Send SMS using AT command in LabWindows?

Question

I managed to call..using the ATD command but now I am having problems in sending a SMS message..
In hyperterminal the commands are the following:
AT+CMGF=1 \r
AT+CMGW="0040766562692" \r
The GSM / GPRS modem will then return a prompt "> " and you can start typing the SMS text message.
>Have a nice day.
When finished, press Ctrl+z of the keyboard.
Here is what I tried to do...but nothing happens:
int commandSendSMS()
      char bW1[100];
      Fmt(bW1,"%s","AT+CMGF=1\r");
   ComWrt(4, bW1, 10);
   Fmt(bW1,"%s","AT+CMGW=\"0040766562692\"\r");
   ComWrt(4, bW1, 25);
   Fmt(bW1,"%s","Have a nice day.\032" );  
   ComWrt(4, bW1, 18);
      return 0;
I use \032 to replace <ctrl+z> is that correct?
What am I doing wrong...please help!

Answer 1

Ok, the situation seems to be a bit more clear now. Here what I would do, using GetInQLen and ComRd to test answers from the modem:
   char   bW1[64], msg[512];
   // Send first part of the commands
   strcpy (bW1, "AT+CMGF=1\r");
   ComWrt (4, bW1, strlen (bW1));
   Delay (0.1);
   strcpy (bW1, "AT+CMGW=\"0040766562692\"\r");
   ComWrt (4, bW1, strlen (bW1));
   Delay (0.1);
   // Test for answer from the modem
   ComRd (4, msg, GetInQLen (4));
   if (!strlen (msg) || strcmp (msg, "> ")) {
      MessagePopup ("Error", "No answer from the modem or incorrect answer!");
      goto Error;
   // Send SMS text to the modem
   strcpy (bW1, "Have a nice day.\032" );  
   ComWrt (4, bW1, strlen (bW1));
   Delay (0.1);
   // Test for answer from the modem
   ComRd (4, msg, GetInQLen (4));
   if (!strlen (msg) || strncmp (msg, "+CMGW", 5)) {
      MessagePopup ("Error", "No answer from the modem or incorrrect answer!");
      goto Error;
   // Find ref number and issue the command to actually send the message
   Scan (msg, "%s[dtzz]%d", &x);   // substitute 'zz' with ASCII code for ':'
   sprintf (bW1, "AT+CMSS=%d\r", x);
   ComWrt (4, bW1, strlen (bW1));
I wrote this code from memory: please double check and complete it before running it.
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