *stderr = *fp;
    setvbuf( stderr, NULL, _IONBF, 0 );

    // Make cout, wout, cin, wcin, wcerr, cerr, wclog, and clog
    // point to console as well.
//    ios::sync_with_stdio();


// End of File
mnicholsAuthor Commented:
Okay, thanks for the code. Now, can anyone help me translate this into code usable in Visual Basic? Unfortunately, I'm writing a Visual Basic program that requires this functionality. The only reason why I accepted C++ was that usually I can translate it over to VB if it just consists of Win32 API calls.
I'm not too familiar with VB, but the Win32 API's should be the same as defined in "WINCON.H" header file.
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Just in case you wonder what's my "GuiCon.h", here it is:
#ifndef _GUICON_H
#define _GUICON_H

#include <windows.h>
#include <wincon.h>
#include <stdio.h>
#include <fcntl.h>
#include <io.h>

#include <iostream.h>
#include <fstream.h>

void RedirectIOToConsole();


// End of File
mnicholsAuthor Commented:
See, I understand your C++ code quite well. However, Visual Basic doesn't have a standard out or in. it's not like you define an input and output source to print to (be it a console, the printer, a file, etc). so like you get the standard input and output handles, but it's not like you can attach it to good ole cout and cin.
You can't translate that directly in Visual Basic, like setvbuf() is a runtime C librairie, and good luck to write that in VB.

  The best is to compile that piece of code in a DLL and use it directly in VB, like any other DLL call.

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All that code and no points.  tsk, tsk...  :-(
if it makes you feel any better tflai, i think you gave the right answer, especially since C++ was ok too
mnicholsAuthor Commented:
just wanted to close it on up. sorry, tflai thanks for the code, but i'd only accept it if it were usable to me. unfortunately i can't just insert the raw c++ code into a VB program. i was just hoping i could translate, but i can't.-- Matt
I have been looking for something like this, myself.
I found a workable solution, in VB, at:

Check it out!
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