[Dev-C++] Modem Configuration

[Evandro H. R. <ero...@ro...>]

Hi people,

    I trying to produce a little program to configurate my external modem
(USR 56K).
    First I create a file with CreateFile() function, then I used
WriteFile() function to send the configuration strings to modem.
    For test I sent a string like "ATDT 9092" to put the modem to dial to
the number 9092, but the ligths on the modem blink but modem does not mak=
e
the call...
    Using HYPERTERMINAL, this work fine.
    What is wrong?
    I put the program below if someone can help me I will be grateful.

    Thanks in advance

--------------------------------------
Evandro H. Rodrigues
Ind=FAstrias ROMI S/A - Brazil
Quality Assurance Dep F14-07
Phone: 55-19-455-9529
Fax: 55-19-455-9084
email: ero...@ro...

---------- program -------------------------

#include <iostream>
#include <stdlib.h>
#include <stdio.h>
#include <windows.h>
#include <string>

int main(int argc, char *argv[])
{
  DCB dcb;
  HANDLE hCom;
  BOOL fSuccess;
  LPCVOID buffer;
  char *pcCommPort =3D "COM2";

  using namespace std;

  hCom =3D CreateFile( pcCommPort,
                     GENERIC_READ | GENERIC_WRITE,
                     0,    // comm devices must be opened w/exclusive-acc=
ess
                     NULL, // no security attributes
                     OPEN_EXISTING, // comm devices must use OPEN_EXISTIN=
G
                     0,    // not overlapped I/O
                     NULL  // hTemplate must be NULL for comm devices
                     );

  if (hCom =3D=3D INVALID_HANDLE_VALUE) {
      // Handle the error.
      printf ("CreateFile failed with error %d.\n", GetLastError());
      return (1);
    }

  // We will build on the current configuration, and skip setting the siz=
e
  // of the input and output buffers with SetupComm.

  fSuccess =3D GetCommState(hCom, &dcb);

  if (!fSuccess) {
      // Handle the error.
      printf ("GetCommState failed with error %d.\n", GetLastError());
      return (2);
    }

  // Fill in the DCB: baud=3D57,600 bps, 8 data bits, no parity, and 1 st=
op
bit.

  dcb.BaudRate =3D CBR_57600;     // set the baud rate
  dcb.ByteSize =3D 8;             // data size, xmit, and rcv
  dcb.Parity =3D NOPARITY;        // no parity bit
  dcb.StopBits =3D ONESTOPBIT;    // one stop bit

  fSuccess =3D SetCommState(hCom, &dcb);

  if (!fSuccess) {
      // Handle the error.
      printf ("SetCommState failed with error %d.\n", GetLastError());
      return (3);
    }

  string codigo =3D "ATDT 9092\n";
  DWORD nBytes;
  string lida =3D "1234567890123456789012345678901";

  if (WriteFile(hCom, &codigo, 10, &nBytes, NULL))
    cout << "Foram escritos " << nBytes << " Bytes" << endl;

  if (ReadFile(hCom, &lida, 10, &nBytes, NULL))
    cout << "String lida -> " << lida << " Bytes lidos " << nBytes << end=
l;

  system("PAUSE");
  return (0);
}