Multiple NetSends

This is a discussion on Multiple NetSends within the C++ Programming forums, part of the General Programming Boards category; Hi everyone. I would like a little help with this code I'm working on. It's purpose is to ask the ...

  1. #1
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    Multiple NetSends

    Hi everyone. I would like a little help with this code I'm working on. It's purpose is to ask the user for a computer's IP, a message to be sent, and number of messages. Then it will net send that computer the supplied amount of messages.
    The problem I'm having is with this:
    Code:
    void sendmsg (string a, string b)
    {
    system("net send a b");
    }
    How would I make the console understand that a and b are variables. Here is all the code.
    Code:
    #include <iostream>
    #include <stdio.h>
    #include <windows.h>
    #include <string.h>
    using namespace std;
    
    void sendmsg (string a, string b)
    {
    system("net send a b");
    }
    
    int main(void)
    {
    string ipaddr;
    string msg;
    int nummsg;
    char cnfrm [1];
    int n = 0;
    
    cout << "Enter Computer Name or IP:\n ";
    cin >> ipaddr;
    cout << "Enter Message:\n ";
    cin >> msg;
    cout << "Enter Number of Messages to be Sent:\n ";
    cin >> nummsg;
    cout << "Press y to send the message or n to quit:\n ";
    cin >> cnfrm;
    
    if (cnfrm == "y") {
        while (n < nummsg) {
            sendmsg (ipaddr, msg);
            }
        }
    else 
        {
        exit(0);
        }
        
    return 0;
    }
    There are probablly a ton of mistakes, but I am definitely a beginner in C++.
    Thank you.

  2. #2
    C++ Developer XSquared's Avatar
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    You'd use sprintf() to print to the string, and then call system() with it. Or you could use stringstreams, but those I'm not familiar with.
    Naturally I didn't feel inspired enough to read all the links for you, since I already slaved away for long hours under a blistering sun pressing the search button after typing four whole words! - Quzah

    You. Fetch me my copy of the Wall Street Journal. You two, fight to the death - Stewie

  3. #3
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    Here is a quick example of using stringstreams
    Code:
    #include <iostream>
    #include <sstream>
    
    int main()
    {
    	std::stringstream stream;
    	std::string aString = "This is a string!";
    	int number=10;
    	stream << "Here is a string: " << aString << " And here is a number: " << number;
    	std::cout << stream.str() << std::endl;
    }
    To reset the content of the string you would just do this (at least this is how I do it):
    Code:
    stream.str("");
    stream.clear();
    And finally, to get a char array from the stream you do this:
    Code:
    stream.str().c_str();

  4. #4
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    If you were writing the string to the screen, functions like printf would allow you to just write something like %d in your string, telling it there was a variable there, and you would then list all the variables in order after your string. System however, does not format your string for you. You need to make a string, and there are functions that do that for you (as mentioned above), and then pass that string to system().

  5. #5
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    Thank you for all the help. I'm trying to do this with string streams thanks to ya'lls advise and I've almost got it. This is a pretty basic question, but how would I make theur be spaces in between each word in this code:
    Code:
    std::stringstream stream;
    std::string ipaddr = "xxx.xxx.xxx.xxx";
    std::string message = "hello";
    stream << "net send" << ipaddr << message;
    That outputs:
    net sendxxx.xxx.xxx.xxxhello

    The desired output is:
    net send xxx.xxx.xxx.xxx hello

    Basically, I want to add spaces.

    My other question is how could I use std::cin (or whatever else I should use) to store input as a string.
    For instance, what would I have to do to assign the variable ipaddr whatever the user inputs.
    Code:
    std::string ipaddr;

  6. #6
    carry on JaWiB's Avatar
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    try:
    Code:
    stream<<"net send "<<ipaddr<<' '<<message;
    (notice the space after "send")

    And for input you should be able to do:
    Code:
    std::cin>>ipaddr;
    "Think not but that I know these things; or think
    I know them not: not therefore am I short
    Of knowing what I ought."
    -John Milton, Paradise Regained (1671)

    "Work hard and it might happen."
    -XSquared

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    Thanks. Seems to be working. Now I just have to piece stuff together. Thanks everyone.
    EDIT: Damn. One more thing.
    Code:
    stream << "net send " << ipaddr << ' '<< msg;
    std::system("stream");
    How do I get system to understand that stream is a stream and that it should not actually try to run the DOS command "stream" which doesnt exist. I get an error if I try without the quotes or with ' 's. Any ideas?
    Last edited by zach0616; 08-18-2004 at 09:17 PM.

  8. #8
    carry on JaWiB's Avatar
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    Quote Originally Posted by Shakti
    Here is a quick example of using stringstreams
    And finally, to get a char array from the stream you do this:
    Code:
    stream.str().c_str();


    Edit: Uhh weird...If i edit it I have to have at least 4 characters (besides the quote)
    "Think not but that I know these things; or think
    I know them not: not therefore am I short
    Of knowing what I ought."
    -John Milton, Paradise Regained (1671)

    "Work hard and it might happen."
    -XSquared

  9. #9
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    Maybe I'm just dense or something.
    Here's part of the code.
    Code:
    stream << "net send " << ipaddr << ' '<< msg;
    stream.str().c_str();
    
    system ("PAUSE");
    while (n < nummsg) {
            std::system(stream);
            n++;
    }
    When I do it like that, I get the error "invalid conversion from `void*' to `const char*' ". When I put quotes around stream it compiles, but like I said in the other post, doesn't work correctly. Any ideas what I'm doing wrong? Sorry to bug everyone with questions.

  10. #10
    Yes, my avatar is stolen anonytmouse's Avatar
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    stream.str().c_str() will return a 'const char*' that you can pass to std::system.
    Code:
            std::system(stream.str().c_str());
    - or -
    Code:
            const char* mystr = stream.str().c_str();
            std::system(mystr);

  11. #11
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    Ok thanks. Everything works fine except the string msg will only hold the first word of your message. Can strings not hold space?

  12. #12
    C++ Developer XSquared's Avatar
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    You need to use getline() in order to capture spaces.
    Naturally I didn't feel inspired enough to read all the links for you, since I already slaved away for long hours under a blistering sun pressing the search button after typing four whole words! - Quzah

    You. Fetch me my copy of the Wall Street Journal. You two, fight to the death - Stewie

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