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Using system ("net send ...")

scuzz1
scuzz1 asked
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Last Modified: 2010-04-15
I inherited a Access DB that uses a bunch of .bat files that net sends all the users of this DB when it needs repaired and when it is back up. I would like to consolidate these into a c prog. that reads from a list of users instead. I'm having problems getting the message into a string variable and then sending it.

does anyone know how to do this?

Thanks in advance.

Jim
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Kent OlsenData Warehouse / Database Architect
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Commented:
Hi scuzz1,

There are several problem areas here concerning strings.  In a logical sense, you're really going to have to build several strings.  Here are the basic steps that you'll need to take:

1.  Build the string the you want to send.
2.  Encapsulate it with quotes.
3.  Append the string after the "net " command string.
    The result will be 'net "some message"'.
4.  Convert the embedded double quotes to backslash double-quote.

The resulting string will look like "net \"some message\"".

If the string that you're going to send has embedded quotes, you'll need to perform another round of conversion on the quotes.

Kent

Author

Commented:
Hi Kent,

I have all the messages I need pasted together into string vars (including the "net send" command) I was trying to use it like this

  system ( varname )

Can I do it like that?
Kent OlsenData Warehouse / Database Architect
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Commented:
Hi scuzz1,

Sure.  The code should resemble this:


  char Message[1000];
  char *Text = "Send This";

  strcpy (Message, "net ");
  strcat (Message, "\"");
  strcat (Message, Text);
  strcat (Message, "\"");

  system (Message);


Kent
Data Warehouse / Database Architect
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Commented:
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Author

Commented:
I think the strcat (message, "\""); is what I'm looking for. I'll try it and get back to you.
Hi shouldn't u insert a * i.e
net send * message

Avik.
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Top Expert 2006

Commented:
you can combine all these statements into a single snprintf and it is safer too

sprintf ( message, 1000, " net send %s", send_this );

you can read the string send_this from the user at run time

system (message );
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Top Expert 2006

Commented:
grrr ... I recommend snprintf and write down a sprintf

snprintf ( message, 1000, " net send %s %s", receiver, send_this );
 ^                                                   ^^    
Hi,
if i remember correctly,the syntax of net send was:
 net send terminal number "message"
e.g. net send 4-33 "hello world"

char str[1000];
char term[100];

char msg[100];
strcpy(msg,"Repair needed etc....");

for(i=0;i<limit;i++)
{
strcpy(str,"net send ");
strcat(str,term); //where term stores the terminal number
strcat(str,"\"");
strcat(str,msg);//where msg stores the message which is the same for all users.
strcat(str,"\"");
system(str);
//change the terminal number for the next terminal in the string term
//if ur terminal numbers are just normal integer type numbers,use an integer
//keep incrementing them and use the itoa() function to convert them into string
//or as u said,u can store them in a double dimensional array of char(but that would take
//more space if the number of terminals is large).In that case,use term[i] where term[][] is where u store the terminal number
}

U said that u stored the entire command in strings.
the message is common to everyone so the only thing that changes in the command is the terminal number,just store those in a char[][] array and if they are numbers in some order
u can also use integers and the itoa() function
Kent OlsenData Warehouse / Database Architect
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Commented:
Hi Sunny,

The "wild" card in all of this is special characters.  That's why I suggested that the poster contain the data to be sent in quotes.

net send <destination> S t r i n g  w i t h  d o u b l e  s p a c i n g

Works only when the message is quoted.  And of course, any time that the string contains embedded quotes, the string must be converted to pass them properly.


Sure would be easier in *nix, huh?  A simple script would do all of the heavy lifting and keep the poster from having to maintain another program.  :)

Kent
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Top Expert 2006

Commented:
Hi Kent,

You are right ... *nix is far more suitable for this kind of stuff ...
Perhaps the reason why programmer's prefer it ... or is it too addictive ;o)

Commented:

Which OS is this running on?  You could construct your 'net send' using the Windows API, however, that would require much more effort then just calling the 'system' function with your 'net send'.

Mark

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