Go Premium for a chance to win a PS4. Enter to Win

x
?
Solved

Threads in a console app

Posted on 1998-05-23
1
Medium Priority
?
312 Views
Last Modified: 2013-11-20
How does one "fork" a new process using MFC in a console app? I know the call is AfxStartThread(), but all the examples I can find are Windows based!!! Code sample would be greatly appreciated.

andy t.
0
Comment
Question by:tudhopea
1 Comment
 
LVL 32

Accepted Solution

by:
jhance earned 100 total points
ID: 1314484
The Windows Win32 API doesn't provide fork() so you can't do it that way.  Use the C-runtime function _beginthread().  On it's man page in the SDK documentation, you will find the following example:

/* BEGTHRD.C illustrates multiple threads using functions: *
 *      _beginthread            _endthread * *
 * This program requires the multithreaded library. For example,
 * compile with the following command line: *     CL /MT /D "_X86_" BEGTHRD.C *
 * If you are using the Visual C++ development environment, select the
 * Multi-Threaded runtime library in the compiler Project Settings
 * dialog box. *  */#include <windows.h>
#include <process.h>    /* _beginthread, _endthread */#include <stddef.h>
#include <stdlib.h>#include <conio.h>void Bounce( void *ch );
void CheckKey( void *dummy );
/* GetRandom returns a random integer between min and max. */
#define GetRandom( min, max ) ((rand() % (int)(((max) + 1) - (min))) + (min))
BOOL repeat = TRUE;     /* Global repeat flag and video variable */
HANDLE hStdOut;         /* Handle for console window */
CONSOLE_SCREEN_BUFFER_INFO csbi;    /* Console information structure */
void main(){    CHAR    ch = 'A';
    hStdOut = GetStdHandle( STD_OUTPUT_HANDLE );
    /* Get display screen's text row and column information. */
   GetConsoleScreenBufferInfo( hStdOut, &csbi );
    /* Launch CheckKey thread to check for terminating keystroke. */
    _beginthread( CheckKey, 0, NULL );
    /* Loop until CheckKey terminates program. */    while( repeat )    {
        /* On first loops, launch character threads. */
        _beginthread( Bounce, 0, (void *) (ch++)  );
        /* Wait one second between loops. */        Sleep( 1000L );    }}
/* CheckKey - Thread to wait for a keystroke, then clear repeat flag. */
void CheckKey( void *dummy ){    _getch();
    repeat = 0;    /* _endthread implied */}
/* Bounce - Thread to create and and control a colored letter that moves
 * around on the screen. * * Params: ch - the letter to be moved */
void Bounce( void *ch ){
    /* Generate letter and color attribute from thread argument. */
    char    blankcell = 0x20;    char    blockcell = (char) ch;
    BOOL    first = TRUE;   COORD   oldcoord, newcoord;   DWORD   result;
    /* Seed random number generator and get initial location. */
    srand( _threadid );    newcoord.X = GetRandom( 0, csbi.dwSize.X - 1 );
    newcoord.Y = GetRandom( 0, csbi.dwSize.Y - 1 );    while( repeat )    {
        /* Pause between loops. */        Sleep( 100L );
        /* Blank out our old position on the screen, and draw new letter. */
        if( first )            first = FALSE;        else
         WriteConsoleOutputCharacter( hStdOut, &blankcell, 1, oldcoord, &result );
         WriteConsoleOutputCharacter( hStdOut, &blockcell, 1, newcoord, &result );
        /* Increment the coordinate for next placement of the block. */
        oldcoord.X = newcoord.X;        oldcoord.Y = newcoord.Y;
        newcoord.X += GetRandom( -1, 1 );
        newcoord.Y += GetRandom( -1, 1 );
        /* Correct placement (and beep) if about to go off the screen. */
        if( newcoord.X < 0 )            newcoord.X = 1;
        else if( newcoord.X == csbi.dwSize.X )
            newcoord.X = csbi.dwSize.X - 2;        else if( newcoord.Y < 0 )
            newcoord.Y = 1;        else if( newcoord.Y == csbi.dwSize.Y )
            newcoord.Y = csbi.dwSize.Y - 2;
        /* If not at a screen border, continue, otherwise beep. */        else
            continue;        Beep( ((char) ch - 'A') * 100, 175 );    }
    /* _endthread given to terminate */    _endthread();}
0

Featured Post

Technology Partners: We Want Your Opinion!

We value your feedback.

Take our survey and automatically be enter to win anyone of the following:
Yeti Cooler, Amazon eGift Card, and Movie eGift Card!

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

Introduction: Dynamic window placements and drawing on a form, simple usage of windows registry as a storage place for information. Continuing from the first article about sudoku.  There we have designed the application and put a lot of user int…
Introduction: Load and Save to file, Document-View interaction inside the SDI. Continuing from the second article about sudoku.   Open the project in visual studio. From the class view select CSudokuDoc and double click to open the header …
This video will show you how to get GIT to work in Eclipse.   It will walk you through how to install the EGit plugin in eclipse and how to checkout an existing repository.
Integration Management Part 2
Suggested Courses

885 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question