chat.c

一个演示使用ipx协议在局域网来传递包的例子

/*============================================================================*/
/* Demo program that illustrates the use of IPX routines for transmitting     */
/* data across a network. This program allows a network-wide 'chat' to occur  */
/* by any and all users running this program. The chat conversation appears   */
/* in the top region of the screen. Each user is requested for a name or      */
/* 'handle' for them to be identified. Messages are typed at the foot of the  */
/* screen and transmitted across the network to all other users (including    */
/* yourself!) when you press the ENTER key. Coool stuff!                      */
/*                                                                            */
/* NB: The idea behind this demo was to illustrate the IPX routines. As for   */
/* the other code, it isn't guaranteed to be efficient. In fact, to try       */
/* and ensure compatability with most compilers I've done things the 'easy'   */
/* way which, as we know, isn't usually the best ;-) By all means take the    */
/* code and mod it if you feel the need to.                                   */
/*============================================================================*/

#include <stdio.h>
#include <stdlib.h>
#include <malloc.h>
#include <memory.h>
#include <dos.h>

typedef unsigned char   BYTE;
typedef unsigned short  WORD;
typedef unsigned long   DWORD;
typedef unsigned char   BOOL;

#define TRUE            1
#define FALSE           0

#define MY_SOCKET       0x869c

#include "ripx.h"

IPX_LOCAL_ADDRESS       myAddr;

#define MAX_LEN         80

/*  Our IPX Packet definition. It looks a little strange 'cos the header  */
/*  appears after the Event Control Block. This is okay though since the  */
/*  ECB is NOT actually transmitted across the network - only the header  */
/*  and the rest of our packet are. The ECB is only to interface with the */
/*  IPX driver. If you use this code and replace the definition of PACKET */
/*  with one of your own make sure that szString[] member is the one that */
/*  is replaced and that it is in the same order as below.                */

#pragma pack(1)
typedef struct tagPACKET
{
    IPX_ECB     ecb;
    IPX_HEADER  ipx;
    char        szString[MAX_LEN];
} PACKET;
#pragma pack()

PACKET      Tx, Rx;

void DoChat( WORD wSocket );

void main( void )
{
    int         nResult;
    WORD        wSocket;

    if ( !IPX_Available() )
    {
        printf( "IPX not set up/available!\n" );
        exit( 1 );
    }

    /*  What's this node's address?  */

    if ( IPX_GetLocalAddr(&myAddr) )
    {
        printf( "\n\nDiagnostic Info:\n\n" );
        printf( "net  Address = %04lX\n",myAddr.netAddr.dwAddr );
        printf( "node Address = %02X:%02X:%02X:%02X:%02X:%02X\n",
                                (unsigned int)myAddr.nodeAddr.cbAddr[0],
                                (unsigned int)myAddr.nodeAddr.cbAddr[1],
                                (unsigned int)myAddr.nodeAddr.cbAddr[2],
                                (unsigned int)myAddr.nodeAddr.cbAddr[3],
                                (unsigned int)myAddr.nodeAddr.cbAddr[4],
                                (unsigned int)myAddr.nodeAddr.cbAddr[5] );
    }
    else
    {
        printf( "IPX error getting local address!\n" );
    }

    /*  Try to open socket first  */

    wSocket=IPX_OpenSocket(FALSE,MY_SOCKET);
    if ( wSocket!=0xffff )
    {
        if ( !IPX_InitSendPacket(&Tx.ipx,&Tx.ecb,wSocket,sizeof(Tx.szString)) )
        {
            printf( "InitSendPacket failed!\n" );
        }
        if ( !IPX_InitReceivePacket(&Rx.ipx,&Rx.ecb,wSocket,sizeof(Rx.szString)) )
        {
            printf( "InitReceivePacket failed!\n" );
        }
        DoChat( wSocket );
        if ( !IPX_CloseSocket(wSocket) )
        {
            printf( "\n\nSocket close failed! Error=%04X\n",IPX_GetLastError() );
        }
        else
        {
            printf( "\n\nSocket closed okay!\n" );
            printf( "Demo coded by CyberFrog 8:)\n\n" );
        }
    }
    else
    {
        printf( "Error opening socket. Error=%04X\n",IPX_GetLastError() );
    }
}

int  Inkey( void )
{
    /*  Gets a key from system but only if there's one there...  */

    int   key=0;

    if ( kbhit() )
    {
        key=getch();
        if ( key==0 ) key=getch()+256;
    }
}

void SetPos( int x, int y )
{
    /*  Sets the position of the cursor on screen using BIOS  */

    union REGS      regs;

    regs.h.ah = 0x02;
    regs.h.bh = 0x00;
    regs.h.dl = (unsigned char)x;
    regs.h.dh = (unsigned char)y;
    int86( 0x10,&regs,&regs );
}

void ClearTop( void )
{
    /*  Clears the top 23 lines of the display  */

    int     i;

    for ( i=0; i<23; i++ )
    {
        SetPos(0,i);
        printf( "                                                                               " );
    }
}

void DrawScreen( void )
{
    /*  Does just what it says on the tin...  */

    ClearTop();
    SetPos( 0,23 );
    printf( "哪哪哪哪哪哪哪哪哪哪哪哪哪哪哪哪哪哪哪哪哪哪哪哪哪哪哪哪哪哪哪哪哪哪哪哪哪哪哪