C++ Newbie, Need Help!
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  1. #1
    Join Date
    Sep 2010
    Posts
    15

    C++ Newbie, Need Help!

    Hey Guys, So I am trying to implement a socket program that will allow me to transfer data from a machine and monitor it remotely. Having issues with a particular part of this program. I am a newb to programming and I would greatly appreciate any help. The error I get is:

    Unhandled exception at 0x0040196b in haas.exe: 0xC0000005: Access violation reading location 0x00000000.

    Call Stack:
    > haas.exe!main(int aArgc, char * * aArgv) Line 46 + 0x3 bytes C++
    msvcr100.dll!_initterm(void (void)* * pfbegin, void (void)* * pfend) Line 873 C

    Code:

    #include "internal.hpp"
    #include "haas_adapter.hpp"
    #include "server.hpp"
    #include "string_buffer.hpp"

    int main(int aArgc, char *aArgv[])
    {
    int port = 7878;
    int i = 1;
    bool debug = false;
    bool positions = false;

    while (aArgv[i][0] == '-' && aArgc > 0)
    {
    if (aArgv[i][1] == 'd')
    debug = true;
    else if (aArgv[i][1] == 'p')
    positions = true;
    else
    {
    printf("Invalid option: %s\n", aArgv[i]);
    printf("Usage: %s [-dp] <Serial_COM> [port]\n", aArgv[0]);
    exit(1);
    }

    i++;
    aArgc--;
    }

    if (aArgc > 2)
    port = atoi(aArgv[i + 1]);

    /* Construct the adapter and start the server */
    HaasSerial *serial = new HaasSerial(aArgv[i], 19200, "none", 7, 1, debug);
    HaasAdapter adapter(port, serial, positions);
    adapter.startServer();

    return 0;
    }

    The line of code where it points for the error is:
    while (aArgv[i][0] == '-' && aArgc > 0)

    I really need help getting this program to run ASAP. Thanks guys!

  2. #2
    Join Date
    Sep 2004
    Location
    Holland (land of the dope)
    Posts
    4,123

    Re: C++ Newbie, Need Help!

    Code:
    while (aArgv[i][0] == '-' && aArgc > 0)
    aArgc is the count of the elements in aArgv. First you get a element, and then you check if there are actually elements. The process always goes from left to right, so...
    Code:
    while (aArgc > 0 && aArgv[i][0] == '-')
    .. by switching the checks you first check if there are elements, and then use the elements.

    Code:
    int i = 1;
    Every arrays starts at 0, not at 1.
    Last edited by Skizmo; September 6th, 2010 at 01:20 PM.

  3. #3
    Join Date
    Sep 2010
    Posts
    15

    Re: C++ Newbie, Need Help!

    Thank you, I think that solved the problem. Can't believe I didn't see that

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