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access NET SEND using C++

Posted on 2004-09-20
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Last Modified: 2010-04-01
Hello,

I am using windows 2000.
I want to write c++ program that use "NET" program with "SEND" command.
so far I success by using
system("NET SEND d213213 jashdjkhasjkd");

1)
but I need to get the error, and I can not do it maybe It can be done by getting the data from cerr
if so I want to take it char[], but I don't now elegant way to do this.

OR

2) API of NET SEND will help

Thanks in advance
Nir
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Question by:nir2002
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4 Comments
 
LVL 22

Expert Comment

by:grg99
ID: 12101525
A bit baroque, but you could wrap it in a batch file:

net send ... yadda...  1>ErrorFile   2>ErrorFile
echo %ErrorLevel% >>ErrorFile

0
 
LVL 48

Expert Comment

by:AlexFM
ID: 12101551
0
 
LVL 48

Expert Comment

by:AlexFM
ID: 12101574
This sample shows how to create process and programmatically read it's output. If NET returns meaningfull exit code, you can read it using GetExitCodeProcess function.
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LVL 86

Accepted Solution

by:
jkr earned 500 total points
ID: 12102036
Don't use 'net send', use the respective Win32 API 'NetMessageBufferSend()':

http://win32.mvps.org/network/nmbs.html

#include <windows.h>
#include <lm.h>
#include <stdio.h>
#include <stdlib.h>
#pragma hdrstop
#pragma comment( lib, "netapi32.lib" )



#define MAXLEN 256



void enum_names( const wchar_t *server );



int main( int argc, char *argv[] )
{
      DWORD rc;
      wchar_t server[MAXLEN], name[MAXLEN], from[MAXLEN], msg[MAXLEN];

      if ( argc != 5 && argc != 2 )
      {
            puts( "\nusage: nmbs \\\\server message-name from-name \"message\"" );
            puts( "       nmbs \\\\server\n" );
            puts( "First form: Sends the message to the <message-name> alias on <server>." );
            puts( "       Use whatever you like as <fromname>." );
            puts( "Second form: Lists <message-name>s on <server>. Note that not all of" );
            puts( "       them may work." );

            return 1;
      }

      mbstowcs( server, argv[1], MAXLEN );
      server[MAXLEN - 1] = L'\0';

      if ( argc == 2 )
      {
            enum_names( server );
      }
      else
      {
            mbstowcs( name, argv[2], MAXLEN );
            name[MAXLEN - 1] = L'\0';
            mbstowcs( from, argv[3], MAXLEN );
            from[MAXLEN - 1] = L'\0';
            mbstowcs( msg, argv[4], MAXLEN );
            msg[MAXLEN - 1] = L'\0';

            printf( "\nTrying ... " );
            rc = NetMessageBufferSend( server, name, from, (byte *) &msg[0], wcslen( msg ) * 2 );

            if ( rc != NERR_Success )
            {
                  printf( "NMBS() returned %lu\n", rc );
                  return 1;
            }

            puts( "Done." );
      }

      return 0;
}



void enum_names( const wchar_t *server )
{
      MSG_INFO_1 *buf, *cur;
      DWORD read, total, resumeh, rc, i;

      printf( "\nAvailable message-names on server %S:\n", server );
      resumeh = 0;
      do
      {
            buf = NULL;
            rc = NetMessageNameEnum( server, 1, (BYTE **) &buf,
                  512, &read, &total, &resumeh );
            if ( rc != ERROR_MORE_DATA && rc != ERROR_SUCCESS )
                  break;

            for ( i = 0, cur = buf; i < read; ++ i, ++ cur )
            {
                  // Note: the capital S in the format string will expect Unicode
                  // strings, as this is a program written/compiled for ANSI.
                  printf( "%S\n", cur->msgi1_name );
            }

            if ( buf != NULL )
                  NetApiBufferFree( buf );

      } while ( rc == ERROR_MORE_DATA );

      if ( rc != ERROR_SUCCESS )
            printf( "NMNE() returned %lu\n", rc );
}

Calling external programs to do the work is always the worst of two choices.

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