From: tonyblaha AT juno DOT com
To: djgpp AT delorie DOT com
Subject: modem help
Message-ID: <19981010.141012.7911.0.tonyblaha@juno.com>
X-Mailer: Juno 1.49
X-Juno-Line-Breaks: 12-26,28-41
Date: Sat, 10 Oct 1998 15:13:06 EDT
Reply-To: djgpp AT delorie DOT com

I've written the following program to send a string to the modem (COM2 on
my computer), but it only works some of the time. It compiles okay with
no errors, but doesn't work when I try to run it. But then if I use a
comm program like telix (for dos), then try to use the program, it works
fine _once_, but the next time I use it, it doesn't work again. The
program sends an "ATDT..." string to the modem followed by a "\r".
Afterwards, it lets you pick up the phone and press a key before it sends
another "\r" to the modem to cut it off. I've tried the program with and
without the "fflush(modem);" statements, and I've also tried to
initialize the modem with "fputs("ATZ\r", modem);", but none of the that
works. From the fact that it works one time after I use telix, I thought
that maybe it wasn't being initialized right, but as I've said, I tried
using "ATZ\r" which is the same init string telix uses... help?

#include <stdio.h>

int main() {

FILE *modem;

modem = fopen("COM2", "wb");

if(modem == NULL) {
  printf("ERROR\n");
  exit(0);
}

printf("Dialing 682-8151...\n\n");	/* the # for the local weather
recording */

fputs("ATDT 6828151\r", modem);
fflush(modem);

printf("Pick up phone and press any key...\n");
getch();
fputs("\r", modem);
fflush(modem);

fclose(modem);

}


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